I 1. A. Bharathi et al. / International Journal of Pharma Sciences and Research (IJPSR) aqueous. found to. as Gibbs free. inorganic.

Transcription

1 THERMODYNAMICS AND ISOTHERMS ANALYSESS ON THE REMOVAL OF METHYLENEE BLUE DYE USING ACTIVATED NANO-POROUS CARBON A. BHARATHI 1 AND * S. ARIVOLI 1 PG and Rsarch Dpartmntt of Chmistry,Thiru.Vi. Ka. Govt. Arts Collg, Tiruvarur, Tamilnadu. *Author for corrspondnc: . arivu6363@gmail.com ABSTRACT - This analytical papr aimd to valuat th rmoval of Mthyln Blu dys from aquous solution by using plant matrial from Cassia Auriculata. Batch adsorption studiss wr carrid out by obsrving th ffct of xprimntal paramtrs such as ph, contact tim, initial concntration of th adsorbat, adsorbnt dosag and tmpratur. Adsorption kintic dataa wr tstd using psudo-scond- found to ordr, Elovich modl and intra particl diffusion modls. Th prsnt xprimntal data wr follow th Langmuir, Frundlich, Tmkin, Dubinin-Radushkvich, Hurkins-Jura, Halsy, Radlich- nrgy Ptrson, Jovanovich and BET isothrm modls. Thrmodynamic paramtrs such as Gibbs fr chang ( G 0 ), nthalpy chang ( H 0 ) and ntropy chang ( S 0 ) wr invstigatd. Th study confirmd that rmoval of Mthyln Blu dy using activatd Cassia Auriculata is found to b favourabl and hnc it could b usd as an adsorbnt for th tratmnt of fflunts from various dy industris. KEYWORDS: Adsorption, Activatd Cassia Auriculata Nano Carbon (ACANC), Mthyln Blu dy, Kintic modls, Isothrm modls and Thrmodynamic Studis. 1. INTRODUCTION: Nowadays th rmoval of dys from wastwatrs of various industris lik txtils, plastics, papr, lathr and food tc., ar causing srious nvironmntal problms. This wast watr containsaa non - biodgradabl inorganic and organic matrial, surfactants, psticids and som organic compounds.ths typs of wastwatrs ar difficult to trat.svral rsarch rports provd that vn small quantitis of dys ar highly toxic which causs acut disordrs to both aquatic organisms and non-aquatic organism. Mthyln Blu (MB) is on of th most important cationic dys usd as a coloring agnt in papr, cottons and wools, but th sam tim if it is prsnt in watr to produc various dangrous ffcts on human bings and animals. Furthr, it causs srious disass such as hart rat incrasing, nausa, vomiting, diarrha and vn cancr.in prsnt day many tratmnt mthods hav bn usd to rmov th dys from wastwatr namly lctrochmical coagulation, rvrs osmosis, nano filtration, adsorption using activatd matrials tc., Among ths mthods, adsorption is on of th bst tratmnt mthod bcaus of highly ffctiv, low oprating cost and conomical mthod for th rmoval of both inorganic and organic pollutants from wastwatrs. In this study has usd Cassia Auriculata activatd carbon. Th carbon was prpard from through carbonization and activation procss using concntratd sulphuric acid. Th prpard activatd carbon has high surfac ara, high adsorptiv capacity and asily availabl. In th prsnt work, th rmoval of Mthyln Blu Dy from aquous solutions using th abov adsorbnt with th following paramtrs viz th ffcts of initial dy concntration, contact tim, ph and adsorbnt dos on Mthyln Blu adsorption hav bn studid and adsorption isothrm, kintics ar also stablishd, calculatd and discussd. 2. MATERIALS AND METHODS: 2.1 PREPARATION OF ADSORBATE: Th adsorbat was prpard by dissolving 1g of dy in 1L of distilld watr to giv concntration of 1000 mg/l. Th srial dilutions say 25, 50, 75, 100 and 125 mg/l wr mad by diluting th dy stock solution in accurat proportions. Th chmical structur of th Mthyln Blu dy is shown in figur. I 1 Structur of Mthyln Blu ISSN : Vol. 8 No. 02 Fb

2 2.2 PREPARATION OF ADSORBENT: Th adsorbnt (Cassia Auriculata) wr collctd from various rgions of Tiruvarur District in Tamil Nadu, India. Furthr it was air drid in sunlight and carbonizd with concntratd sulphuric acid in th wight ratio of 1:1(w/v). Th carbonizd matrials wr powdrd and activatd in a muffl furnac kpt at 800 o C for a priod of 60 minuts. Th rsulting carbon namd as Activatd Nano Carbon, finally it was stord in a vacuum dsiccator. 3. RESULTS AND DISCUSSION: 3.1 EFFECT OF CONTACT TIME: Th ffct of contact tim on th amount of dy adsorbd was invstigatd at 1000 mg/l concntration of th dy (Fig. 1). It was obsrvd that th prcntag rmoval of dy incrass rapidly with an incras in contact tim initially, and thraftr, byond a contact tim of about 50 min, no noticabl chang in th prcntag rmoval was obsrvd th prcntag rmovals aftr 50 min wr 93%. Thrfor, th study found that th optimum contact tim is considrd to b 50 min. This is also th quilibrium tim of th batch adsorption xprimnts, sinc byond a contact tim of 50 min, adsorption is not changd. Th rapid rmoval of dy was obsrvd at th bginning of th contact tim du to th prcntag of larg numbr of binding sits availabl for adsorption. 3.2EFFECT OF ADSORBENT DOSE: Th adsorption of th Mthyln Blu dy on Cassia Auriculata was studid by varying th adsorbnt dos ( mg/50ml) for 50 mg/l of dy concntration. Th prcntag of adsorption incrasd with incrasd in th adsorbnt dos, which was attributd to incrasd carbon surfac ara and th availability of mor adsorption sits. Hnc, all studis wr carrid out with 0.025g of adsorbnt/50 ml of th varying adsorbat solutions. 25,50,75,100 and 125 mg/l. Th rsults obtaind from this study wr shown in Fig.2. Th amount of Mthyln Blu dy adsorbd pr gram rducd with incrasd in th dosag of Cassia Auriculata. This rvald that th dirct and quilibrium capacitis of Mthyln Blu dy wr functions of th activatd Cassia Auriculata dosag. 3.3 EFFECT OF ph: Th ffct of ph on th adsorption of Mthyln Blu dy onto ACANC was xamind in th ph rang of 2 to 10. Diffrnt ph solutions wr prpard by adding 0.1 M HCl and 0.1 M NaOH solutions drop wis to achiv ph valus. Th Fig.3 rvald that th fficincy of Mthyln Blu dy rmoval incrasd with incrasing ph from 5 to 7 aftr that th marginal incras was obsrvd. In th study obsrvd that th highst Mthyln Blu dy rmoval was achivd at ph rang from 5 to 7.Th rsults suggstd that th rmoval fficincy of ACANC wr found to dcras both at lowr and highr than ph ADSORPTION ISOTHERMS: It is an important to dtrmin th most appropriat corrlation for quilibrium adsorption isothrm, to optimiz th dsign of a sorption systm. Th Langmuir, Frundlich, Tmkin, Dubinnin-Radushkvich, Hurkins-Jura, Halsay, Radlich-Ptrson, Jovanovic and BET isothrm modls wr usd to analyss th adsorption quilibrium. Exprimntal isothrm data wr obtaind at an adsorption tim of 45 min at diffrnt tmpraturs. ISSN : Vol. 8 No. 02 Fb

3 3.4.1 FREUNDLICH ADSORPTION ISOTHERM Th Frundlich adsorption isothrm is basd on th quilibrium adsorption on htrognous surfacs. This isothrm was drivd from th assumption that th adsorption sits ar distributd xponntially with rspct to hat of adsorption. Th adsorption isothrm is xprssd by th following quation. 1/nF q =K FC (1) This can b linarizd as lnq = lnk F +1/nFlnC (2) Whr q is th amount of Mthyln Blu dy adsorbd (mg/g), C is th quilibrium concntration of dy in solution (ppm). K F (L/g) and 1/nF ar th Frundlich constants rlatd to adsorption capacity and sorption intnsity, rspctivly. Th Frundlich constants K F and 1/n F wr calculatd from th slop and intrcpt of th lnq VslnC plot, as shown in Fig.4, and th modl paramtrs ar shown in tabl 2. Th magnitud of K F showd that adsorbnt had a high capacity for Mthyln Blu dy adsorption from th aquous solutions studid. Th Frundlich xponnt, n F, should hav valus in th rang of 1 and 10 (i.., 1/n F <1) to b considrd as favorabl adsorption. A 1/n F valu of lss than 1 indicatd that Mthyln Blu dy is favorably adsorbd by adsorbnt. Th Frundlich isothrm did not show a good fit to th xprimntal data as indicatd by SSE and Chi-squar statistics LANGMUIR ADSORPTION ISOTHERM Th thortical Langmuir isothrm is usd for adsorption of a solut from a liquid solution as monolayr adsorption on a surfac containing a finit numbr of idntical sits. Thrfor, th Langmuir isothrm modl was chosn for stimation of th maximum adsorption capacity corrsponding to complt monolayr covrag on th adsorbnt surfac. Th Langmuir non-linar quation is commonly xprssd as follows: C 1 C = + q q m K L q (3) m Whr C is th quilibrium concntration of adsorbat in th solution (mg/l), q is th amount adsorbd at quilibrium (mg/g),q m and b ar Langmuir constants rlatd to adsorption fficincy and nrgy of adsorption, rspctivly. Th linar plots of C / q vs. C as shown in Fig.5 suggst th applicability of th Langmuir isothrms. Th valus of q m and b wr calculatd from slop and intrcpts of th plots ar givn in Tabl 2. From th rsults, it is obvious that th valu of adsorption fficincy q m and adsorption nrgy b of th ACANC incrass on incrasing th tmpratur. Th valus can conclud that th maximum adsorption corrsponds to a saturatd monolayr of adsorbat molculs on adsorbnt surfac with ndothrmic natur of adsorption. To confirm th favorability of th adsorption procss, th sparation factor (R L ) was dtrmind and givn in Tabl 3. Th valus wr stablishd to b btwn 0 and 1 and confirm that th ongoing adsorption procss is favorabl TEMKINADSORPTIONISOTHERM Th Tmkin adsorption isothrm assums that th hat of adsorption dcrass linarly with th sorption covrag du to adsorbnt-adsorbat intractions. Th Tmkin isothrm quation is givn as: RT q = ln(k C )...(4) bt T This can b rprsntd in th following linar form RT RT q = lnk + lnc...(5) b T b Whr, K T (L/g) is th Tmkin isothrm constant, b T (j/mol) is a constant rlatd to hat of sorption, R is th idal gas constant (8.314 J/mol K), and T is absolut tmpratur (k). A plot of q vrsus lnc nabls th dtrmination of isothrm constants K T and b T from th slop and intrcpt, as shown in Fig.6. Th modl paramtrs ar listd in Tabl 2. Th Tmkin isothrm appars to provid a good fit to th Mthyln Blu dy adsorption data. Th adsorption nrgy in th modl, b T, is positiv for Mthyln Blu dy adsorption from th aquous solution, which indicats that th favorabl adsorptions. Th xprimntal quilibrium curv is clos to that prdictd by Tmkin modl. Consquntly, th adsorption isothrm of Mthyln Blu dy on ACANC can b dscribd rasonably wll by th Tmkin isothrm. ISSN : Vol. 8 No. 02 Fb

4 3.4.4 HURKINS-JURA ADSORPTION ISOTHERM Th Hurkins-Jura adsorption isothrm can b xprssd as: q = AH...(6) B H+logC This can rarrangd as follows: 1 q B 1 logc 7 A A Whr, A H (g 2 /L) and B H (mg 2 /L) ar two paramtrs charactrizing th sorption quilibrium. Th isothrm quation accounts for multilayr adsorption and can b xplaind by th xistnc of a 2 htrognous por distribution. Th Harkins-Jura isothrm paramtrs ar obtaind from th plots of 1/q vrsus log C nabls th dtrmination of modl paramtrs A H and B H from th slop and intrcpt in Fig HALSAY ADSORPTION ISOTHERM Th Halsay adsorption isothrm can b givn as lnkha -lnc q =xp...(8) nha And, a linar form of th isothrm can b xprssd as follows: lnkha lnc lnq = -...(9) nha nha Whr, K Ha (mg/l) and n Ha ar th Halsay isothrm constants. A plot of lnqvslnc, shown in Fig.8, nabls th dtrmination of nha and KHa from th slop and intrcpt. This quation is suitabl for multilayr adsorption and th fitting of th xprimntal data to this quation attst to th htroporous natur of adsorbnt. Fig. 8 also shows that th xprimntal data and th modl prdictions basd on th non-linar form of th Halsay modls. Th modl paramtrs ar listd in Tabl 2. This rsult also shows that th adsorption of Mthyln Blu dy on ACANC was not basd on significant multilayr adsorption. Th Halsay modl is also not suitabl to dscrib th adsorption of Mthyln Blu dy on ACANC, bcaus this modl also assums a multilayr bhavior for th adsorption of adsorbat onto adsorbnt RADLICH-PETERSON ADSORPTION ISOTHERM Th Radlich-Ptrson adsorption isothrm contains thr paramtrs and incorporats th faturs of Langmuir and Frundlich isothrms into a singl quation. Th gnral isothrm quation can b dscribd as follows KRC q =...(10) g 1+aR C Th linar form of th isothrm can b xprssd as follows: ln C =glnc -lnk...(11) q R Whr, K R (L/g) and a R (L/mg) ar th Radlich-Ptrson isothrm constants and g is th xponnt btwn 0 and 1. Thr ar two limiting cass: Langmuir form for g=1 and Hnry s law for g=0. A plot of lnc /q vrsus lnc shown in Fig.9 nabls th dtrmination of isothrm constants g and K R from th slop and intrcpt. Th valus of K R, prsntd in tabl 2, indicat that th adsorption capacity of th ACANC dcrasd with an incras tmpratur. Furthrmor, th valu of g lis btwn 0 and 1, indicating favorabl adsorption DUBININ-RADUSHKEVICH ADSORPTION ISOTHERM Th Dubinin-Radushkvich adsorption isothrm is anothr isothrm quation. It is assumd that th charactristic of th sorption curv is rlatd to th porosity of th adsorbnt. Th linar from of th isothrm can b xprssd as follows 2 1 lnq =lnq -B RTln 1+...(12) D D C Whr, Q D is th maximum sorption capacity (mol/g), and B D is th Dubinin-Radushkvich constant (mol 2 /kj 2 ). A plot of lnq VsR T ln(1+1/c ) shown in Fig.10 nabls th dtrmination of isothrm constants B D and Q D from th slop and intrcpt. Th Q D valus obtaind (tabl 2) from th graph shows th adquat tndncy of ACANC adsorbnt to adsorb Mthyln Blu. ISSN : Vol. 8 No. 02 Fb

5 3.4.8 JOVANOVIC ADSORPTION ISOTHERM Th modl of an adsorption surfac considrd by Jovanovic is ssntially th sam as that considrd by Langmuir. Th Jovanovic modl lads to th following rlationship: max q =q 1- K C Th linar form of th isothrm can b xprssd as follows: J.. (13) lnq = lnq m ax -K JC (14) Whr, K J (L/g) is a paramtr. Q max (mg/g) is th maximum Mthyln Blu dy uptak. Th q max is obtaind from a plot of lnq and C shown in Fig.11, Thir rlatd paramtrs ar listd in tabl 2. By comparing th valus of th rror functions, it was found th Langmuir and Jovanovic modls ar bst to fit th Mthyln Blu dy adsorption on th ACANC. Both modls show a high dgr of corrlation.this is clarly confirms th good fitnss of Langmuir and Jovanovic with th xprimntal data for rmoval of Mthyln Blu dy from th solution THE BRUNAUER-EMMETT-TELLER (BET) ISOTHERM MODEL Brunaur-Emmtt-Tllr (BET) isothrm is a thortical quation, most widly applid in th gas-solid quilibrium systms. It was dvlopd to driv multilayr adsorption systms with rlativ concntration rangs from 10 to 50 mg/l corrsponding to a monolayr covrag lying btwn and Its xtinction modl rlatd to liquid-solid intrfac is xhibitd as: qc s BETC q =...(15) (Cs-C )[1+(CBET-1)(C /C s )] Whr, C BET, Cs, qs and q ar th BET adsorption isothrm rlating to th nrgy of surfac intraction (L/mg), adsorbat monolayr saturation concntration (mg/l), thortical isothrm saturation capacity (mg/g) and quilibrium adsorption capacity (mg/g), rspctivly. As C BET and C BET (C /C s ) is much gratr than 1, In th linar form as usd is rprsntd as C 1 CBET -1 C = +...(16) q C -C qsc s BET qc s BET C s In th BET isothrm modl for slop and intrcpt of th C /q (C s -C ) VsC /C s shown in Fig.12, plot wr usd to calculat C BET and q s th arrivd C BET and q s valus ar listd in tabl 2, th BET modl graph indicats th physical natur of adsorption of Mthyln Blu dy onto ACANC. 3.5 KINETIC PARAMETERS: Th rat and mchanism of th adsorption procss can b lucidatd basd on kintic studis. Mthyln Blu dy adsorption on solid surfac may b xplaind by two distinct mchanisms: (1) an initial rapid binding of Mthyln Blu dy molculs on th adsorbnt surfac; (2) rlativly slow intra-particl diffusion. To analyz th adsorption kintics of th Mthyln Blu dy, th psudo-first-ordr, th psudo-scond-ordr, and intraparticl diffusion modls wr applid. Each of ths modls and thir linar mods of thm quations prsntd in blow. KINETIC MODELS AND THEIR LINEAR FORMS Modl Nonlinar Form Linar Form Numbr of Equation Psudo-first-ordr dq /d = k ( q -q t t 1 t Psudo-scond-ordr 2 dq /d = k ( q -q ) t t 2 t ) ln ( q -q ) = ln q -k t t 1 (17) 1 t/q = t k 2 q 2 + ( 1/q) t Whr, q and q t rfr to th amount of Mthyln Blu dy adsorbd (mg/g) at quilibrium and at any tim, t (min), rspctivly and k 1 (1/min), k 2 (g/mg.min) ar th quilibrium rat constants of psudo-first ordr and psudo-scond ordr modls, rspctivly. Psudo-first ordr is a simpl kintic modl, which was proposd by Lagrgrn during 1898 and is usd for stimation of th surfac adsorption raction rat. Th valus of ln (q -q t ) wr linarly corrlatd with t. Th plot of ln (q -q t ) Vs t should giv a linar rlationship from which th valus of k 1 wr dtrmind from th slop of th plot. In many cass, th first-ordr quation of Lagrgrn dos not fit wll with th ntir rang of contact tim and is gnrally applicabl ovr th initial stag of th adsorption procsss. (18) ISSN : Vol. 8 No. 02 Fb

6 In th psudo-scond ordr modl, th slop and intrcpt of th t/qtvs t plot wr usd to calculat th scondordr rat constant, k 2. Th valus of quilibrium rat constant (k 2 ) ar prsntd in Tabl 5. According to Tabl 5, th valus of R 2 (0.999) rlatd to th psudo-scond ordr modl rvald that Mthyln Blu dy adsorption followd this modl. 3.6 THE ELOVICH EQUATION: Th Elovich modl quation is gnrally xprssd as Th simpl Elovich modl is xprssd in th form, q t = α + β ln t..(19) Whr α is th initial adsorption rat (mg g -1 min -1 ) and β is th dsorption constant (g/mg) during any on xprimnt. To simplify th Elovich quation.chin and Clayton (1980) assumd αβt>>t and by applying boundary conditions q t =0 and q t at t=t Eq.(19) bcoms: Q t = 1/β ln (αβ) + 1/β lnt (20) Mthyln Blu dy adsorption fits with th Elovich modl, a plot of q t vs.ln(t) yilds a linar rlationship with a slop of (1/β) and an intrcpt of (1/β)ln(αβ). Th Elovich modl paramtrs α,β, and corrlation cofficint (γ) ar summarizd in Tabl 5. Th xprimntal data such as th initial adsorption rat (α) adsorption constant (β) and th corrlation co-fficint (γ) calculatd from this modl indicats that th initial adsorption (α) incrass with tmpratur similar to that of initial adsorption rat (h) in psudo-scond-ordr kintics modls. This may b du to incras th por or activ sit on th adsorbnt 3.7INTRA-PARTICLE DIFFUSION MODEL: Kintic data was furthr analyzd using th Intra-particl diffusion modl basd on th thory proposd by Wbr and Morris. Th amount of Mthyln Blu dy adsorbd (q t ) at tim t was plottd against th squar root of tim (t 1/2 ), according to q. q t = K id t 1/2 + C..(21) Whr, K id is th Intra-particl diffusion rat constant and c is th intrcpt rlatd to th thicknss of th boundary layr. According to abov quation a plot of q t vs t 1/2 givs a straight lin from th origin says th adsorption mchanism follows th intra-particl diffusion procss only. Howvr, th data xhibit multi linar plots, says th procss ar govrnd by two or mor stps, it is clar from that thr ar two sparat zons: first linar portion (phas I) and scond linar part (phas II). Th first linar portion (Phas I) can b attributd to th immdiat utilization of th most radily availabl adsorbing sits on th adsorbnt surfac, phas II may b attributd to vry slow diffusion of th adsorbat from th surfac sit in to th innr pors. Thus initial portion of Mthyln Blu dy adsorption by adsorbnt may b govrnd by th initial intra-particl transport of Mthyln Blu dy controlld by surfac diffusion procss and th latr part controlld by por diffusion. Howvr, th intrcpt of th lin fails to pass through th origin which may b du to th diffrnc in th rat of mass transfr in th initial and final stags of adsorption. Furthr, such dviation of th straight lins from th origin rvals that th por diffusion is not th sol rat-controlling. 3.8THERMODYNAMIC STUDIES: Thrmodynamic paramtrs rlatd to th adsorption procss, i.., Gibb s fr nrgy chang (ΔG 0, KJ mol -1 ), nthalpy chang (ΔH 0, KJ mol -1 ) and ntropy chang (ΔS 0, J mol -1 K -1 ) ar dtrmind by th following quations: ΔG 0 = ΔH 0 - TΔS 0 (22) ΔG 0 = -RTln(K c )..(23) Whr, R is th univrsal gas constant (8.314 JK -1 mol -1 ), T is th absolut tmpratur (Klvin) and K rprsnts th quilibrium adsorption constants of th isothrm fits (K L, Langmuir quilibrium constant and K f, Frundlich quilibrium constant, which must b convrtd to SI units, by using th molcular mass of th dy) obtaind from th isothrm plots. ΔH 0 and ΔS 0 valus can b calculatd from th slop and intrcpt of th linar plot of ln(k) vrsus 1/T. Thrmodynamic rsults ar dpictd in Tabl4. Enthalpy changs (ΔH 0 ) indicat that adsorption followd ndothrmic procsss. Ngativ valus of ΔG 0 indicat that th Mthyln Blu dy adsorption by th adsorbnt is spontanous and favorabl procsss for all studid tmpraturs. Th positiv valus of ΔS 0 confirm a high prfrnc of Mthyln Blu molculs for th carbon surfac of adsorbnt and also suggst th possibility of som structural changs or radjustmnts in th dy-carbon adsorption complx. Bsids, it is consistnt with th dhydration of dy molcul bfor its adsorption to carbon surfac, and th rlass watr molculs to th bulk solution. Th incras in th adsorption capacitis of adsorbnt at highr tmpraturs may b attributd to th nhancd mobility and pntration of dy molculs within th adsorbnt porous structurs by ovrcoming th activation nrgy barrir and nhancing th rat of intra-particl diffusion. ISSN : Vol. 8 No. 02 Fb

7 In ordr to support that physical adsorption is th prdominant mchanism, th valus of activation nrgy (Ea) and sticking probability (S * ) wr calculatd from th xprimntal data. Thy wr calculatd using modifid Arrhnius typ quation rlatd to surfac covrag (θ) as follows: = C (24) C i Ea S* (1 ) (25) RT Th sticking probability, S *, is a function of th adsorbat/adsorbnt systm undr considration but must satisfy th condition 0 < S * <1 and is dpndnt on th tmpratur of th systm. Th valus of E a and S * can b calculatd from slop and intrcpt of th plot of ln(1-θ) vrsus 1/T rspctivly and ar listd in tabl 4. Th rsult as shown in tabl 4 indicat that th probability of th Mthyln Blu dy to stick on surfac of biomass is vry high as S * << 1, ths valus confirm that, th sorption procss is physisorption. Th activation nrgy (E a ) valu 40 KJ/mol confirms th physical natur of adsorption. 3.9 CONCLUSION: On th basis of th abov studis, th following can b concludd: Charactrization of Cassia Auriculata was carrid out which rvald that th surfac of th adsorbnt was rough and suitabl for adsorption. Cassia Auriculata has shown a potntial to rmov Mthyln Blu dy from aquous solution. Initial concntration of th Mthyln Blu dy plays an important rol in th rmoval procss. Kintics of th rmoval was studid and th valus of rat constants wr dtrmind. Th dy rmoval was found to b govrnd by film diffusion mchanism whr xtrnal transport of th adsorbat ovr surfac of th adsorbnt is gratr than intrnal transport which was confirmd by th intra-particl diffusion and th procss of rmoval was found to follow scond ordr kintics. Thrmodynamic paramtrs wr calculatd for th rmoval of Mthyln Blu dy and thir valus indicatd that th procss of rmoval was spontanous and ndothrmic. Th quilibrium data s wr found to bst fittd in Langmuir and BET isothrm modl. It can thrfor b concludd that Cassia Auriculata offrs promis as an conomically viabl altrnativ for squstring of th Mthyln Blu dy from th aquous solution. Th work can b xtndd for th rmoval of Mthyln Blu dys from fflunts as wll. Tabl: 1. Equilibrium paramtrs for th adsorption of mthyln blu dy onto acanc M 0 C (mg / L) Q (mg / L) Rmoval % Tabl: 2. Isothrm paramtrs for th adsorption of mthyln blu dy onto acanc Modl Frundlich Langmuir Tmkin Hurkins-Jura Halsay Radlich-Ptrson Constant Tmpratur ( o C) K f (mg/g) (L/mg) 1/n N Q m (mg/g) b (L/mg) b T (J/mol) K T (L/mg) A H (g 2 /L) B H (mg 2 /L) K Ha (mg/l) n Ha G K R (L/g) ISSN : Vol. 8 No. 02 Fb

8 Dubinin- Radushkvich Jovanovic BET q s (mg/g) K D 10-4 mol 2 kj K J (L/g) q max (mg/g) C BET (L/mg) qs (mg/g) Tabl: 3. Dimnsionlss spration factor (r l ) for th adsorption of mthyln blu dy onto acanc (C i ) Tmpratur C Tabl: 4. Thrmodynamic paramtr for th adsorption of mthyln blu dy onto acanc G 0 (C 0 ) H 0 S 0 E a S * Tabl: 5. Th kintic paramtrs for th adsorption of mthyln blu dy onto acanc C Tmp C Psudo scond ordr Elovich modl Intraparticl diffusion q k 2 h K id C ISSN : Vol. 8 No. 02 Fb

9 % Rmoval of MB Dy Fig.1- Efft of Contact Tim in Min % Rmoval of MB Dy Fig.2-Adsorbnt dos in mg ISSN : Vol. 8 No. 02 Fb

10 % Rmoval of MB Dy Fig.3- Effct of initial ph lnq lnc Fig.4- Frundlich adsorption isothrm ISSN : Vol. 8 No. 02 Fb

11 C /Q C Fig.5- Langmuir adsorption isothrm q lnc Fig.6 - Tmkin adsorption isothrm ISSN : Vol. 8 No. 02 Fb

12 /q logc Fig. 7- Hurkins Jura adsorption isothrm lnq lnc Fig.8- Halsay adsorption isothrm ISSN : Vol. 8 No. 02 Fb

13 lnc /q O C 40 O C 50 O C 60 O C lnc Fig.9 - Radlich - Ptrson adsorption isothrm lnq RTln(1+1/C ) Fig.10- Dubinin-Radushkvich adsorption isothrm ISSN : Vol. 8 No. 02 Fb

14 lnq C Fig.11-Jovanovic adsorptio isothrm C /q (C s -C ) C /C s Fig.12- BET adsorption isothrm ISSN : Vol. 8 No. 02 Fb

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