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1 Supporting informtion Polyimide nnofibers by Green electrospinning vi queous solution for filtrtion pplictions Shohu Jing, Hoqing Hou b, Seem Agrwl, Andres Greiner * Mcromoleculr Chemistry II, University of Byreuth, Universitätsstrße 30, Byreuth, Germny. b Deprtment of Chemistry nd Chemicl Engineering, Jingxi Norml University, Nnchng, , Chin. S1

2 Tble S1-1. Composition of the electrospinning solutions nd their electrospinnbility. Smples C (PAA, %) W(NH 3. H 2 O)/W(PAA) W (PAA, g) W (H 2 O, g) W (NH 3.H 2 O, 25 wt%) (mg) Additive (PEO, mg) Solubility Very Very - viscos viscos Spinnbility ; Voltge (kv) -2 Flow rte (ml/h) b 0.92 b Tble S1-2. Composition of the electrospinning solutions nd their electrospinnbility. Smples C (PAA, %) W(NH 3. H 2 O)/W(PAA) W (PAA, g) W (H 2 O, g) W (NH 3.H 2 O, 25 wt%) (mg) Additive (PEO, mg) Solubility Spinnbility Voltge (kv) +30; +30; +26; +26; +26; +26; +22; +22; +21; Flow rte (ml/h) b 0.54 b b b Note: Voltge from 5 to 30 kv () nd flow rte in the rnge ml/h (b) were tested. Solubility --: not soluble; +-: prtil soluble; ++: very good solubility. Definition of spinnbility 1: not spinnble t ll; 2: spinnble with only few fibers but lrge mount of droplets; 3: better spinnbility thn 2 tht more fibers were obtined nd very few droplets were obtined; 4: good spinnbility with inhomogeneous S

3 fibers; 5: very good spinnbility with stble spinning process nd uniform fibers. Figure S1. SEM photos of Fe 2 O 3 prticles t different mgnifictions. Tble S2 Dt of coting density nd pressure drop from different kinds of filter medi. Coting density (g/m 2 ) Pressure drop (P) Filter medi References Alumin-700 [1] Alumin Alumin MWNT-I [2] MWNT-II MWNT-III MWNT-IV PP [3] PP [4] PAN [5] PAN [6] PAN/silic [7] silic [8] PA6 [9] PA-56 [10] S3

4 PU [11] Tble S3 Dt of QF nd coting density from different kinds of filter medi. QF (P -1 ) Coting density (g/m 2 ) Filter medi References Alumin-700 [1] Alumin Alumin MWNT-I [2] MWNT-II MWNT-III MWNT-IV PP [3] PP [12] PP [4] PP [13] PAN [5] PAN [6] (1/cm H2O) 13.4 polysulfone [14] References [1] Wng Y, Li W, Xi Y, Jio X, Chen D. Electrospun flexible self-stnding [gmm]-lumin fibrous membrnes nd their potentil s high-efficiency fine prticulte filtrtion medi. J Mter Chem A. 2014;2(36): S4

5 [2] Viswnthn G, Kne DB, Lipowicz PJ. High Efficiency Fine Prticulte Filtrtion Using Crbon Nnotube Cotings. Adv Mter. 2004;16(22): [3] Podgórski A, Błzy A, Grdoń L. Appliction of nnofibers to improve the filtrtion efficiency of the most penetrting erosol prticles in fibrous filters. Chem Eng Sci. 2006;61(20): [4] Shim WS, Lee DW. Qulity vribles of meltblown submicron filter mterils. Indin J Fibre Text Res. 2013;38(2): [5] Zhng Q, Welch J, Prk H, Wu C-Y, Sigmund W, Mrijnissen JCM. Improvement in nnofiber filtrtion by multiple thin lyers of nnofiber mts. J Aerosol Sci. 2010;41(2): [6] Mei Y, Wng Z, Li X. Improving filtrtion performnce of electrospun nnofiber mts by bimodl method. J Appl Polym Sci. 2013;128(2): [7] Wng N, Si Y, Wng N, Sun G, El-Newehy M, Al-Deyb SS, et l. Multilevel structured polycrylonitrile/silic nnofibrous membrnes for high-performnce ir filtrtion. Sep Purif Technol. 2014;126: [8] Mo X, Si Y, Chen Y, Yng L, Zho F, Ding B, et l. Silic nnofibrous membrnes with robust flexibility nd therml stbility for high-efficiency fine prticulte filtrtion. RSC Adv. 2012;2(32): [9] Hung C-H, Leung WW-F. Filtrtion of nno-erosol using nnofiber filter under low Peclet number nd trnsitionl flow regime. Sep Purif Technol. 2011;79(1): [10] Liu B, Zhng S, Wng X, Yu J, Ding B. Efficient nd reusble polymide-56 nnofiber/nets membrne with bimodl structures for ir filtrtion. J Colloid Interfce Sci. 2015;457: [11] Smber W, Ztloukl M, Kimmer D. 3D ir filtrtion modeling for nnofiber bsed filters in the ultrfine prticle size rnge. Chem Eng Sci. 2012;82: [12] Yng S, Lee GWM. Filtrtion chrcteristics of fibrous filter pretreted with nionic surfctnts for monodisperse solid erosols. J Aerosol Sci. 2005;36(4): [13] Hssn MA, Yeom BY, Wilkie A, Pourdeyhimi B, Khn SA. Fbriction of nnofiber meltblown membrnes nd their filtrtion properties. J Membr Sci. 2013;427: [14] Hung H-L, Yng S. Filtrtion chrcteristics of polysulfone membrne filters. J Aerosol Sci. 2006;37(10): S5