Table 1. Summary of Biopolymer-Based Filter Materials.

	filtering efficiency
biopolymer	pollutants	virus	bacteria	pressure drop	ref
silk	VOC 99.4%	nucleopolyhedrovirus	E. coli	98 Pa	(5,12,22)
	PM2.5: 98.8%		M. luteus
	PM0.3: 96.2%
	Cu2+: 1.65 μg/mg
keratin	HCHO: 70%	N/A	E. coli: 99.9%	N/A	(5,23)
	Cu2+: 2.88 μg/mg		S. aureus: 99.9%
	Cr3+
soy	HCHO, CO: 90%	N/A	E. coli: 80%	136 Pa	(3,4)
	PM2.5: 99.8%		B. subtilis: 80%
	PM10–2.5: 99.99%
zein	PM0.1–10: >99.5%	N/A	N/A	175–180 Pa	(24)
	HCHO, CO: >70%
cellulose	PM2.5: 99.0%	influenza A	S. aureus	112.5 Pa/g	(1,2)
	PM0.3: 93.3%	caliciviruses	E. coli: 3 log reduction of CFU
		hepatitis A	C. freundii
		hepatitis C	K. pneumoniae
		herpes simplex
		enterovirus
		astrovirus
		norovirus
		West Nile
chitin, chitosan	NaCl aerosols: 92%	HIV-1	E. coli: 99.4%	147.6 Pa	(7,20,25)
	PM2.5: 100% removal from 999 μg m–3 in 33 min		S. aureus: 99.5%
	Cr(VI)		P. aeruginosa
			B. subtilis
			S. choleraesuis
			P. mirabilis
			S. enteritidis
			E. aerogenes
			Corynebacterium
			S. epidermidis
			E. faecalis
			P. gingivalis
			A. actinomycetemcomitans
			S. mutans
starch	N/A	adenovirus 41	E. coli: 100%	1619 Pa	(1)
		MS2 enterobacteria phage	S. aureus: 100%