Table 3.
The role of role of biopolymers and other natural materials in the fabrication of air filters.
| Ref | Results | Microorganism or pollutant | Materials |
|---|---|---|---|
| [63] | (Particulate matter 2.5 > 98.0%, particulate matter10 > 98.4%), high flow rate (1.9 m s−-1 after 1 h) a low (21 Pa) pressure drop. | Particulate matter | Chitosan/ poly(methylmethacrylate)/polydimethylsiloxane |
| [64] | 99.3% filtration efficacy for NaCl, and 99.4% for DEHS aerosol (Diisooctyl sebacate) | Diisooctyl sebacate aerosol | N-halamine/ poly(vinyl alcohol)/ chitosan |
| [65] | In 3 h of operating, 80.1% bioaerosol was removed | B. subtilis and E. coli | Chitosan/ polypropylene |
| [66] | After 120 min, the survival rate of microorganisms on pristine nylon, nylon/chitosan, as well as chitosan dipped nylon-6 nano-fibrous filters decreased to 8.4%, 7.1%, and 2.8%. | E. coli and B. subtilis | Nylon/chitosan |
| [68] | 99.69% efficiency for particulate matter 2.5 and 99.89% removal efficiency for particulate matter 10 | Particulate matters | Cholinium alginate |
| [69] | 94.92 and 96.94% inactivation | Bacteriophage phi 6 and SARS-CoV-2 Delta variant | Calcium alginate films |
| [70] | 99.99% effectiveness toward coronavirus, with low cytotoxicity | Coronavirus | Alginate/copper sulfate |
| [71] | 95% efficiency to capture aerosols | Aerosols | Gelatin/β–cyclodextrin |
| [72] | Capture effectiveness of modified HEPA filter was up to 2730 pfu/mm2 within 10 min. | Influenza virus | Polypropylene/ tannic acid |
| [73] | 95% efficiency of filtration for particulate matter 0.3 | Particulate matter | Soy protein isolate/polymide-6/Ag |
| [74] | 99.99% filtration effectiveness as well as 99.98% antimicrobial performance | Staphylococcus epidermidisS. epidermidis bioaerosols | Ethanolic extract of Sophora flavescens |
| [75] | Filters based on tea-tree, rosemary, and garlic extracts showed significant inactivation of M. luteus (99.99%, 99.0%, and 99.9% respectively). | M. luteus and E. coli | Plant extracts (rosemary, tea-tree oil, as well as garlic) |
| [76] | Good air filtration efficiency of 100% for particular matter 2.5 and 96.4% for particular matter 0.3 and also, the low-pressure drop was observed. | S. aureus | Poly(vinyl butyral)/berberine |