Chigome et al. 2022 - Point-of-use arsenate filter media
Chigome and colleagues reviewed point-of-use filter-media development and reported experimental data for a chitosan-aluminum-titanium-iron-zirconium nanocomposite designed to remove arsenate from drinking water. This is a2 mitigation evidence: it does not report a consumer-product occurrence survey, but it does provide adsorption and prototype-filter performance data for arsenate removal.
Key numbers
The paper reiterates the World Health Organization and US EPA arsenic drinking-water target of 10 ppb. Batch adsorption results showed that with only 100 mg of the adsorbent, arsenate could be reduced from an initial concentration of 300 ppb to less than 10 ppb.
The reported maximum adsorption capacity for arsenate was 123 mg/g. The Langmuir isotherm fit was reported as 0.99518.
The prototype point-of-use filter data showed that with 60.0 g of the nanocomposite, it was possible to treat 650 L of drinking water with an initial arsenate concentration of 300 ppb down to less than 10 ppb.
The paper states that the material had a specific surface area of 56.4 m2/g. The presence of SiO3^2-, CO3^2-, and HCO3- caused a slight decline in adsorption efficiency, with carbonate and silicate ions described as the most consequential competitors for adsorption sites.
The contact-time experiment reported that over 95% adsorption was achieved within the first 30 min, and the adsorbent reduced arsenate from 1,000 ppb to less than 10 ppb in 60 min under the reported test conditions.
Methods (brief)
The authors fabricated a chitosan, aluminum, titanium, iron, and zirconium hybrid nanocomposite by a sol-gel process and characterized it by SEM, BET, FTIR, and SEM-EDAX before and after adsorption. Batch adsorption experiments varied adsorbent dose, pH, contact time, initial concentration, and competing ions. A prototype point-of-use filter was then fabricated using the nanocomposite as the active medium.
Implications
Certification: Do not use this source in product-occurrence or bottled-water concentration pools. It is remediation and filter-performance evidence based on prepared arsenate solutions and prototype treatment tests.
Courses: Useful for mitigation training on point-of-use arsenic removal, adsorbent design constraints, and why filter-media performance data should not be mixed with occurrence surveillance.
App: Context-only mitigation evidence for arsenic-removal strategies.
Wiki pages this source may touch
Verification notes
Recovered under the 2026-06-10 inclusion-by-default rule from an earlier skip:review-only-no-primary-data disposition. That earlier skip was too narrow because the paper includes original nanocomposite adsorption and prototype filter-performance results, not just background review prose.
Products and ingredients are intentionally empty because the matrix is prepared arsenate solution and prototype treatment media rather than a market product. Arsenic is tagged as iAs because the experiments specifically target As(V) arsenate rather than total arsenic.
Page history
The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.
| Commit | Date | Description |
|---|---|---|
| e619902 | 2026-06-13 | recovery | chigome2022 arsenate filter media |