Open AccessJournal Article
Arsenic(III) Immobilization on Rice Husk
TLDR
In this article, the effect of quaternized rice husk on the adsorption of As(III) was examined and the results showed that the extent of adaption was dependent on pH, As (III) concentration, contact time, and rice hull dose.Abstract:
A number of large aquifers in various parts of the world have been identified with contamination by arsenic. Long-term exposure to arsenic in drinking water causes cancer of the skin, lungs, urinary bladder and kidney, as well as skin pigmentation and hyperkeratosis. Arsenic occurs in groundwater in two valence states, as trivalent arsenite [As(III)] and pentavalent arsenate [As(V)]. As(III) is more toxic and more difficult to remove from water by adsorption on activated alumina. In this study, immobilization (adsorption) of As(III) by quaternized rice husk was examined. Batch adsorption test showed that extent of adsorption was dependent on pH, As (III) concentration, contact time and rice husk dose. Maximum adsorption occurred at pH 7-8, and equilibrium adsorption was attained in 2 h. Equilibrium adsorption data were described by the Langmuir and Freundlich isotherm models. According to the Langmuir isotherm, adsorption capacity of quaternized rice husk is 0.775 mg As(III)/g, which is 4.3x higher than that (0.180 mg As(III)/g) of activated alumina. Quaternized rice husk is a potentially useful adsorbent for removing arsenic from groundwater.read more
Citations
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References
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Arsenic contamination of groundwater in Bangladesh
TL;DR: A survey of well waters from throughout Bangladesh, excluding the Chitt;agong Hill Tracts, has shown that water from 27% of the'shallow' tubewells, that is, wells less than 150 m deep, exceeded the Bangladesh standard for arsenic in drinking water (50 flg L -I) as mentioned in this paper.
Journal ArticleDOI
Adsorption of arsenite and arsenate within activated alumina grains: Equilibrium and kinetics
Tsair Fuh Lin,Jun Kun Wu +1 more
TL;DR: The agreement among the models and experimental data indicated that the adsorption and diffusion of arsenate and arsenite can be simulated by the proposed model.
Journal ArticleDOI
Equilibrium, kinetics and thermodynamic studies for adsorption of As(III) on activated alumina
TL;DR: In this paper, the effect of adsorbent dose, solution pH, and contact time has been investigated to remove arsenite ions [As(III)] by activated alumina.
Journal ArticleDOI
Magnitude of arsenic pollution in the Mekong and Red River Deltas--Cambodia and Vietnam.
Michael Berg,Caroline Stengel,Pham Thi Kim Trang,Pham Hung Viet,Mickey L. Sampson,Moniphea Leng,Sopheap Samreth,David Fredericks +7 more
TL;DR: The sediments of 12-40 m deep cores from the Red River delta contain arsenic levels of 2-33 microg/g and show a remarkable correlation with sediment-bound iron and in all three areas, the groundwater arsenic pollution seem to be of natural origin and caused by reductive dissolution of arsenic-bearing iron phases buried in aquifers.
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