TY  - JOUR
N2  - Arsenic occurs in groundwater in two valence states, as trivalent arsenite As(III) and as pentavalent arsenate As(V). As(III) is more toxic and more difficult to remove from water by adsorption on activated alumina. In this study the ability of rice husk silica to adsorb As(III) from water was examined. Silica was prepared by burning rice husk in amuffle furnaceat 500°C. Batch adsorption tests showed that extent of As(III) adsorption depends on pH, initial As(III) concentration and the contact time. Equilibrium adsorption was attained within 180 min, with maximum adsorption occurring at a pH value of 7-8 which is in the pH range for groundwater. The adsorption of As(III) by rice husk silica followed pseudo second-order kinetics. Equilibrium adsorption data were well described by the Langmuir and Freundlich isotherm models. According to the Langmuir isotherm, As(III) adsorption capacity of rice husk silica is 1.897 mg/g which is 10.5x higher than that (0.180 mg/g) of activated alumina. Hence, rice husk silica would be an effective substitute for activated alumina in the removal of As(III) from groundwater at wells or in households.
IS  - 2
KW  - Activated alumina; Aluminum oxide; Groundwater; Isotherms; pH; Silica
KW  -  Adsorption capacities; Arsenite; Batch adsorption tests; Equilibrium adsorption; Langmuir and Freundlich isotherm models; Langmuir isotherm; Pseudo second order kinetics; Rice husk silica
KW  -  Adsorption
KW  -  adsorption; aluminum oxide; arsenite; isotherm; pH; plant product; pollutant removal; rice; silica; toxic material; well water
ID  - scholars3180
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-84862893824&partnerID=40&md5=589a73a8c90fec5ed09ab3bdc1d7fd37
JF  - Nature Environment and Pollution Technology
A1  - Khan, T.
A1  - Ab Wahap, S.A.B.
A1  - Chaudhuri, M.
VL  - 11
Y1  - 2012///
N1  - cited By 8
SP  - 229
TI  - Adsorption of arsenite from water by rice husk silica
AV  - none
EP  - 233
SN  - 09726268
PB  - Technoscience Publications
ER  -