Humic acids removal from water by aminopropyl functionalized rice husk ash

Apichat Imyim; Eakachai Prapalimrungsi

doi:10.1016/j.jhazmat.2010.08.108

Humic acids removal from water by aminopropyl functionalized rice husk ash

J Hazard Mater. 2010 Dec 15;184(1-3):775-781. doi: 10.1016/j.jhazmat.2010.08.108.

Authors

Apichat Imyim¹, Eakachai Prapalimrungsi²

Affiliations

¹ Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. Electronic address: iapichat@chula.ac.th.
² Inter-Department of Environmental Science, Graduate School, Chulalongkorn University, Bangkok 10330, Thailand.

PMID: 20869173
DOI: 10.1016/j.jhazmat.2010.08.108

Abstract

The use of rice husk ash (RHA) as an adsorbent for the adsorption of humic acids from water was studied. Optimum conditions for humic acids adsorption were found in batch method as follows, 60 min equilibrium time and initial in the range of pH 3-4. In addition, RHA was functionalized with 3-aminopropyltriethoxysilane. Again, the adsorption behavior of the modified rice husk ash (RHA-NH(2)) was studied. Optimum conditions for humic acids adsorption were found to be 30 min equilibrium time and initial pH in the range of 3-4. The adsorption capacity of RHA-NH(2) was higher than that of RHA. Experimental adsorption data fitted well with the Langmuir equation and the maximum adsorption capacity was 8.2mg/g. at pH 6. The column method was also performed. The comparative adsorption efficiencies of RHA-NH(2) and commercial activated carbons showed insignificant difference. The RHA-NH(2) adsorbent was applied for humic acids removal from surface water.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Humic Substances*
Hydrogen-Ion Concentration
Oryza / chemistry*
Water / chemistry*

Substances

Humic Substances
Water