Premium
Biosorption of Pb 2+ from aqueous solution by rice straw modified with citric acid
Author(s) -
Guo Lei,
Liang Lingyu,
Wang Yaojing,
Liu Mingda
Publication year - 2015
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12225
Subject(s) - biosorption , citric acid , aqueous solution , rice straw , chemistry , nuclear chemistry , adsorption , straw , inorganic chemistry , sorption , biochemistry , organic chemistry
The rice straw, an enormous agricultural waste after harvest, was converted into biosorbent by using citric acid and sodium hydroxide for promoting its absorbability. The citric acid‐modified rice straw (CRS) was oriented to the potential utilization of removing Pb 2+ from aqueous solution. The Langmuir and Dubinin‐Radushkevich isotherm models were more appropriate to describe the Pb 2+ biosorption process. Zeta electric potential tests, FTIR, SEM, and XRD could characterize the physical‐chemical and morphological‐structural features of the biosorbent. Further analyses indicated that a great deal of negative charges, reactive functional groups and exchangeable ions which were introduced on the surface of adsorbent. The analyses of adsorption isotherm and thermodynamics revealed that the monolayer chemical adsorption accompanied ion‐exchange process might be the mechanism of the adsorption behaviors. The utilization of CRS might be a reasonable method for removal lead from wastewater. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 359–367, 2016