Oxalic Acid Modified Rice Hull as a Sorbent for Methylene Blue Removal

APCBEE Procedia Pub Date : 2014-01-01 DOI:10.1016/j.apcbee.2014.01.029

Sook-Mun Lee , Siew-Teng Ong

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引用次数: 20

Abstract

The potential of oxalic acid modified rice husk (ORH) to adsorb Methylene Blue (MB) from aqueous solution was investigated under various experimental conditions. Parameters studied included pH, initial dye concentrations, contact time, sorption isotherm, agitation rate and adsorbent dosage. A comparison study on the percentage uptake of natural rice husk and oxalic acid modified rice husk on MB dye showed that oxalic acid modified rice husk gave better removal efficiency. The percentage of dye uptake increased with increasing of pH and contact time. The optimum pH for MB removal was recorded at the range of pH 4 to pH 10 and the adsorption equilibrium was achieved after the first one and a half hours of contact time. From the kinetic study, the adsorption process correlated well with pseudo-second order kinetics equation. The experimental data were fitted into different isotherm model equations and the results revealed that the system under studied is better explained by Langmuir isotherm as compared to Freundlich isotherm. The maximum sorption capacity of ORH for MB was 29.15 mg/g.

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草酸改性稻壳吸附去除亚甲基蓝的研究

研究了草酸改性稻壳(ORH)在不同条件下对水溶液中亚甲基蓝(MB)的吸附性能。研究的参数包括pH、初始染料浓度、接触时间、吸附等温线、搅拌速率和吸附剂用量。通过对天然稻壳和草酸改性稻壳对MB染料吸收率的比较研究表明，草酸改性稻壳对MB染料的去除率更高。随着pH值的增加和接触时间的延长，染料的吸收率增加。在pH 4 ~ pH 10范围内记录了MB去除的最佳pH值，并在接触时间前一个半小时后达到吸附平衡。从动力学研究来看，吸附过程符合准二级动力学方程。将实验数据拟合到不同的等温线模型方程中，结果表明Langmuir等温线比Freundlich等温线更能解释所研究的体系。ORH对MB的最大吸附量为29.15 mg/g。

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APCBEE Procedia

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