Adsorption Isotherm And Kinetic Models For Removal Of Methyl Orange And Remazol Brilliant Blue R By Coconut Shell Activated Carbon

Hee Tian Hii
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引用次数: 29

Abstract

Adsorption technology is one of the efficient and facile method used for wastewater treatment. In this research, coconut shell, an agricultural solid waste was converted into activated carbon via furnace induced and zinc chloride chemical activation techniques. The activated carbon was prepared at activation temperature of 600°C. Anionic dyes, Methyl Orange (MO) and Remazol Brilliant Blue R (RBBR) have been selected due to their harmful effect to the environmental and human. Various effect of parameter such as initial dye concentration, initial pH, adsorbent dosage and agitation speed in batch system were investigated to obtain the optimum condition for both dye adsorption on activated carbon. The optimum dye removal efficiency was around 99% when 5g/L of activated carbon was used. Pseudo-second-order model was the best fitted model with highest correlation compared to other kinetic models. The adsorption behaviour of MO was perfectly presented by the Freundlich model while RBBR was well described by Langmuir model. The maximum adsorption capacity for MO was 59.17mg/g and RBBR was 35.09mg/g. Fourier-transform infrared spectroscopy (FTIR) was utilised to analyse the chemical characteristics of activated carbon before and after adsorption.
椰壳活性炭去除甲基橙和雷马唑亮蓝R的吸附等温线及动力学模型
吸附技术是一种高效、简便的污水处理方法。以农业固体废弃物椰壳为原料,采用炉致活化和氯化锌化学活化两种工艺将其转化为活性炭。在600℃的活化温度下制备活性炭。阴离子染料甲基橙(MO)和雷玛佐亮蓝R (RBBR)对环境和人体有害,因此选择了它们。考察了初始染料浓度、初始pH、吸附剂用量、搅拌速度等参数对活性炭吸附两种染料的最佳条件的影响。当活性炭用量为5g/L时,最佳去除率为99%左右。拟二阶模型与其他动力学模型相比拟合最佳,相关性最高。Freundlich模型很好地描述了MO的吸附行为,Langmuir模型很好地描述了RBBR的吸附行为。MO的最大吸附量为59.17mg/g, RBBR的最大吸附量为35.09mg/g。利用傅里叶变换红外光谱(FTIR)对活性炭吸附前后的化学特性进行了分析。
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