以椰壳为吸附剂,研究了温度、pH、粒径和共存阳离子等因素对其吸附亚甲基蓝的影响及吸附特性。结果表明:椰壳对亚甲基蓝吸附快速,10min内吸附量达到平衡吸附量的90%;伪二级动力学方程较好地描述了其吸附行为;吸附过程受颗粒内扩散与液膜扩散的共同影响。温度对吸附的影响较小;pH=4～12范围内椰壳对亚甲基蓝的吸附较好;亚甲基蓝初始浓度的增加、椰壳粒径的减小以及共存阳离子的存在,均有利于提高其对亚甲基蓝的吸附量。
The adsorption characteristics of methylene blue (MB) from aqueous solution onto coconut shell (CS) were investigated by parameters such as temperature,solution pH,particle size and competitive cation.The results indicated that CS adsorbed MB in a short time and the adsorption achieved 90% of equilibrium absorption in 10 minutes.The kinetic experimental results were best adjusted to the pseudo second order model.The results showed that the sorption process was influenced and controlled by intra-particle diffusion and liquid film diffusion.The temperature had less influence on adsorption for CS.The CS adsorbed MB effectively from wastewater at pH=4～12.The increasing of MB initial concentration,the decreasing of CS particle size and the existing of cation were in favour of improving the adsorption capacity of MB onto CS.
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基金资助
广东省自然科学基金(2015A030313640);广东省大学生创新训练计划项目(201410582029)
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