Investigation of adsorption behavior of methylene blue on acid leaching residue of asbestos tailing

doi:10.16085/j.issn.1000-6613.2015.07.039

Abstract

Abstract: This research characterized calcined acid leaching residue of asbestos tailing (CAAT) using XRD and FT-IR, and investigated the adsorption behaviors of methylene blue(MB) on AAT. Batch experiments were conducted to analyze the effects of the solid amount, contact time, pH, temperature and ionic strength on the adsorption of MB. The results indicated that the adsorption of MB strongly depended on pH, ionic strength and temperature. At pH<4.5, the adsorption capacity increased with the increasing of pH; at pH≥4.5, the adsorption capacity was not affected by the increasing pH. The adsorption capacity decreased with increasing ionic strength. The thermodynamic calculations indicated that the adsorption process was endothermic and spontaneous. The adsorption of MB on the acid leaching residue of asbestos tailing was consistent with pseudo-second-order kinetic model and Langmuir model.

Key words: asbestos tailing, acid leaching residue, methylene blue, adsorption

摘要： 采用XRD、FT-IR等手段分别对石棉尾矿和石棉尾矿酸浸渣进行表征。利用活化煅烧的石棉尾矿酸浸渣对亚甲基蓝(MB)进行静态吸附研究, 探讨了吸附剂投加量、吸附时间、pH值、离子强度和温度等因素对吸附作用的影响。结果表明:pH值、离子强度和温度对亚甲基蓝在石棉尾矿酸浸渣上的吸附影响较大。当pH<4.5时, 吸附量随着pH值的增大而增大, 随后pH值增大, 吸附量基本不变;亚甲基蓝在石棉尾矿酸浸渣上的吸附随离子强度的增大而降低;通过相关热力学研究计算吸附过程为吸热过程, 即高温利于吸附;亚甲基蓝在石棉尾矿酸浸渣上的吸附动力学符合Lagrange准二级方程;热力学符合Langmuir等温线方程。

关键词: 石棉尾矿, 酸浸渣, 亚甲基蓝, 吸附

CLC Number:

TQ170.9

HU Chunlian, CHEN Yuantao, ZHANG Wei, WANG Jian. Investigation of adsorption behavior of methylene blue on acid leaching residue of asbestos tailing[J]. Chemical Industry and Engineering Progree, 2015, 34(07): 2043-2048.

胡春联, 陈元涛, 张炜, 王建. 亚甲基蓝在石棉尾矿酸浸渣上的吸附行为[J]. 化工进展, 2015, 34(07): 2043-2048.

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