Adsorption of Methylene Blue dye and Cu(II) ions on EDTA-modified bentonite: Isotherm, kinetic and thermodynamic studies
Adsorption of Methylene Blue dye and Cu(II) ions on EDTA-modified bentonite: Isotherm, kinetic and thermodynamic studies
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DOI：
10.1016/j.serj.2018.04.001
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发表时间：
2018-09-01
影响因子：
4.9
通讯作者：
de Luna, Mark Daniel G.
中科院分区：
文献类型：
--
作者：
De Castro, Maria Leah Flor A.;Abad, Melody Love B.;de Luna, Mark Daniel G.
染料和金属是工业废水中常见的危险污染物，需要复杂和昂贵的去除技术。本研究探讨了乙二胺四乙酸改性菲律宾膨润土（EMB）作为一种低成本的吸附材料，用于去除亚甲基蓝染料（MB）和铜离子（Cu（II））从水溶液中的潜力。批吸附实验表明，EMB具有上级吸附能力相比，未改性膨润土，与MB的增强高达40%，Cu（II）的100%以上。EMB的吸附能力随溶液pH值的增加和接触时间的延长而增强，随溶液温度的升高和溶液中盐浓度的增加而降低。Langmuir等温模型被发现最好地描述MB和Cu（II）的吸附EMB的最大容量为160和27毫克g（-1），分别。准二级动力学模型与实验数据拟合最好，R-2 > 0.99。热力学研究证实了吸附过程是自发的、放热的、可逆的。(C)2018中国环境工程学会，台湾。制作和主办：Elsevier B. V.
Dyes and metals are hazardous pollutants commonly found in industrial wastewaters requiring complex and expensive removal technologies. This study investigated the potential of ethylenediaminetetraacetic acid-modified Philippine bentonite (EMB) as a low-cost adsorbent material for the removal of Methylene Blue dye (MB) and copper ions (Cu(II)) from aqueous solutions. Batch adsorption experiments showed that EMB has superior adsorption capacity compared to the unmodified bentonite, with an enhancement of up to 40% for MB and more than 100% for Cu(II). The adsorption capacity of EMB improved with increasing solution pH and contact time and decreased with higher solution temperature and higher salt concentration in solution. The Langmuir isotherm model was found to best describe MB and Cu(II) adsorption on EMB with maximum capacity of 160 and 27 mg g(-1), respectively. The pseudo-second order kinetic model best fit the experimental data with R-2 > 0.99. Lastly, the thermodynamic study confirmed that the adsorption process was spontaneous, exothermic and reversible. (C) 2018 Chinese Institute of Environmental Engineering, Taiwan. Production and hosting by Elsevier B.V.