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Adsorption of Cu (II) and Cd (II) from Wastewater by Sodium Alginate Modified Materials
Journal of Chemistry ( IF 3 ) Pub Date : 2020-08-03 , DOI: 10.1155/2020/5496712
Yingying Zhao 1 , Linchuan Zhan 1 , Zhongjun Xue 1 , Kianpoor Kalkhajeh Yusef 1 , Hongxiang Hu 1 , Mengjun Wu 1
Affiliation  

Natural macromolecule adsorbing materials are alternatives for remediation of heavy metals’ polluted waters. In this study, sodium alginate composite gel (SACL) was synthesized from sodium alginate (SA), polyethylene glycol oxide (PEO), and nanomaterials to remove wastewater Cu (II) and Cd (II). The adsorption efficiency of SACL was analysed in relation to the contact time, initial concentrations of metal ions, temperature, adsorbent dosage, and solution pH. Three models, i.e., kinetic model, isothermal adsorption model, and thermodynamic model, were used to fit the experimental data. Our results showed that the highest removal rates of Cu (II) and Cd (II) from wastewater were 96.8% and 78%, respectively, under the condition of the best liquid-solid ratio of 12.5 ml·g−1, and the contact time of 180 min (25°C). Overall, the SACL adsorption of Cu (II) and Cd (II) was spontaneous. The adsorption kinetics and the isothermal adsorption were fitted well with the pseudo-second-order kinetic equation and Langmuir equation, respectively. Combined with SEM-EDS and FTIR analysis, results suggested that SACL adsorbs wastewater Cu (II) and Cd (II) mainly through chemical reaction on its surface area. Altogether, this work concludes on SACL as an efficient and ecofriendly adsorbent for wastewater Cu (II) and Cd (II).

中文翻译:

海藻酸钠改性材料对废水中Cu(II)和Cd(II)的吸附

天然高分子吸附材料是重金属污染水体修复的替代品。本研究以海藻酸钠(SA)、聚氧化乙烯(PEO)和纳米材料为原料合成海藻酸钠复合凝胶(SACL),以去除废水中的Cu(II)和Cd(II)。分析了 SACL 的吸附效率与接触时间、金属离子初始浓度、温度、吸附剂用量和溶液 pH 值的关系。三个模型,即动力学模型、等温吸附模型和热力学模型,用于拟合实验数据。结果表明,在最佳液固比为 12.5 ml·g−1 的条件下,废水中 Cu (II) 和 Cd (II) 的最高去除率分别为 96.8% 和 78%。 180 分钟 (25°C) 的时间。全面的,Cu (II) 和 Cd (II) 的 SACL 吸附是自发的。吸附动力学和等温吸附分别符合拟二级动力学方程和朗缪尔方程。结合SEM-EDS和FTIR分析,结果表明SACL主要通过其表面积上的化学反应吸附废水Cu(II)和Cd(II)。总之,这项工作总结了 SACL 作为废水 Cu (II) 和 Cd (II) 的一种高效且环保的吸附剂。
更新日期:2020-08-03
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