Enhanced adsorption of Cd(II) from aqueous solution by a magnesium oxide-rice husk biochar composite
Enhanced adsorption of Cd(II) from aqueous solution by a magnesium oxide-rice husk biochar composite
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氧化镁-稻壳生物炭复合材料增强水溶液中 Cd(II) 的吸附
DOI：
10.1007/s11356-018-1594-1
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发表时间：
2018-05-01
影响因子：
5.8
通讯作者：
Liu, Dingfa
中科院分区：
文献类型：
--
作者：
Xiang, Jiangxin;Lin, Qintie;Liu, Dingfa
采用氧化镁浸渍法制备了氧化镁-稻壳生物炭复合材料（MgO-BCR），并研究了其对Cd（II）的吸附性能。BCR和MgO-BCR对Cd（II）的吸附符合准二级动力学模型，而吸附等温线符合Langmuir吸附等温式。单层模型的拟合结果表明，每个站点捕获的离子数在0.97和1.09之间变化。计算的热力学参数表明，MgO-BCR对Cd（II）的吸附是自发的吸热过程。吸附剂的表征表明，在原位沉淀，表面络合，和静电吸引的Cd（II）吸附。稻壳生物炭（BCR）和MgO-BCR对Cd（II）的吸附容量分别达到6.36和18.1 mg/g。结果表明，MgO-BCR复合材料可作为一种高效、环保的吸附剂，提高水溶液中Cd（II）的去除率。
In this study, a magnesium oxide-rice husk biochar composite (MgO-BCR) was successfully prepared by a MgO impregnation method, and its adsorption performance was investigated in Cd(II) aqueous solution. A pseudo-second-order kinetic model described the Cd(II) adsorption behaviour on BCR and MgO-BCR well, while a Langmuir adsorption isotherm was more suitable for Cd(II) adsorption on the adsorbent. The fitting results of the monolayer model indicated that the number of ions captured by per site varied between 0.97 and 1.09. The calculated thermodynamic parameters indicated that Cd(II) adsorption onto MgO-BCR was spontaneous and endothermic. Characterisation of the adsorbent revealed that in situ precipitation, surface complexation, and electrostatic attraction contributed to the Cd(II) adsorption. The adsorption capacities of rice husk biochar (BCR) and MgO-BCR for Cd(II) reached 6.36 and 18.1 mg/g, respectively. The results demonstrated that MgO-BCR composite could be used as an effective and eco-friendly adsorbent to enhance the removal of Cd(II) from aqueous solution.