Institute of Environmental Engineering and Management, Mehran University of Engineering and Technology, Jamshoro, 76090, Sindh, Pakistan.
College of Plant Sciences and Technology, Huazhong Agricultural University, Wuhan, 430070, People's Republic of China.
Sci Rep. 2022 Oct 14;12(1):17207. doi: 10.1038/s41598-022-21275-4.
Selenium in wastewater is of particular concern due to its increasing concentration, high mobility in water, and toxicity to organisms; therefore, this study was carried out to determine the removal efficiency of selenium using iron and manganese-based bimetallic micro-composite adsorbents. The bimetallic micro-composite adsorbent was synthesized by using the chemical reduction method. Micro-particles were characterized by using energy-dispersive X-ray spectroscopy for elemental analysis after adsorption, which confirms the adsorption of selenium on the surface of the micro-composite adsorbent, scanning electron microscopy, which shows particles are circular in shape and irregular in size, Brunauer-Emmett-Teller which results from the total surface area of particles were 59.345m/g, Zeta particle size, which results from average particles size were 39.8 nm. Then it was applied to remove selenium ions in an aqueous system. The data revealed that the optimum conditions for the highest removal (95.6%) of selenium were observed at pH 8.5, adsorbent dosage of 25 mg, and contact time of 60 min, respectively, with the initial concentration of 1 ppm. The Langmuir and Freundlich isotherm models match the experimental data very well. The results proved that bimetallic micro-composite could be used as an effective selenium adsorbent due to the high adsorption capacity and the short adsorption time needed to achieve equilibrium. Regarding the reusability of bimetallic absorbent, the adsorption and desorption percentages decreased from 50 to 45% and from 56 to 53%, respectively, from the 1st to the 3rd cycle.
废水中的硒尤其令人关注，因为它的浓度不断增加、在水中的迁移性高、对生物体有毒性；因此，本研究旨在使用铁锰基双金属微复合材料吸附剂来确定硒的去除效率。双金属微复合材料吸附剂是通过化学还原法合成的。吸附后，通过能量色散 X 射线光谱法对微复合材料吸附剂表面进行元素分析，确认硒被吸附在微复合材料吸附剂表面上，通过扫描电子显微镜观察到粒子呈圆形且大小不规则，通过 Brunauer-Emmett-Teller 法得出的粒子总表面积为 59.345m/g，通过 Zeta 粒径法得出的平均粒径为 39.8nm。然后将其应用于去除水溶液中的硒离子。数据表明，在 pH 值为 8.5、吸附剂用量为 25mg、接触时间为 60min 的最佳条件下，硒的去除率最高（95.6%），初始浓度为 1ppm。Langmuir 和 Freundlich 等温模型非常吻合实验数据。结果证明，双金属微复合材料可以作为一种有效的硒吸附剂，因为它具有高吸附容量和达到平衡所需的短吸附时间。关于双金属吸收剂的可重复使用性，从第 1 到第 3 个循环，吸附和解吸百分比分别从 50%下降到 45%和从 56%下降到 53%。
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