Facile fabrication of spherical flower-like Mg(OH)2 and its fast and efficient removal for heavy metal ions  

花球状Mg(OH)_(2)的制备及其对重金属离子的快速高效去除

作　　者：Xiao-yi SHEN Yan-xiang HUANG Hong-mei SHAO Yuan WANG Qing HAN Jian-she CHEN Bin-chuan LI Yu-chun ZHAI 申晓毅;黄彦翔;邵鸿媚;王媛;韩庆;陈建设;李斌川;翟玉春(东北大学冶金学院多金属共生矿生态化冶金教育部重点实验室,沈阳110819;东北大学辽宁省冶金传感器及技术重点实验室,沈阳110819;沈阳理工大学环境与化学工程学院,沈阳110159)

机构地区：[1]Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),School of Metallurgy,Northeastern University,Shenyang 110819,China [2]Liaoning Key Laboratory for Metallurgical Sensor and Technology,Northeastern University,Shenyang 110819,China [3]School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第9期3149-3162,共14页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 51774070 and 52004165);the Science and Technology Project of Yunnan Province, China (No. 202101AS070029)

摘　　要：Spherical flower-like Mg(OH)_(2) was fabricated from MgSO_(4) effluent and its adsorption performance for heavy metal ions was evaluated.The appropriate fabrication conditions are as follows:Mg^(2+)/NH4OH molar ratio of 1:0.5,temperature of 120°C and time of 1 h at Mg^(2+)concentration of 2 mol/L.Spherical flower-like Mg(OH)_(2) composed of ultra-thin sheets exhibits an excellent adsorption ability for Ni^(2+),Cu^(2+),Zn^(2+),Pb^(2+),Fe^(3+)and Co^(2+),and the adsorption reaches the equilibrium in 6 min.The maximum adsorption capacities of the studied heavy metal ions onto Mg(OH)_(2) at 20°C are 58.55,85.84,44.94,485.44,625.00 and 27.86 mg/g,respectively.The adsorption is well fitted by the Langmuir model,indicating that the adsorption is monolayer.The adsorption kinetics follows the pseudo-second-order model.Chemisorption is the operative mechanism.Spherical flower-like Mg(OH)_(2) is a qualified candidate for heavy metal ions removal.由MgSO_(4)废液制备球形花状Mg(OH)_(2),并评估其对重金属离子的吸附性能。合适的制备条件为Mg^(2+)浓度2 mol/L、Mg^(2+)/NH4OH摩尔比1:0.5、温度120℃和时间1 h。由超薄片组成的球形花状Mg(OH)_(2)对重金属离子具有良好的吸附能力,6 min即可达到吸附平衡。20℃时Mg(OH)_(2)对Ni^(2+)、Cu^(2+)、Zn^(2+)、Pb^(2+)、Fe^(3+)和Co^(2+)的最大吸附量分别为58.55、85.84、44.94、485.44、625.00和27.86 mg/g。吸附过程符合Langmuir模型,为单分子层吸附。吸附动力学符合准二级动力学模型,化学吸附是其作用机制。球形花状Mg(OH)_(2)是合格的重金属离子吸附材料。

关 键 词：MgSO_(4)effluent flower-like Mg(OH)_(2) heavy metal ion adsorption 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]