摘要
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。
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.
作者
申晓毅
黄彦翔
邵鸿媚
王媛
韩庆
陈建设
李斌川
翟玉春
Xiao-yi SHEN;Yan-xiang HUANG;Hong-mei SHAO;Yuan WANG;Qing HAN;Jian-she CHEN;Bin-chuan LI;Yu-chun ZHAI(Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),School of Metallurgy,Northeastern University,Shenyang 110819,China;Liaoning Key Laboratory for Metallurgical Sensor and Technology,Northeastern University,Shenyang 110819,China;School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,China)
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)
