Faujasite沸石纳米棒的合成及其对重金属的吸附  

Synthesis of Nanorod Faujasite Zeolite and Its Adsorption for Heavy Metals

作　　者：陈晨 侯宝炫 辛欣 周润 田园 温明月 CHEN Chen;HOU Bao-xuan;XIN Xin;ZHOU Run;TIAN Yuan;WEN Ming-yue(School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212018,Jiangsu,China)

机构地区：[1]江苏科技大学环境与化学工程学院,江苏镇江212018

出　　处：《有色金属（冶炼部分）》2023年第5期81-91,共11页Nonferrous Metals（Extractive Metallurgy)

基　　金：镇江市2021年重点研发项目(社会发展SH2021020)。

摘　　要：通过优化水热合成条件成功合成出具有八面纳米棒形貌的Faujasite沸石材料(长度300~900 nm,截面宽度20~50 nm),该材料的理论分子式为Na_(14)Al_(12)Si_(13)O_(51)·6H_(2)O。将此沸石材料用于溶液中重金属离子的吸附研究,结果表明:该沸石材料对Cu^(2+)、Cd^(2+)、Pb^(2+)和Ni^(2+)的极限吸附量分别为250、323、1 075和256 mg/g。吸附过程在开始后的100分钟内达到吸附平衡,溶液pH的提高可以促进表观吸附。准二级动力学方程和Langmuir吸附等温线能够良好地拟合沸石材料对四种重金属离子的吸附过程。DFT模型计算结果显示,各重金属吸附构型的稳定性和吸附过程发生的趋势顺序均为Pb>Cd>Ni>Cu。Through the optimization of hydrothermal synthesis conditions,Faujasite zeolite materials with octahedral nanorod morphology(micro length of 300-900 nm,cross-section length of 20-50 nm)were successfully synthesized.The theoretical molecular formula of material of Na_(14) Al_(12) Si_(13) O_(51)·6H_(2)O.The zeolite material was applied to adsorb heavy metals in solution.The results illustrate that the ultimate adsorption capacity of Cu ^(2+),Cd ^(2+),Pb ^(2+)and Ni ^(2+)is 250,323,1075 and 256 mg g,respectively.The adsorption process can reach saturation within 100 minutes,and the increase of pH value of solution can accelerate the improvement of apparent adsorption effect.The quasi-second-order kinetic equation and Langmuir adsorption isotherm can be used to fit the adsorption process of four heavy metal ions by zeolite.The calculation results of DFT display that the stability of adsorption configuration of each heavy metal and the trend sequence of the adsorption process are Pb>Cd>Ni>Cu.

关 键 词：Faujasite沸石 纳米棒 重金属 吸附 

分 类 号：X52[环境科学与工程—环境工程]