煤矸石制备沸石分子筛及其对酸性废水中Cu^(2+)的吸附性能  

Preparation of Molecular Sieve from Coal Gangue and Adsorption Performance for Cu^(2+)in Acid Wastewater

作　　者：张伟 亓欣[1] 苗英威 吕发奎[1] 陈政 李凤刚[1] 张继柱 ZHANG Wei;QI Xin;MIAO Yingwei;LV Fakui;CHEN Zheng;LI Fenggang;ZHANG Jizhu(College of Chemistry,Chemical Engineering and Materials Science,Zaozhuang University,Zaozhuang 277160,Shandong,China;Shandong Industrial Technology Research Institute of Zhejiang University,Zaozhuang 277500,Shandong,China)

机构地区：[1]枣庄学院化学化工与材料科学学院,山东枣庄277160 [2]浙江大学山东工业技术研究院,山东枣庄277500

出　　处：《矿产保护与利用》2023年第5期120-126,共7页Conservation and Utilization of Mineral Resources

基　　金：枣庄市科技发展计划项目(2022GX09);枣庄学院博士科研启动资金项目(08-1020746)。

摘　　要：煤矸石中富含SiO_(2)和Al_(2)O_(3),可作为制备沸石分子筛的原料。对枣庄矿业集团煤矸石进行低温氧化、酸浸除杂和高温煅烧,再加以碱熔二次活化等预处理后,进行水热合成反应,制备了沸石分子筛。通过X射线衍射(XRD)、扫描电镜(SEM)、傅里叶红外光谱(FT-IR)对产物晶体结构、微观形貌和骨架结构进行了表征,表明产物为形态较佳且结晶度较高的4A分子筛。将所制备分子筛用于水中Cu^(2+)的吸附,考察了分子筛用量、溶液pH值、吸附时间和温度对吸附效果的影响。结果表明在分子筛用量为6.0 g/L、pH值为5.0、吸附时间为180 min、吸附温度为40℃时,对Cu^(2+)浓度为0.01 mol/L的酸性废水中Cu^(2+)的吸附率可达89.2%。吸附动力学分析表明吸附过程符合准二级动力学方程,化学吸附在吸附过程中起主导作用。Coal gangue is rich in SiO_(2)and Al_(2)O_(3),and can be used as raw material for zeolite molecular sieve.A molecular sieve was prepared by coal gangue from Zaozhuang Mining Group,through the process of low-temperature oxidation,acid leaching,high-temperature calcination,activated by alkali melting,and further hydrothermal reaction.The crystal structure,morphology,and skeleton structure of the product were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and Fourier transform infrared spectroscopy(FT-IR)respectively.The results showed that the product was a 4A molecular sieve with good morphology and high crystallinity.The prepared molecular sieve was used for the adsorption of Cu^(2+)in aqueous solution,and the effects of molecular sieve dosage,solution pH value,adsorption time,and temperature on the adsorption effect were investigated.Adsorption experiments showed that its adsorption rate for Cu^(2+)reached 89.2%in the acid wastewater containing 0.01 mol/L of copper,when the dosage was 6.0 g/L,the pH value was 5.0,the adsorption time was 180 min,and the adsorption temperature was 40℃.The adsorption kinetics analysis showed that the adsorption process conformed to quasi second-order kinetic equation,and chemical adsorption played a dominant role in the adsorption process.

关 键 词：煤矸石 活化 水热合成 分子筛 吸附 

分 类 号：TD849.5[矿业工程—煤矿开采] TQ424[矿业工程—矿山开采]