Preparation of Molecular Sieve from Coal Gangue and Adsorption Performance for Cu2+ in Acid Wastewater
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摘要:
煤矸石中富含SiO2和Al2O3，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Cu2+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Cu2+浓度为 0.01 mol/L的酸性废水中Cu2+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。
Abstract:Coal gangue is rich in SiO2 and Al2O3, 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 Cu2+ 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 Cu2+ 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.
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Key words:
- coal gangue /
- activation /
- hydrothermal synthesis /
- molecular sieve /
- adsorption
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表 1 煤矸石原料化学多元素分析结果
Table 1. Multi−elements analysis results of coal gangue
/% 成分 SiO2 Al2O3 Fe2O3 CaO TiO2 其他 含量 36.57 7.70 35.40 9.27 2.33 8.73 
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