DOC《废玻璃/铝渣人工沸石对水中Ca2+的吸附》

废玻璃/铝渣人工沸石对水中Ca2+的吸附 张亚峰1,安路阳1,*,尚书1,宋迪慧1,张立涛1,徐歆未1,马红超2 1.

中钢集团鞍山热能研究院有限公司环境工程院士专家工作站,鞍山114044 2. 大连工业大学轻工与化学工程学院,大连116034 第一作者:张亚峰(1990―),男,硕士,助理工程师.研究方向:高浓度难降解废水处理及土壤修复.E-mail:[email protected] *通信作者:安路阳(1985―),男,硕士,工程师.研究方向:高浓度难降解化工废水处理技术.E-mail:[email protected] 基金项目:国家重点研发计划(2017YFB0603500) 收稿日期:2018-06-20;

录用日期:2018-11-02 DOI 10.12030/j.cjee.201806101 中图分类号X703 文献标识码 A 摘要 利用废玻璃和铝渣制备沸石,进而表征沸石结构特征并研究其对水中Ca2+的吸附性能.采用批式实验考察不同温度下沸石用量、初始pH、振荡频率、接触时间对吸附量的影响,并研究吸附过程热力学、动力学特征.结果表明,吸附量随沸石用量增加而减小、随接触时间延长而增大.初始pH和振荡频率对吸附量影响较显著.温度变化对平衡吸附量影响不大,但升高温度可显著缩短吸附平衡时间.最佳工艺参数为:沸石用量20 g・L-1,初始pH 5~8,振荡频率150 r・min-1,接触时间60 min,此时吸附量约16 mg・g-1.Langmuir等温线最符合沸石吸附水中Ca2+过程,表明该过程是均质单分子层吸附.动力学特征最符合准二级动力学方程,证实该过程主要受离子交换、颗粒外液膜扩散和颗粒内扩散控制.该沸石对水中Ca2+吸附过程是物理吸附和化学吸附并存的自发、吸热、熵增过程.该沸石可较好地去除水中Ca2+,因此具有一定软化硬水能力. 关键词 硬水软化;

人工沸石;

水中Ca2+吸附;

二级动力学 Aqueous calcium ion adsorption performance of artificial zeolite made from waste glass and aluminum slag ZHANG Yafeng1, AN Luyang1, *, SHANG Shu1, SONG Dihui1, ZHANG Litao1, XU Xinwei1, MA Hongchao2 1.Environmental Engineering Academician Experts Workstation, Sinosteel Anshan Research Institute of Thermo-Energy Co. Ltd., Anshan 114044, China 2. School of Light Industry &

Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China *Corresponding author, E-mail: [email protected] Abstract The zeolite was made from waste glass and aluminum slag. Its structure was characterized and its adsorption of calcium ion in water was studied. At different temperatures, the impacts of zeolite'

s dosage, initial pH, vibrating frequency and contact time on the adsorption capacity were investigated by batch experiments. The thermodynamic and kinetic characteristics of their adsorption processes were studied. The results show that the adsorption capacity decreases with the increase of the zeolite'

s dosage, and increases with the extension of contact time;

both the initial pH and the vibrating frequency have significant effects as well. Although the temperature has little effect on the equilibrium adsorption capacity, higher temperature could significantly shorten the adsorption equilibrium time. Under the optimal process condition (the zeolite'

s dosage at

20 g・L-1, initial pH at 5~8, vibrating frequency at

150 r・min-1, contact time at

60 min), the adsorption capacity is approximately

16 mg・g-1. The calcium ion adsorption process of the zeolite conformes well to the Langmuir isotherm, indicating a homogeneous monolayer adsorption. The dynamic data fits well to the pseudo-second-order kinetic model, demonstrating a process mainly dominated by ion exchange, extra-particle liquid membrane diffusion and intra-particle diffusion. The adsorption process is endothermic, entropy-increasing and spontaneous, with the coexistence of physisorption and chemisorption. With the capability of efficient removal of calcium ion from water, the zeolite could be used to soften hard water. Keywords hard water softening;