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废玻璃/铝渣人工沸石对水中Ca2+的吸附特性
Aqueous calcium ion adsorption performance of artificial zeolite made from waste glass and aluminum slag
投稿时间:2018-06-20  修订日期:2018-10-29
DOI:
中文关键词:  硬水软化  人工沸石  吸附  Ca2+  热力学  动力学
英文关键词:hard water softening  artificial zeolite  adsorption  calcium ion  thermodynamics  dynamics
基金项目:国家重点研发计划
作者单位E-mail
张亚峰 中钢集团鞍山热能研究院有限公司 1049475060@qq.com 
安路阳 中钢集团鞍山热能研究院有限公司 anluyang2008@126.com 
尚书 中钢集团鞍山热能研究院有限公司 shangshu0112@163.com 
宋迪慧 中钢集团鞍山热能研究院有限公司 756752117@qq.com 
张立涛 中钢集团鞍山热能研究院有限公司 15040786507@163.com 
徐歆未 中钢集团鞍山热能研究院有限公司 849636667@qq.com 
马红超 大连工业大学 m-h-c@sohu.com 
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中文摘要:
      利用废玻璃和铝渣制备沸石,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。
英文摘要:
      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.
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