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Mechanism of ammonium adsorption from wastewater by modified bentonite and optimization by response surface
Bioremediation Journal ( IF 2 ) Pub Date : 2018-03-28 , DOI: 10.1080/10889868.2018.1445696
Rongtai Yu 1 , Jiancai Zhou 1 , Zhipeng Xie 2 , Changan Wang 2 , Xiang Ma 1
Affiliation  

ABSTRACT Three modified bentonites, dry alkali modification, thermal modification, and acid modification, were prepared and characterized by XRD and FTIR. Batch experiments were performed to evaluate their efficiency as adsorbent for ammonium removal. Multi-variables interaction effects were evaluated by Response Surface Methodology. The results showed that the adsorption efficiency of ammonium by dry alkali modification bentonite was the best in three modified methods; the next was that of thermal modification. The crystalline structure of bentonite was significantly changed with dry alkali modification. Na2SiO3 and Na2AlSi3O8(OH) were achieved by bentonite with powder NaOH modification. The increase in the mole ratio of exchangeable cations indicated that the adsorption efficiency of ammonium increased; while the layer spacing of bentonite expanded with the amount of the adsorbed water and hydrated water increased by thermal modification. In multi-variables interaction effects (holding time, calcination temperature, pH, dosage), the most significant factors were calcination temperature and dosage.

中文翻译:

改性膨润土吸附废水氨氮机理及响应面优化

摘要制备了三种改性膨润土,即干碱改性、热改性和酸改性,并通过 XRD 和 FTIR 对其进行了表征。进行批量实验以评估它们作为吸附剂去除铵的效率。多变量相互作用效应通过响应面方法进行评估。结果表明,三种改性方法中干碱改性膨润土对铵盐的吸附效率最好;接下来是热改性。膨润土的晶体结构随着干碱改性发生显着变化。Na2SiO3 和 Na2AlSi3O8(OH) 是由膨润土粉 NaOH 改性得到的。可交换阳离子摩尔比的增加表明铵的吸附效率增加;而膨润土的层间距随着吸附水和水化水的增加而扩大。在多变量交互作用(保温时间、煅烧温度、pH、用量)中,最显着的因素是煅烧温度和用量。
更新日期:2018-03-28
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