化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (3) : 216-220.

科学研究

改性钾长石的制备及其对Ni²⁺的吸附研究

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Preparation of modified K-feldspar and Ni²⁺ adsorption

Xu Man ,Zhang Ting, Li Xinyong ,Li Ling

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摘要

通过在钾长石中掺加钙复合助剂对其进行焙烧改性制备Ni²⁺吸附材料(MKf),由正交试验得到最佳制备条件并对其进行表征,考察MKf添加量、初始pH、振荡时间、初始浓度对MKf吸附Ni²⁺的影响。结果表明:MKf最佳制备条件为CaSO₄0.08g,CaCO₃0.3g,焙烧温度900℃,焙烧时间3h;MKf呈棒状结构,并有新物相CaSiO₃生成;在初始Ni²⁺浓度为200mg/L,MFf添加量为0.2g,初始pH为4,室温吸附24h条件下,MKf对Ni²⁺的吸附率达到99.3%;吸附过程符合准一级动力学模型,吸附速率主要受颗粒内扩散和吸附反应控制;Langmuir等温模型能更好地描述MKf的吸附行为,最大吸附量为14.973mg/g,较改性前提高了4倍左右。

Abstract

Ni²⁺ adsorbent(MKf) was prepared by calcining k-feldspar with calcium compound additive.The optimal conditions obtained by the orthogonal experiment and MKf were characterized.The effects of MKf on Ni²⁺ adsorption,including MKf addition,initial pH,oscillation time and initial concentration were discussed.The results indicated that the optimal preparation conditions were as follows:CaSO₄ mass of 0.08g,CaCO₃ mass of 0.3g,the roasting temperature of 900℃,the roasting time of 3h.MKF presented rodlike structure and showed new phase CaSiO₃.The adsorption rate of MKF to Ni²⁺ could reach 99.3% under the conditions of initial Ni²⁺ concentration of 200mg·L^-1,MKf addition of 0.2g,the initial pH of 4,the adsorption time of 24h under room temperature.The Adsorption process fited the pseudo-first-order kinetic model and the adsorption rate was mainly controlled by intra-particle diffusion and adsorption reaction.The adsorption behavior of MKf can be adequately described by langmuir isothermal model.The maximum adsorption capacity was 14.973mg·g^-1,which was improved about four times over that before modification.

关键词

钙复合助剂 / 钾长石 / Ni²⁺ / 吸附

Key words

calcium compound additive / K-feldspar / Ni²⁺ / adsorption

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改性钾长石的制备及其对Ni²⁺的吸附研究[J]. 化工新型材料, 2019, 47(3): 216-220 DOI:

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