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.
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Xu Man ,Zhang Ting, Li Xinyong ,Li Ling. Preparation of modified K-feldspar and Ni2+ adsorption. New Chemical Materials, 2019, 47(3): 216-220.
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