Exploring and Evaluation of CaAl Hydrotalcite-like Adsorbents on Phosphate Recycling

doi:10.6023/A15070485

Acta Chim. Sinica ›› 2015, Vol. 73 ›› Issue (11): 1207-1213.DOI: 10.6023/A15070485 Previous Articles Next Articles

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CaAl类水滑石的磷酸根吸附性能及其影响因素研究

贾云生^a,b, 王火焰^a, 赵雪松^c, 刘晓伟^a,b, 王一柳^a, 范群龙^c, 周健民^a

a 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室南京 210008;
b 中国科学院大学北京 100049;
c 江苏隆昌化工有限公司江苏南通 226500

投稿日期:2015-07-15 发布日期:2015-09-15
通讯作者: 王火焰 E-mail:hywang@issas.ac.cn
基金资助:
项目受国家973项目(No. 2013CB127401)和国家自然科学基金面上项目(No. 41271309)资助.

Exploring and Evaluation of CaAl Hydrotalcite-like Adsorbents on Phosphate Recycling

Jia Yunsheng^a,b, Wang Huoyan^a, Zhao Xuesong^c, Liu Xiaowei^a,b, Wang Yiliu^a, Fan Qunlong^c, Zhou Jianmin^a

a State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008;
b University of the Chinese Academy of Sciences, Beijing 100049;
c Jiangsu Longchang Chemical Co., Ltd., Nantong 226500

Received:2015-07-15 Published:2015-09-15
Supported by:
Project supported by the National Basic Research Program of China (No. 2013CB127401) and the National Natural Science Foundation of China (No. 41271309).

We synthesized CaAl-Cl layered double hydroxide (CaAl-LDH) by co-precipitation and evaluated its performance in phosphate adsorption. Calcium fluoride (0.25 mol) and sodium meta-aluminate (0.1 mol) were poured into a beaker that contained 0.2 mol sodium hydroxide. The suspension was aged at 25 ℃ for 4 h under vigorous stirring. The acquired sludge was filtered and washed using distilled water, dried at 60 ℃, and then ground to powder for further study. Phosphate stock solution was prepared using sodium di-hydrogen phosphate, and used for adsorption kinetic and isotherm research. The impact factors (e.g., competitive anions, adsorbent dosage, and adsorption time) of phosphate removal by CaAl-LDH were researched using industrial effluents. Adsorption processes were studied in 50 mL centrifuge tubes, with shaking by a thermostatic oscillator for planned time intervals. Mixtures were filtered through a 0.22 μm membrane before analysis. Samples before and after phosphate adsorption were characterized by scanning electron microscopy to observe morphological characteristics. Thermo-gravimetry/differential scanning calorimetry was used to study the sample thermo-stability. Metal ions (e.g. calcium, aluminum) and phosphate concentration were determined by inductively coupled plasma atomic emission spectrometry. We observed a typical hydrotalcite structure in the CaAl-LDH by scanning electron microscopy, which indicates that the obtained materials are well-defined hexagonal platelet-like particles. The synthesized CaAl-LDH had good thermo-stability based on thermo-gravimetry/differential scanning calorimetry, and pyrolysis showed four mass loss stages. From batch adsorption experiments, we found that the adsorption fitted a Langmuir model (R²=0.997) very well; the maximum adsorption capacity (q_max) of 162.3 mg/g corresponded to the experimental data (166.9 mg/g), and is significantly higher than previous reports. The adsorption kinetics followed a pseudo-second-order model (R²=0.998). Additionally, co-existing competitive anions influenced phosphate adsorption in the order of CO₃^2-> SO₄^2-> NO₃^-. Adsorbent dosage and contact time could also impact CaAl-LDH phosphate adsorption capacity. CaAl-LDH in this study could be applied in the recovery and reuse of phosphate from industrial wastewater because of its outstanding performance and stability.

Key words: CaAl-Cl layered double hydroxide, phosphate, efficient adsorption, adsorption kinetics, impact factors

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Jia Yunsheng, Wang Huoyan, Zhao Xuesong, Liu Xiaowei, Wang Yiliu, Fan Qunlong, Zhou Jianmin. Exploring and Evaluation of CaAl Hydrotalcite-like Adsorbents on Phosphate Recycling[J]. Acta Chim. Sinica, 2015, 73(11): 1207-1213.

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CaAl类水滑石的磷酸根吸附性能及其影响因素研究

Exploring and Evaluation of CaAl Hydrotalcite-like Adsorbents on Phosphate Recycling

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