| 磷酸活化茶渣生物炭对铅的吸附性能影响和吸附机理研究 |
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| 引用本文： | 刘爽,汪东风,徐莹.磷酸活化茶渣生物炭对铅的吸附性能影响和吸附机理研究[J].中国海洋大学学报(自然科学版),2022,52(1):56-64. |
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| 作者姓名： | 刘爽 汪东风 徐莹 |
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| 作者单位： | 中国海洋大学食品科学与工程学院,山东 青岛 266003 |
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| 基金项目： | 国家重点研究发展计划项目(2019YFD0901703)资助。 |
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| 摘 要： | 为综合利用工业茶渣,并探明磷酸浓度对生物炭表面特性及铅吸附性能的影响,本文以工业茶渣制备的生物炭为研究对象,通过SEM、FTIR、XPS、XRD等表征手段和吸附动力学、吸附热力学模型拟合等吸附实验研究了不同磷酸浓度下生物炭的表面特性和铅吸附性能。研究表明,当磷酸浓度为50%时生物炭羧基和偏磷酸基团含量最高,不溶性晶体分解最完全,对Pb(II)有最佳吸附性能,最大吸附容量达到188.68 mg·g-1,且经盐酸解吸后可多次循环使用。其吸附机理主要为表面络合和沉淀。研究结果表明,浓度50%的磷酸对生物炭具有最佳的活化效果,磷酸活化茶渣生物炭对铅具有优异的吸附性能。
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| 关 键 词： | 工业茶渣 生物炭 磷酸活化 铅 吸附 |
Studies on Lead Adsorption Performance of Phosphoric Acid Activated Tea Residue Biochar and Associating Mechanism |
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| Liu Shuang,Wang Dongfeng,Xu Ying.Studies on Lead Adsorption Performance of Phosphoric Acid Activated Tea Residue Biochar and Associating Mechanism[J].Periodical of Ocean University of China,2022,52(1):56-64. |
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| Authors: | Liu Shuang Wang Dongfeng Xu Ying |
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| Institution: | (College of Food Science and Engineering, Ocean University of China, Qingdao 266003, China) |
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| Abstract: | In this study,biochar prepared from industrial tea residue was taken as the research object.The effect of phosphoric acid concentration on the surface characteristics of biochar and the adsorption performance of lead were studied with SEM,FTIR,XPS,XRD and adsorption kinetics and thermodynamic model fitting.The results showed that when the concentration of phosphoric acid was 50%,biochar had the highest and most abundant carboxylic group and metaphosphate group and the insoluble crystals were decomposable most completely.The biochar had the best adsorption performance for Pb(II)and the maximum adsorption capacity reached 188.68 mg·g-1.After hydrochloric acid desorption,it can be recycled for three times.Its adsorption mechanism was mainly surface complexation and precipitation.The results can provide a scientific basis for the comprehensive utilization of industrial tea waste. |
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| Keywords: | industrial tea residue biochar phosphoric acid activation lead adsorption |
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