Nitrilotriacetic acid modified bamboo charcoal (NTA-MBC): An effective adsorbent for the removal of Cr (III) and Cr (VI) from aqueous solution
Nitrilotriacetic acid modified bamboo charcoal (NTA-MBC): An effective adsorbent for the removal of Cr (III) and Cr (VI) from aqueous solution
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DOI：
10.1016/j.jece.2018.04.045
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发表时间：
2018-04
影响因子：
7.7
通讯作者：
S. Saini;S. Arora;Kirandeep;B. Singh;J. K. Katnoria;I. Kaur
中科院分区：
文献类型：
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作者：
S. Saini;S. Arora;Kirandeep;B. Singh;J. K. Katnoria;I. Kaur
采用氨三乙酸（NTA）作为螯合剂对竹炭进行表面改性。采用次氮三乙酸改性竹炭（NTA-MBC）作为吸附剂去除水溶液中的三价和六价铬。使用各种参数如pH、接触时间、吸附剂剂量、初始金属离子浓度和温度进行批模式吸附研究。吸附数据进行了分析，使用Langmuir，Freundlich和Temkin等温线。从Langmuir等温线得到的NTA-MBC的最大吸附容量被发现是1000 mg/g的Cr（III）在pH 3与吸附剂剂量为1 g/l和270 mg/g的Cr（VI）在pH 3与吸附剂剂量为2 g/l。吸附Cr（III）和Cr（VI）的热力学研究表明，吸附过程的性质是自发和吸热的性质。NTA-MBC对Cr（III）和Cr（VI）的吸附能力增强的主要原因是NTA与竹炭表面的Cr（III）和Cr（VI）形成了1：1或1：2的络合物。吸附过程符合准二级动力学模型。利用SEM、BET、FT-IR等手段对NTA-MBC的表面特征进行了表征，并通过对NTA-MBC的柱性能研究，考察了其在水净化中的应用，结果表明NTA-MBC是一种很有前途的净水厂柱填料。
In the present study, nitrilotriacetic acid (NTA) was used as a chelating agent for surface modification of bamboo charcoal (BC). Nitrilotriacetic acid modified bamboo charcoal (NTA-MBC) was applied as an adsorbent for the removal of trivalent and hexavalent chromium from aqueous solution. Batch mode adsorption studies were performed using various parameters such as pH, contact time, adsorbent dose, initial metal ion concentration and temperature. The adsorption data were analyzed using Langmuir, Freundlich and Temkin isotherms. Maximum adsorption capacity of NTA-MBC obtained from Langmuir isotherm was found to be 1000 mg/g for Cr (III) at pH 3 with adsorbent dose of 1 g/l and 270 mg/g for Cr (VI) at pH 3 with adsorbent dose of 2 g/l. Thermodynamic studies of adsorption of both Cr (III) and Cr (VI) indicated that the nature of adsorption process was spontaneous and endothermic in nature. Enhanced adsorption capacity of NTA-MBC can be attributed to the formation of 1:1 or 1:2 complexes by NTA present on the surface of bamboo charcoal with Cr (III) and Cr (VI) in aqueous solution. The adsorption phenomenon was observed to follow pseudo second order kinetics model. The surface characteristics of NTA-MBC were examined using SEM, BET and FT-IR. The NTA-MBC was also examined for its application in purification of water through the column studies and observed to be a promising material for packing of columns in water treatment plants.