硫、氧和锰共掺杂碳纳米管对磷酸中铅离子的吸附和分离

IF 5.9 3区 工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY
Gang Cheng, Xin Zhou, Chongyu Du, Guotao Hu, Qian Lin, Hongyan Pan
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引用次数: 0

摘要

本研究旨在制备一种新型高效吸附剂,用于去除磷酸中的痕量铅(II)。用硝酸、巯基乙酸、乙酸酐、浓硫酸和高锰酸钾修饰的多壁碳纳米管制备了氧化锰/硫氧掺杂碳纳米管复合材料(CNTs-S-O-Mn)。表征结果表明,CNTs-S-O-Mn 含有羟基、磺酸基、氧化锰和氧化锰。在 298 K、铅离子初始浓度为 15.362 mg-L 和磷酸浓度为 18.4 % 的条件下,复合材料对铅离子的吸附容量为 38.65 mg-g,高于未改性 CNT 的 8.04 mg-g。298 K 时的吸附动力学数据符合准二阶动力学方程,R = 0.997;298、308 和 318 K 时的吸附等温线符合 Langmuir 方程,R = 0.990--0.991。吸附容量随磷酸浓度的降低而增加。在该体系中,吸附受一定浓度的铅离子影响。吸附是通过化学吸附发生的,并且是放热的。锰氧化物上的磺酸基团和羟基通过与铅(II)的表面络合,在吸附铅(II)的过程中发挥了重要作用。这些结果表明,用改性碳纳米管去除磷酸中的痕量铅(II)是可行的,揭示了碳纳米管在磷酸净化中的新用途。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Adsorption and separation of lead ions in phosphoric acid by co-doped carbon nanotubes with sulfur, oxygen, and manganese

Adsorption and separation of lead ions in phosphoric acid by co-doped carbon nanotubes with sulfur, oxygen, and manganese
The purpose of this study was to prepare a novel and efficient adsorbent for the removal of trace Pb(II) from phosphoric acid. Manganese oxide/sulfur-oxygen doped carbon nanotube composites (CNTs-S-O-Mn) were prepared from multi-walled carbon nanotubes modified with nitric acid, mercaptoacetic acid, acetic anhydride, concentrated sulfuric acid and potassium permanganate. Characterisation revealed that CNTs-S-O-Mn contained hydroxyl, sulphonate groups, MnO and MnO. At 298 K, 15.362 mg·L initial concentration of lead ions, and 18.4 % phosphoric acid concentration, the adsorption capacity of the composites for lead ions was 38.65 mg·g, which was higher than that of the unmodified CNTs, 8.04 mg·g. The adsorption kinetic data at 298 K conformed to the quasi-second-order kinetic equation, R = 0.997; 298, adsorption isotherms at 308 and 318 K conformed to the Langmuir equation, R = 0.990–––0.991. The adsorption capacity increased with decreasing phosphoric acid concentration. In this system, the adsorption is affected by a certain concentration of lead ions. Adsorption occurs via chemisorption and is exothermic. Sulfonic acid groups and hydroxyl groups on manganese oxides play an important role in the adsorption of Pb (II) through surface complexation with Pb (II). These results indicate that the removal of trace Pb (II) from phosphoric acid by modified carbon nanotubes is feasible, revealing a new use of carbon nanotubes for phosphoric acid purification.
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来源期刊
CiteScore
10.40
自引率
6.60%
发文量
639
审稿时长
29 days
期刊介绍: Journal of Industrial and Engineering Chemistry is published monthly in English by the Korean Society of Industrial and Engineering Chemistry. JIEC brings together multidisciplinary interests in one journal and is to disseminate information on all aspects of research and development in industrial and engineering chemistry. Contributions in the form of research articles, short communications, notes and reviews are considered for publication. The editors welcome original contributions that have not been and are not to be published elsewhere. Instruction to authors and a manuscript submissions form are printed at the end of each issue. Bulk reprints of individual articles can be ordered. This publication is partially supported by Korea Research Foundation and the Korean Federation of Science and Technology Societies.
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