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Removal of aqueous-phase lead ions by dithiocarbamate-modified hydrochar.
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.scitotenv.2020.136897 Bing Li 1 , Jian-Zhong Guo 1 , Jia-Lin Liu 1 , Ling Fang 1 , Jian-Quan Lv 1 , Kangle Lv 2
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.scitotenv.2020.136897 Bing Li 1 , Jian-Zhong Guo 1 , Jia-Lin Liu 1 , Ling Fang 1 , Jian-Quan Lv 1 , Kangle Lv 2
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Hydrochar produced from agricultural and forestry wastes and its application into the environment are very attractive. Herein, a high-efficiency dithiocarbamate-modified hydrochar (DTHC) was prepared successfully and then applied to eliminate Pb(II) from aqueous solutions. DTHC was characterized by various techniques. It was found that dithiocarbamate and amine groups were successfully grafted onto the surface of hydrochar. The surface area of DTHC was 7.94 m2·g-1, which was four folds less than pristine hydrochar (31.60 m2·g-1), but its adsorption capacity obviously increased. Adsorption experiments showed that the Pb(II) adsorption process onto DTHC well accorded with pseudo-2nd-order kinetics and Langmuir isotherms. The highest Pb(II) uptake by DTHC at 293 K determined from the Langmuir model was 151.51 mg·g-1. Fourier transform infrared spectra and X-ray photoelectron spectroscopy verified that dithiocarbamate, carboxylate, amine and sulfonate groups all facilitated the Pb(II) adsorption. The adsorption mechanism was ascribed to the inner-sphere surface complexation of Pb(II) by these groups and to the ion exchange between Pb(II) and Na(I). Thus, DTHC is an effective adsorbent for Pb(II) removal from water.
中文翻译：
通过二硫代氨基甲酸酯改性的水碳去除水相铅离子。
从农业和林业废物中产生的碳氢化合物及其在环境中的应用非常有吸引力。本文成功地制备了高效的二硫代氨基甲酸酯改性烃（DTHC），然后用于从水溶液中去除Pb（II）。DTHC通过各种技术进行表征。发现二硫代氨基甲酸酯和胺基被成功接枝到烃的表面上。DTHC的表面积为7.94 m2·g-1，比原始水焦炭（31.60 m2·g-1）少四倍，但其吸附能力明显提高。吸附实验表明，Pb（II）在DTHC上的吸附过程符合拟二级动力学和Langmuir等温线。由Langmuir模型确定，在293 K下DTHC吸收的最高Pb（II）为151.51 mg·g-1。傅里叶变换红外光谱和X射线光电子能谱证实，二硫代氨基甲酸酯，羧酸根，胺基和磺酸根均促进了Pb（II）的吸附。这些基团的吸附机理归因于Pb（II）的内球表面络合以及Pb（II）和Na（I）之间的离子交换。因此，DTHC是从水中去除Pb（II）的有效吸附剂。
更新日期：2020-01-23
中文翻译：
通过二硫代氨基甲酸酯改性的水碳去除水相铅离子。
从农业和林业废物中产生的碳氢化合物及其在环境中的应用非常有吸引力。本文成功地制备了高效的二硫代氨基甲酸酯改性烃（DTHC），然后用于从水溶液中去除Pb（II）。DTHC通过各种技术进行表征。发现二硫代氨基甲酸酯和胺基被成功接枝到烃的表面上。DTHC的表面积为7.94 m2·g-1，比原始水焦炭（31.60 m2·g-1）少四倍，但其吸附能力明显提高。吸附实验表明，Pb（II）在DTHC上的吸附过程符合拟二级动力学和Langmuir等温线。由Langmuir模型确定，在293 K下DTHC吸收的最高Pb（II）为151.51 mg·g-1。傅里叶变换红外光谱和X射线光电子能谱证实，二硫代氨基甲酸酯，羧酸根，胺基和磺酸根均促进了Pb（II）的吸附。这些基团的吸附机理归因于Pb（II）的内球表面络合以及Pb（II）和Na（I）之间的离子交换。因此，DTHC是从水中去除Pb（II）的有效吸附剂。
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