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Selective adsorption of organic pigments on inorganically modified mesoporous biochar and its mechanism based on molecular structure.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.jcis.2020.03.112 Ruya Lin 1 , Zhijie Liang 2 , Chun Yang 2 , Zhiwei Zhao 2 , Fuyi Cui 2
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.jcis.2020.03.112 Ruya Lin 1 , Zhijie Liang 2 , Chun Yang 2 , Zhiwei Zhao 2 , Fuyi Cui 2
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The treatment of organic pigments has gained significant attention worldwide owing to the large amounts of pollutants emitted during the process. The main purpose of this study is to prepare an environmentally friendly, low-cost adsorbent with high efficiency with selective adsorption for water purification. An inorganically modified mesoporous biochar derived from sorghum straw was synthesized in one step, and three typical organic pigments including methyl blue (MB), acid orange 7 (AO7), and alizarin red (AR) were selected as cationic, azo, and anionic pigments, respectively. The characterization results demonstrated that Fe3O4 particles successfully attached to the surface of biochar after modification. Although the enhanced adsorption behaviors of the three pigments on the modified biochar were described effectively by the Langmuir isotherm, the as-prepared materials showed a better selective adsorption effect on the cationic pigments. Moreover, the adsorption processes of all targeted pigments were endothermic and governed by entropy. Smaller molecular dimensions, lighter molecular weight, and the low molecular electrostatic potential of MB are responsible for its selective adsorption; however, the enhanced adsorption affinity is attributed to the hydrogen bond and n-π interaction with the benzene ring of the pigment molecules.
中文翻译：
有机颜料在无机改性介孔生物炭上的选择性吸附及其基于分子结构的机理。
由于有机颜料的处理过程中释放出大量污染物，因此有机颜料的处理已引起全世界的广泛关注。这项研究的主要目的是制备一种对环境友好的低成本吸附剂，该吸附剂具有高效的选择性吸附，用于水净化。一步合成了一种高粱秸秆的无机改性介孔生物炭，并选择了三种典型的有机颜料，包括甲基蓝（MB），酸性橙7（AO7）和茜素红（AR）作为阳离子，偶氮和阴离子颜料。 ， 分别。表征结果表明，改性后Fe3O4颗粒成功附着在生物炭表面。尽管Langmuir等温线有效地描述了三种颜料在改性生物炭上的增强吸附行为，所制备的材料对阳离子颜料表现出较好的选择性吸附作用。而且，所有目标颜料的吸附过程都是吸热的，并且受熵控制。MB的分子尺寸较小，分子量较轻以及分子静电势低是其选择性吸附的原因。然而，提高的吸附亲和力归因于氢键以及与颜料分子苯环的n-π相互作用。
更新日期：2020-04-01
中文翻译：
有机颜料在无机改性介孔生物炭上的选择性吸附及其基于分子结构的机理。
由于有机颜料的处理过程中释放出大量污染物，因此有机颜料的处理已引起全世界的广泛关注。这项研究的主要目的是制备一种对环境友好的低成本吸附剂，该吸附剂具有高效的选择性吸附，用于水净化。一步合成了一种高粱秸秆的无机改性介孔生物炭，并选择了三种典型的有机颜料，包括甲基蓝（MB），酸性橙7（AO7）和茜素红（AR）作为阳离子，偶氮和阴离子颜料。 ， 分别。表征结果表明，改性后Fe3O4颗粒成功附着在生物炭表面。尽管Langmuir等温线有效地描述了三种颜料在改性生物炭上的增强吸附行为，所制备的材料对阳离子颜料表现出较好的选择性吸附作用。而且，所有目标颜料的吸附过程都是吸热的，并且受熵控制。MB的分子尺寸较小，分子量较轻以及分子静电势低是其选择性吸附的原因。然而，提高的吸附亲和力归因于氢键以及与颜料分子苯环的n-π相互作用。
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