设计并表征生物质模板/SnO 纳米复合材料以增强对 2,4-二氯苯酚的吸附。
Design and characterization of a biomass template/SnO nanocomposite for enhanced adsorption of 2,4-dichlorophenol.
机构信息
MOE Key Laboratory of Materials Physics and Chemistry in Extraordinary Conditions, Shaanxi Key Laboratory of Macromolecular Science and Technology School of Natural & Applied Sciences, Northwestern Polytechnical University, Xi'an, 710072, PR China.
Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, School of Chemistry and Chemical Engineering, Yulin University, Yulin, 719000, PR China; School of Materials Science and Engineering, Xi'an Jiaotong University-Yulin University Institute for Industrial Innovation of New Materials, Xi'an, 710049, PR China.
出版信息
Environ Res. 2020 Feb;181:108955. doi: 10.1016/j.envres.2019.108955. Epub 2019 Nov 23.
2,4-Dichlorophenol (2,4-DCP) is a hazardous chlorinated organic chemical derived from phenol that exerts serious effects on living organisms. In the present study, SnO templated with grapefruit peel carbon as a nanocomposite (SnO@GPC) was designed via ball-milling, and its mechanism of 2,4-DCP adsorption in aqueous solution was determined. Batch adsorption experiments revealed that the maximum adsorption efficiency of SnO@GPC occurred at 6.0 pH, 3 mg L initial adsorbate concentration, 2 h contact time, and 293 K temperature. The SnO@GPC nanocomposite and its non-tin-bearing counterpart, grapefruit derived char (@GPC), showed maximum adsorption capacities (Q) of 45.95 and 22.09 mg g and partition coefficients of 41.77 and 10.83 mg g μM, respectively. The adsorption of 2,4-DCP was best described by the Redlich-Peterson model followed by the Langmuir model with high correlation coefficients (R ≥ 0.96), and the adsorption kinetic data best fitted the pseudo-second-order model (R ≥ 0.98). The thermodynamic parameters indicated that the reaction was spontaneous, exothermic, and involved high affinity between SnO@GPC and 2,4-DCP. The high desorption efficiency obtained (>80%) demonstrated the recyclability of the adsorbent. The enhanced Q of SnO@GPC was due to the effective combination of GPC and SnO. A thin porous layer of GPC on SnO nanoparticles provided effective channels, a large surface area, and an abundance of active sites for 2,4-DCP adsorption. Thus, the SnO@GPC nanocomposite could potentially be used as a low-cost adsorbent to remove 2,4-DCP from water.
2,4-二氯苯酚（2,4-DCP）是一种源自苯酚的危险氯代有机化学品，对生物体有严重影响。在本研究中，通过球磨设计了以柚子皮碳为模板的SnO 纳米复合材料（SnO@GPC），并确定了其在水溶液中吸附 2,4-DCP 的机制。批量吸附实验表明，SnO@GPC 的最大吸附效率出现在 6.0 pH、2 h 接触时间、3 mg L 初始吸附质浓度和 293 K 温度下。SnO@GPC 纳米复合材料及其不含锡的对应物，柚子衍生炭（@GPC），分别显示出 45.95 和 22.09 mg g 的最大吸附容量（Q）和 41.77 和 10.83 mg g μM 的分配系数。2,4-DCP 的吸附最符合 Redlich-Peterson 模型，其次是 Langmuir 模型，相关系数（R≥0.96）较高，吸附动力学数据最符合准二级模型（R≥0.98）。热力学参数表明，反应是自发的、放热的，SnO@GPC 和 2,4-DCP 之间存在高亲和力。获得的高解吸效率（>80%）表明了吸附剂的可回收性。SnO@GPC 高 Q 的原因是 GPC 和 SnO 的有效结合。GPC 在 SnO 纳米颗粒上形成的薄多孔层提供了有效的通道、大的表面积和大量的活性位点，有利于 2,4-DCP 的吸附。因此，SnO@GPC 纳米复合材料可能被用作从水中去除 2,4-DCP 的低成本吸附剂。
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