原位碳热还原处理对洗涤条件下介孔硅碳复合材料吸附性能的影响。
Effect of washing conditions on adsorptive properties of mesoporous silica carbon composites by in-situ carbothermal treatment.
机构信息
Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China.
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
出版信息
Sci Total Environ. 2020 May 10;716:136770. doi: 10.1016/j.scitotenv.2020.136770. Epub 2020 Jan 21.
Mesoporous silicon carbon (MSC) composites were prepared by in-situ carbothermal treatment of cetyl trimethyl ammonium bromide derived from mesoporous silica. MSC composites were used as adsorbent for methylene blue (MB) removal. Research was focused on investigating effect of washing conditions (deionized water or alkali) on surface properties and adsorption capacity of MSC composites. Results showed that best adsorption performance was given by the MSC composite washed by alkali at optimum pH 13.0. Adsorption mechanism for MB removal was systematically investigated by X-ray photoelectron spectrometer analysis, adsorption isotherms, adsorption kinetics and adsorption thermodynamics. MB adsorption by the MSC composites was found to be driven by three possible schemes: physical exothermic reaction, hydrogen bonds and π-interaction. The maximum adsorption capacity was 156.56 mg/g for MSC. The negative values of ΔG, ΔH and ΔS indicated that the adsorption process was a spontaneous exothermic reaction. The adsorbent can be regenerated for reuse.
介孔硅碳 (MSC) 复合材料是通过原位碳热处理由介孔硅衍生的十六烷基三甲基溴化铵制备的。MSC 复合材料用作去除亚甲基蓝 (MB) 的吸附剂。研究集中在研究洗涤条件（去离子水或碱）对 MSC 复合材料表面性质和吸附能力的影响。结果表明，在最佳 pH 值 13.0 下用碱洗涤的 MSC 复合材料具有最佳的吸附性能。通过 X 射线光电子能谱分析、吸附等温线、吸附动力学和吸附热力学系统地研究了 MB 去除的吸附机理。发现 MSC 复合材料对 MB 的吸附是由三种可能的方案驱动的：物理放热反应、氢键和π-相互作用。MSC 的最大吸附容量为 156.56 mg/g。ΔG、ΔH 和 ΔS 的负值表明吸附过程是自发的放热反应。该吸附剂可回收再利用。
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