黄河兰州段悬浮颗粒对硝基苯污染物的吸附行为研究
Adsorption Behavior of Nitrobenzene Contaminants on Suspended Particles in Lanzhou Section of the Yellow River
摘要: 为全面了解悬浮颗粒对硝基苯类污染物的吸附影响，研究了黄河兰州段悬浮颗粒对硝基苯的吸附行为及影响因素。研究发现，水体中悬浮颗粒对硝基苯类污染物的吸附能力存在很大的影响。因此，本文选取黄河兰州段悬浮颗粒作为研究对象，采用批量实验法探索硝基苯类污染物在悬浮颗粒中的迁移规律和吸附特征。结果表明：硝基苯类污染物在黄河兰州段悬浮颗粒上的吸附分为三个阶段，即快速、慢速和平衡吸附期，吸附平衡时间为18 h。黄河兰州段悬浮颗粒对硝基苯类污染物的动力学吸附过程较好地符合准二级吸附动力学模型；热力学吸附较好地符合Freundlich等温吸附模型；在吸附过程中，硝基苯的吸附自由能变ΔGθ < 0，焓变ΔHθ及熵变ΔSθ均>0，表明黄河兰州段悬浮颗粒对硝基苯类污染物的吸附是一个自发吸热且吸附体系的混乱度增大的反应过程。硝基苯类污染物的初始浓度、溶液pH和悬浮颗粒粒径均对吸附有较大影响，具体表现为：吸附容量与硝基苯类污染物初始浓度呈正比，与悬浮颗粒粒径呈反比，pH在3~5和8~10范围内时，吸附容量与pH值呈正比，pH在5~8范围内时，吸附容量基本保持不变。总体来看，水体中的悬浮颗粒对硝基苯的吸附是受硝基苯初始浓度、溶液pH和悬浮颗粒粒径影响的自发吸热过程。
Abstract: In order to fully understand the adsorption effect of nitrobenzene pollutants on suspended particles, the adsorption behavior and influencing factors of nitrobenzene on suspended particles in the Lanzhou section of the Yellow River were studied. The study found that suspended particles in water have a great influence on the adsorption capacity of nitrobenzene pollutants. Therefore, this paper selects the suspended particles from the Lanzhou section of the Yellow River as the research object, and uses the batch experiment method to explore the migration and adsorption character-istics of nitrobenzene pollutants in suspended particles. The results show that the adsorption of nitrobenzene pollutants on suspended particles in the Lanzhou section of the Yellow River is di-vided into three stages, namely, fast, slow and equilibrium adsorption periods, and the adsorption equilibrium time is 18 h. The kinetic adsorption process of suspended particulates to nitrobenzene pollutants in the Lanzhou section of the Yellow River is in good agreement with the quasi-secondary adsorption kinetics model; the thermodynamic adsorption is in good agreement with the Freundlich isotherm adsorption model; during the adsorption process, the free energy change of the adsorption of nitrobenzene ΔGθ < 0, the enthalpy change ΔHθ and the entropy change ΔSθ are all >0, which indicates that the adsorption of nitrobenzene pollutants by the suspended particles in the Lanzhou section of the Yellow River is a spontaneous endothermic process and the chaotic degree of the adsorption system increases. The initial concentration of nitrobenzene pollutants, the pH of the solution and the particle size of the suspended particles have a great influence on the adsorption. The specific performance is as follows: the adsorption capacity is proportional to the initial concentration of nitrobenzene pollutants, and inversely proportional to the particle size of suspended particles. When the pH is in the range of 3~5 and 8~10, the adsorption capacity is pro-portional to the pH value. When the pH is in the range of 5~8, the adsorption capacity remains ba-sically unchanged. Generally speaking, the adsorption of nitrobenzene by suspended particles in water is a spontaneous endothermic process affected by initial concentration of nitrobenzene, so-lution pH and particle size of suspended particles.
文章引用：蒋煜峰, AlounpadethPhouangphet, 温红, 张前, 刘兰兰, 原陇苗, 白继辉. 黄河兰州段悬浮颗粒对硝基苯污染物的吸附行为研究[J]. 环境保护前沿, 2018, 8(6): 570-578. https://doi.org/10.12677/AEP.2018.86070

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