改性松针吸附云除水溶液中磷的实验研究

发布时间：2018-03-15 11:42

本文选题：松针　切入点：磷去除　出处：《东北师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：松针是一种可再生资源,在落叶林区有着可观的积累量,具有快速增殖的能力,并且一年四季可以采收。本实验拟对松针进行除磷研究,经过氢氧化钠-异丙醇处理的松针几乎不能实现对模拟溶液中的磷酸盐的去除。因此,实验中对经过碱-醇处理的松针进行表面改性,发现经过镧氢氧化物改性后能够明显提升松针的磷酸盐去除能力。在25℃时,发现被粉碎的松针(pine needle,PN)几乎不能有效去除磷酸盐,镧氢氧化物处理松针(LPN)的最大吸附量为4.80 mg P/g,而APN的最大吸附量为0.98 mg P/g,探究了溶液pH、温度、共存阴离子对磷去除效率的影响以及实验过程的TOC值,分析了改性松针吸附去除磷的热力学和动力学参数。实验中发现pH值对磷的去除效率表现为低pH值(3)明显促进吸附,pH值处于3-9.5之间对磷吸附去除效率影响不大,环境温度的升高,LPN的磷酸盐吸附容量增高,磷酸盐去除效率升高。ΔH°的值为25.30 KJ/mol,说明LPN吸附去除磷酸盐的反应是吸热反应,同时,ΔG°的值随着环境温度的升高而降低;准一、二级动力学和颗粒内扩撒方程,Langmuir和Freundlich等温方程能够很好的拟合数据。颗粒内扩散作用为主要控制步骤的单分子层吸附为主要吸附模式;共存离子实验表明低浓度的干扰离子对磷酸盐的吸附效果影响很小,实验中仅仅只有碳酸根离子浓度50 mg/L,表现出了一定的抑制吸附作用;总有机碳(TOC)值表明碱醇处理和表面改性能够明显降低松针的有机物溶出,而且SEM分析表明碱醇处理使得松针结构疏松多孔,能够明显增加松针的比表面积,使得更多镧氢氧化物易于附着。本文简要的说明了鸟粪石磷回收技术、电解法、结晶法、吸附/解吸法、生物炭回收、土壤系统回收技术等技术,分析了生物质材料改性和回用的可行性,阐述了磷回收的前景。
[Abstract]:Pine is a renewable resource, there is considerable accumulation in deciduous forest, has the capability of rapid proliferation, and can be harvested throughout the year. This paper studies on phosphorus removal needles by sodium hydroxide - isopropanol treatment of pine needles can hardly achieve removal of simulated solution of phosphate. Therefore, surface modification for after alkali ethanol treatment of pine needles in the experiment, found that after the modified lanthanum hydroxide can significantly enhance the phosphate removal ability. Pine needles at 25 DEG C, found crushed pine (pine needle PN) can hardly have effect on phosphate removal, lanthanum hydroxide treatment of pine needle (LPN) the maximum adsorption capacity of 4.80 mg P/g, and the maximum adsorption capacity of 0.98 APN mg P/g, explores the solution pH, temperature, influence of coexisting anions on the removal efficiency of phosphorus and the experimental value of TOC, analysis of the modified adsorbent to remove phosphorus hot needles The mechanical and dynamic parameters. It was found that the pH removal efficiency of phosphorus showed low pH value in the experiment (3) could promote the adsorption, pH value is between 3-9.5 the adsorption of phosphorus removal efficiency is not affected, the increase of environmental temperature, phosphate adsorption capacity of LPN increased, the phosphate removal efficiency increased. A H value of 25.30 degrees KJ/mol shows that phosphate removal LPN adsorption reaction is an endothermic reaction, at the same time, a G degree decreases with the increase of environmental temperature; quasi, two order kinetics and intra particle diffusion equation can fit the data well Langmuir and Freundlich isotherm. The intraparticle diffusion effect of single molecular layer as the main control the steps of adsorption was the main adsorption model; experiments show that the adsorption effect of coexisting ions effects of interfering ions in low concentration of phosphate is very small, the only carbonate ion concentration of 50 mg/L, showed a certain inhibition of adsorption Effect; total organic carbon (TOC) values indicate that the alkali alcohol treatment and surface modification can significantly reduce the organic pine dissolution, and SEM analysis showed that the alkali alcohol treatment makes the porous pine, pine needles can significantly increase the surface area, the more easily attached. Lanthanum hydroxide this paper briefly explains the struvite phosphorus recovery technology, electrolysis, crystallization, adsorption / desorption method, biological carbon recycling, recycling technology of soil system, analyzes the feasibility of reuse and modification of biomass materials, expounds the phosphorus recovery prospects.

【学位授予单位】：东北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X52

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