硅基介孔材料处理废水的研究

发布时间：2017-12-31 21:23

本文关键词：硅基介孔材料处理废水的研究　出处：《重庆大学》2016年硕士论文　论文类型：学位论文

【摘要】：含铬废水、磷化废水以及染料废水不仅污染水体、损害生物多样性,而且严重威胁着人类健康,在水资源十分短缺的今天,保护水体安全、防止水质污染、及时有效处理含铬废水、磷化废水以及染料废水已变得越来越重要。目前,吸附法是处理含铬废水、磷化废水以及染料废水的常规手段,其关键是选择出一种高效价廉的吸附材料,硅在自然界中含量丰富,原料易得,其中介孔二氧化硅具有大的比表面积、规则的孔道、大量的硅羟基,是良好的吸附材料,特别是功能化的介孔二氧化硅,可以表现出纯硅所没有的功能,提高吸附的选择性。论文共分为五个部分:第一部分合成了介孔二氧化硅HMS,并将铁负载于HMS之上,制备出铁改性的Fe/HMS,经过XRD表征显示,样品均只在小角度2θ=2o左右出现一个特征峰,说明已经成功合成出短程无序长程有序的六方介孔二氧化硅HMS和Fe/HMS两种材料;经过N2吸附-脱附表征显示,样品的吸附-脱附等温线属于Langmuir IV类型曲线,是典型的介孔吸附特征曲线,HMS的孔径分布集中在3.05nm,比表面积为945.387 m2/g;Fe/HMS的孔径分布集中在2.72nm,比表面积为858.136 m2/g。论文第二部分进行了HMS和Fe/HMS吸附罗丹明B的研究。对吸附结果进行了热力学分析和动力学分析,表明HMS和Fe/HMS吸附罗丹明B的过程均适用于Langmuir吸附等温模型和假二级动力学方程,属于单分子层吸附,吸附速率由表面吸附过程控制,并得出理论饱和吸附量分别为137.3 mg/g和84.03 mg/g;研究了不同模拟废水的初始浓度、吸附剂用量、温度、pH、时间对吸附的影响,结果表明,在室温下,对于25ml的50mg/L模拟废水体系,最佳吸附条件为pH=5、HMS和Fe/HMS的用量分别为15mg和30mg,时间为60min,去除率分别为98.5%和98.9%。论文第三部分进行了HMS和Fe/HMS吸附亚甲基蓝的研究。对吸附结果进行了热力学分析和动力学分析,表明HMS和Fe/HMS吸附亚甲基蓝的过程均适用于Langmuir吸附等温模型和假二级动力学方程,属于单分子层吸附,吸附速率由表面吸附过程控制,并得出理论饱和吸附量分别为150.3 mg/g和106.3 mg/g;研究了不同模拟废水的初始浓度、吸附剂用量、温度、pH和时间对吸附的影响,结果表明,在室温下,对于p H=6.5、25mL的50mg/L模拟废水体系,最佳吸附条件为、HMS和Fe/HMS的用量为8mg和15mg、时间为60min,去除率分别为91.07%和97.7%。论文第四部分进行了HMS和Fe/HMS吸附六价铬的研究。对吸附结果进行了热力学分析和动力学分析,表明HMS和Fe/HMS吸附六价铬的过程均适用于Langmuir吸附等温模型和假二级动力学方程,属于单分子层吸附,吸附速率由表面吸附过程控制,并得出理论饱和吸附量分别为3.305mg/g和9.37mg/g;研究了不同模拟废水的初始浓度、温度、pH和时间对吸附的影响,结果表明,在室温下,对于25ml的15mg/L模拟废水体系,当HMS和Fe/HMS的用量为16mg时,最佳吸附工艺条件为pH为2、时间为15min去除率为30.1%和73.6%。论文第五部分进行了HMS和Fe/HMS吸附磷酸根的研究。对吸附结果进行了热力学分析和动力学分析,表明HMS和Fe/HMS吸附磷酸根的过程均适用于Langmuir吸附等温模型和假二级动力学方程,属于单分子层吸附,吸附速率由表面吸附过程控制,并得出理论饱和吸附量分别为2.158mg/g和8.53mg/g;研究了不同模拟废水的初始浓度、温度、pH和时间下的吸附规律,结果表明对于室温下,,对于25ml的15mg/L模拟废水体系,当HMS和Fe/HMS的用量为16mg时,最佳吸附工艺条件:pH=2、吸附剂用量为16mg、时间为15min,去除率为16.6%和44.29%。
[Abstract]:Wastewater containing chromium phosphating wastewater and dye wastewater, not only pollute the water, damage to biodiversity, but also a serious threat to human health, in the shortage of water resources today, the protection of water safety, prevent water pollution, timely and effective treatment of wastewater containing chromium phosphating wastewater, and dye wastewater has become more and more important. At present, the adsorption method is the treatment of chromium the conventional means of Phosphating Wastewater and wastewater, dye wastewater, the key is to select a cheap efficient adsorption material, silicon rich content in nature, easily available raw materials, including two mesoporous silicon oxide with large specific surface area, regular pore, a silicon hydroxyl, is a good absorbent material, in particular mesoporous silica is functionalized, pure silicon can exhibit no function, improve the adsorption selectivity. The thesis is divided into five parts: the first part is the synthesis of mesoporous silica and HMS. The iron load on HMS, the preparation of iron modified Fe/HMS, after XRD analysis shows that the samples are only in the small angle 2 theta =2o about the emergence of a characteristic peak, that have been successfully synthesized six short-range disorder long-range ordered mesoporous silica HMS and Fe/HMS two kinds of materials; after N2 adsorption desorption a sample analysis shows that the adsorption desorption isotherms belong to Langmuir type IV curve is characteristic of mesoporous adsorption curve, the pore size distribution of HMS concentration in 3.05nm, the specific surface area was 945.387 m2/g; the pore size distribution of Fe/HMS concentration in 2.72nm, HMS and Fe/HMS on the adsorption of rhodamine B and the specific surface area of 858.136 the second part of the paper. M2/g. results were analyzed on the adsorption thermodynamics analysis and kinetics, HMS and Fe/HMS showed that the adsorption of rhodamine B were applied to the Langmuir isotherm model and the pseudo two order kinetics equation, which belongs to the single molecule layer absorption Attached, the adsorption rate by surface adsorption process control, and the theory of saturated adsorption capacity was 137.3 mg/g and 84.03 mg/g respectively; the initial concentration of wastewater, adsorbent dosage, temperature, pH, time on the adsorption effect, results show that at room temperature for 25ml 50mg/L simulated wastewater system, optimal adsorption the condition is pH=5, HMS and Fe/HMS were 15mg and 30mg, time is 60min, the removal rate was 98.5% and 98.9%. respectively. The third part studies of methylene blue HMS and Fe/HMS adsorption. The adsorption results were analyzed and the thermodynamic analysis showed that HMS and Fe/HMS kinetics, the adsorption of methylene blue were suitable for Langmuir the adsorption isotherm model and pseudo two order kinetics equation is monolayer adsorption, the adsorption rate by surface adsorption process control, and the theory of saturated adsorption capacity was 150.3 mg/g and 106.3 mg/g respectively; research The different initial concentration of simulated wastewater, adsorbent dosage, temperature, pH and time on the adsorption effects, the results show that at room temperature, the P H=6.5,25mL 50mg/L wastewater system, optimum conditions for adsorption, HMS and Fe/HMS were 8mg and 15mg, time is 60min, the removal rates were 91.07% and 97.7%. the fourth part of the thesis studied HMS and Fe/HMS adsorption of chromium six. The adsorption results were analyzed and the thermodynamic analysis shows that the process dynamics, HMS and Fe/HMS adsorption of chromium six are applicable to the Langmuir adsorption isotherm model and pseudo two level dynamic equation, is monolayer adsorption, the adsorption rate by adsorption process control, and that the saturated adsorption capacity is 3.305mg/g and 9.37mg/g respectively; the initial concentration of the wastewater, simulation of different temperature, pH and time on the adsorption effect, the results show that at the room temperature for 25ml 15mg/ L wastewater system, when HMS and Fe/HMS dosage was 16mg, the optimum adsorption conditions were pH for the 2 time, the removal rate of 15min was 30.1% 73.6%. and the fifth part of the thesis is studied by HMS and Fe/HMS. The adsorption of phosphate on the adsorption results of thermodynamic analysis and dynamic analysis, show that the process of HMS and Fe/HMS the adsorption of phosphate can be applied to the Langmuir adsorption isotherm model and pseudo two order kinetics equation is monolayer adsorption, the adsorption rate by surface adsorption process control, and that the saturated adsorption capacity is 2.158mg/g and 8.53mg/g respectively; initial concentration of different wastewater temperature, adsorption of pH and the time of the results for that, at room temperature for 25ml 15mg/L simulated wastewater system, when HMS and Fe/HMS dosage was 16mg, the optimum adsorption conditions: pH=2, adsorbent dosage is 16mg, time is 15min, the removal rate was 16. 6% and 44.29%.

【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X703

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