本文關(guān)鍵詞：硅基介孔材料處理廢水的研究　出處：《重慶大學》2016年碩士論文　論文類型：學位論文

  更多相關(guān)文章： HMS Fe/HMS 六價鉻 磷酸根 亞甲基藍 羅丹明B

【摘要】：含鉻廢水、磷化廢水以及染料廢水不僅污染水體、損害生物多樣性,而且嚴重威脅著人類健康,在水資源十分短缺的今天,保護水體安全、防止水質(zhì)污染、及時有效處理含鉻廢水、磷化廢水以及染料廢水已變得越來越重要。目前,吸附法是處理含鉻廢水、磷化廢水以及染料廢水的常規(guī)手段,其關(guān)鍵是選擇出一種高效價廉的吸附材料,硅在自然界中含量豐富,原料易得,其中介孔二氧化硅具有大的比表面積、規(guī)則的孔道、大量的硅羥基,是良好的吸附材料,特別是功能化的介孔二氧化硅,可以表現(xiàn)出純硅所沒有的功能,提高吸附的選擇性。論文共分為五個部分:第一部分合成了介孔二氧化硅HMS,并將鐵負載于HMS之上,制備出鐵改性的Fe/HMS,經(jīng)過XRD表征顯示,樣品均只在小角度2θ=2o左右出現(xiàn)一個特征峰,說明已經(jīng)成功合成出短程無序長程有序的六方介孔二氧化硅HMS和Fe/HMS兩種材料;經(jīng)過N2吸附-脫附表征顯示,樣品的吸附-脫附等溫線屬于Langmuir IV類型曲線,是典型的介孔吸附特征曲線,HMS的孔徑分布集中在3.05nm,比表面積為945.387 m2/g;Fe/HMS的孔徑分布集中在2.72nm,比表面積為858.136 m2/g。論文第二部分進行了HMS和Fe/HMS吸附羅丹明B的研究。對吸附結(jié)果進行了熱力學分析和動力學分析,表明HMS和Fe/HMS吸附羅丹明B的過程均適用于Langmuir吸附等溫模型和假二級動力學方程,屬于單分子層吸附,吸附速率由表面吸附過程控制,并得出理論飽和吸附量分別為137.3 mg/g和84.03 mg/g;研究了不同模擬廢水的初始濃度、吸附劑用量、溫度、pH、時間對吸附的影響,結(jié)果表明,在室溫下,對于25ml的50mg/L模擬廢水體系,最佳吸附條件為pH=5、HMS和Fe/HMS的用量分別為15mg和30mg,時間為60min,去除率分別為98.5%和98.9%。論文第三部分進行了HMS和Fe/HMS吸附亞甲基藍的研究。對吸附結(jié)果進行了熱力學分析和動力學分析,表明HMS和Fe/HMS吸附亞甲基藍的過程均適用于Langmuir吸附等溫模型和假二級動力學方程,屬于單分子層吸附,吸附速率由表面吸附過程控制,并得出理論飽和吸附量分別為150.3 mg/g和106.3 mg/g;研究了不同模擬廢水的初始濃度、吸附劑用量、溫度、pH和時間對吸附的影響,結(jié)果表明,在室溫下,對于p H=6.5、25mL的50mg/L模擬廢水體系,最佳吸附條件為、HMS和Fe/HMS的用量為8mg和15mg、時間為60min,去除率分別為91.07%和97.7%。論文第四部分進行了HMS和Fe/HMS吸附六價鉻的研究。對吸附結(jié)果進行了熱力學分析和動力學分析,表明HMS和Fe/HMS吸附六價鉻的過程均適用于Langmuir吸附等溫模型和假二級動力學方程,屬于單分子層吸附,吸附速率由表面吸附過程控制,并得出理論飽和吸附量分別為3.305mg/g和9.37mg/g;研究了不同模擬廢水的初始濃度、溫度、pH和時間對吸附的影響,結(jié)果表明,在室溫下,對于25ml的15mg/L模擬廢水體系,當HMS和Fe/HMS的用量為16mg時,最佳吸附工藝條件為pH為2、時間為15min去除率為30.1%和73.6%。論文第五部分進行了HMS和Fe/HMS吸附磷酸根的研究。對吸附結(jié)果進行了熱力學分析和動力學分析,表明HMS和Fe/HMS吸附磷酸根的過程均適用于Langmuir吸附等溫模型和假二級動力學方程,屬于單分子層吸附,吸附速率由表面吸附過程控制,并得出理論飽和吸附量分別為2.158mg/g和8.53mg/g;研究了不同模擬廢水的初始濃度、溫度、pH和時間下的吸附規(guī)律,結(jié)果表明對于室溫下,,對于25ml的15mg/L模擬廢水體系,當HMS和Fe/HMS的用量為16mg時,最佳吸附工藝條件:pH=2、吸附劑用量為16mg、時間為15min,去除率為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%.

【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：X703

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本文編號：1361542