本文選題：非均相 + 過硫酸鹽　； 參考：《大連工業(yè)大學》2016年碩士論文

【摘要】：本實驗選取羅丹明B為目標污染物,選擇羅丹明B(Rh B)染料廢水作為目標污染物是由于據(jù)資料顯示,在全國工業(yè)廢水排放中,紡織廢水年排放量可達23億噸,其占總廢水排放量的10.6%,排位第三。而在龐大的紡織廢水中,染料廢水占其總排放量的80%,所以對染料廢水相關(guān)處理方式的研究十分有意義。高級氧化技術(shù)大體可分為兩大類:均相反應和非均相反應。本實驗采取非均相反應,在催化劑的制備中以活性炭作為載體,為了將過渡金屬鐵負載在活性炭上,采用了老化-煅燒的方法制備催化劑(Fe/AC),并通過XRD對制備的催化劑進行表征,結(jié)果顯示鐵以氧化物的方式負載在活性炭上。本研究采用Fe/AC催化過硫酸鹽(K2S2O8)產(chǎn)生氧化能力較強的硫酸根自由基(·SO4-)對羅丹明B溶液進行處理。首先確定出制備催化劑的最佳條件,然后,改變催化劑投加量、氧化劑投加量、反應溶液初始濃度、反應溶液初始p H和溫度等變量,得出脫色羅丹明B的最佳實驗條件。由于微波、超聲、紫外光照可以協(xié)同促進·SO4-的產(chǎn)生,所以考察了在微波體系中、超聲體系中以及紫外光照體系中,不同變量對實驗的影響,并得出脫色羅丹明B最佳反應條件。在以上四大反應體系中,分別對反應過程中產(chǎn)生的自由基加以驗證,并對其紫外-可見吸收譜圖進行分析。所得到的實驗結(jié)論如下:(1)在室溫時,Fe/AC的投加量為1.5g/L,K2S2O8投加量為0.6g/L,在溶液初始p H的條件下,對100mg/L的Rh B溶液進行脫色,2.5h后其脫色率可達80%以上;升高溫度有利于羅丹明B的脫色,65℃時羅丹明B的脫色率達99%。(2)在微波輔助條件下,Fe/AC的投加量為0.8g/L,K2S2O8投加量為0.4g/L,在溶液初始p H的條件下,對100mg/L的Rh B溶液進行脫色,40s后其脫色率可達76%。與室溫條件相比,微波輔助大大縮短了羅丹明B脫色所需的時間。(3)在超聲輔助條件下,Fe/AC的投加量為1.2g/L,K2S2O8投加量為0.8g/L,在溶液初始p H的條件下,對100mg/L的Rh B溶液進行脫色,40min后其脫色率可達70%。與不加超聲相比,羅丹明B脫色率增加27%。(4)在紫外光照輔助條件下,Fe/AC的投加量為1.5g/L,K2S2O8投加量為0.4g/L,在溶液初始p H的條件下,對100mg/L的Rh B溶液進行脫色,50min后其脫色率可達73%。與Fe/AC-K2S2O8相比,羅丹明B脫色率增加15%。上述四種體系中,通過自由基的驗證實驗可知,存在·SO4-和·OH共同作用脫色Rh B溶液。
[Abstract]:In this experiment, Rhodamine B was chosen as the target pollutant and Rhodamine B(Rh B) dye wastewater as the target pollutant because according to the data, the annual discharge of textile wastewater could reach 2.3 billion tons in the national industrial wastewater discharge. It accounts for 10.6% of the total waste water discharge, ranked third. Among the huge textile wastewater, the dye wastewater accounts for 80% of the total discharge, so it is very meaningful to study the treatment methods of dye wastewater. Advanced oxidation technology can be divided into two broad categories: homogeneous reaction and heterogeneous reaction. In this experiment, the catalyst was prepared by heterogeneous reaction, the active carbon was used as the carrier in the preparation of the catalyst, in order to support the transition metal iron on the activated carbon, the catalyst was prepared by the method of aging and calcination, and the catalyst was characterized by XRD. The results show that iron is loaded on the activated carbon in the form of oxides. In this study, Rhodamine B solution was treated by Fe/AC catalyzed persulfate K2S2O8) to produce sulfate radical (SO4) with strong oxidation ability. The optimum conditions for the preparation of the catalyst were determined, and the optimal conditions for decolorizing Rhodamine B were obtained by changing the amount of catalyst, the amount of oxidant, the initial concentration of the reaction solution, the initial pH of the reaction solution and the temperature. Since microwave, ultrasonic and ultraviolet irradiation can promote the production of so _ 4-, the effects of different variables on the experiment in microwave system, ultrasonic system and ultraviolet radiation system are investigated, and the optimum reaction conditions for decolorization of rhodamine B are obtained. In the above four reaction systems, the free radicals produced during the reaction were verified, and the UV-Vis absorption spectra were analyzed. The experimental results are as follows: (1) at room temperature, the dosage of Fe / AC is 1.5g / L K2S2O8 = 0.6g / L, and the decolorization rate of 100mg/L RhB solution can reach more than 80% after 2.5 h decolorization at initial pH; The decolorization rate of Rhodamine B reaches 99g / L at 65 鈩，

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