本文關(guān)鍵詞：亞氧化鈦陰極用于微生物電解去除酸性紅B的效能研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 亞氧化鈦陰極 碳布陰極 微生物電解 酸性紅B

【摘要】：偶氮染料作為品種或數(shù)量上最大的一類合成染料,被廣泛應(yīng)用于紡織、印染、塑料、皮革和食品等行業(yè),但偶氮染料廢水色度大、COD高、毒性強(qiáng)、有機(jī)成分復(fù)雜,處理不當(dāng)會(huì)對(duì)公眾健康和自然水體環(huán)境帶來(lái)嚴(yán)重危害。目前針對(duì)偶氮染料廢水的傳統(tǒng)處理工藝基本分為物理法、化學(xué)法、生物法及多種工藝的耦合,但眾多的處理手段也有其固有的弊端,即高效率和低成本難以兼顧的問(wèn)題。本研究以典型的偶氮染料酸性紅B為目標(biāo)污染物,基于微生物電解的原理,采用雙室微生物電解反應(yīng)裝置(MEC),研究其陰極對(duì)于酸性紅B的還原去除效果,以實(shí)現(xiàn)經(jīng)濟(jì)、高效處理酸性紅B廢水的目的。在實(shí)驗(yàn)上設(shè)置了碳布、亞氧化鈦陰極MEC,研究不同陰極材料強(qiáng)化酸性紅B還原脫色的效果。實(shí)驗(yàn)完成了碳布、亞氧化鈦陰極MEC反應(yīng)器的啟動(dòng)及對(duì)酸性紅B的還原去除效能的對(duì)比分析。利用單室MFC成功馴化生物陽(yáng)極后將其轉(zhuǎn)移至MEC體系中,啟動(dòng)過(guò)程中陽(yáng)極微生物適應(yīng)狀況良好,陽(yáng)極電位基本穩(wěn)定于-450m V,陰極電位基本于-950m V。在對(duì)酸性紅B還原脫色的考察中,兩種陰極MEC體系均符合一級(jí)反應(yīng)動(dòng)力學(xué)特征,其中亞氧化鈦陰極的反應(yīng)速率常數(shù)為0.339h-1,碳布為0.179 h-1,亞氧化鈦陰極僅需7h就可以達(dá)到91.95%脫色率,而碳布陰極則需要至少12h才能達(dá)到類似的處理效果,說(shuō)明亞氧化鈦陰極能夠明顯加快反應(yīng)的動(dòng)力學(xué)過(guò)程。此外對(duì)亞氧化鈦陰極MEC還原酸性紅B的產(chǎn)物和降解路徑進(jìn)行了分析,結(jié)果證明酸性紅B分子中的偶氮鍵接受陰極的電子和質(zhì)子而發(fā)生斷裂,從而生成了產(chǎn)物1-萘胺-4-磺酸基和2-氨基-1-萘酚-4-磺酸基。實(shí)驗(yàn)對(duì)碳布、亞氧化鈦陰極MEC進(jìn)行了循環(huán)伏安和電化學(xué)交流阻抗測(cè)試,結(jié)果表明酸性紅B可以在碳布、亞氧化鈦陰極上發(fā)生還原反應(yīng),亞氧化鈦的電荷轉(zhuǎn)移內(nèi)阻和擴(kuò)散內(nèi)阻分別為10Ω、12Ω,遠(yuǎn)小于碳布的588Ω、3411Ω,說(shuō)明亞氧化鈦相較于碳布更有利于電子的轉(zhuǎn)移和物質(zhì)的擴(kuò)散,這歸功于以大孔和介孔分配為主的三維多孔結(jié)構(gòu),該結(jié)構(gòu)有利于物質(zhì)在其表面的傳輸遷移,并可為酸性紅B的還原提供較多的活性位點(diǎn),有利于實(shí)現(xiàn)反應(yīng)的快速進(jìn)行。課題還探究了亞氧化鈦陰極MEC關(guān)鍵運(yùn)行參數(shù)對(duì)酸性紅B還原及系統(tǒng)性能的影響。結(jié)果表明酸性紅B在外加電壓為0.5V、陰極p H為7.0,濃度在400mg/L以下時(shí),均能保證較短的處理時(shí)間、較高的庫(kù)倫效率和較低的反應(yīng)能耗,實(shí)現(xiàn)了經(jīng)濟(jì)、高效處理酸性紅B廢水的目的。最后對(duì)亞氧化鈦陰極的電化學(xué)穩(wěn)定性進(jìn)行了分析研究。結(jié)果表明在酸性或含有氯離子的腐蝕性溶液中,亞氧化鈦電極的腐蝕電流密度隨著電解液溶度的增大增加得極為緩慢,說(shuō)明了亞氧化鈦材料較強(qiáng)的抗腐蝕能力,適合于在電化學(xué)體系中的長(zhǎng)期運(yùn)行。
[Abstract]:Azo dyes are widely used in textile, printing, dyeing, plastics, leather and food industries as the largest synthetic dyes of variety or quantity. However, azo dye wastewater has high chromaticity and high toxicity. The organic composition is complex, the improper treatment will bring serious harm to the public health and the natural water body environment. At present, the traditional treatment process for azo dye wastewater is basically divided into physical method and chemical method. The coupling of biological process and various processes, but many treatment methods also have their inherent disadvantages, that is, high efficiency and low cost difficult to take into account. This study takes the typical azo dye acid red B as the target pollutant. Based on the principle of microbial electrolysis, the reduction and removal effect of the cathode for acid red B was studied by using a two-chamber microbial electrolysis reaction device, in order to realize economy. The purpose of high efficiency treatment of acid red B wastewater. Carbon cloth and titanium oxide cathode MECs were set up in the experiment to study the effect of different cathode materials to enhance the reduction and decolorization of acid red B. The start-up of the titanium oxide cathode MEC reactor and the comparative analysis of the reduction and removal efficiency of acid red B. the biological anode was successfully acclimated by single chamber MFC and transferred to the MEC system. The anodic potential was stable at -450 MV and the cathodic potential was about -950 MV during the start-up. In the investigation of acid red B reduction decolorization. The reaction rate constants of titanium oxide cathode and carbon cloth were 0.339h-1 and 0.179h-1, respectively. The decolorization rate of titanium oxide cathode can reach 91.95% in only 7 hours, while that of carbon cloth cathode is at least 12 hours. The kinetic process of the reaction was obviously accelerated by titanium oxide cathode, and the product and degradation path of acid red B reduction by MEC were analyzed. The results show that the azo bond in the acid red B molecule is broken by electrons and protons of the cathode. The products of 1-naphthylamine-4-sulfonic group and 2-amino-1-naphthol -4-sulfonic group were obtained. Cyclic voltammetry and electrochemical impedance measurements of carbon cloth and titanium oxide cathode MEC were carried out. The results show that acid red B can be reduced on carbon cloth and titanium oxide cathode. The charge transfer resistance and diffusion resistance of titanium oxide are 10 惟 ~ 12 惟, which is much smaller than that of carbon cloth (588 惟). 3411 惟, which indicates that titanium oxide is more favorable to electron transfer and material diffusion than carbon cloth, which is due to the three-dimensional porous structure, which is dominated by large and mesoporous distribution. This structure is beneficial to the transport and migration of substances on its surface and can provide more active sites for the reduction of acid red B. The effect of the key operation parameters of MEC on the reduction of acid red B and the performance of the system is also investigated. The results show that the applied voltage of acid red B is 0.5 V. When the cathode pH is 7.0 and the concentration is below 400 mg / L, the treatment time is shorter, the Coulomb efficiency is higher and the energy consumption is lower. The purpose of high efficiency treatment of acid red B wastewater. Finally, the electrochemical stability of titanium oxide cathode was studied. The results showed that in acidic or corrosive solution containing chloride ion. The corrosion current density of titanium oxide electrode increases very slowly with the increase of electrolyte solubility, which indicates that titanium oxide material has strong corrosion resistance and is suitable for long-term operation in electrochemical system.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X788

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本文編號(hào)：1441560