【摘要】：水污染作為環(huán)境污染的重要組成部分,對人們正常有序的生活與生產(chǎn)影響深遠(yuǎn),有機(jī)廢水中存在的大量難生物降解而且毒性很高的低濃度酚類有機(jī)污染物,嚴(yán)重影響人們的用水安全。針對單一光催氧化技術(shù)與吸附凈化技術(shù)在去除水體中有機(jī)污染物中的弊端,首先通過化學(xué)還原法制備了石墨烯雜化氧化鋅復(fù)合材料(ZnO/rGO),通過表征證明了ZnO與rGO之間存在相互作用,進(jìn)而將石墨烯雜化氧化鋅(Zn O/rGO)與大量石墨烯進(jìn)行復(fù)合制備了具有宏觀結(jié)構(gòu)的石墨烯雜化氧化鋅復(fù)合水凝膠(ZnO/rGO-rGH)。當(dāng)ZnO/rGO中石墨烯的負(fù)載量為0.5 wt.%時(shí),12 min內(nèi)對苯酚的光降解效率高達(dá)98%,對比單體ZnO的光降解效率提升效果為2.5倍,石墨烯與Zn O形成的表面雜化結(jié)構(gòu)有利于將光生電子快速轉(zhuǎn)移到石墨烯上,成倍提高了ZnO的光催化活性。復(fù)合水凝膠吸附凈化雙酚A的過程符合準(zhǔn)二級動(dòng)力學(xué)方程模型,吸附等溫線符合Langmuir等溫線模型;ZnO/rGO-rGH吸附光催化協(xié)同作用對溶液中雙酚A的凈化效率高達(dá)100%,實(shí)現(xiàn)了對水體中酚類污染物的徹底凈化,宏觀水凝膠結(jié)構(gòu)具有容易回收的特點(diǎn),吸附光催化協(xié)同凈化雙酚A重復(fù)利用5次后的凈化效率依然可以達(dá)到90%左右,可以有效解決粉體光催化難以回收的難題。通過研究ZnO/rGO-rGH吸附光催化協(xié)同作用對水體中不同初始濃度與不同流速下的雙酚A凈化作用,發(fā)現(xiàn)復(fù)合水凝膠可以在16 h內(nèi)實(shí)現(xiàn)對流速0.48 m L/min,濃度為10 mg·L-1的雙酚A徹底凈化,而ZnO/rGO-rGH復(fù)合水凝膠通過吸附凈化作用實(shí)現(xiàn)徹底凈化雙酚A只能維持4 h。說明復(fù)合水凝膠(ZnO/rGO-rGH)吸附光催化協(xié)同作用不僅可以有效去除靜態(tài)下水體中的有機(jī)污染物,對流動(dòng)態(tài)下水體中的有機(jī)污染物凈化效果同樣具有顯著優(yōu)勢。
[Abstract]:As an important part of environmental pollution, water pollution has a profound impact on people's normal and orderly life and production. There are a large number of low concentration phenolic organic pollutants which are difficult to biodegrade and highly toxic in organic wastewater. Seriously affect people's water safety. In view of the disadvantages of single photocatalytic oxidation and adsorption purification in the removal of organic pollutants in water, graphene hybrid zinc oxide composites (ZnO/rGO) were prepared by chemical reduction method. The interaction between ZnO and rGO was proved by characterization, and then graphene hybrid zinc oxide (Zn O/rGO) was combined with a large amount of graphene to prepare graphene hybrid zinc oxide composite hydrogel (ZnO/rGO-rGH) with macrostructure. When the loading amount of graphene in ZnO/rGO was 0.5 wt.%, the photodegradation efficiency of phenol reached 98% in 12 min, and the photodegradation efficiency of monomeric ZnO was 2.5 times higher than that of monomer ZnO. The surface hybrid structure formed by graphene and Zn O is conducive to the rapid transfer of photogenerated electrons to graphene, which greatly improves the photocatalytic activity of ZnO. The process of adsorption and purification of bisphenol A by composite hydrogel accords with the quasi-second-order kinetic equation model, and the adsorption isotherm conforms to the Langmuir isotherm model. The synergistic effect of ZnO/rGO-rGH adsorption photocatalysis on the purification of bisphenol A in solution was as high as 100, which realized the thorough purification of phenolic pollutants in water, and the macroscopical hydrogel structure was easy to recover. The purification efficiency of bisphenol A can still reach 90% after 5 times of repeated use of adsorbent photocatalysis, which can effectively solve the difficult problem of photocatalytic recovery of powder. By studying the synergistic effect of ZnO/rGO-rGH adsorption photocatalysis on the purification of bisphenol A in water with different initial concentration and different flow rate, it was found that the combined hydrogel could achieve the optimal flow rate of 0.48 mL / min within 16 h. The concentration of 10 mg L ~ (-1) bisphenol A was completely purified, while that of ZnO/rGO-rGH compound hydrogel was only maintained for 4 h by adsorption and purification. The results show that the synergistic effect of photocatalytic adsorption of composite hydrogels (ZnO/rGO-rGH) not only can effectively remove organic pollutants in water under static conditions, but also has significant advantages under convection dynamic conditions.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X52;O648.17

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相關(guān)博士學(xué)位論文 前1條

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本文編號：2303197