本文關(guān)鍵詞：納米氧化鋅及其復(fù)合材料光催化去除水中低濃度氨氮研究　出處：《南京理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光催化 納米ZnO 聚甲基丙烯酸甲酯 氧化石墨烯 氨氮

【摘要】：農(nóng)業(yè)污染造成污水中氨氮超標(biāo),過量的氨氮會(huì)引起水體富營養(yǎng)化,使藻類大量增殖,對(duì)水體生態(tài)平衡和人類健康產(chǎn)生嚴(yán)重的危害。本課題制備了 ZnO、ZnO-PMMA(基甲基丙烯酸甲酯)和Cu-ZnO-GO(氧化石墨烯)三種光催化材料,研究了催化材料對(duì)氨氮廢水的去除效果。為納米半導(dǎo)體光催化治理氨氮廢水提供了理論依據(jù)。本課題主要從下列方面進(jìn)行:(1)水熱法制備ZnO,考察其光催化去除水中低濃度氨氮的能力,探究了光催化機(jī)理。納米ZnO為六方晶系纖鋅礦結(jié)構(gòu),結(jié)晶度好,光催化去除初始濃度為50 mg·L-1的氨氮廢水,125W汞燈365 nm光照作用下,催化劑用量為2.0g·L-1 pH=10.0,溫度30℃,光照4 h,氨氮去除率可達(dá)64.8%,反應(yīng)產(chǎn)物大部分為氮?dú)狻?2)水熱法制備ZnO,通過熱粘固法制得ZnO-PMMA復(fù)合材料,考察其光催化去除水中低濃度氨氮的能力。在125 W汞燈紫外光照作用下,復(fù)合材料ZnO-PMMA去除初始濃度為50mg.L-1的氨氮廢水,催化劑用量為1.0g.L-1 pH=10.0,溫度30℃,光照4 h,氨氮去除率可達(dá)66%。PMMA與納米ZnO具有協(xié)同效應(yīng),提高了分散性和紫外光利用率,材料回收簡單,重復(fù)利用性好,相同條件下對(duì)氨氮的去除率從41%提高到66%。(3)兩步水熱法制備Cu-ZnO-GO復(fù)合材料,考察其光催化去除水中低濃度氨氮的能力。在3盞30 W日光燈下,Cu-ZnO-GO去除初始濃度為50 mg·L-1的氨氮廢水,催化劑用量為2.0g·L-1 pH=10.0,溫度30℃,光照2h,氨氮去除率可達(dá)79.6%,相同條件下ZnO和Cu-ZnO分別為13.3%、48.1%。Cu摻雜拓寬其光響應(yīng)范圍,GO的負(fù)載提高了催化性能,為ZnO相關(guān)材料處理實(shí)際污水中的氨氮提供了必要的基礎(chǔ)。
[Abstract]:Agricultural pollution caused excessive ammonia nitrogen in sewage, excessive ammonia nitrogen will cause eutrophication of water body, make algae proliferate, and cause serious harm to water ecological balance and human health. ZnO was prepared in this paper. ZnO-PMMA (methyl methacrylate) and Cu-ZnO-GOO (graphene oxide) are photocatalytic materials. The removal efficiency of ammonia nitrogen wastewater by catalytic materials was studied, which provided a theoretical basis for the photocatalytic treatment of ammonia nitrogen wastewater by nanometer semiconductor. In this paper, ZnO was prepared by hydrothermal method from the following aspects. The photocatalytic removal of ammonia nitrogen from water was investigated and the photocatalytic mechanism was investigated. The nanocrystalline ZnO is hexagonal wurtzite structure with good crystallinity. Photocatalytic removal of NH _ 3-N wastewater with initial concentration of 50 mg 路L ~ (-1) was carried out under the irradiation of 125 W Hg lamp at 365 nm, and the amount of catalyst was 2.0 g 路L ~ (-1) pH=10.0. At 30 鈩，

本文編號(hào)：1386919