發(fā)布時(shí)間：2018-05-27 02:16

  本文選題：納米硫化銅 + 多級(jí)花狀��； 參考：《天津大學(xué)》2015年碩士論文

【摘要】：硫化銅納米材料展現(xiàn)出優(yōu)異的光學(xué)、電學(xué)、光電、化學(xué)等特性,在新能源、生物醫(yī)藥、環(huán)境工程等行業(yè)具有重要的應(yīng)用價(jià)值,開發(fā)新形貌新性能的納米硫化銅成為該領(lǐng)域的研究熱點(diǎn)。本文采用簡(jiǎn)單的水熱法制備了多級(jí)花狀、管狀、六角片狀納米硫化銅。研究了溫度、時(shí)間、濃度、銅源、硫源、保護(hù)劑等因素對(duì)產(chǎn)物結(jié)構(gòu)、形貌和粒徑的影響,利用X-射線衍射儀、掃描電子顯微鏡、透射電子顯微鏡等儀器對(duì)其進(jìn)行表征和分析,探討了產(chǎn)物硫化銅納米顆粒的光學(xué)性質(zhì)及其催化降解性能。以氯化銅為銅源,硫脲為硫源,聚乙二醇為保護(hù)劑,合成了由納米片層疊交錯(cuò)構(gòu)成的粒徑約5μm的多級(jí)花狀納米硫化銅;將硫源換作硫代乙酰胺,不添加任何保護(hù)劑的條件下,得到直徑約1μm,長(zhǎng)20~30μm的管狀硫化銅,管壁由納米片組裝而成。選用多級(jí)花狀納米硫化銅顆粒為類芬頓試劑的核心成分,將其用于降解羅丹明B(RhB)的催化反應(yīng)中,在過(guò)氧化氫輔助下,2 h內(nèi)RhB的降解率達(dá)到91%;在pH=4~10的范圍內(nèi)該類芬頓試劑均保持較高的催化活性;動(dòng)力學(xué)研究表明,該催化降解反應(yīng)符合準(zhǔn)一級(jí)動(dòng)力學(xué)方程。對(duì)于管狀納米硫化銅對(duì)應(yīng)的催化體系,在相同條件下RhB的降解率為88%。多級(jí)花狀和管狀納米硫化銅用于光催化反應(yīng)中,展現(xiàn)出令人滿意的光催化活性,在2 h的觀測(cè)周期,RhB的降解率分別達(dá)到63%和55%。向水熱反應(yīng)體系中加入氨水,以聚乙烯吡咯烷酮(PVP)和十六烷基三甲基溴化銨(CTAB)為保護(hù)劑,獲得粒徑分別為70 nm和50 nm的六角片狀硫化銅,產(chǎn)物對(duì)應(yīng)的禁帶寬度數(shù)值為2.60 eV、2.45 eV。將六角片狀納米硫化銅顆粒和過(guò)氧化氫的組合用于降解RhB的反應(yīng),兩種粒徑的硫化銅顆粒對(duì)應(yīng)的體系中,77%和85%的RhB在2 h內(nèi)發(fā)生降解。
[Abstract]:Copper sulphide nanomaterials exhibit excellent optical, electrical, optoelectronic and chemical properties, and have important application value in new energy, biomedical, environmental engineering and other industries. The development of nano-copper sulfide with new morphology and new properties has become a research hotspot in this field. In this paper, multistage flowerlike, tubular and hexagonal copper sulfide nanocrystals were prepared by a simple hydrothermal method. The effects of temperature, time, concentration, copper source, sulfur source and protectant on the structure, morphology and particle size of the product were studied. The products were characterized and analyzed by means of X-ray diffractometer, scanning electron microscope, transmission electron microscope, etc. The optical properties and catalytic degradation properties of copper sulfide nanoparticles were investigated. Using copper chloride as copper source, thiourea as sulfur source and polyethylene glycol as protective agent, a multistage flower-shaped copper sulfide with a particle size of about 5 渭 m was synthesized by lamination of nanochips, and the sulfur source was replaced by thioacetamide without adding any protective agent. The tubular copper sulfide with a diameter of about 1 渭 m and a length of 2030 渭 m was obtained. Multistage flower-shaped nano-copper sulphide particles were selected as the core components of Fenton-like reagent and used in catalytic degradation of Rhodamine Bhh _ (B). The degradation rate of RhB reached 91h with the help of hydrogen peroxide, and the Fenton reagent kept high catalytic activity in the range of pH=4~10, and the kinetic study showed that the catalytic degradation was in accordance with the quasi first-order kinetic equation. For the corresponding catalytic system of tubular nano copper sulfide, the degradation rate of RhB is 88% under the same conditions. Multistage flower-shaped and tubular nano-copper sulfide showed satisfactory photocatalytic activity in photocatalytic reactions, and the degradation rates of RhB reached 63% and 55% respectively in the observation period of 2 h. Using polyvinylpyrrolidone (PVP) and cetyltrimethylammonium bromide (CTAB) as protective agents, hexagonal copper sulphide with particle size of 70 nm and 50 nm was obtained by adding ammonia into hydrothermal reaction system. The corresponding band gap of the product was 2.60 EV ~ 2.45 EV. The combination of hexagonal copper sulphide nanoparticles and hydrogen peroxide was used to degrade RhB. 77% and 85% of RhB were degraded within 2 h in the corresponding system of two kinds of copper sulfide particles.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ131.21;TB383.1

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本文編號(hào)：1939978