(1. 江西理工大學 冶金與化學工程學院，贛州 341000；
2. 江西理工大學 信息工程學院，贛州 341000)
摘 要: 采用研磨-煅燒法在ZnS中復合不同含量的WO3(0.5%~8%，質(zhì)量分數(shù))，形成WO3/ZnS異質(zhì)結(jié)光催化劑，利用N2物理吸附、X射線衍射(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)、紫外可見漫反射光譜(UV-vis DRS)、紅外光譜(FT-IR)、光電子能譜(XPS)和光致發(fā)光譜(PL)等對合成的樣品進行了表征；考察不同WO3含量樣品對ZnS的結(jié)晶度、比表面積、表面羥基、光吸收性能的影響，并以λ=254 nm的紫外光為光源，評價該催化劑光催化降解酸性橙Ⅱ的活性，考察WO3復合對WO3/ZnS樣品光催化性能的影響。結(jié)果表明：WO3的復合可抑制ZnS晶粒在煅燒過程中的長大，同時提高催化劑的比表面積和催化劑表面的羥基數(shù)量，并能有效地抑制光生電子與空穴的復合。當復合1%WO3(質(zhì)量分數(shù))，所制備的WO3/ZnS催化劑的活性最高，比純ZnS的活性提高了1.8倍。其原因是復合樣品具有較好的組織結(jié)構(gòu)的性能，同時，形成的WO3/ZnS異質(zhì)結(jié)有利于光生電子與空穴的分離，從而顯著提高光催化劑的脫色活性和穩(wěn)定性。
關(guān)鍵字: 研磨-煅燒; ZnS；WO3 耦合；異質(zhì)結(jié)；光催化；染料
（1. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. School of Information Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:WO3 with different concentrations (0.5%, 1%, 2%, 4%, 8%) were coupled with ZnS by a grinding-calcination method and WO3/ZnS heterostructured photocatalyst was obtained. The prepared samples were characterized by N2- physical adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier Transform Infrared spectroscopy (FT-IR), UV-visible spectroscopy, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) spectroscopy. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of acid orange II under UV light (λ=254 nm) irradiation. The results show that the coupling of WO3 can suppress the growth of ZnS crystals during the process of calcination, increase the surface area and enrich the surface OH groups of the sample. Moreover, the presence of WO3 restrains the recombination rate of photo generated e/h+ pairs. The photocatalytic activity of WO3/ZnS composite photocatalyst with 1% WO3 (mass fraction) increases about 1.8 times than that in pure ZnS. The increase of photocatalytic activity and stability is attributed to the improved texture property. Moreover, the formation of WO3/ZnS heterostructure greatly promotes the separation of e/h+ pairs.
Key words: grinding-calcination; ZnS; WO3 coupling; heterostructure; photocatalytic; dyes
