NiO/Mn_(0.3)Cd_(0.7)S合成及其光催化页岩气返排废水制氢性能研究  

Synthesis of NiO/Mn_(0.3)Cd_(0.7)S and its decomposition of shale gas backflow wastewater producing hydrogen

作　　者：康子怡 王婧茹 郝姿曼 徐龙君 KANG Ziyi;WANG Jingru;HAO Ziman;XU Longjun(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制全国重点实验室,重庆400044

出　　处：《燃料化学学报(中英文)》2025年第3期393-402,共10页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金(52474195)资助。

摘　　要：本研究将水热法和煅烧法相结合成功制备了一种p-n型NiO/Mn_(0.3)Cd_(0.7)S复合光催化剂,通过测试其在页岩气返排废水中的产氢效果评价样品的光催化产氢性能,并结合XRD、SEM、UV-vis DRS等表征手段对样品的结构、形貌和光学性能进行分析。结果表明,NiO的引入显著提高了Mn_(0.3)Cd_(0.7)S的可见光响应能力;质量分数为15%的NiO/Mn_(0.3)Cd_(0.7)S在页岩气返排废水中展现出最佳的光催化产氢性能,产氢速率高达20416.7μmol/(g·h),约为Mn_(0.3)Cd_(0.7)S单样的1.9倍。这种优异的光催化产氢性能得益于NiO/Mn_(0.3)Cd_(0.7)S间p-n型异质结的形成,有效促进了光生载流子的分离,提高了光催化产氢活性。Single photocatalysts generally suffer from issues such as easy recombination of photogenerated carriers and photocorrosion.The rational design of heterostructures has emerged as a critical strategy for enhancing the separation efficiency of photogenerated carriers and the photocatalytic activity of semiconductor photocatalysts.In this work,a novel p-n type NiO/Mn_(0.3)Cd_(0.7)S heterojunction composite photocatalyst is successfully prepared using a combination of hydrothermal and calcination methods.To thoroughly analyze the structure,morphology,and optical properties of the NiO/Mn_(0.3)Cd_(0.7)S composite,we employed a series of characterization techniques,including X-ray diffraction(XRD),scanning electron microscopy(SEM),and ultraviolet-visible spectroscopy(UV-vis DRS),etc.Additionally,0.35 mol/L Na_(2)S·9H_(2)O and 0.25 mol/L Na_(2)SO_(3) are used as sacrificial agents,with shale gas backflow wastewater serving as the reaction medium for hydrogen production experiments to evaluate the photocatalytic hydrogen production performance of the composite.The experimental results demondtrate that NiO and Mn_(0.3)Cd_(0.7)S are successfully combined to form a hererojunction,and the introduction of NiO significantly improved the visible light responsiveness of Mn_(0.3)Cd_(0.7)S.Specifically,the NiO/Mn_(0.3)Cd_(0.7)S composite with a NiO mass fraction of 15%(hereafter,15NOMCS)exhibits the best photocatalytic hydrogen production performance in shale gas backflow wastewater,with a hydrogen production rate of 20416.7µmol/(g·h),which is approximately 1.9 times higher than that of the single sample of Mn_(0.3)Cd_(0.7)S.Moreover,after conducting five consecutive hydrogen production cycling experiments,the hydrogen yield of the 15NOMCS composite maintained 94.6% of the initial hydrogen production amount,demonstrating excellent stability and reusability of the composite in photocatalytic hydrogen production applications.Compared to pure Mn_(0.3)Cd_(0.7)S,the characterization results of 15NOMCS shows that the photoluminescence

关 键 词：Mn_(0.3)Cd_(0.7)S NIO 异质结 页岩气返排废水 光催化产氢 

分 类 号：X703.1[环境科学与工程—环境工程]