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Anion intercalated layered-double-hydroxide structure for efficient photocatalytic NO remove

Green Energy & Environment 2019年第3期4卷 270-277页

作者： wangchen huo Tong Cao Xiaoying Liu Weina Xu Biqin Dong Yuxin Zhang Fan Dong State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research Center for Environmental Science&Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationCollege of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China College of Physics Chongqing UniversityChongqing 401331China e Guangdong Provincial Key Laboratory of Durability for Marine Civil EngineeringShenzhen UniversityShenzhen 518060China

Due to the easily controllable interlayer anions, metal cation composition proportion and thickness, which is beneficial to modify surface chemical state and tune bandgap, layered double hydroxides(LDHs) have great promising potential for photocatalytic applications. In this study,we have successfully synthesized the ZnAl–LDH intercalated the single anion between ZnAl cationic interlayer without anionic impurities by using a facile calcining and reconstructing routes. The electron structure and surface chemical state of the prepared products have been investigated by combining the DFT calculation and experimental characterization methods. UV–vis DRS was used to certify the light absorption of the prepared products, and we performed the DFT calculation to demonstrate the density of state and activation of reactant. These results suggested that the ZnAl–LDH–CO3 possessed the more proper band structure and superior ability to activate NO and O2 for accelerating the photocatalytic NO oxidation activity. Moreover, the in situ DRIFTS with dynamically monitoring intermediates and products over the ZnAl–LDH–CO3 was adopted to declare the photocatalytic NO oxidized process during the photocatalytic reaction process. This work illustrated the influence of different interlayer anions to the electron structure and surface chemical state of ZnAl–LDH structure through the experimental verification combined DFT calculation and the photocatalytic NO oxidized process via in situ DRIFTS analyzing, which would provide a novel way to design and fabricate the efficient photocatalysis, and understand the reaction process.

关键词： Photocatalytic NO oxidation ZnAl–LDH Reaction process and mechanism In situ DRIFTS DFT calculation

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Melamine sponge derived porous carbon monoliths with NiMn oxides for high performance supercapacitor

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中国化学快报：英文版 2020年第9期31卷 2245-2248页

作者： Qianyuan Shan wangchen huo Man Shen Chuan Jing Yan Peng Huayan Pu Yuxin Zhang State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research Institute of USV Engineering Shanghai UniversityShanghai 200444China

Supercapacitors with good electrochemical performance and flexibility are in great *** this paper,the concept of preparing 3D porous carbon monoliths via direct calcination of melamine sponge is *** preparation method is simple and has good control of the *** carbon composite nickel-manga nese oxides can be obtained by hydrothermal method followed with *** electrochemical performances were tested and porous carbon monoliths with NiMn oxides exhibited a specific capacitance of 870 F/g in 1 mol/L KOH at a charge/discharge current density of 0.5 A/g and a capacity retention of 89.9% after 5000 times charge and discharge.

关键词： NiMn oxides Porous carbon Supercapacito Electrochemical performance Melamine sponge

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Compulsive malposition of birnessite slab in 2D-Parallel birnessite on β-MnO_(2) networks for enhanced pseudocapacitance performances

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Nano Materials Science 2021年第4期3卷 404-411页

作者： Shijin Zhua wangchen huo Tian Wang Kailin Li Xiaoying Liu Junyi Ji Hongchang Yao Fan Dong Yuxin Zhang Lili Zhang College of Materials Science and Engreering Chongqing University Chongqing 400044China Research Center for Environmental Science&Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu611731China Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationCollege of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067 China School of Chemical Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu610065PR China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou CiyHenan Province450001PR China

High electrochemically active bimessite is always desirable pseudocapacitive material for ***,two-dimensional(2D)compulsive malposition parallel bimessite standing on β-MnO_(2) interconnected networks have been *** to the retrition of β-MnO_(2),compulsi ve malposition,slippage of MnO6 slab,occured in bimessite resulting in weaken bi nding force between bimessi te slab and interlayer cations,which enhanced their electrochemical ***,the electrical conductivity of the structure was largely promoted by the 2D charge transfer route and double-exchange mechanism in bimessite,also leading to desirable electro-chemical *** on the fraction of as-prepared nanostructure,the par all bimessite exhibited good pseudocapacitance performance(660 F g^(-1))with high rate *** addition,the asymmetrice supercapacitor assembled by reduced graphene oxide(RGO)and as-prepared nanostructure,which respectively served as the negative and positive eletrode,delivered an energy density of 33.1 Wh kg^(-1) and a mad mum power density of 64.0 kW kg^(-1) with excellent cyeling stability(95.8% after 10000 cycles).Finally,the study opens new avenwes for synthesizing high eletrochemically actiwe bimessite structure for high-performance energy storage devices.

关键词： Parallel birnessite Double-exchange mechanism Supercapacitor Energy storage devices

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Facile construction of Bi2Mo3O12@Bi2O2CO3 heterojunctions for enhanced photocatalytic efficiency toward NO removal and study of the conversion process

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Chinese Journal of Catalysis 2020年第2期41卷 268-275页

作者： wangchen huo Tong Cao Weina Xu Ziyang Guo Xiaoying Liu Hong-Chang Yao Yuxin Zhang Fan Dong State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research Center for Environmental Science&Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731SichuangChina Department of Physics Chongqing UniversityChongqing 401331China Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationCollege of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

Charge separation and transformation are some of the key requirements for high-efficiency photocatalysis. The photocatalytic reaction mechanism provides a guideline for the development and commercialization of high-efficiency photocatalysts. In this study, we designed and favorably synthesized BMO@BOC heterojunctions via a facile solvothermal route and applied the heat treatment method for application in high-efficiency photocatalytic NO removal. More importantly, both continuous stream and intermittent stream methods with in situ diffuse reflectance infrared Fourier transform spectroscopy were applied to intuitively and dynamically investigate the adsorption process and oxidation process of NO removal over the photocatalyst surface. The intermediate products(NO-, NO2-, and NO2) were explicitly detected in both the adsorption process and oxidation process, whilst the final product(NO3-) appeared only in the oxidation process, owing to the separation, migration, and conversion of photoinduced electron-hole pairs.

关键词： Heterojunction NO removal Photocatalysis In situ DRIFTS Reaction process

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C掺杂纳米硅藻土@TiO2催化剂吸附-光催化降解油田废水

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材料导报 2020年第23期34卷 23027-23032页

作者：王薇刘竟成霍旺晨王均王芊卉重庆科技学院石油与天然气工程学院重庆401331 复杂油气田勘探开发重庆市重点实验室重庆401331 重庆大学材料与工程学院重庆400044

硅藻土@TiO2复合材料已被证明对液态和气态的有机污染物如染料、甲醛等具有较高的吸附能力、光催化活性和重复使用性,而C掺杂则能够调控TiO2的能带结构并拓展其吸收范围至可见光区域。本研究以四氟化钛为前驱体,采用简单的水热合成法制... 详细信息

硅藻土@TiO2复合材料已被证明对液态和气态的有机污染物如染料、甲醛等具有较高的吸附能力、光催化活性和重复使用性,而C掺杂则能够调控TiO2的能带结构并拓展其吸收范围至可见光区域。本研究以四氟化钛为前驱体,采用简单的水热合成法制备了硅藻土@TiO2复合材料,并以葡萄糖为碳源,通过焙烧的方法得到C掺杂硅藻土@TiO2光催化剂,探索了C掺杂纳米硅藻土@TiO2在可见光下对油田废水中有机污染物的去除效果。研究表明,C的掺杂并未使硅藻土@TiO2的形貌发生改变,产物保持了丰富的孔隙结构,TiO2颗粒较为均匀地负载在硅藻土上;同时,紫外-可见光谱证实了C掺杂使得材料的禁带宽度明显减小。根据吸附-光催化测试结果,C掺杂量为20%、焙烧时间为3 h的光催化剂样品,在吸附20 min+光照射75 min后可使油田废水的COD降低82.59%,其去除污染物效果显著优于纯硅藻土@TiO2。

关键词：碳掺杂纳米硅藻土@TiO2 吸附可见光催化油田废水化学需氧量(COD) 带隙调控

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锰基低温NH 3-SCR脱硝催化剂的研究概述

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材料导报 2021年第13期35卷 13085-13099页

作者：郭梓阳霍旺晨张育新任山杨剑重庆大学材料科学与工程学院重庆400044

氨气选择性催化还原技术(NH_(3)-SCR)因利用NH_(3)作为还原剂实现NO_(x)的高效转化而受到广泛关注。虽然V_(2)O_(5)-WO_(3)(MoO_(3))/TiO_(2)催化剂已经投入商业化应用,但为了满足更高和更复杂的实际性应用需求,特别是针对低温脱硝催化... 详细信息

氨气选择性催化还原技术(NH_(3)-SCR)因利用NH_(3)作为还原剂实现NO_(x)的高效转化而受到广泛关注。虽然V_(2)O_(5)-WO_(3)(MoO_(3))/TiO_(2)催化剂已经投入商业化应用,但为了满足更高和更复杂的实际性应用需求,特别是针对低温脱硝催化剂的开发仍然刺激着新型催化剂的发展。在诸多金属氧化物催化剂中,锰氧化物由于具有多变的阳离子价态、表面不稳定氧和优异的氧化还原性能,在低温NH_(3)-SCR反应中展现出巨大的潜力。然而,目前锰基脱硝催化剂的效率仍受制于NO_(x)的转化率、N_(2)选择性、工作温度窗口以及失活物质(SO_(2)和H_(2)O、碱/碱土金属、重金属等)的影响。因此,近年来研究者们主要针对以上四个方面致力于提高锰基低温催化剂的性能,并取得了丰硕的成果,在充分利用锰氧化物优势的前提下大幅提升了其在低温下的工作效率。除了研究单一锰氧化物的效率外,研究者们通过水热法、水浴法、浸渍法等多种合成方法将过渡金属和稀土金属两类元素用于锰氧化物的修饰,复合和掺杂修饰之后所得的多元金属氧化物解决以上四个方面问题的能力显著提升。此外,通过研究负载锰氧化物的不同基底材料,如TiO_(2)、Al_(2)O_(3)、碳材料和无机非金属矿物等,也可以实现催化剂的效率和稳定性的提高。同时,通过深入探究锰基低温催化剂的相关反应机制,包括“Langmuir-Hinshelwood”机制、“Eley-Rideal”机制和“Fast SCR”反应机制,能够对提升催化剂的效率做出理论指导。文中主要总结了近年来研究人员对提升锰基低温催化剂的工作效率而做出的努力,分别介绍了锰基催化剂的挑战、针对锰氧化物的调控和相关反应机理等,概述了锰基低温催化剂所面临的问题并做出了展望,以期为制备高效稳定和环境友好的低温脱硝催化剂提供参考。

关键词：选择性催化还原锰氧化物低温脱硝

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二氧化锰与二维材料复合应用于超级电容器

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物理化学学报 2020年第2期36卷 46-70页

作者：王易霍旺晨袁小亚张育新重庆大学材料科学与工程学院重庆400044 重庆交通大学材料科学与工程学院重庆400074

现如今世界正面临着与能源相关的一系列问题与挑战,科学家们致力于研究绿色高性能的能量存储器件以适应当前乃至以后长久可持续创新发展的需要。超级电容器作为一种新型的绿色能源储存装置,具有功率密度大、理论比电容高、充放电速度快... 详细信息

现如今世界正面临着与能源相关的一系列问题与挑战,科学家们致力于研究绿色高性能的能量存储器件以适应当前乃至以后长久可持续创新发展的需要。超级电容器作为一种新型的绿色能源储存装置,具有功率密度大、理论比电容高、充放电速度快、循环寿命长、安全性高、环境友好且经济等优点,为人类解决能源危机提出了可能。电极材料是影响超级电容器性能的重要因素。近些年,由于二氧化锰基超级电容器具有理论比电容高、化学稳定性好、环境友好等特点被广泛研究。同时多种二维材料也继石墨烯后被相继用作超级电容器电极材料,具有二维结构特征材料在提高双电层电容器的能量密度、改善赝电容电容器方面发挥着重要作用。实现高比电容和高倍率性能,将二氧化锰与二维材料复合将不失为一个有前景的选择。本文系统介绍了以石墨烯为代表的各类二维材料与二氧化锰复合物在超级电容器中的应用研究,并聚焦于这些二维材料与二氧化锰复合后所展现的优异电化学性能。

关键词：二氧化锰二维材料纳米材料超级电容器电极材料

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