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Regulating the electronic structure of Ir single atoms by ZrO_(2)nanoparticles for enhanced catalytic oxidation of formaldehyde at room temperature

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Chinese Chemical Letters 2024年第7期35卷 200-205页

作者： Shiqi Peng Yongfang Rao Tan Li Yufei Zhang Jun-ji Cao shuncheng lee Yu Huang Key Laboratory of Aerosol Chemistry&Physics State Key Laboratory of Loess and Quaternary Geology(SKLLQG)Institute of Earth EnvironmentChinese Academy of Sciences(CAS)Xi’an 710061China School of Human Settlements and Civil Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Environmental Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China School of Environment and Energy South China University of TechnologyGuangzhou 51006China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100190China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China

Developing low-loading single-atom catalysts with superior catalytic activity and selectivity in formaldehyde(HCHO)oxidation at room temperature remains ***,ZrO_(2)nanoparticles coupled low-loading Ir single atoms in N-doped carbon(Ir_(1)-N-C/ZrO_(2))was *** optimal Ir_(1)-N-C/ZrO_(2)with 0.25 wt%Ir loading delivers the high HCHO removal and conversion efficiency(>95%)at 20℃,which is higher than that over Ir_(1)-N-C with the same Ir *** specific rate can reach 1285.6 mmol gIr^(-1)h^(-1),surpassing the Ir based catalysts reported to *** functional theory calculation results and electron spin resonance spectra indicate that the introduction of Zr O_(2)nanoparticles modulate the electronic structure of the Ir single atoms,promoting O_(2)activation to·O_(2)^(–).Moreover,the Ir-C-Zr channel is favorable for the dissociation of·O_(2)^(–)to active oxygen atom(*O),and further accelerates the transformation of HCHO and intermediates(dioxymethylene and formates)to CO_(2)and H_(2)*** work provides a facile strategy to design low-loading single-atom catalysts with high catalytic activity toward HCHO oxidation.

关键词： ZrO_(2)nanoparticles Ir single atoms Electronic structure Formaldehyde Catalytic oxidation

PM_(2.5) and PM_(10-2.5) chemical composition and source apportionment near a Hong Kong roadway

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Particuology 2015年第1期13卷 96-104页

作者： Yan Cheng shuncheng lee Zhaolin Gu Kinfai Ho Yunwei Zhang Yu Huang Judith C.Chow John G.Watson Junji Cao Renjian Zhang Department of Environmental Science and Technology School of Human Settlements and Civil EngineeringXi'an Jiaotong University State Key Laboratory of Loess Quaternary Geology Institute of Earth and EnvironmentChinese Academy of Sciences Department of Civil and Structural Engineering Research Center for Environmental Technology and ManagementThe Hong Kong Polytechnic University School of Public Health and Primary Care The Chinese University of Hong Kong Division of Atmospheric Sciences Desert Research Institute Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences

Twenty-four-hour PM2.5 and PM10 samples were collected simultaneously at a highly trafficked road-side site in Hong Kong every sixth day from October 2004 to September 2005. The mass concentrations of PM2.5, PMlo-2.5 （defined as PM10 - PM2.5）, organic carbon （OC）, elemental carbon （EC）, water-soluble ions, and up to 25 elements were determined. Investigation of the chemical compositions and potential sources revealed distinct differences between PM2.5 and PM10-2.5. The annual average mass concentrations were 55.5 ＋ 25.5 and 25.9±15.7μg/m^3 for PM2.5 and PM10-2.5, respectively. EC, OM （OM = OC × 1.4）, and ammonium sulfate comprised over -82% of PM2.5, accounting for -29%, -27%, and -25%, respectively, of the PM2.5 mass. Low OC/EC ratios （less than 1） for PM2.5 suggested that fresh diesel-engine exhaust was a major contributor. Seven sources were resolved for PM2.5 by positive matrix factorization （PMF） model, including vehicle emissions （-29%）, secondary inorganic aerosols （-27%）, waste incinera- tor/biomass burning （-23%）, residual oil combustion （-10%）, marine aerosols （-6%）, industrial exhaust （-4%）, and resuspended road dust （-1%）. EC and OM comprised only -19% of PM10-2.5. The average OC/EC ratio of PM10-2.5 was 7.8± 14.2, suggesting that sources other than vehicular exhaust were important contributors. The sources for PM10-2.5 determined by the PMF model included -20% traffic-generated resuspension （e.g., tire dust/brake linear/petrol evaporation）, -17% locally resuspended road dust, -17% marine aerosols, -12% secondary aerosols/field burning, and -11% vehicle emissions.

关键词： PM2.5 PM10-2.5 Roadside Chemical composition Source apportionment Hong Kong

Ultrasonic Spray Pyrolysis Synthesis of Nanocrystalline InVO4 Hollow Microspheres and Their Visible-Light-Driven Photocatalytic Oxidation of NO

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Ultrasonic Spray Pyrolysis Synthesis of Nanocrystalline InVO...

第十届全国气溶胶会议暨第六届海峡两岸气溶胶技术研讨会

作者： Kinfai Ho shuncheng lee Department of Civil and Structural Engineering Research Center for Environmental Technology and Management The Hong Kong Polytechnic University

In this study, nanocrystalline InVO4 hollow microspheres have been synthesized by an ultrasonic spray pyrolysis synthetic method directly. The products were systematically characterized XRD, XPS, SEM, TEM, DRS, and nitrogen adsorption-desorption isotherms. The photocatalytic activity of the as-prepared hollow spheres was evaluated on the degradation of gaseous NO at 400 part-per-billion level under visible light and compared with a bulk InVO4 counterpart synthesized with a hydrothermal method. Results revealed that the as-prepared InVO4 hollow spheres exhibited higher photocatalytic activity than InVO4 bulk powders under visible light irradiation. This photocatalytic activity enhancement could be attributed to the special hollow structures, which were favorable for the diffusion of intermediates and the reduced deactivation of photocatalyst in the photocatalytic reaction. Fourier transform infrared spectroscopy （FTIR） results confirmed the formation of nitrate acid on the InVO4 surface during the photocatalysis of NO in the gas phase, revealing that the oxidation of NO molecules was the major process in this photocatalytic reaction. Multiple runs of the photocatalytic NO removal indicated that the InVO4 hollow spheres were stable. This study presents a promising approach for scaling-up industrial production of InVO4 hollow spheres with potential applications in photocatalytic indoor air purification.

关键词： InVO4 NO Visible light Photocatalysis Indoor air purification

Impact of meteorological parameters and gaseous pollutants（SO2 and NO2） on PM2.5 and PM10 mass concentrations during 2010 in Xi’an,China

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Impact of meteorological parameters and gaseous pollutants（...

十一届全国气溶胶会议暨第十届海峡两岸气溶胶技术研讨会

作者： Ping Wang JunJi Cao Yongming Han Yu Huang shuncheng lee State Key Lab of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences Department of Civil and Environmental Engineering The Hong Kong Polytechnic University

PM2.5 and PM10 mass from quartz-fiber weight were obtained in Xi’an for two weeks of every month corresponding to January, April, July and October during 2010 at upwind district of Gaoling county（GLC）, downwind background station of Black river reservoir（BRR） and four urban sites. Annual average PM2.5 and PM10 mass concentrations were 140.9 ± 108.9 μg m-3, 257.8 ± 194.7μg m-3, respectively. Seasonally, high concentrations in wintertime and low ones during summertime were attributed to seasonal variations of meteorological parameters and cycle changes of precursors（SO2 and NO2）. Stepwise Multiple Linear Regression（MLR） analysis indicated that relative humidity is the main factor influencing on meteorological parameter. Sulfate of SO2 oxidation products are concentrated in fine mode of PM2.5 and nitrate of NO2 oxidation in coarse mode of PM10. Entry MLR analysis suggested that SO2 and NO2 contributed 48.6% and 33.9%, and 17.5% and 0.7% of the total PM2.5 and PM10, respectively. Trajectory cluster results indicated long distance air mass from northwest in winter（82.1%） and in spring（67.9%）, and short distance from surrounding provinces in summer（62.5%） and autumn（73.2%）. Potential Source Contribution Function（PSCF） analysis showed three day Dust storm（DS） came from Taklimakan Desert in Xinjiang and Gobi Desert in Inner Mongolia in spring. Remote sensing retrieval（OMI UV Aerosol Index（AI）, OMI tropospheric NO2 column of Aura and Aerosol Optical Depth（AOD） of MODIS TERRA） from Giovanni online tools of NASA Goddard Earth Sciences Data and Information Services Center（GES DISC） were verified results of observation on the ground to some extents.

关键词： Xi’an PM 2.5 and PM 10 meteorological parameters gaseous pollutants MLR PSCF

Investigation on the Enhanced Catalytic Degradation of Haze-causing Precursor Pollutants under Ambient Temperature

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Investigation on the Enhanced Catalytic Degradation of Haze-...

第十五届海峡两岸气胶技术研讨会

作者： Haiwei LI Long CUI shuncheng lee Yu HUANG Junji CAO Wingkei HO Department of Science and Environmental Studies The Education University of Hong Kong Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Key Lab of Aerosol Chemistry & Physics Institute of Earth EnvironmentChinese Academy of Sciences

By exploiting the degradation process of gas pollutants(VOCs,NO,NH,and SO) and secondary pollution product-O via catalytic titania composite coatings under room temperature,their mechanism and characteristics for restraining the formation of secondary aerosols will be ***,a series of sphere-like MnO-doped CeO catalysts(MnCe)O was synthesized to achieve a highly desired functionality of electron-transfer *** innovation is the creation of 2.1 wt.% colloidal TiO-supported MCO core/shell nanocomposites(TO–MCO) with a diameter of roughly 80 nm via a facile hydrothermal-assisted colloidal reflux condensation *** for the reaction under the synergetic influence of multiple factors such as TiO-coatings surface properties,polluting gas type,reactivity pathway at ambient temperature will be *** on this,the strong acid-site adsorption process in the presence of various polluting gas will be ***,by in-situ analyzing the composition and state of the haze-causing pollutant before and after room-temperature catalytic reaction,abundant superoxide radicals activated from surface oxygen species after capturing sufficient free electrons will be ***,the inhibition effect of the decreased pollutant gas concentration for the formation of the new particulates will be *** into account the degradation characteristics of room-temperature catalysts for gas pollutants,properties of active sites and interface crystalline structure will be specifically ***-term catalytic activity under room temperature will be enhanced by utilizing the super-hydrophilicity of the titania coatings.

关键词： Room-temperature catalytic degradation Haze-Causing Precursor Gas pollutants

Indoor and Outdoor Air Quality and Carbonaceous Characteristics of Aerosols at Residential Homes in Four Cities: Hong Kong, Shanghai, Xi’an, and Guangzhou

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Indoor and Outdoor Air Quality and Carbonaceous Characterist...

第十三届全国气溶胶会议

作者： Zhuozhi ZHANG shuncheng lee Long CUI Haiwei LI Yu HUANG Guangli Xiu Senchao Lai Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Key Lab of Aerosol Chemistry&Physics Institute of Earth EnvironmentChinese Academy of Science College of Resources and Environmental Engineering East China University of Science and Technology College of Environment and Energy South China University of Technology

This study investigated the indoor and corresponding outdoor air quality, as well as the carbonaceous fractions in PM2.5 particles at residential homes in Hong Kong, Shanghai, Xi’an and Guangzhou during winter/spring season from November 2016 to March *** different parameters including the mass concentration of PM2.5 particles, mixing ratio of CO, CO2 as well as TVOC have been ***-based PM2.5 samples were also collected for chemical *** sampling, information of the residential homes, including the room area, number of occupants, and occupational activities have been *** average mass concentrations（in μg/m3） of indoor PM2.5 were 34.0 ± 8.1, 50.1 ± 17.5, 78.7 ± 27.3, and 56.6 ± 18.4 in Hong Kong, Shanghai, Xi’an and Guangzhou, *** I/O ratios of PM2.5 particles larger than 1 were observed in Hong Kong（1.02） and Shanghai（1.30）, indicating the significance of indoor sources of air *** the average I/O ratios of PM2.5 particles in Xi’an（0.74） and Guangzhou（0.98） were less than 1, highlighting the influence of outdoor air *** activities such as smoking, incense burning, and cooking were proved to be significantly affecting the indoor air *** to the thermal/optical carbon analysis, the carbonaceous aerosols contributed about one-third of the total PM2.5 mass for both indoor and *** eight investigated carbonaceous fractions, OC2 and OC3, for which the major sources might be the indoor combustion activities, dominated in the mass ***1 fractions also counted for relatively high portion even in indoor samples, indicating the occurrence of particle infiltration and penetration from outdoor to indoor environment.

关键词： Indoor air quality PM2.5 Carbonaceous aerosol Diurnal variation Human influential factors

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西汉张安世墓葬M1墓室内的大气环境调查

文物保护与考古科学 2013年第2期25卷 69-76页

作者：曹军骥杨军昌胡塔峰 lee shuncheng 王新明 Ho Kinfai 董俊刚丁岩中国科学院地球环境研究所黄土与第四纪地质国家重点实验室陕西西安710075 西安交通大学全球环境变化研究院陕西西安710025 陕西省考古研究院陕西西安710054 陕西省文物保护研究院陕西西安710075 香港理工大学土木与结构工程系中国科学院地球化学研究所有机地球化学国家重点实验室广东广州510640 西安建筑科技大学建筑学院陕西西安710055

了解待发掘封闭墓葬内的大气环境,可为考古发掘和文物保存环境研究提供科学依据。西汉张安世墓园中的M1墓葬是一座未被盗扰的墓室,本研究在墓室开启前,有针对性地监测了墓室内的微气候参数和大气污染物。结果显示,相对于外界大气,密闭... 详细信息

了解待发掘封闭墓葬内的大气环境,可为考古发掘和文物保存环境研究提供科学依据。西汉张安世墓园中的M1墓葬是一座未被盗扰的墓室,本研究在墓室开启前,有针对性地监测了墓室内的微气候参数和大气污染物。结果显示,相对于外界大气,密闭的墓室内低温、高湿、缺氧,且酸性气态污染物浓度较低。因此,在考古发掘及后续保存文物时,应针对不同文物材料采取密闭容器、保湿、避光等措施,避免由于环境骤变导致文物的风化损坏。本研究建立的待发掘墓葬大气环境测试体系及基础数据,可为相关考古和文保工作提供有益的借鉴。

关键词：微气候气态污染物环境监测张安世墓

Source apportionment of VOCs and their impacts on surface ozone in an industry city of Baoji, Northwestern China

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Source apportionment of VOCs and their impacts on surface oz...

第十三届全国气溶胶会议

作者： Yonggang XUE Steven Sai Hang HO Yu HUANG Bowei LI Liqin WANG Wenting DAI Junji CAO shuncheng lee Key Laboratory of Aerosol Chemistry and Physics Institute of Earth EnvironmentChinese Academy of Sciences State Key Lab of Loess and Quaternary Geology(SKLLQG) Institute of Earth EnvironmentChinese Academy of Sciences Department of Science and Environmental Studies The Education University of Hong Kong Department of Environmental Science and Engineering Xi’an Jiaotong University Department of Civil and Environmental Engineering The Hong Kong Polytechnic University

Level of surface ozone(O) has been increasing continuously in China in recent years, while its contributors and formation pathways are less *** this study, distributions of volatile organic compounds(VOCs) and the roles on O pollution have been investigated in a typical industrial city of Baoji in Northwestern China by means of monitoring of their concentrations and other trace *** air samples have been collected at three sites according to urban function *** of VOCs in Weibin site, which near to industrial zone, was higher than most of other cities in China, and the ambient VOCs were dominated by aromatics and *** temporal variations of VOCs and O coincided with the surface wind, implying that the formation of O was impacted by both exports of plumes upwind and local photochemical *** of source apportionment indicated that industrial emission, vehicular exhaust, and solvent evaporation were three major pollution *** and aromatics contributed to the largest fractions of photochemical reactivity, suggesting the strong influences from industrial and traffic *** study presents the characteristic VOCs and other factors in the contribution of O formation in China.

关键词：

Characterizations of volatile organic compounds(VOCs) from vehicular emissions at roadside environment: The first comprehensive study in Northwestern China

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Characterizations of volatile organic compounds(VOCs) from v...

第十三届全国气溶胶会议

作者： Bowei LI Steven Sai Hang HO Yonggang XUE Yu HUANG Liqin WANG Yan CHENG Wenting DAI Haobin ZHONG Junji CAO shuncheng lee Key Laboratory of Aerosol Chemistry and Physics Institute of Earth EnvironmentChinese Academy of Sciences Department of Environmental Science and Technology School of Human Settlements and Civil EngineeringXi'an Jiaotong University State Key Lab of Loess and Quaternary Geology(SKLLQG) Institute of Earth EnvironmentChinese Academy of Sciences Division of Atmospheric Sciences Desert Research Institute Department of Civil and Environmental Engineering The Hong Kong Polytechnic University

Vehicular emission(VE) is one of the important anthropogenic sources for ground-level volatile organic compounds(VOCs) in both urban and suburban *** comprehensive campaign was conducted at an urban roadside in Xi’an, China in summer, 2016.A total of 57 VOCs, as known as critical surface ozone(O) precursors, and other trace gases were measured simultaneously during the sampling ***, a tracer of gasoline evaporation, was the most abundant VOC in the roadside samples, followed by isobutane and benzene, attributed to the largest composition(0%) of gasoline-fueled vehicles on the *** molar ratio of toluene/benzene(T/B) in our study(0.36) is far lower than the range reported in other cities, indicating the stronger contributions from diesel *** results of source apportionment achieved with positive matrix factorization(PMF) receptor model were highly consistent with the vehicles compositions, strongly evidenced that the precise characterization of the VE sources from those marker *** degrees of individual compound contributed to O production were weighed by ozone formation potential(OFP).Propylene(20%), 1-butene(11%) andiso-pentane(10%) were the top three contributors at the *** information of this study complements the VOCs database regarding to the VE sources in Northwestern China.

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