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photoreduction adjusted surface oxygen vacancy of Bi_(2)MoO_(6) for boosting photocatalytic redox performance

Frontiers of Chemical Science and Engineering 2023年第12期17卷 1937-1948页

作者： Tie Shi Hailong Jia Yanmei Feng Bo Gong Daimei Chen Yu Liang Hao Ding Kai Chen Derek Hao Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China School of Materials Science and Technology Shenyang University of Chemical TechnologyShenyang 110142China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoringand Pollution Control School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)NSW 2007Australia

In this study, Bi_(2)MoO_(6) with adjustable rich oxygen vacancies was prepared by a novel and simple solvothermal-photoreduction method which might be suitable for a large-scale production. The experiment results show that Bi_(2)MoO_(6) with rich oxygen vacancies is an excellent photocatalyst. The photocatalytic ability of BMO-10 is 0.3 and 3.5 times higher than that of the pristine Bi_(2)MoO_(6) for Rhodamine B degradation and Cr(VI) reduction, respectively. The results display that the band energy of the samples with oxygen vacancies was narrowed and the light absorption was broadened. Meanwhile, the efficiency of photogenerated electron-holes was increased and the separation and transfer speed of photogenerated carriers were improved. Therefore, this work provides a convenient and efficient method to prepare potential adjustable oxygen vacancy based photocatalysts to eliminate the pollution of dyes and Cr(VI) in water.

关键词： Bi_(2)MoO_(6) oxygen vacancies photoreduction Cr(VI) RhB

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Mercury photoreduction and photooxidation in lakes：Effects of filtration and dissolved organic carbon concentration

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Journal of Environmental Sciences 2018年第6期30卷 151-159页

作者： Nelson J.O’Driscoll Emma Vost Erin Mann Sara Klapstein Robert Tordon Matthew Lukeman Department of Earth & Environmental Science Acadia University Wolfville B4P 2R6 Nova Scotia Canada Environment Canada Dartmouth Nova Scotia Canada Department of Chemistry Acadia University Wolfville B4P 2R6 Nova Scotia Canada

Mercury is a globally distributed, environmental contaminant. Quantifying the retention and loss of mercury is integral for predicting mercury-sensitive ecosystems. There is little information on how dissolved organic carbon（DOC） concentrations and particulates affect mercury photoreaction kinetics in freshwater lakes. To address this knowledge gap,samples were collected from ten lakes in Kejimkujik National Park, Nova Scotia（DOC： 2.6–15.4 mg/L）. Filtered（0.2 μm） and unfiltered samples were analysed for gross photoreduction, gross photooxidation, and net reduction rates of mercury using pseudo first-order curves. Unfiltered samples had higher concentrations（p = 0.04） of photoreducible divalent mercury（Hg（II）RED）（mean of 754 ± 253 pg/L） than filtered samples（mean of 482 ± 206 pg/L）;however, gross photoreduction and photooxidation rate constants were not significantly different in filtered or unfiltered samples in early summer. DOC was not significantly related to gross photoreduction rate constants in filtered（R2= 0.43; p = 0.08） and unfiltered（R2= 0.02; p = 0.71） samples; DOC was also not significantly related to gross photooxidation rate constants in filtered or unfiltered samples. However, DOC was significantly negatively related with Hg（Ⅱ）RED in unfiltered（R2= 0.53; p = 0.04）, but not in filtered samples（R2= 0.04;p = 0.60）. These trends indicate that DOC is a factor in determining dissolved mercury photoreduction rates and particles partially control available Hg（Ⅱ）RED in lake water. This research also demonstrates that within these lakes gross photoreduction and photooxidation processes are close to being in balance. Changes to catchment inputs of particulate matter and DOC may alter mercury retention in these lakes and could partially explain observed increases of mercury accumulation in biota.

关键词： Mercury photoreduction Photooxidation Dissolved organic carbon(DOC) Particulates Kejimkujik National Park

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Hydrogen-incorporated vanadium dioxide nanosheets enable efficient uranium confinement and photoreduction

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Nano Research 2022年第4期15卷 2943-2951页

作者： Huanhuan Liu Jia Lei Jiali Chen Ye Li Changyao Gong Shangjie Yang Yamin Zheng Ning Lu Yan Liu Wenkun Zhu Rong He State Key Laboratory of Environment-friendly Energy Materials National Co-innovation Center for Nuclear Waste Disposal and Environmental SafetySichuan Civil-military Integration InstituteSouthwest University of Science and TechnologyMianyang 621010China College of Chemistry and Materials Science Anhui Normal UniversityWuhu 241002China

Photocatalytic reduction of U(VI)represents a novel and effective manner for the removal of U(VI)pollutant from radioactive ***,we successfully incorporated hydrogen into VO_(2)nanosheets,which strengthened the interaction between VO_(2)and U(VI),thereby achieving a highly active and stable photocatalyst for U(VI)*** the increase of H content in hydric VO_(2)(H_(x)-VO_(2))nanosheets,the bandgap shrank from 2.29 to 1.66 eV,whereas the position of conduction bands remained more negative than the reduction potential of U(VI)/U(IV)(0.41 V ***).When irradiated by simulated sunlight,the U(VI)removal efficiency over H0.613-VO_(2)nanosheets reached up to 95.4%within 90 min,which largely outperformed 28.3%of pristine VO_(2)*** mechanistic study demonstrated that the hydroxylated surface gave rise to the balanced O confinement sites in VO_(2)(011),leading to the stabilized adsorption configuration and increased binding strength of UO_(2)^(2+)on H_(x)-VO_(2)nanosheets.

关键词： VO_(2)nanosheets hydroxylated surface confinement photoreduction uranium

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Nanorattle Au@PtAg encapsulated in ZIF-8 for enhancing CO2 photoreduction to CO

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Nano Research 2019年第3期12卷 625-630页

作者： Yuqun Su Haitao Xu Jiajia Wang Xikuo Luo Zhen-liang Xu Kefu Wang Wenzhong Wang State Key Laboratory of Chemical Engineering Membrane Science and Engineering R&D Lab Chemical Engineering Research Center East China University of Science and Technology (ECUST) 130 Meilong Road Shanghai 200237 China State Key Laboratory of High Performance Ceramics and Super Fine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences 1295 Dingxi Road Shanghai 200050 China

Imidazolate-based ZIF-8 catalysts M@ZIF-8 (M = Au NR, Au@Ag NR, or Au@PtAg NRT;NR = nanorod, NRT = nanorattle), were assembled. Au NRs acted as the core for the epitaxial growth of the Ag shell, and oxidative etching of Au@Ag NRs led to Au@PtAg NRTs with K2PQI4 aqueous soluti on. All metal nano rods (MNRs) and metal nano rattles (MNRTs) were well dispersed and fully en capsulated in ZIF-8. Au @ PtAg NRTs encapsulated in ZIF-8 could lead to enhanced stability and selectivity for catalytic applications, combining the advantages of ZIF-8 (tailorable porosity) with the high surface area and improved optical sensitivity of rod-shaped NRTs. The catalyst Au @ PtAg@ZIF-8 exhibited efficient catalytic activity and CO selectivity for the gas-phase photoreduction of CO2 with H2O.

关键词： imidazolate-based ZIF-8 core-shell nanorattle noble metal catalyst CO2 photoreduction

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Effects of typical algae species（Aphanizomenon flosaquae and Microcystis aeruginosa） on photoreduction of Hg2+ in water body

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Journal of Environmental Sciences 2019年第11期31卷 9-16页

作者： Rongguo Sun Yafei Mo Xinbin Feng Leiming Zhang Lin Jin Qiuhua Li State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang China School of Chemistry and Material Guizhou Normal University Guiyang China Air Quality Research Division Science and Technology Branch Environment and Climate Change Canada Toronto Ontario Canada

photoreduction characteristics of divalent inorganic mercury (Hg2+) in the presence of specific algae species are still not well *** experiments were conducted in the present study to identify the effects of different concentrations of living/dead algae species,including Aphanizomenon flosaquae (AF) and Microcystis aeruginosa (MA),on the photoreduction rate of Hg2+ under various light *** experimental results showed that percentage reduction of Hg2+ was significantly influenced by radiation wavelengths,and dramatically decreased with the presence of *** highest percentage reduction of Hg2+ was induced by UV-A,followed by UV-B,visible light and dark for both living and dead AF,and the order was dark > UV-A > UV-B > visible light for both living and dead *** were two aspects,i.e.,energy and attenuation rate of light radiation and excrementitious generated from algae metabolisms,were involved in the processes of Hg2+ photoreduction with the presence of algae under different light *** percentage reduction of Hg2+ decreased from 15% to 11% when living and dead AF concentrations increased by 10 times (from 106 to 105 cells/mL),and decreased from11% to ~9% in the case of living and dead MA *** can adsorb Hg2+ and decrease the concentration of free Hg2+,thus inhibiting Hg2+ photoreduction,especially under the conditions with high concentrations of *** significant differences were found in percentage reduction of Hg2+ between living and dead treatments of algae *** results are of great importance for understanding the role of algae in Hg2+ photoreduction.

关键词： Aphanizomenon flosaquae Microcystis aeruginosa photoreduction Divalent inorganic mercury (Hg2+)

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Increasing chloride concentration causes retention of mercury in melted Arctic snow due to changes in photoreduction kinetics

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Journal of Environmental Sciences 2018年第6期30卷 122-129页

作者： E.A.Mann S.E.Ziegler A.Steffen N.J.O'Driscoll Department of Environmental Science Acadia University Environmental Science Programme Memorial University of Newfoundland Environment and Climate Change Canada Science and Technology Branch Air Quality Research Division

Mercury（Hg） in the Arctic is a significant concern due to its bioaccumulative and neurotoxic properties, and the sensitivity of Arctic environments. Previous research has found high levels of Hg in snowpacks with high chloride（Cl-） concentrations. We hypothesised that Cl- would increase Hg retention by decreasing Hg photoreduction to Hg（0） in melted Arctic snow. To test this, changes in Hg photoreduction kinetics in melted Alert, NU snow were quantified with changing Cl- concentration and UV intensity. Snow was collected and melted in Teflon bottles in May 2014, spiked with 0–10 μg/g Cl-, and irradiated with 3.52–5.78 W·m-2 UV（280–400 nm）radiation in a Luz Chem photoreactor. photoreduction rate constants（k）（0.14–0.59 hr-1） had positive linear relationships with [Cl-], while photoreduced Hg amounts（Hg（Ⅱ）red） had negative linear relationships with [Cl-]（1287–64 pg in 200 g melted snow）. Varying UV and[Cl-] both altered Hg（Ⅱ）red amounts, with more efficient Hg stabilisation by Cl- at higher UV intensity, while k can be predicted by Cl- concentration and/or UV intensity, depending on experimental parameters. Overall, with future projections for greater snowpack Cl- loading,our experimental results suggest that more Hg could be delivered to Arctic aquatic ecosystems by melted snow（smaller Hg（Ⅱ）red expected）, but the Hg in the melted snow that is photoreduced may do so more quickly（larger k expected）.

关键词： Mercury photoreduction Arctic Melted snow

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Design of BiOBr_(0.25)I_(0.75) for synergy photoreduction Cr(Ⅵ) and capture Cr(Ⅲ) over wide pH range

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Chinese Chemical Letters 2022年第6期33卷 3053-3060页

作者： Lixia Jia Xin Tan Yanfang Li Yizhong Zhang Shiqian Cao Wei Zhou Xiang Huang Lequan Liu Tao Yu School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China School of Science Tianjin UniversityTianjin 300350China School of Science Tibet UniversityLhasa 850000China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

Conversion of hexavalent chromium(Cr(Ⅵ))to trivalent chromium(Cr(Ⅲ))is an effective way to reduce its environmental risk,especially via photoreduction ***,over a wide range of pH values,it is still a great challenge to achieve a high removal rate,and the disposal of produced Cr(Ⅲ)should be *** this work,we implemented a high removal rate at 98%for Cr(Ⅵ)and total chromium(Cr(T))over a wide pH range(4–10)through the synergistic effect of adsorption,photoreduction and immobilization on the surface of Bi OBr_(0.25)I_(0.75).The substitution of bromine by iodine reduced the adsorption energy of Cr(Ⅵ)on Bi OBr_(0.25)I_(0.75),promoting the adsorption of Cr(Ⅵ).Meanwhile,the introduced iodine upshifted the conduction band(CB),enhancing the reduction ability for Cr(Ⅵ)to Cr(Ⅲ).The negative surface of Bi OBr_(0.25)I_(0.75)can capture Cr(Ⅲ),achieving a high removal rate for Cr(T).The p H-independent feature for Cr(Ⅵ)and Cr(Ⅲ)removal make Bi OBr_(0.25)I_(0.75)a potential material for chromium-containing wastewater *** work provides an effective strategy for removing chromium over a wide p H range.

关键词： Adsorption photoreduction BiOBr_(0.25)I_(0.75) Chromium

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Rapid synthesis of MoS_(2)-Ag nanocomposites via photoreduction for optical tuning and surface-enhanced Raman scattering applications

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Journal of Materiomics 2023年第2期9卷 229-234页

作者： Yoonkyung Lee Eunpa Kim Hyeongkeun Kim Kyunghoon Kim School of Mechanical Engineering Sungkyunkwan UniversitySuwon16419Republic of Korea Samsung Electronics Semiconductor R&DAdvanced Manufacturing Engineering TeamPyeongtaek17786Republic of Korea Korea Electronics Technology Institute Seongnam13509Republic of Korea

Semiconductoremetal nanocomposites have been widely investigated to modify the intrinsic properties of materials used for optoelectronic devices and sensing *** this study,a method for rapid synthesis of MoS_(2)-Ag nanocomposites via laser-assisted photoreduction was *** the photoreduction process,we used AgNO_(3)solution as a metal *** laser irradiation,Ag ions were easily reduced on MoS_(2)by photo-generated electrons from MoS_(2).The optical properties of MoS_(2)-Ag nanocomposites were easily controlled by simple adjustment of the photoreduction *** investigate the surface-enhanced Raman scattering(SERS)effect of the MoS_(2)-Ag nanocomposites,the SERS spectra of methylene blue(MB)on MoS_(2)-Ag nanocomposites were measured,and the nanocomposites were found to enhance the Raman scattering intensity of MB up to~***,the laser-assisted photoreduction method has great potential for rapid synthesis and optical tuning of semiconductoremetal nanocomposites.

关键词： Molybdenum disulfide(MoS2) Silver(Ag) photoreduction Optical tuning Surface-enhanced Raman scattering(SERS)

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Colorful Silver/Carbon Nitride Composites Obtained by photoreduction

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Chemical Research in Chinese Universities 2020年第6期36卷 1136-1140页

作者： MENG Peng XU Jingsan School of Chemistry and Physics Science and Engineering FacultyQueensland University of TechnologyBrisbaneQLD 4000Australia

The Ag^+photoreduction by graphitic carbon nitride(g-CN)materials in a high concentration of Ag^+solution is reported,and a series of colorful Ag/g-CN composites is prepared and *** chromatic change correlates to the carbon nitride materials synthesized at different heating temperatures(CNr,where T means heating temperature),takingadvantage of the different photocatalytic activities of different *** mechanism beneath this phenomenon is attributed to two factors:the particle size of Ag NPs and the coordinate effect of Ag NPs on CNr ***,the multi-colors of Ag/g-CN composites display only on the CNr materials synthesized from heating melamine-cyanuric acid pre-cursor,but not on the CNr from heating pure *** color of the as-prepared Ag/g-CN composites can endure the corrosion of HNO;and ethanol,which shows a good chemical stability and may hint its application as chromophores.

关键词： Graphitic carbon nitride(g-CN) photoreduction Silver/g-CN composite

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Efficient photoreduction strategy for uranium immobilization based on graphite carbon nitride/activated carbon nanocomposites

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Chinese Chemical Letters 2022年第7期33卷 3581-3584页

作者： Shuyang Li Zhiwei Niu Duoqiang Pan Zhenpeng Cui Hewen Shang Jie Lian Wangsuo Wu Frontiers Science Center for Rare Isotopes Lanzhou UniversityLanzhou 730000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Key Laboratory of Special Function Materials and Structure Design Ministry of EducationLanzhou 730000China

Uranium removal from aqueous solutions using environmentally friendly photocatalytic technology is a novel approach for resource ***,carbon nitride/activated carbon composite materials(CN/AC)were investigated for U(Ⅵ)reduction under visible *** exceptional boost in photocatalytic activity was observed for CN/AC composites(up to 70 times over the conventional bulk g-C_(3)N_(4)).The strong interactive conjugatedπ-bond structure between g-C_(3)N_(4) and AC accelerated the migration of carriers and then prolonged the electron ***/AC composites exhibited excellent compatibility with different water substrates and were resilience to a wide range of p H changes and abundant competitive anions/*** experiments and electron microscopy characterization indicated that U(VI)was reduced by photogenerated electrons and deposited on the edge of CN/AC *** low-cost,high-performance carbon-based composite material proposed in this work is a potential candidate for the efficient treatment of radioactive wastewater.

关键词： Uranium removal photoreduction Graphitic carbon nitride Activated carbon Composite material

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