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Journal of Rare Earths 2023年第6期41卷 933-940,I0005页

作者： Ningyuan Wang Xiaoqiang Wang Yue Liu zhongbiao wu Department of Environmental Engineering Zhejiang UniversityHangzhou 310058China College of Biological Chemical Science and EngineeringJiaxing UniversityJiaxing 314001China

Traditional vanadium-based selective catalytic reduction(SCR)deNO_(x) catalyst can hardly adapt to the gas conditions(much high NO_(2)/NO_(x) ratio at lower temperature)of the start-up and low loading periods for a gas ***,a W-Ti-CeO_(x) catalyst with NO_(x) storage and reduction(NSR)function was developed in this work for gas turbine exhaust NO_(x) *** experimental results reveal that W-Ti-CeO_(x) catalyst exhibits high NO_(2) adsorption capacity at relatively low temperature while that is quite low for V-W/TiO_(2).The abundant surface Ce^(3+) species can be mainly responsible for its high adsorption ability owing to the reaction between NO_(2) and Ce^(3+) to form nitrate/nitrite species and ***,the adsorption capacity of W-Ti-CeO_(x) can easily regenerate at medium-high temperature and NH_(3)-SCR ***,W-Ti-CeO_(x) also shows good NH_(3)-SCR activity,which can fulfill the deNO_(x) process at high *** addition of W and Ti into ceria can enhance the surface acidity and redox ability,thereby increasing the SCR *** work proposes a novel storage-reduction strategy for NO_(x) elimination throughout the operation of gas turbines.

关键词： W-Ti-CeO_(x)catalyst Gas turbine NO_(x)storage and reduction NH_(3)-SCR Reaction process Rare earths

TiO_2-based building materials:Above and beyond traditional applications

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Chinese Science Bulletin 2009年第7期54卷 1137-1142页

作者： GUO Sen wu zhongbiao ZHAO WeiRong Department of Environmental Engineering Zhejiang University Hangzhou 310027 China

In the 1910s, TiO2 began to be used in building materials as pigments and opacifier due to its excellent optical property. Since the photocatalytic property of TiO2 was observed in 1972, its application field was expanded to air cleaning and sterilization. Thereafter, people added TiO2 into building materials to develop novel and facile building materials. These materials were widely used for air cleaning, sterilization, self-cleaning, anti-fogging, decoration, and building cooling. The combination of building and other functions can serve simultaneously. Although TiO2-based building materials have bright prospects, some aspects such as improving the stability and enhancing photoactive performance of the materials are of importance for future research.

关键词：建筑材料 TiO2 应用传统二氧化钛光学性能空气净化光催化性能

Characterization and precipitation mechanism of α-calcium sulfate hemihydrate growing out of FGD gypsum in salt solution

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Science China(Technological Sciences) 2009年第9期52卷 2688-2694页

作者： YANG LiuChun GUAN BaoHong wu zhongbiao Department of Environmental Engineering Zhejiang UniversityHangzhou 310027China School of Civil Engineering and Architecture East China Jiao Tong UniversityNanchang 330013China

Alpha-calcium sulfate hemihydrate (α-HH) has been prepared from flue gas desulfurization (FGD) gypsum with salt solution method under atmospheric pressure. X-ray diffraction (XRD),thermogra-vimetry and differential scanning calorimetry (TG-DSC),optical micrograph,X-ray photoelectron spec-troscopy (XPS),energy dispersive spectrometry (EDS),and scanning electron microscopy (SEM) have been employed to characterize the α-HH crystals,based on which the formation and growth mecha-nisms of the α-HH crystals have been discussed. The results show that FGD gypsum can be success-fully transformed into high purity α-HH in salt solution under mild conditions,and that a dissolu-tion-recrystallization route is most probably adopted by this transition. The growth of α-HH crystals in salt solution demonstrates a preferred direction along [001] and results in a bundle-of-sheets or bun-dle-of-raphide texture. The characteristics revealed in this study can help to understand and control the growth of the α-HH crystal from solution.

关键词： FGD gypsum calcium sulfate hemihydrate dissolution-recrystallization salt solution method

Tailoring the simultaneous abatement of methanol and NO_(x) on Sb-Ce-Zr catalysts via copper modification

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Frontiers of Environmental Science & Engineering 2022年第10期16卷 65-75页

作者： Xiaoqiang Wang Yanye Zhu Yue Liu Xiaole Weng zhongbiao wu Department of Environmental Engineering Zhejiang UniversityHangzhou 310058China College of Biological Chemical Science and EngineeringJiaxing UniversityJiaxing 314001China

Simultaneously removal of NO_(x)and VOCs over NH3-SCR catalysts have attracted lots of attention ***,the presence of VOCs would have negative effect on deNOx efficiency especially at low *** this study,copper modification onto Sb_(0.5)CeZr_(2)O_(x)(SCZ)catalyst were performed to enhance the catalytic performance for simultaneous control of NNO_(x)and *** was obtained that copper addition could improve the low-temperature activity of both NOx conversion and methanol oxidation,where the optimal catalyst(Cu_(0.05)SCZ)exhibited a deNOx activity of 96%and a mineralization rate of 97%at 250℃,which are around 10%higher than that of Cu free *** characterization results showed that copper addition could obviously enhance the redox capacity of the *** such,the inhibition effect of methanol incomplete oxidation on NO adsorption and NH3 activation were then lessened and the conversion of surface formamide species were also accelerated,resulting in the rising of NOx conversion at low ***,excessive copper addition would damage the Sb-Ce-Zr oxides solid solution structure owing to Cu-Ce strong interactions,decreasing the surface area and ***,due to easier over-oxidation of NH3 with more Cu addition,the temperature window for NOx conversion would become quite *** findings could provide useful guidelines for the synergistic removal of VOCs over SCR catalyst in real application.

关键词： Copper modification Sb-CeZr_(2)O_(x)catalyst NO_(x) Methanol Simultaneous removal

Unveiling the secondary pollution in the catalytic elimination of chlorinated organics: The formation of dioxins

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Chinese Chemical Letters 2020年第6期31卷 1410-1414页

作者： Jiajia Liu Xiaoxia Dai zhongbiao wu Xiaole Weng Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang Universityand Zhejiang Provincial Engineering Research Center of Industrial Boiler&Furnace Flue Gas Pollution ControlHangzhou 310058China

Since the discovery of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)in the process of municipal solid waste incineration(MSWI),a large number of researches have been conducted to reveal their formation mechanisms and emission *** one of national priority control pollutants,chlorinated organics are inclined to transfer into PCDD/Fs in the heterogeneously catalyzed process,which has been considered to be one of great challenges in environmental ***,so far direct evidences to support such a conversion process are insufficient,and the reaction mechanisms are lack of *** study investigated the catalytic elimination of chlorobenzene(CBz)over a range of industrially applied active species including Pt,Ru,V,Ce and Mn oxides,and explored their reaction byproducts,chlorine adsorption/desorption behaviors and PCDD/F *** found that all of these species could generate the PCDD/Fs,amongst which,Mn species were the most active for PCDD/F *** 140 ng I-TEQg-1 PCDD/Fs were detected on the Mn-CNT surface after ageing at250℃for 30 *** using the dichloromethane(DCM)as a precursor,significant PCDD/Fs were still *** Ru and V species were shown to generate much less polychlorinated byproducts and PCDD/Fs,owning to their sufficiently high abilities in Cl desorption,which were through the semi-Deacon and Br(?)nsted H reactions,respectively.

关键词： VOCs oxidation Chlorinated organics Secondary pollution Dioxin Electrophilic chlorination Environmental catalysis

Influences of pH value in deposition-precipitation synthesis process on Pt-doped TiO_2 catalysts for photocatalytic oxidation of NO

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Journal of Environmental Sciences 2012年第8期24卷 1519-1524页

作者： Shuzhen Song Zhongyi Sheng Yue Liu Haiqiang Wang zhongbiao wu Department of Environmental Engineering Zhejiang UniversityHangzhou 310058China Guodian Science and Technology Research Institute Nanjing 210031China

This work has been undertaken to study the influences of pH value on the characteristics and activity of photocatalyst by deposition- precipitation method during its preparation process. A series of Pt-modified TiO2 were prepared by deposition-precipitation method at different pH values as well as wet impregnation method, and characterized by XRD, XPS, TEM, UV-Vis and photoluminescence （PL）. It was found that the catalysts had the highest photocatalytic activity for NO conversion when pH value was kept at around 7. And the sample prepared by deposition-precipitation method showed higher activity than that by impregnation method. This was mainly due to their high value in highly-dispersed platinum oxides （PtOx） content on the surface of the catalysts. The results from UV-Vis absorption showed that highest absorbance was obtained for Pt/TiO2 prepared at pH values of around 7. And PL spectra results indicated that the recombination rate of photogenerated electrons and holes of the samples prepared by deposition-precipitation method was lower than that prepared by impregnation method. And in the zeta potential study, the pH values for the isoelectric point of the preparing slurry of 0.05 wt.%Pt/TiO2 and 0.5 wt.%Pt/TiO2 were determined to be 6.5-8.5, which further confirmed the enrichment of PtOx dopants for the catalysts repapered when pH value was around 7.

关键词： pH value ZiO2 PtOx NO photocatalysis zeta potential

Simultaneous removal of NO and dichloromethane(CH_(2)Cl_(2)) over Nb-loaded cerium nanotubes catalyst

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Journal of Environmental Sciences 2022年第1期34卷 175-184页

作者： Weilong Ouyang Yi Zhou Xiaoqi Fei Yarong Bai Haiqiang Wang zhongbiao wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resources ScienceZhejiang UniversityHangzhou 310058China Zhejiang Provincial Engineering Research Center of Industrial Boiler and Furnace Flue Gas Pollution Control Hangzhou 310058China

Herein,a series of niobium oxide supported cerium nanotubes(Ce NTs)catalysts with different loading amount of Nb_(2)O_(5)(0–10 wt.%)were prepared and used for selective catalytic reduction of NOxwith NH_(3)(NH_(3)-SCR)in the presence of CH_(2)Cl_(2).Commercial V_(2)O_(5)-WO_(3)-TiO_(2) catalyst was also prepared for *** physcial properties and chemical properties of the Nb_(2)O_(5) loaded cerium nanotubes catalysts were investigated by X-ray diffractometer,Transmission electron microscope,Brunauer-Emmett-Teller specific surface area,H_(2)-temperature programmed reduction,NH_(3)-temperature programmed desorption and Xray photoelectron *** experiment results showed that the loading amount of Nb_(2)O_(5) had a significant effect on the catalytic performance of the catalysts.10 wt.%Nb-Ce NTs catalyst presented the best NH_(3)-SCR performance and degradation efficiency of CH_(2)Cl_(2) among the prepared catalysts,due to its superior redox capability,abundant surface oxygen species and acid sites,the interaction between Nb and Ce,higher ratio of Nb^(4+)/(Nb^(5+)+Nb^(4+))and Ce^(3+)/(Ce^(3+)+Ce^(4+)),as well as the special tubular structure of cerium *** study may provide a practical approach for the design and synthesis of SCR catalysts for the simultaneously removal NOxand chlorinated volatile organic compounds(CVOCs)emitted from the stationary industrial sources.

关键词： Cerium nanotubes Niobium oxide Selective catalytic reduction Nitrogen oxides CH_(2)Cl_(2) Simultaneous removal

Enhanced CO_2 adsorptive performance of PEI/SBA-15 adsorbent using phosphate ester based surfactants as additives

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Journal of Environmental Sciences 2015年第12期27卷 1-7页

作者： Dandan Cheng Yue Liu Haiqiang Wang Xiaole Weng zhongbiao wu Department of Environmental Engineering Zhejiang University Zhejiang Provincial Engineering Research Center of Industrial Boiler and Furnace Flue Gas Pollution Control

In this study,a series of polyetherimide/SBA-15： 2-D hexagonal P6 mm,Santa Barbara USA（PEI/SBA-15） adsorbents modified by phosphoric ester based surfactants（including tri（2-ethylhexyl）phosphate（TEP）,bis（2-ethylhexyl） phosphate（BEP） and trimethyl phosphonoacetate（TMPA））were prepared for CO2 *** results indicated that the addition of TEP and BEP had positive effects on CO2 adsorption capacity over PEI/*** particular,the CO2 adsorption amount could be improved by around 20% for 45PEI-5TEP/SBA-15 compared to the additive-free *** could be attributed to the decrease of CO2 diffusion resistance in the PEI bulk network due to the interactions between TEP and loaded PEI molecules,which was further confirmed by adsorption kinetics *** addition,it was also found that the cyclic performance of the TEP-modified adsorbent was better than the surfactant-free *** could be due to two main reasons,based on the results of in situ DRIFT and TG-DSC *** and more importantly,adsorbed CO2 species could be desorbed more rapidly over TEP-modified adsorbent during the thermal desorption ***,the enhanced thermal stability after TEP addition ensured lower degradation of amine groups during adsorption/desorption cycles.

关键词： CO2 adsorption Tri(2-ethylhexyl) phosphate PEI/SBA-15 adsorbent Dispersion Surfactant

Catalytic destruction of chlorobenzene over K-OMS-2: Inhibition of high toxic byproducts via phosphate modification

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Journal of Environmental Sciences 2023年第5期127卷 844-854页

作者： Yunpeng Long Jiajia Liu Meiling Chen Renna Li Xiaole Weng zhongbiao wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Zhejiang Provincial Engineering Research Center of Industrial Boiler and Furnace Flue Gas Pollution Control Zhejiang University-Hangzhou Global Scientific and Technological Innovation CenterHangzhou 311200China

In the process of catalytic destruction of chlorinated volatile organic compounds(CVOCs),the catalyst is prone to chlorine poisoning and produce polychlorinated byproducts with high toxicity and persistence,bringing great risk to atmospheric environment and human *** solve these problems,this work applied phosphate to modify K-OMS-2 *** physicochemical properties of catalysts were determined by using X-ray powder diffraction(XRD),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),hydrogen temperature programmed reduction(H_(2)-TPR),pyridine adsorption Fouriertransform infrared(Py-IR)and water temperature programmed desorption(H_(2)O-TPD),and chlorobenzene was selected as a model pollutant to explore the catalytic performance and byproduct inhibition function of *** results revealed that 1 wt.%phosphate modification yielded the best catalytic activity for chlorobenzene destruction,with the 90%conversion(T90)at approximately 247℃.The phosphating significantly decreased the types and yields of polychlorinated byproducts in *** phosphating,we observed significant hydroxyl groups on catalyst surface,and the active centerwas transformed into Mn(IV)-O…H,which promoted the formation of HCl,and enhanced the dechlorination ***,the enriched Lewis acid sites by phosphating profoundly enhanced the deep oxidation ability of the catalyst,which promoted a rapid oxidation of reaction intermediates,so as to reduce byproducts *** study provided an effective strategy for inhibiting the toxic byproducts for the catalytic destruction of chlorinated organics.

关键词： Catalytic destruction Chlorinated organics Phosphoric modification K-OMS-2 Secondary pollution

Long-term variation and evaluation of air quality across Hong Kong region

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Journal of Environmental Sciences 2023年第5期127卷 284-294页

作者： Yan Tan Shuwen Han Yi Chen zhongbiao wu Shun-cheng Lee School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266520China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Division of Environment and Sustainability The Hong Kong University of Science and TechnologyHong Kong SAR 999077China Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China

Study of Air Quality Objectives(AQOs)and long-term changes of air pollution plays a decisive role in formulating and refining pollution control *** this study,10-year variations of six major air pollutants were analyzed at seven monitoring sites in Hong Kong *** continuous decrease of annual averaged concentrations of NO_(2),SO_(2),CO,PM_(2.5)and PM_(10)and numbers of days with severe pollution conditions validated the efficiency of the series of air pollution control schemes implemented by the Hong Kong region ***,there is still a big gap to meet the ultimate targets described by the World Health ***,the concentration of O_(3)at roadside and urban stations increased by 135%±25%and 37%±18%from 2011 to 2020,respectively,meanwhile the highest 8 hr averaged O_(3)concentration was observed as 294μg/m^(3)at background station in 2020,which pointed out the increasing ozone pollution in Hong Kong *** was a great decrease in the annual times of air quality health index(AQHI)laying in“high”,“very high”and“serious”categories from 2011 to 2020 with the decrease rate of 89.70%,91.30%and 89.74%at roadside stations,and 79.03%,95.98%and 72.73%at urban stations,***,the number of days categorized as“high”or above at roadside station was twice more than that in the urban station during the past ten ***,more policies and attentions should be given to the roadside air quality and its adverse health effect to pedestrians on street.

关键词： Long-term variation Roadside Hong Kong region air quality Air Quality Objectives(AQO) Air quality health index(AQHI)