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| 1 | Preparation of cross-linked magnetic chitosan with quaternary ammonium and its application for Cr(Ⅵ) and P(Ⅴ) removal显示文摘Pollutants that exist in anionic species are issues of concern in water treatment.Compared to cationic pollutants,the removal of anionic pollutants by adsorption is more difficult because most adsorbents carry predominantly negative charges in neutral and alkaline environments.In this study,a cross-linked chitosan derivative with quaternary ammonium and magnetic properties(QM-chitosan)was prepared and employed to remove chromium(VI)and phosphorus(V)(Cr(VI)and P(V))from aqueous environments.The QM-chitosan was characterized by Fourier transform infrared spectrometry(FT-IR),thermogravimetric analysis(TGA),energy dispersive X-ray(SEM-EDX)and zeta potential.Batch experiments show that QM-chitosan can effectively remove Cr(VI)and P(V),and the main mechanism was believed to be electrostatic interaction.A pseudosecond-order model was fitted to describe the kinetic processes of Cr(VI)and P(V)removal.The adsorption isotherms of both Cr(VI)and P(V)on the QM-chitosan were well fitted by the Langmuir isotherm equation.The saturated adsorption capacity of P(V)(2.783 mmol/g)was found to be higher than that of Cr(VI)(2.323 mmol/g),resulting from the size of the H2PO-4ions being smaller than that of the HCr O-4ions.However,the theoretical calculation and experimental results showed that QM-chitosan had a stronger affinity for Cr(VI)than P(V).The adsorption–desorption of the QM-chitosan was evaluated,and high regeneration rates were demonstrated. | Wei Yao Pinhua Rao Irene M.C.Lo Wenqi Zhang Wenrui Zheng | 2014 | Journal of Environmental Sciences2014，26，12： | 9 |
| 2 | Long-term observations of tropospheric NO_2, SO_2 and HCHO by MAX-DOAS in Yangtze River Delta area, China显示文摘Yangtze River Delta(YRD) area is one of the important economic zones in China. However,this area faces increasing environmental problems. In this study, we use ground-based multi-axis differential optical absorption spectroscopy(MAX-DOAS) network in Eastern China to retrieve variations of NO_2, SO_2, and formaldehyde(HCHO) in the YRD area. Three cities of YRD(Hefei, Nanjing, and Shanghai) were selected for long-term observations. This paper presents technical performance and characteristics of instruments, their distribution in YRD, and results of vertical column densities(VCDs) and profiles of NO_2, SO_2, and HCHO.Average diurnal variations of tropospheric NO_2 and SO_2 in different seasons over the three stations yielded minimum values at noon or in the early afternoon, whereas tropospheric HCHO reached the maximum during midday hours. Slight reduction of the pollutants in weekends occurred in all the three sites. In general trace gas concentrations gradually reduced from Shanghai to Hefei. Tropospheric VCDs of NO_2, SO_2, and HCHO were compared with those from Ozone Monitoring Instrument(OMI) satellite observations, resulting in R^2 of 0.606, 0.5432, and 0.5566, respectively. According to analysis of regional transports of pollutants, pollution process happened in YRD under the north wind with the pollution dissipating in the southeast wind. The feature is significant in exploring transport of tropospheric trace gas pollution in YRD, and provides basis for satellite and model validation. | Xin Tian Pinhua Xie Jin Xu Ang Li Yang Wang Min Qin Zhaokun Hu | 2018 | Journal of Environmental Sciences2018，30，9： | 7 |
| 3 | Variation of temporal and spatial patterns of NO_2 in Beijing using OMI and mobile DOAS显示文摘Control policies such as 'odd-and-even license plate rule' were implemented by the Chinese government to restrict traffic and suspend factory production in Beijing and neighboring cities during the Asia-Pacific Economic Cooperation summit. We use ozone monitoring instrument(OMI), mobile differential optical absorption spectroscopy(DOAS), and multi-axis differential optical absorption spectroscopy(MAX-DOAS) to measure the variation of the spatial and temporal patterns of NO2 column densities from October 24, 2014 to November 22, 2014. It is found that the NO2 column densities during the episode of control policies are significantly lower than those during other periods, and the emission flux of NO2 calculated by mobile DOAS is also lower than the results from other periods. Some daily low NO2 column densities occur with the northwest wind direction. We then compare the relationship between OMI and mobile DOAS NO2 column density observations, and the results of mobile DOAS are approximately 2.7 times larger than the OMI values. The largest discrepancy occurs in the northern part of Beijing city. In other parts, the two instruments have a better correlation coefficient(R2) of 0.61. The low NO2 column densities that occur during the episode of control policies are affected by the control policies as well as meteorological conditions. | Ang Li Jie Zhang Pinhua Xie Zhaokun Hu Jin Xu Fusheng Mou Fengcheng Wu Jianguo Liu Wenqing Liu | 2015 | Science China Chemistry2015，58，9： | 5 |
| 4 | Immobilized nickel(Ⅱ) on organic-inorganic hybrid materials: The effective and reusable catalysts for Biginelli reaction显示文摘The immobilized nickel(II) on the organic-inorganic hybrid material was prepared and used as an effective catalyst for the Biginelli reaction.In the presence of the immobilized nickel catalyst,aromatic aldehydes reacted with ethyl acetoacetate and urea (or thiourea) smoothly to generate the corresponding Biginelli products in good to excellent yields without using any additive.The work-up procedure is very simple and practical.Furthermore,the silica-supported nickel(II) could be recovered and recycled for six consecutive trials without significant loss of its catalytic activity. | ZHANG LiYuan WANG ChuanHu ZHOU Li LI PinHua ZHANG XiuLi WANG Lei | 2011 | Science China Chemistry2011，54，1： | 3 |
| 5 | Removal of agricul-tural non-point source pollutants by ditch wetlands of the Maixi River,Guizhou Province,China显示文摘 | Lin Tao Zhang Bangxi Xia Pinhua | | 0，，： | 1 |
| 6 | Reduction of nitroarones to aromatic amines with nanosized activated metallic iron powder in water显示文摘 | Pinhua Li Zangtao Wu | 2003 | Synthesis2003，13，： | 1 |
| 7 | Effects of humic acid on arsenic(V) removal by zero-valent iron from groundwater with special references to corrosion products analyses显示文摘 | Pinhua Rao Mark S.H. Mak Tongzhou Liu Keith C.K. Lai Irene M.C. Lo | 2009 | Chemosphere2009，，2： | 1 |
| 8 | A hydroxyl radical detection system using gas expansion and fast gating laser-induced fluorescence techniques显示文摘An OH radical measurement instrument based on Fluorescence Assay by Gas Expansion(FAGE)has been developed in our laboratory.Ambient air is introduced into a low-pressure fluorescence cell through a pinhole aperture and irradiated by a dye laser at a high repetition rate of 8.5 k Hz.The OH radical is both excited and detected at 308 nm using A-X(0,0)band.To satisfy the high efficiency needs of fluorescence collection and detection,a 4-lens optical system and a self-designed gated photomultiplier(PMT)is used,and gating is actualized by switching the voltage applied on the PMT dynodes.A micro channel photomultiplier(MCP)is also prepared for fluorescence detection.Then the weak signal is accumulated by a photon counter in a specific timing.The OH radical excitation spectrum range in the wavelength of 307.82–308.2 nm is detected and the excited line for OH detection is determined to be Q_1(2)line.The calibration of the FAGE system is researched by using simultaneous photolysis of H_2O and O_2.The minimum detection limit of the instrument using gated PMT is determined to be 9.4×10~5molecules/cm^3,and the sensitivity is 9.5×10^(-7)cps/(OH·cm^(-3)),with a signal-to-noise ratio of 2 and an integration time of 60 sec,while OH detection limit and the detection sensitivity using MCP is calculated to be 1.6×10~5molecules/cm^3and 2.3×10^(-6)cps/(OH·cm^(-3)).The laboratory OH radical measurement is carried out and results show that the proposed system can be used for atmospheric OH radical measurement. | Hao Chen Renzhi Hu Pinhua Xie Xingbiao Xing Liuyi Ling Zhiyan Li Fengyang Wang Yihui Wang Jianguo Liu Wenqing Liu | 2018 | Journal of Environmental Sciences2018，30，3： | 1 |
| 9 | Switch-linearity( CTA) Conversion Te- chnique Based on Optimal Wave-form Criterion显示文摘 | Zhou Qianzhi Zhu Pinhua | 1994 | IPEMC′ 941994，，2： | 1 |
| 10 | Boiler combustion optimization based on ANN and PSO-Powell algorithm显示文摘 | Dai Weibao Zou Pinhua | | 0，，02： | 1 |
| 11 | Community structure and assembly of denitrifying bacteria in epiphytic biofilms in a freshwater lake ecosystem显示文摘Denitrifying bacteria are a crucial component of aquatic ecosystem in nitrogen cycle.However,the denitrifying bacterial community dynamics and structure in epiphytic biofilms remain unexplored.The abundance of denitrification gene(nir)and structure of nirS-denitrifying bacterial community in the epiphytic biofilms collected in July and November of 2018 from a typical plateau lake(Caohai Wetland,Guizhou,China)were studied by Real-time Quantitative Polymerase Chain Reaction(qPCR)and highthroughput sequencing.Results show that the gene abundance of nirK was higher than that of nirS(P<0.05),and it was significantly different during the growth period(July)than the decline period(November).The denitrifying bacterial species was similar in the two months and shared 76.18%of OTUs.Proteobacteria(56.55%±22.15%)was the dominant phylum in all the samples.Epiphytic biofilms between growth period and decline period displayed significantly different microbial community structures due to differences in species abundance.Water temperature was the crucial factor that affected the denitrifying microbial community structure in our study.Environmental factors explain only partially the dynamic characteristics of denitrifying microbial communities,implying that the stochastic processes affected the construction of denitrifying microbial communities.As the null model analysis results show,dispersal limitation(stochastic)and undominated processes significantly influenced the assembly of denitrifying microbial communities.This study broadened our understanding of the denitrifying bacterial community structure and its function on epiphytic biofilms in freshwater ecosystems with new information provided. | Guoqing LI Dingbo YAN Pinhua XIA Haipeng CAO Tao LIN Yin YI | 2022 | Journal of Oceanology and Limnology2022，40，3： | 1 |
| 12 | Influences of humic acid, bicarbonate and calcium on Cr (Ⅵ) reductive removal by zero- valent iron显示文摘 | LIU Tongzhou RAO Pinhua LO I M C | 2009 | Science of the Total Environment2009，407，10： | 1 |
| 13 | Application of smog chambers in atmospheric process studies显示文摘Smog chamber experimental systems,which have been widely used in laboratory simulation for studying atmospheric processes,are comprehensively reviewed in this paper.The components,development history,main research topics and main achievements of smog chambers are introduced.Typical smog chambers in the world,including their volumes,wall materials,light sources and features,are summarized and compared.Key factors of smog chambers and their influences on the simulation of the atmospheric environment are discussed,including wall loss,wall emission and background pollutants.The features of next-generation smog chambers and their application prospect in future studies of the atmospheric environment are also outlined in this paper. | Biwu Chu Tianzeng Chen Yongchun Liu Qingxin Ma Yujing Mu Yonghong Wang Jinzhu Ma Peng Zhang Jun Liu Chunshan Liu Huaqiao Gui Renzhi Hu Bo Hu Xinming Wang Yuesi Wang Jianguo Liu Pinhua Xie Jianmin Chen Qian Liu Jingkun Jiang Junhua Li Kebin He Wenqing Liu Guibin Jiang Jiming Hao Hong He | 2022 | National Science Review2022，9，2： | 1 |
| 14 | Genetic algorithms of modeling reflectance function from rough surface显示文摘 | Wu Zhensen Xie Donghui Xie Pinhua | 2002 | Optics Transation2002，22，8： | 1 |
| 15 | Shifts of sediment bacterial community and respiration along a successional gradient in a typical karst plateau lake wetland(China)显示文摘Bacteria are important regulators of carbon cycling in lakes and are central to sediment ecosystem processes.However,the sediment microbial communities and their respiratory responses to the lake wetland succession are poorly understood.In this study,we collected sediment samples from four different succession points(the Potamogeton lucens zone,the Scirpus tabernaemontani zone,the Scirpus triqueter zone,and the Juncus effusus zone)in the Caohai Wetland of the Guizhou Plateau(China).The bacterial communities at these succession points were studied using a high-throughput sequencing approach.The sediment microbial respiration(SR)was measured using static chambers in the field and basal respiration(BR)was determined in the laboratory.The results show that the dominant bacterial taxa in the sediment was Proteobacteria(34.7%),Chloroflexi(17.8%),Bacteroidetes(7.3%),Acidobacteria(6.6%),and Cyanobacteria(6.1%).Principal coordinate analysis showed that the microbial community structure differs significantly at different sampling points along the successional gradient,indicating that the bacterial community structure is sensitive to the lake wetland succession.Different hydrological regimes and soil characteristics such as NH_(4)^(+)-N,Fe^(2+),Mn^(2+),and sediment organic carbon(SOC)content may be important factors responsible for the differences in the sediment microbial characteristics of the different successional stages in the Caohai wetland.Additionally,it was found that the SR increased significantly from the P.lucens zone to the J.effusus zone,but BR had the opposite response.The shifts in the bacterial community structure along the successional gradient may be the main reason for the observed differences in sediment respiration. | Pinhua XIA Jian ZHANG Jinbo LIU Lifei YU | 2021 | Journal of Oceanology and Limnology2021，39，3： | 1 |
| 16 | Photochemical and electrochemical strategies in C-F bond activation and functionalization显示文摘The activation and functionalization of C-F bonds under mild conditions can serve as an important tool for organic syntheses including the modification of pharmaceuticals and agrochemicals and the synthesis of value-added chemicals.However,owing to their high energy and low activity,C-F bonds are difficult to activate. | Zhanghong Wang Yu Sun Liu-Yu Shen Wen-Chao Yang Fei Meng Pinhua Li | 2022 | Organic Chemistry Frontiers2022，9，3： | 1 |
| 17 | Removal of co-present chromate and arsenate by zero-valent iron in groundwater with humic acid and bicarbonate 显示文摘 | Liu Tongzhou Rao Pinhua Mak M S H | 2009 | Water Research2009，43，9： | 1 |
| 18 | Influences of humic acid,bi- carbonate and calcium on Cr( VI ) reductive removal by zero-valent iron 显示文摘 | Liu Tongzhou Rao Pinhua Lo I M C | 2009 | Science of the Total Environment2009，407，10： | 1 |
| 19 | Key emergency response technologies for abrupt air pollution accidents in China显示文摘Abrupt air pollution accidents can endanger people’s health and destroy the local ecological environment.The appropriate emergency response can minimize the harmful effects of accidents and protect people’s lives and property.This paper provides an overview of the key emergency response technologies for abrupt air pollution accidents around the globe with emphasis on the major achievements that China has obtained in recent years.With decades of effort,China has made significant progress in emergency monitoring technologies and equipment,source estimation technologies,pollutant dispersion simulation technologies and others.Many effective domestic emergency monitoring instruments(e.g.,portable DOAS/FT-IR systems,portable FID/PID systems,portable GC-MS systems,scanning imaging remote sensing systems,and emergency monitoring vehicles)had been developed which can meet the demands for routine emergency response activities.A monitoring layout technique combining air dispersion simulation,fuzzy comprehensive evaluation,and a post-optimality analysis was proposed to identify the optimal monitoring layout scheme under the constraints of limited monitoring resources.Multiple source estimation technologies,including the forward method and the inversion method,have been established and evaluated under various scenarios.Multi-scale dynamic pollution dispersion simulation systems with high temporal and spatial resolution were further developed.A comprehensive emergency response platform integrating database support,source estimation,monitoring schemes,fast monitoring of pollutants,pollution predictions and risk assessment was developed based on the technical idea of'source identification-model simulation-environmental monitoring'dynamic interactive feedback.It is expected that the emergency response capability for abrupt air pollution accidents will gradually improve in China. | Jun Duan Shushuai Mao Pinhua Xie Jianlei Lang Ang Li Jingjing Tong Min Qin Jin Xu Zeya Shen | 2023 | Journal of Environmental Sciences2023，，1： | 1 |
| 20 | Influences of humic acid,bicarbonate and calcium on Cr(Ⅵ) reductive removal by zero-valent iron显示文摘 | Liu Tongzhou Rao Pinhua Lo I M C | 2009 | Science of the Total Environment2009，407，： | 1 |
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