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Chinese Chemical Letters 2022年第3期33卷 1279-1282页

作者： Xin Xu Ganggang Li Fenglian Zhang Guoxia Jiang Zhengping Hao research center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China national engineering Laboratory for VOCs pollution control Material&Technology Research Center for Environmental Material and Pollution Control TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China

H_(2)S selective catalytic oxidation technology is a prospective way for the treatment of low concentration acid gas with simple process operation and low investment. However, undesirable results such as large formation of SO_(2) and catalyst deactivation inevitably occur, due to the temperature rise of fixed reaction bed caused by the exothermic reaction. Catalyst with high activity in wide operating temperature window, especially in high temperature range, is urgently needed. In this paper, a series of copper-substituted hexaaluminate catalysts (LaCu_(x), x = 0, 0.5, 1, 1.5, 2, 2.5) were prepared and investigated for the H_(2)S selective oxidation reaction at high temperature conditions (300-550℃). The LaCu_(1) catalyst exhibited excellent catalytic performance and great stability, which was attributed to the best reductive properties and proper pore structure. Besides, two facile deep processing paths were proposed to eliminate the remaining H_(2)S and SO_(2) in the tail gas.

关键词： Low concentration acid gas H_(2)S selective oxidation High temperature Hexaaluminate catalyst

The role of doped-Mn on enhancing arsenic removal by MgAl-LDHs

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Journal of Environmental Sciences 2022年第10期34卷 125-134页

作者： Kaizhong Li Hui Liu Qingzhu Li Wenming Yao LanyanWu Shuimei Li Qingwei Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese national engineering research center for control&Treatment of Heavy Metal pollution Changsha 410083China Water pollution control Technology Key Lab of Hunan Province Changsha 410004China

To meet the challenges posed by global arsenic water contamination, the Mg Al Mn-LDHs with extraordinary efficiency of arsenate removal was developed. In order to clarify the enhancement effect of the doped-Mn on the arsenate removal performance of the LDHs, the cluster models of the Mg Al Mn-LDHs and Mg Al-LDHs were established and calculated by using density functional theory(DFT). The results shown that the doped-Mn can significantly change the electronic structure of the LDHs and improve its chemical activity. Compared with the Mg Al-LDHs that without the doped-Mn, the HOMO-LUMO gap was smaller after doping. In addition, the-OH and Al on the laminates were also activated to improve the adsorption property of the LDHs. Besides, the doped-Mn existed as a novel active site. On the other hand, the Mg Al Mn-LDHs with the doped-Mn, the increased of the binding energy, as well as the decreased of the ion exchange energy of interlayer Cl^(-), making the ability to arsenate removal had been considerably elevated than the Mg Al-LDHs. Furthermore, there is an obvious coordination covalent bond between arsenate and the laminates of the Mg Al MnLDHs that with the doped-Mn.

关键词： Mechanism Arsenate removal Mn LDHs DFT

An estimation of vehicle kilometer traveled and on-road emissions using the traffic volume and travel speed on road links in Incheon City

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Journal of Environmental Sciences 2017年第4期29卷 90-100页

作者： Sungwoon Jung Jounghwa Kim Jeongsoo Kim Dahee Hong Dongjoo Park Transportation pollution research center National Institute of Environmental Research center for Korea Transport Database The Korea Transport Institute Department of Transportation engineering University of Seoul

The objective of this study is to estimate the vehicle kilometer traveled（VKT） and on-road emissions using the traffic volume in urban. We estimated two VKT; one is based on registered vehicles and the other is based on traffic volumes. VKT for registered vehicles was 2.11 times greater than that of the applied traffic volumes because each VKT estimation method is different. Therefore, we had to define the inner VKT is moved VKT inner in urban to compare two values. Also, we focused on freight modes because these are discharged much air pollutant emissions. From analysis results, we found middle and large trucks registered in other regions traveled to target city in order to carry freight, target city has included many industrial and logistics areas. Freight is transferred through the harbors,large logistics centers, or via locations before being moved to the final destination. During this process, most freight is moved by middle and large trucks, and trailers rather than small trucks for freight import and export. Therefore, these trucks from other areas are inflow more than registered vehicles. Most emissions from diesel trucks had been overestimated in comparison to VKT from applied traffic volumes in target city. From these findings, VKT is essential based on traffic volume and travel speed on road links in order to estimate accurately the emissions of diesel trucks in target city. Our findings support the estimation of the effect of on-road emissions on urban air quality in Korea.

关键词： Vehicle kilometer traveled On-road emissions Traffic volume Travel speed Diesel trucks

Single-step synthesis of magnetic chitosan composites and application for chromate(Cr(Ⅵ))removal

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Journal of Central South University 2016年第2期23卷 317-323页

作者：杨卫春唐琼芝董舒宇柴立元王海鹰 School of Metallurgy and Environment Central South UniversityChangsha 410017China Chinese national engineering research center for control&Treatment of Heavy Metal pollution Changsha 410017China

Magnetic chitosan composites(Fe3O4@chitosan) were synthesized in one single-step, characterized and applied in Cr(VI) removal from water. With the increase of loading proportion of chitosan, Cr(Ⅵ) adsorption capacity of Fe3O4@chitosan composites increased from 10.771 to 21.040 mg/g. The optimum adsorption capacities of Cr(VI) on Fe3O4@chitosan-3 were found in a pH range of 3.0-5.0. Kinetic study results show that the adsorption process follows pseudo-second-order model, indicating that the rate-limiting step in the adsorption of Cr(Ⅵ) involves chemisorptions. Moreover, FT-IR spectra analysis confirms that the amine and hydroxyl groups of chitosan are predominantly responsible for binding. Results from this work demonstrate that the prepared Fe3O4@chitosan composites possess great potential in Cr(Ⅵ) removal from contaminated water.

关键词： Cr(VI) magnetic chitosan one single-step synthesis adsorption

Enhancing corn stalk-based anaerobic digestion with different types of zero-valent iron added during the acidification stage:Performance and mechanism

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Journal of Environmental Sciences 2024年第11期145卷 64-74页

作者： Xiang Liu Yue Liu Min Wang Qianzhen Deng Hao Yang College of Agricultural Science and engineering Hohai UniversityNanjing 210098China State Key Joint Laboratory of Environment Simulation and pollution control School of EnvironmentTsinghua UniversityBeijing 100084China national and Local Joint engineering research center of Ecological Treatment Technology for urban Water pollution Wenzhou UniversityWenzhou 325035China Anhui Provincial Key Laboratory of Environmental pollution control and Resource Reuse Anhui Jianzhu UniversityHefei 230009China

Anaerobic digestion has been defined as a competitive approach to facilitate the recycling of corn ***,few studies have focused on the role of direct interspecies electron transfer(DIET)pathway in the acidification stage under the addition of different particle sizes of zero-valent iron(ZVI).In this study,three types of ZVI,namely iron filings,iron powder and nanoscale iron,were investigated,respectively,to enhance its high-value *** in volatile fatty acids(VFAs)and methane(CH4)production associated with the underlyingmechanisms were emphatically *** indicated that the addition of ZVI could increase the concentration of VFAs,with the most outstanding performance observed with the use of nanoscale ***,the conversion of propionic acid to acetic acid was driven by adding ZVI with no between-group differences in acidizing ***,the substrate was more fully utilized when supplied with iron powder compared with other groups in methanogenic phase,thereby displaying the maximumCH4 yield with a value of 263.1 mL/(g total solids(TS)).However,adding nanoscale iron could signally shorten the digestion time(T80),saving 7 days in comparison to the group of iron powder.

关键词： Zero-valent iron Corn stalk Anaerobic digestion Volatile fatty acids Methane

Effect of transport agent boron triiodide on the synthesis and crystal quality of boron arsenide

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 662-670页

作者： Zhenxing Liu Fangjie Deng Yuan Zhou Yanjie Liang Cong Peng Bing Peng Feiping Zhao Zhihui Yang Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese national engineering research center for control&Treatment of Heavy Metal pollution Changsha 410083China

Cubic boron arsenide(BAs)has attracted great attention due to its high thermal conductivity,however,its controllable,stable,and ideal preparation remains ***,we investigated the effect of iodine-containing transport agents I_(2) and boron triiodide(BI_(3))on BAs synthesized and grown through chemical vapor *** show that similar to the commonly used I_(2),BI_(3) accelerates the synthesis and improves the mass fraction of BAs from ~12% to over 90% at 820℃ and 1.5 MPa,a value beyond the promoting effect of only increasing temperature and *** agents enhance the quality of BAs crystals by reducing the full width at half maximum by up to 10%-20%.I_(2) agglomerates the grown crystals with twin defects(~50 nm wide),and BI_(3) improves the crystal anisotropy and element uniformity of BAs crystals with narrow twins(~15 nm wide)and increases the stoichiometry ratio(~0.990)to almost *** to the boron interstitials from the excessive boron supply,the spacing of layers in {111} increases to 0.286 nm in the presence of I_(2).Owing to its coordinated effect,BI_(3) only slightly influences the layer spacing at 0.275 nm,which is close to the theoretical value of 0.276 *** the chemical vapor transport,the anisotropic crystals with flat surfaces exhibit single-crystal characteristics under the action of BI_(3).Different from that of I_(2),the coordinated effect of BI_(3) can promote the efficient preparation of high-quality BAs crystal seeds and facilitate the advanced application of BAs.

关键词： boron arsenide transport agent boron-arsenic reaction iodine boron triiodide

Impact of urbanization and Industrialization upon Surface Water Quality:A Pilot Study of Panzhihua Mining Town

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Journal of Earth Science 2011年第5期22卷 658-668页

作者：滕彦国杨洁左锐王金生 College of Water Sciences Beijing Normal University engineering research center of Groundwater pollution control and Remediation Ministry of Education

In order to investigate the impact of urbanization and industrialization on surface water quality, a pilot study of Panzhihua （攀枝花） mining town was carried out. The urbanization of Panzhihua region was dominated by industry development and population growth. The level of urbanization showed that it was 18.44% in 1965, and reached 45.99% in 1983. Then, it reached 53.71% in 2005, so the urbanization process was very rapid in Panzhihua region. In the process of industrialization, the level of industrialization was fluctuated at around 70% from 1965 to 2005, which was influenced by mining, extracting, and smelting production. In the processes of urbanization, population growth caused an increase in life pollution sources, and an amount of effluents bearing coliform, COD （chemical oxygen demand）, NH4^＋-N, and BOD5 （five-day biological oxygen demand） were released into Jinsha （金沙） River, which could cause decline in the surface water quality. While in the processes of industrialization （especially industrial scale expansion）, more effluent bearing heavy metals could cause degra- dation of surface water quality. Thus, the measures, such as adjusting industry structure, optimizing the cleaning technology, and controlling pollution sources, should be enhanced to alleviate the current state of water quality exacerbation.

关键词： water quality urbanization level industrialization level water pollution comprehensive index GDP.

Denitrification and microbial community in MBBR using A. donax as carbon source and biofilm carriers for reverse osmosis concentrate treatment

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Journal of Environmental Sciences 2019年第10期31卷 133-143页

作者： Li Li Guokai Yan Haiyan Wang Zhaosheng Chu Zewen Li Yu Ling Tong Wu State Key Laboratory of Environmental Criteria And Risk As sessment Chinese Research Academy of Environmental SciencesBeijing 100012China engineering center for Environmental pollution control Chinese Research Academy of Environmental SciencesBeijing 100012China national engineering Laboratory for Lake pollution control and Ecological Restoration Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory for Lake pollution control Chinese Research Academy of Environmental SciencesBeijing 100012China

In this study,raw Arundo donax(***)pieces were applied as carbon source and biofilm carriers for denitrification in a lab-scale moving bed biofilm reactor(MBBR)for the treatment of reverse osmosis concentrate gathered from local wastewater reuse *** stable phase(about 60 days),efficient denitrification performance was obtained with73.2%±19.5%NO3--N average removal and 8.10±3.45 g N/(m3·day)NO3--N average volumetric removal *** balance analysis showed that 4.84 g *** was required to remove 1 g *** real-time PCR analysis results showed that the copy numbers of 16S r-RNA,narG,nirS,nosZ and anammox gene of carrier biofilm and suspended activated sludge in the declination phase(BF2 and AS2)were lower than those of samples in the stable phase(BF1 and AS1),and relatively higher copy numbers of nirS and nirK genes with lower abundance of narG and nosZ genes were ***-throughput sequencing analysis was conducted for BF2 and AS2,and similar dominant phyla and classes with different abundance were *** class Gammaproteobacteria affiliated with the phylum Proteobacteria was the most dominant microbial community in both BF2(52.6%)and AS2(41.7%).The PICRUSt prediction results indicated that 33 predictive specific genes were related to denitrification process,and the relative abundance of 18 predictive specific genes in BF2 were higher than those in AS2.

关键词： Arundo donax carbon source Denitrification MBBR Reverse osmosis concentrate Nitrate removal Microbial community High-throughput sequencing

Promotional effect of Cu additive for the selective catalytic oxidation of n-butylamine over CeZrO_(x)catalyst

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Chinese Chemical Letters 2022年第6期33卷 3065-3072页

作者： Xin Xing Ting Zhao Jie Cheng Xiaoxiao Duan Wenpeng Li Ganggang Li Zhongshen Zhang Zhengping Hao national engineering Laboratory for VOCs pollution control Material&Technology Research Center for Environmental Material and Pollution Control TechnologyUniversity of Chinese Academy of SciencesBeijing 101408China College of Environmental Science and engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

The catalytic elimination of nitrogen-containing volatile organic compounds(NVOCs)still encounters bottlenecks in NO_(x)formation and low N_(2)***,a series of Cu-promoted Ce-Zr mixed oxide catalysts were synthesized using a simple precipitation approach,and n-butylamine was adopted as the probe pollutant to evaluate their catalytic *** Ce Cu_(10%)ZrO_(x)catalyst exhibited the best catalytic activity,with 100%n-butylamine conversion and 90%N_(2)selectivity at 250℃.Concurrently,this sample also displayed good water resistance.A detailed characterization of the catalyst was performed through a series of experimental studies and theoretical *** addition of Cu increased the redox property and promoted the production of oxygen vacancies,all of which were favorable for the greatest nbutylamine selective catalytic oxidation *** changes of oxygen vacancies over Ce Cu_(10%)ZrO_(x)in reaction process were studied by in situ Raman ***,in situ diffuse reflectance infrared Fourier transform spectra(DRIFTs)and theoretical calculations were employed to explore the reaction mechanism of n-butylamine selective *** high activity and selectivity of this catalyst confirm the practical feasibility of the selective oxidation of n-butylamine to CO_(2)and N_(2),and the exploration of the reaction mechanism provides new insights into the further design of catalysts.

关键词： N-Butylamine CeCu_(a)ZrO_(x)mixed oxide Selective oxidation Oxygen vacancies Reaction mechanism

Catalytic applications of amorphous alloys in wastewater treatment: A review on mechanisms, recent trends, challenges and future directions

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Chinese Chemical Letters 2024年第10期35卷 73-81页

作者： Yulong Liu Haoran Lu Tong Yang Peng Cheng Xu Han Wenyan Liang engineering research center for Water pollution Source control&Eco-remediation Beijing Key Lab for Source Control Technology of Water PollutionCollege of Environmental Science and EngineeringBejing Forestry UniversityBeijing 100083China

Amorphous alloys,with unique atomic structures and metastable nature,are treated as superior candi-dates for environmental wastewater remediation due to their superior catalytic *** the strong demand for environmental protection,the field of amorphous alloys in wastewater treatment has great development prospects,and numerous research results have been published in recent *** a promising catalyst,it was demonstrated that amorphous alloys could exhibit many excellent proper-ties in wastewater treatment,such as high catalytic efficiency,easily adjustable parameters and reliable *** paper aims to summarize recent research trends regarding amorphous alloys in the field of catalysis,focusing on the preparation methods,physical performance,catalytic mechanisms and environmental ***,this review also investigates the challenges encountered and fu-ture perspectives of amorphous alloys,offering new research opportunities to enlarge their applicability spectra.

关键词： Amorphous alloys Wastewater treatment Advanced oxidation processes Catalyst Catalytic mechanism