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Pathway of the ozonation of 2,4,6-trichlorophenol in aqueous solution

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Frontiers of Environmental Science & Engineering 2007年第2期1卷 179-183页

作者： pi yunzheng wang jianlong Laboratory of Environmental Technology Institute of Nuclear and New Energy TechnologyTsinghua UniversityBeijing 100084China

The reaction mechanism and pathway of the ozonation of 2,4,6-trichlorophenol(2,4,6-TCP)in aqueous solution were *** removal efficiency and the variation of H_(2)O_(2),Cl^(−),formic acid,and oxalic acid were studied during the semi-batch ozonation experiments(con-tinuous for ozone gas supply,fixed volume of water sample).The results showed that when there was no scavenger,the removal efficiency of 0.1 mmol/L 2,4,6-TCP could reach 99%within 6 min by adding 24 mg/L *** reaction of molecular ozone with 2,4,6-TCP resulted in the formation of *** maximal concentration of H_(2)O_(2) detected during the ozonation could reach 22.5%of the original concentration of 2,4,*** reaction of ozone with H_(2)O_(2) resulted in the generation of a lot of OH·***,2,4,6-TCP was degraded to formic acid and oxalic acid by ozone and OH·radicals *** the inhibition of OH·radicals,ozone molecule firstly degraded 2,4,6-TCP to form chlorinated quinone,which was subsequently oxidized to formic acid and oxalic *** reaction pathways of the degradation of 2,4,6-TCP by ozone and O_(3)/OH·were proposed in this study.

关键词： 2,4,6-trichlorophenol ozone hydrogen perox-ide hydroxyl radicals reaction pathway

Boosting Oxygen Evolution Reaction Performance on NiFe‑Based Catalysts Through d‑Orbital Hybridization

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Nano-Micro Letters 2025年第1期17卷 281-292页

作者： Xing wang Wei pi Sheng Hu Haifeng Bao Na Yao Wei Luo State Key Laboratory of New Textile Materials and Advanced Processing Technology Key Laboratory of New Textile Materials and Applications of Hubei ProvinceSchool of Materials Science and EngineeringWuhan Textile UniversityWuhan 430200People’s Republic of China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072People’s Republic of China

Anion-exchange membrane water electrolyzers(AEMWEs)for green hydrogen production have received intensive attention due to their feasibility of using earth-abundant NiFe-based *** introducing a third metal into NiFe-based catalysts to construct asymmetrical M-NiFe units,the d-orbital and electronic structures can be adjusted,which is an important strategy to achieve sufficient oxygen evolution reaction(OER)performance in ***,the ternary NiFeM(M:La,Mo)catalysts featured with distinct M-NiFe units and varying d-orbitals are reported in this *** and theoretical calculation results reveal that the doping of La leads to optimized hybridization between d orbital in NiFeM and 2p in oxygen,resulting in enhanced adsorption strength of oxygen intermediates,and reduced rate-determining step energy barrier,which is responsible for the enhanced OER *** critically,the obtained NiFeLa catalyst only requires 1.58 V to reach 1 A cm^(−2) in an anion exchange membrane electrolyzer and demonstrates excellent long-term stability of up to 600 h.

关键词： NiFe-based catalysts d-orbital coupling Oxygen evolution reaction Anion exchange membrane electrolyzer

Cesium removal from radioactive wastewater by adsorption and membrane technology

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Frontiers of Environmental Science & Engineering 2024年第3期18卷 161-175页

作者： Shuting Zhuang jianlong wang School of Environment&Natural Resources Renmin University of ChinaBeijing 100872China Laboratory of Environmental Technology INETTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Radioactive Waste Treatment INETTsinghua UniversityBeijing 100084China

Radiocesium is frequently present in radioactive wastewater,while its removal is still a challenge due to its small hydrated radius,high diffusion coefficient,and similar chemical behavior to other alkali metal elements with high background *** review summarized and analyzed the recent advances in the removal of Cs+from aqueous solutions,with a particular focus on adsorption and membrane separation *** inorganic,organic,and biological adsorbents have undergone assessments to determine their efficacy in the removal of cesium ***,membrane-based separation techniques,including reverse osmosis,forward osmosis,and membrane distillation,have also shown promise in effectively separating cesium ions from radioactive ***,this review summarized the main approaches,including Kurion/SARRY system+desalination system and advanced liquid processing system,implemented after the Fukushima Daiichi nuclear power plant accident in Japan to remove radionuclides from contaminated *** technology and membrane separation technology play a vital role in treatment of contaminated water.

关键词： Cesium Adsorption Membrane separation Advanced liquid processing system Fukushima nuclear accident

Comparative study on electrochemical degradation of 4-chlorophenol by different Pd/C gas diffusion electrodes

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Science China Chemistry 2007年第5期50卷 692-699页

作者： wang Hui wang jianlong Laboratory of Environmental Technology INET Tsinghua University Beijing 100084 China Laboratory of Environmental Technology INET Tsinghua University Beijing 100084 China

Pd/C catalyst used for the Pd/C gas diffusion cathodes was prepared by hydrogen reduction method and formaldehyde reduction method, and characterized by X-ray diffraction (XRD), transmission elec- trode microcopy (TEM), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) tech- niques. The electrochemical degradation of 4-chlorophenol was investigated in the diaphragm elec- trolysis system, aerating firstly with hydrogen gas then with air, using three different kinds of gas dif- fusion cathode. The results indicated that the self-made Pd/C gas diffusion cathode can not only re- ductively dechlorinate 4-chlorophenols by aerating hydrogen gas, but also accelerate the two-electron reduction of O2 to hydrogen peroxide (H2O2) by aerating air. Therefore, the removal efficiency of 4-chlorophenol by using Pd/C gas diffusion cathode is better than that of the C/PTFE gas diffusion cathode (no catalyst). The catalytic activity of Pd/C catalyst prepared by hydrogen reduction method is higher than that prepared by formaldehyde reduction method. The stability of the Pd/C gas diffusion cathodes is good. Therefore, both the removal efficiency and the dechlorination degree of 4-chlorophenol reached about 100% after 60 min, and the removal efficiency of 4-chlorophenol in terms of chemical oxygen demand (COD) in the cathodic compartment reached 87.4% after 120 min.

关键词： electrochemical oxidation, gas diffusion cathode, Pd/C catalyst, chlorophenol

Radiolysis of pentachlorophenol (PCP) in aqueous solution by gamma radiation

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Journal of Environmental Sciences 2008年第10期20卷 1153-1157页

作者： XUE, Jun wang, jianlong Laboratory of Environmental Technology INET Tsinghua University Beijing 100084 China

Steady-state radiolysis experiments were performed to investigate the γ-irradiation treatment of pentachlorophenol (PCP) in aqueous solution. The e?ect of initial concentration on the PCP degradation was also investigated. The experimental results showed that γirradiation was able to degrade PCP in aqueous solution successfully, and the radiolytical degradation process of PCP could be described by the first-order kinetic model. When the initial concentration of PCP was 25 and 50 mg/L and the radiation dose ...

关键词： ionizing irradiation pentachlorophenol (PCP) kinetics dechlorination toxicity

The effect of substrate concentration on biohydrogen production by using kinetic models

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Science China Chemistry 2008年第11期51卷 1110-1117页

作者： wang jianlong WAN Wei Laboratory of Environmental Technology INETTsinghua UniversityBeijing 100084China

The effect of substrate concentration ranging from 0 to 300 g/L on fermentative hydrogen production by mixed cultures was investigated in batch tests using glucose as substrate. The experimental results showed that, at 35 and initial pH 7.0, during the fermentative hydrogen production, the hydrogen °C production potential and hydrogen production rate increased with increasing substrate concentration from 0 to 25 g/L. The maximal hydrogen production potential of 426.8 mL and maximal hydrogen production rate of 15.1 mL/h were obtained at the substrate concentration of 25 g/L. The maximal hydrogen yield and the maximal substrate degradation efficiency were respectively 384.3 mL/g glucose and 97.6%, at the substrate concentration of 2 g/L. The modified Logistic model could be used to describe the progress of cumulative hydrogen production in this study successfully. The Han-Levenspiel model could be used to describe the effect of substrate concentration on fermentative hydrogen production rate.

关键词： glucose biohydrogen production hydrogen production rate modified Logistic model Han-Levenspiel model

Removal of nitrate from groundwater by heterotrophic denitrification using the solid carbon source

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Science China Chemistry 2009年第2期52卷 236-240页

作者： wang XuMing wang jianlong Laboratory of Environmental Technology INETTsinghua UniversityBeijing 100084China College of Plant Science Jilin UniversityChangchun 130062China

Removal of nitrate from groundwater was investigated using biodegradable meal box (BMB) and poly(?-caprolactone) (PCL) as carbon source and biofilm carrier. The experimental results show that nitrate in groundwater can be effectively removed using BMB and PCL as carbon source. Denitrification rates supported by BMB and PCL were 52.80 and 42.77 mg (NO3-N)/(m2·h), respectively, at 30°C and pH 7.5. The pH value of effluent ranged from 7 to 8, and NO2-N concentration was less than 0.1 mg/L. Compared with BMB, PCL could decrease nitrite accumulation; however, more significant influence of temperature on denitrification was observed for PCL as carbon source. Temperature constants for BMB and PCL were 0.045 and 0.068, respectively, at 10–30°C. Based on denitrification efficiency and cost, BMB is more suitable as a carbon source for denitrification of groundwater than PCL.

关键词： groundwater nitrate denitrification solid carbon source poly(ε-caprolactone)

Radiation induced decomposition of a refractory cefathiamidine intermediate

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Journal of Environmental Sciences 2014年第12期26卷 2406-2411页

作者： Qiburi Bao Lujun Chen jianlong wang School of Environment Tsinghua University Zhejiang Provincial Key Laboratory of Water Science and Technology Institute of Nuclear and New Energy Technology Tsinghua University

Diisopropylthiourea（DPT）, an intermediate of a widely used cephalosporin, has been found to be one of the most refractory components in cephalosporin synthesis *** compound cannot be completely removed by conventional biological processes due to its antimicrobial property. Ionizing radiation has been applied in the decomposition of refractory pollutants in recent years and has proved effective. Therefore, the decomposition of DPT by γ-irradiation was studied. The compound was irradiated at the dose of 150–2000 Gy before a change of concentration and UV absorption of the solutions was ***, the decomposition kinetics and radiation yield（G-value） of DPT was investigated. The results of radiation experiments on DPT-containing aqueous showed that the DPT can be effectively degraded by γ-radiation. DPT concentration decreased with increasing absorbed doses. G-values of radiolytic decomposition for DPT（20 mg/L） were 1.04 and 0.47 for absorbed doses of 150 and 2000 Gy, respectively. The initial concentration and p H of the solutions affected the degradation. As the concentration of substrate increased,the decomposition was reduced. The decrease of removal rate and radiation efficacy under alkaline condition suggested that lower p H values benefit the γ-induced degradation. UV absorption from 190 to 250 nm decreased after radiation while that from 250 to 300 nm increased, indicating the formation of by-products.

关键词： Decomposition Diisopropylthiourea Ionizing radiation Wastewater

Novel Application-oriented Transient Fuel Model of a Port Fuel Injection S. I. Engine

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Chinese Journal of Mechanical Engineering 2014年第2期27卷 348-357页

作者： wang Cunlei ZHANG jianlong YIN Chengliang National Engineering Laboratory for Automotive Electronic Control Technology Shanghai Jiao Tong University

Most researches on transient fuel control of port fuel injection S.I. engine are carried out from the perspective of advanced mathematical theories. When it comes to practical control, there exist many limitations although they are more intelligent. In order to overcome the fuel wetting effect of PFI engine, the application-oriented transient fuel control is studied by analyzing the key parameters which are closely related with the engine transient characteristics. Both validity and simplicity are taken into consideration. Based on the fuel wall-wetting theory and popular fuel compensation strategy, short-term transient fuel（STF） and long-term transient fuel（LTF）, as well as their individual decay approaches, are introduced. STF is to compensate the drastic fuel film loss caused by sudden throttle change, while the function of LTF is to compensate the fuel film loss by manifold air pressure（p） fluctuation. Each of them has their respective pros and cons. The engine fuel mass and air mass are also calculated for air-fuel ratio（AFR） according to ideal gas state equation and empirical equations. The vehicle acceleration test is designed for model validation. The engine experiences several mild and heavy accelerations corresponding to the gear change during vehicle acceleration. STF and LTF control are triggered reliably. The engine transient fuel control simulation adopts the same inputs as the test to ensure consistency. The logged test data are used to check the model output. The results show that the maximum fuel pulse width（FPW） error reaches 2 ms, and it only occurs under engine heavy acceleration condition. The average FPW error is 0.57 ms. The results of simulation and test are close overall, which indicates the accuracy of steady and transient fuel. The proposed research provides an efficient approach not only suitable for practical engineering application, but also for AFR prediction, fuel consumption calculation, and further studies on emission control.

关键词： engine strategy transient fuel model