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Journal of Environmental Sciences 2012年第2期24卷 297-302页

作者： chengzhi hu huijuan Liu Jiuhui Qu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China.

A polyaluminum containing a high concentration of Al13 polymer and active chlorine（PACC） was successfully synthesized by a new electrochemical reactor using Ti/RuO2-TiO2 *** can potentially be used as a dual-function chemical reagent for water *** obtained results indicated that the formation of Al13 polymer and active chlorine,were the most active components in PACC responsible for coagulation and disinfection *** components were significantly influenced by electrolyte temperature,current density,and stirring *** was observed that high electrolyte temperature favored the formation of *** current density and stirring rate resulted in high current efficiency of chlorine evolution,thus favoring the generation of Al13 and active chlorine in *** the PACC（AlT = 0.5 mol/L,basicity = 2.3） was prepared at the optimum conditions by electrolysis process,the Al13 polymer and active chlorine in product reached above 70% of AlT and 4000 mg/L,*** the pilot scale experiment with raw polyaluminum chloride used as an electrolyte,PACC was successfully prepared and produced a high content of Al13 and active chlorine *** pilot scale experiment demonstrated a potential industrial approach of PACC preparation.

关键词： Al13 polymer coagulation pre-oxidation electrolysis water treatment

Membrane fouling reduction through electrochemically regulating flocs aggregation in an electro-coagulation membrane reactor

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Journal of Environmental Sciences 2019年第9期31卷 144-151页

作者： Kai Zhao Jingqiu Sun chengzhi hu Jiuhui Qu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China

Coupling coagulation and applied electric field is an efficient method to regulate cake layer porosity and hydrophilicity for alleviating ultrafiltration membrane(UF) fouling. However,the Al/Fe flocs aggregation behavior are induced from electric field and determine the cake layer structure, which has not been studied comparatively yet. Herein, the anti-fouling performance in an efficient electro-coagulation membrane reactor(ECMR, in which UF membrane modules are placed between electrodes) was investigated with Al/Fe anode and various electrochemical parameters from the viewpoint of regulating flocs *** the cake layers formed from Al and Fe flocs under an electric field were more porous and hydrophilic in comparison with that formed without electric fields, resulting in an enhanced water flux under higher electric field strength. Comparing with Fe flocs, Al flocs had a faster growth rate and larger size, facilitating membrane pore block resistant, which was more pronounced in a higher current density. Furthermore, the cake layer formed from Al flocs was more porous than that formed from Fe flocs. Therefore, the anti-fouling performance of ECMR with Al anode was superior to that of ECMR with Fe anode. When the electric field strength increased from 0 to 10 V/cm, the normalized specific flux was improved from 71.2% to 89.4% for ECMR(Al) and from 48.1% to 70.1% for ECMR(Fe) at 30 min.

关键词： Electrocoagulation Ultrafiltration Membrane fouling Electric field Cake layer

A hybrid fuel cell for water purification and simultaneously electricity generation

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Frontiers of Environmental Science & Engineering 2023年第1期17卷 121-132页

作者： Yujun Zhou Qinghua Ji chengzhi hu huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China

The development of highly efficient energy conversion technologies to extract energy from wastewater is urgently needed,especially in facing of increasing energy and environment ***,we successfully fabricated a novel hybrid fuel cell with BiOCl-NH_(4)PTA as *** polyoxometalate(NH_(4)PTA)act as the acceptor of photoelectrons and could retard the recombination of photogenerated electrons and holes,which lead to superior photocatalytic *** utilizing BiOCl-NH_(4)PTA as photocatalysts and Pt/C air-cathode,we successfully constructed an electron and mass transfer enhanced photocatalytic hybrid fuel cell with flow-through field(F-HFC).In this novel fuel cell,dyes and biomass could be directly degraded and stable power output could be *** 87%of dyes could be degraded in 30 min irradiation and nearly 100%removed within 90 *** current density could reach up to~267.1μA/cm^(2);with maximum power density(Pmax)of~16.2μW/cm^(2) with Rhodamine B as organic pollutant in *** power densities were 9.0μW/cm^(2),12.2μW/cm^(2),and 13.9μW/cm^(2) when using methyl orange(MO),glucose and starch as substrates,*** hybrid fuel cell with BiOCl-NH_(4)PTA composite fulfills the purpose of decontamination of aqueous organic pollutants and synchronous electricity ***,the novel design cell with separated photodegradation unit and the electricity generation unit could bring potential practical application in water purification and energy recovery from wastewater.

关键词： Flow-through field Hybrid fuel cell Polyoxometalates Water purification Electricity generation

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Demulsification with simultaneous water purification by coupling filtration and enhanced oil droplet coalescence at anode interface in an electrochemical reactor

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Journal of Environmental Sciences 2024年第12期146卷 118-126页

作者： Xi Li Gong Zhang chengzhi hu huachun Lan huijuan Liu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China University of Chinese Academy of Sciences Beijing 100049China

With the increasing demand of recycling disposal of industrial wastewater,oil-in-water(O/W)emulsion has been paid much attention in recent years owing to its high oil ***,due to the presence of surfactant and salt,the emulsion was usually stable with complex physicochemical interfacial properties leading to increased processing ***,a novel flow-through electrode-based demulsification reactor(FEDR)was well designed for the treatment of saline O/W *** contrast to 53.7%for electrical demul-sification only and 80.3%for filtration only,the COD removal efficiency increased to 92.8%under FEDR ***,the pore size of electrode and the applied voltage were two key factors that governed the FEDR demulsification *** observing the mor-phology of oil droplets deposited layer after different operation conditions and the behavior of oil droplets at the electrode surface under different voltage conditions,the mechanism was proposed that the oil droplets first accumulated on the surface of flow-through elec-trode by sieving effect,subsequently the gathered oil droplets could further coalesce with the promoting effect of the anode,leading to a high-performing *** study offers an attractive option of using flow-through electrode to accomplish the oil recovery with simultaneous water purification.

关键词： Flow-through electrode Enhanced oil droplet coalescence Demulsification Oil/water emulsion separation

Molecular dynamics simulation of effects of nanoparticles on frictional heating and tribological properties at various temperatures

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Friction 2020年第3期8卷 531-541页

作者： chengzhi hu Jizu LV Minli BAI Xiaoliang ZHANG Dawei TANG Laboratory of Ocean Energy Utilization of Ministry of Education School of Energy and Power EngineeringDalian University of TechnologyDalian 116024China

The temperature of a friction pair exerts considerable influence on the tribological behavior of a *** two cases,one with and the other without Cu(copper)nanoparticles,the temperature increase in friction pairs caused by frictional heating and its tribological properties at various temperatures are studied by using the molecular dynamics *** results show that temperature distribution and surface abrasion are significantly improved by the presence of Cu *** is one of the reasons for the improvements in tribological properties achieved in the presence of *** temperature and range of influence of frictional heating for the model without nanoparticles are significantly increased with the increase in the sliding velocity;however,in the model with nanoparticles,the temperature gradient is confined to the area near the Cu *** an increase in the temperature of the friction pair,the improvement in anti-wear properties associated with the presence of Cu nanoparticles becomes more significant.

关键词： nanoparticles molecular dynamics temperature tribological properties

Coagulation properties of an electrochemically prepared polyaluminum chloride containing active chlorine

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Chinese Science Bulletin 2006年第16期51卷 1955-1960页

作者： hu chengzhi LIU huijuan QU Jiuhui State Key Laboratory of Environmental Aquatic Chemistry. Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

With high content of the Al13 species and the active chloride, an electrochemically prepared polyaluminum chloride (E-PACl) presents integrated efficiency of coagulation and oxidation. The coagula- tion properties of E-PACl were systemically investi- gated through jar tests in the various water quality conditions. The active chlorine in E-PACl can signifi- cantly influence the coagulation behavior due to the active chlorine preoxidation, which can change the surface charge characteristic of organic matter (OM) in water. The active chlorine preoxidation could im- prove the E-PACl coagulation efficiency if the water possessed the characteristics of relatively low OM content (2 mg/L) and high hardness (278 mg CaCO3/L). In the water with medium content of OM (5 mg/L), dosage would be a crucial factor to decide whether the active chlorine in E-PACl aided coagula- tion process or not. Comparing with alkaline condition, active chlorine would show a more significant influ- ence on the coagulation process in acidic region.

关键词：絮凝预氧化消毒水处理电化学方法

Defect-enhanced photocatalytic removal of dimethylarsinic acid over mixed-phase mesoporous TiO2

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Journal of Environmental Sciences 2020年第5期32卷 35-42页

作者： Jingjing Dong chengzhi hu Weixiao Qi Xiaoqiang An huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Much attention has been paid to the pollutant dimethylarsenic acid(DMA),because of its high toxicity even at very low *** TiO2 photocatalytic oxidation(PCO)is one of the few effective methods for treating DMA-containing water,the efficient decomposition of DMA and simultaneous removal of toxic arsenic species remains a significant but challenging ***,defective mesoporous TiO2 with mixed-phase structure was synthesized and used as both photocatalyst and adsorbent for DMA *** to the reduced band-gap and enhanced separation of photogenerated charge carriers,the oxygen-deficient TiO2 nanostructures exhibited 4.2 times higher PCO efficiency than commercial TiO2(P25).More importantly,the high surface area of the mesoporous TiO2 provided sufficient active sites for in-situ adsorption and reaction,resulting in the efficient removal of as-formed As(V).Combining the experimental and characterization results,the different roles of reactive species during PCO reactions were *** the presence of hole(h+)as the dominant oxidation species,DMA was demethylated and transformed into ***,MMA was subsequently reduced to As(Ⅲ)by photo-generated *** radicals(O2·-)played a significant role in oxidizing As(Ⅲ)into As(Ⅴ),which was finally adsorptively removed by the mesoporous TiO2.

关键词： Mesoporous TiO2 Dimethylarsinic acid Adsorption Photocatalysis Oxygen vacancy

Characteristics and Influencing Factors of Microplastics in Snow in the Inner Mongolia Plateau, China

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Engineering 2024年第6期37卷 69-77页

作者： Hongwei Yu Junrong Shao huawei Jia Diga Gang Baiwen Ma chengzhi hu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Changjiang Survey PlanningDesign and Research Co.Ltd.Wuhan 430010China

Microplastics(MPs;<5 mm)have become one of the most prominent global environmental pollution *** can spread to high altitudes through atmospheric transport and can be deposited by rainfall or snowfall,potentially thre... 详细信息

Microplastics(MPs;human activity to a great ***-throughput sequencing results showed that the composition and abundance of microorganisms also differed in snow samples from areas with different MP pollution characteristics,indicating a considerable difference in microbial functional *** may have an interference effect on the individual growth and functional expression of microorganisms in *** addition,the results showed that functional living areas(e.g.,landfills and suburban areas)in cities play an important role in the properties of *** instance,the highest abundance of MPs was found in thermal power plants,whereas the abundance of polymers per sample was significantly lower in the suburban *** MP contaminants hidden in snow can alter microbial structure and function and are therefore a potential threat to ecosystem health.

关键词： human activities Snow Microplastics Microbial community Urban function Environmental effect

Pre-oxidation enhanced cyanobacteria removal in drinking water treatment: A review

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Journal of Environmental Sciences 2021年第12期33卷 160-168页

作者： Jing Qi Baiwen Ma Shiyu Miao Ruiping Liu chengzhi hu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Cyanobacterial bloom has many adverse effects on source water quality and drinking water production. The traditional water treatment process can hardly achieve satisfactory removal of algae cells. This review examines the impact of pre-oxidation on the removal of cyanobacteria by solid-liquid separation processes. It was reported that the introduction of chemical oxidants such as chlorine, potassium permanganate, and ozone in algae-laden water pretreatment could improve algae removal by the subsequent solid-liquid separation processes. However, over dosed oxidants can result in more serious water quality risks due to significant algae cell lysis and undesirable intracellular organic matter release. It was suggested that moderate pre-oxidation may enhance the removal of cyanobacteria without damaging algae cells. In this article, effects of moderate pretreatment on the solid-liquid separation processes(sedimentation, dissolved air flotation, and membrane filtration) are reviewed.

关键词： Cyanobacterial bloom Pre-oxidation Sedimentation Dissolved air flotation Membrane filtration

Ultrasonication as anaerobic digestion pretreatment to improve sewage sludge methane production:Performance and microbial characterization

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Journal of Environmental Sciences 2024年第12期146卷 15-27页

作者： Kai Zhao Ge Song Chaojie Lu Jiaqi Wang Ruiping Liu chengzhi hu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

A large amount of sludge is inevitably produced during sewage ***(US)as anaerobic digestion(AD)pretreatment was implemented on different sludges and its effects on batch and semi-continuous AD performance were *** was ef-fective in sludge SCOD increase,size decrease,and CH_(4)production in the subsequent AD,and these effects were enhanced with an elevated specific energy *** indicated by semi-continuous AD experiments,the mean daily CH_(4)production of US-pretreated A^(2)O-,A^(2)O-MBR-,and AO-AO-sludgewere 176.9,119.8,and 141.7 NmL/g-VSadded,whichwere 35.1%,32.1%and 78.2%higher than methane production of their respective raw *** US of A^(2)O-sludge achieved preferable US effects and CH_(4)production due to its high organic con-tent andweak sludge structure *** response to US-pretreated sludge,amore diverse microbial community was observed in *** US-AD system showed negative net energy;however,it exhibited other positive effects,e.g.,lower required sludge retention time and less residual total solids for *** is a feasible option prior to AD to improve anaer-obic bioconversion and CH_(4)yield although further studies are necessary to advance it in practice.

关键词： Ultrasonication Waste activated sludge Anaerobic digestion CH_(4)production Microbial community