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Remediation of 2,4-dichlorophenol-contaminated groundwater using nano-sized CaO_(2)in a two-dimensional scale tank

Frontiers of Environmental Science & Engineering 2021年第5期15卷 123-132页

作者： Tianyi Li chengwu zhang Jingyi zhang Song Yan Chuanyu Qin Key Laboratory of Groundwater Resources and Environment(Ministry of Education) Jilin UniversityChangchun130021China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin UniversityChangchun130021China National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology Jilin UniversityChangchun130021China

This study evaluates the applicability of nano-sized calcium peroxide(CaO_(2))as a source of H_(2)O_(2)to remediate 2,4-dichlorophenol(2,4-DCP)contaminated groundwater via the advanced oxidation process(AOP).First,the effect and mechanism of 2,4-DCP degradation by CaO_(2)at different Fe concentrations were studied(Fenton reaction).We found that at high Fe concentrations,2,4-DCP almost completely degrades via primarily the oxidation of·OH within 5 *** low Fe concentrations,the degradation rate of 2,4-DCP decreased *** main mechanism was the combined action of·OH and O_(2)^(·−).Without Fe,the 2,4-DCP degradation reached 13.6%in 213 h,primarily via the heterogeneous reaction on the surface of CaO_(2).Besides,2,4-DCP degradation was significantly affected by solution *** the solution pH was>10,the degradation was almost completely ***,we adopted a two-dimensional water tank experiment to study the remediation efficiency CaO_(2)on the water *** noticed that the degradation took place mainly in regions of pH<10(i.e.,CaO_(2)distribution area),both upstream and downstream of the *** 28 days of treatment,the average 2,4-DCP degradation level was≈36.5%.Given the inadequacy of the results,we recommend that groundwater remediation using nano CaO_(2):(1)a buffer solution should be added to retard the rapid increase in pH,and(2)the nano CaO_(2)should be injected copiously in batches to reduce CaO_(2)deposition.

关键词： Calcium peroxide 2,4-DCP Reaction zone Fenton reaction

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Oxidative degradation of phenol by sulfidated zero valent iron under aerobic conditions:The effect of oxalate and tripolyphosphate ligands

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Journal of Environmental Sciences 2021年第2期33卷 82-89页

作者： Xianglong Kong chengwu zhang Jingyi zhang Lishuang Xuan Chuanyu Qin Key Laboratory of Groundw ater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Prouindal Key Laboratory of Water Resources and Enuironment jinin UniversityChangchun 130021China National and Local Joint Engineering Laboratory for Petrochem ical Contaminated Site Control and Remediation Technology Jilin UniversityChangchun 130021China

After adding either organic or inorganic ligands,sulfidated nano-zero-valent iron(Sn ZVI)was used for aerobic degradation of phenol,and the effect of the ligand species on oxidation performance was *** found that Sn ZVI hardly degraded phenol in the absence of ligand *** initiated and promoted the degradation of pollutants by Sn *** data herein show that a characteristic inorganic ligand,tripolyphosphate(TPP),is more effective in enhancing oxidation than a characteristic organic ligand *** addition to the scavenging of reactive oxidants by the organic ligand,more ferrous ion(Fe(Ⅱ))dissolution from Sn ZVI in the TPP system is another cause for the superior enhancement by the inorganic *** the oxalate system,as the sulfur content of Sn ZVI increased,the oxidation efficiency increased because Fe S shell promoted the transfer of electrons to produce more reactive oxygen species(ROS).In TPP system,the effect of sulfur content on oxidation performance is more *** Sn ZVI with low sulfur content showed poor oxidation performance compared with that of n *** experiments proved that sulfidation might weaken the complexation of TPP with surface bound Fe,which would slow down the ionic Fe(II)dissolution ***,sulfidation has the dual effects of enhancing electron transfer and inhibiting the complexation of inorganic *** addition,the mechanisms of ROS generation in different ligand systems were investigated *** showed that the critical ROS in both the oxalate and TPP systems are hydroxyl radicals,and that they are produced via one-electron activation of O_(2).

关键词： Zero valent iron Sulfidation Tripolyphosphate Oxalate Oxygen activation

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Viscous Heating for Laminar Liquid Flow in Microtubes

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Journal of Thermal Science 2011年第3期20卷 268-275页

作者： Zhigang LIU Shiqiang LIANG chengwu zhang Ning GUAN Energy Research Institute of Shandong Academy of Sciences Jinan 250014 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China

Using de-ionized ultra-filtered water (DIUFW) as the working fluid, the effects of viscous dissipation in micro-tubes with inner diameters of 19.9μm and 44.2μm, respectively, have been studied by experiments, the theoretical analysis and the numerical simulation at laminar state. Based on thermal imaging technology of micro-area, the temperature rise resulted from the viscous dissipation in microtube is measured by employing IR camera with a specially magnifying lens at different Reynolds numbers. A 2-D model adapted to microtube is presented to simulate the viscous dissipation characteristic considering electric double layer effect (EDL). The investigation shows the calculating results are in rough agreement with the experimental data if removing the experimental uncertainties. Based on the experimental and the numerical simulation results, a viscous dissipation number which can describe the law of the viscous heating in microtube is summed up and it explains the abnormity of the flow resistance in microtubes.

关键词： viscous dissipation microtube IR camera numerical simulation electric double layer effect

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Degradation of organic contaminants through the activation of oxygen using zero valent copper coupled with sodium tripolyphosphate under neutral conditions

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Journal of Environmental Sciences 2020年第4期32卷 375-384页

作者： chengwu zhang Lishuang Xuan Jingyi zhang Fang Yuan Xianglong Kong Chuanyu Qin Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China Jilin Provincial Key Laboratory of Water Resources and Environment Jilin UniversityChangchun 130021China National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Technology Jilin UniversityChangchun 130021China

In this study,sodium tripolyphosphate(STPP)was used to promote the removal of organic pollutants in a zero-valent copper(ZVC)/O2 system under neutral conditions for the first time.20 mg/L p-nitrophenol(PNP)can be completely decomposed within 120 min in the ZVC/O2/STPP *** PNP degradation process followed pseudo-first-order kinetics and the degradation rate of PNP gradually increased upon the decreasing ZVC particle *** optimal pH of the reaction system was *** mechanism investigation showed that Cu+generated by ZVC corrosion was the main reducing agent for the activation of 02 to produce ROS.-OH was identified as the only ROS formed during the degradation of PNP and its production pathway was the double-electron activation of O2(O2→H2 O2→·OH).In this process,STPP did not only promote the release of Cu+through its complexation,but also promoted the production of OH by reducing the redox potential of Cu2+/Cu+.In addition,we could initiate and terminate the reaction by controlling the *** pH8.1,the reaction was *** was recycled to continuously promote the corrosion of ZVC and O2 activation as long as the pH was<*** study provided a new and efficient way for O2 activation and organic contaminants removal.

关键词： Sodium tripolyphosphate Zero valent copper corrosion Oxygen activation pH control

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In vitro Antibacterial Activity of Palmitoleic Acid Isolated from Filamentous Microalga Tribonema minus Against Fish Pathogen Streptococcus agalactiae

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Journal of Ocean University of China 2022年第6期21卷 1615-1621页

作者： WANG Feifei GUO Yuhao CAO Yan zhang chengwu School of Modern Industry for Selenium Science and Engineering Wuhan Polytechnic UniversityWuhan 430023China School of Food Science and Pharmaceutical Engineering Nanjing Normal UniversityNanjing 210023China Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering Ministry of EducationGuangzhou 510632China Department of Ecology and Research Center for Hydrobiology Jinan UniversityGuangzhou 510632China

Filamentous microalgae from genus Tribonema are promising sustainable sources of omega-7 palmitoleic acid,but their ability to accumulate this compound varies among species and depends on the initial nitrogen concentration(INC)*** this study,the palmitoleic acid accumulation capacities of five Tribonema species were examined under three different INCs to select the alga species with the highest *** showed that a high INC was associated with increased palmitoleic acid accumulation but led to decreased biomass concentration in all tested *** particular,*** grown at 18 mmol L^(−1)INC had the highest palmitoleic acid content(20.72%of dry weight)and productivity(90.88 mg L^(−1)d−1).The combination of alkali metal freezing precipitation(AMFP)and urea complexation successfully isolated and enriched palmitoleic acid from *** and obtained a purity of 80.11%and a yield of 7.39 g(100 g)^(−1) of algal *** compound was identified as(9Z)-hexadecenoic acid(C16:1ω-7).Antibacterial activity evaluation for the highly concentrated palmitoleic acid(10 mg mL^(−1))against Streptococcus agalactiae revealed the formation of a 12.10 mm-diameter inhibition zone and the minimum inhibitory concentration of 31.25μg mL^(−1),indicating that palmitoleic acid is an effective antibacterial *** study is the first to report that palmitoleic acid derived from *** can antagonize ***,which further broadens the potential application of Tribonema biomass in green aquaculture.

关键词： Tribonema palmitoleic acid enrichment Streptococcus agalactiae antibacterial activity

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Taxonomy and ultrastructure of five species of Tetraselmis (Prasinophyceae) isolated from China seas

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Acta Oceanologica Sinica 2002年第4期21卷 557-579页

作者： zhang chengwu Hu Hongjun The Key Laboratory of Molecular Medical Biotechnology College of Life SciencesNanjing Normal UniversityNanjing 210097China Wuhan Institute of Botany Chinese Academy of SciencesWuhan 430074China

Comparative ultrastructural investigations on twenty-three isolates of Tetraselmis from the South China Sea, East China Sea and Huanghai Sea, have revealed that these isolates belong to:(1)Tetraselmis chui Butcher; (2)T. cordiformis (H. J. Carter) Stein; (3)T. helgolandica Kylin; (4)T. suecica (Kylin) Butcher; (5)T. guangdongensis sp. nov. Except T. helgolandica, the others are new records in China. T. guangdongensis sp. nov. is a new species. Its external and anatomical features closely resemble those of T. impellucida McLachlan et Parke. As in that species the pyrenoid is penetrated from many directions by cytoplasmic channels delimited by a double membrane. The protoplast withdraws from the apical portion of the theca, that portion which overlaid the trough inverts and pops out in the form of a teat. But unlike that species a starch sheath is present; pyrenoid matrix is surrounded by thylakoids which intervenes between the matrix and the starch sheath surrounding pyrenoid; the theca is stratified.

关键词： Taxonomy ultrastructure Tetraselmis pyrenoid

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Co-Production of Lipids, Eicosapentaenoic Acid, Fucoxanthin, and Chrysolaminarin by Phaeodactylum tricornutum Cultured in a Flat-Plate Photobioreactor Under Varying Nitrogen Conditions

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Journal of Ocean University of China 2017年第5期16卷 916-924页

作者： GAO Baoyan CHEN Ailing zhang Wenyuan LI Aifen zhang chengwu Department of Ecology & Research Center for Hydrobiology Jinan University Guangzhou 510632 P. R. China

The marine diatom Phaeodactylum tricornutum is a polymorphological, ecologically significant, and well-studied model of unicellular microalga. This diatom can accumulate diverse important metabolites. Herein, we cultured P. tricornutum in an internally installed tie-piece flat-plate photobioreactor under 14.5 m mol L^(-1)(high nitrogen, HN) and 2.9 m mol L^(-1)(low nitrogen, LN) of KNO_3 and assessed its time-resolved changes in biochemical compositions. The results showed that HN was inductive to accumulate high biomass(4.1 g L^(-1)). However, the LN condition could accelerate lipid accumulation in P. tricornutum. The maximum total lipid(TL) content under LN was up to 42.5% of biomass on day 12. Finally, neutral lipids(NLs) were 63.8% and 75.7% of TLs under HN and LN, respectively. The content of EPA ranged from 2.3% to 1.5% of dry weight during the growth period under the two culture conditions. Peak volumetric lipid productivity of 128.4 mg L^(-1)d^(-1) was achieved in the HN group(on day 9). The highest volumetric productivity values of EPA, chrysolaminarin, and fucoxanthin were obtained in the exponential phase(on day 6) under HN, which were 9.6, 93.6, and 4.7 mg L^(-1)d^(-1), respectively. In conclusion, extractable amounts of lipids, EPA, fucoxanthin, and chrysolaminarin could be obtained from P. tricornutum by regulating the culture conditions.

关键词： accumulate lipids volumetric biomass piece installed exponential biochemical diverse assessed

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Effects of Temperature, Salinity, Light Intensity, and pH on the Eicosapentaenoic Acid Production of Pinguiococcus pyrenoidosus

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Journal of Ocean University of China 2012年第2期11卷 181-186页

作者： SANG Min WANG Ming LIU Jianhui zhang chengwu LI Aifen Institute of Hydrobiology Ji'nan UniversityGuangzhou 510632P.R.China Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering Ministry of EducationGuangzhou 510632P.R.China Department of Life Science Hengyang Normal UniversityHengyang 421008P.R.China

The effects of temperature, light intensity, salinity, and initial pH on the growth and fatty acid composition of Pinguiococcus pyrenoidosus 2078 were studied for eicosapentaenoic acid (EPA) production potential. The fatty acid composition was assayed by gas chromatography-mass spectrometry, which indicated that the main fatty acids were C14:0, C16:0 and EPA. The highest EPA percentage 20.83% of total fatty acids was obtained at 20℃ with the temperature being set at 20, 24, and 28℃. Under different salinities and light intensities, the highest percentages of total polyunsaturated fatty acids (PUFAs) and EPA were 17.82% and 31.37% of total fatty acids, respectively, which were achieved at salinity 30 and 100μmol photon m-2s-1 illumination. The highest percentages of total PUFAs and EPA were 38.75% and 23.13% of total fatty acids, respectively, which were reached at an initial pH of 6 with the test range being from 5.0 to 9.0.

关键词： Pinguiococcus pyrenoidosus temperature light intensity salinity pH EPA fatty acids

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Mitochondria targeting drugs for neurodegenerative diseases——Design, mechanism and application

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Acta Pharmaceutica Sinica B 2022年第6期12卷 2778-2789页

作者： Jiajia Xu Wei Du Yunhe Zhao Kahleong Lim Li Lu chengwu zhang Lin Li Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech University(NanjingTech)Nanjing 211816China Department of Anatomy Shanxi Medical UniversityTaiyuan 030001China Lee Kang Chian School of Medicine Nanyang Technological UniversitySingapore 308232Singapore School of Basic Medical Sciences Shanxi Medical UniversityTaiyuan 030001China The Institute of Flexible Electronics(IFE Future Technologies)Xiamen UniversityXiamen 361005China

Neurodegenerative diseases(NDDs) such as Alzheimer’s disease(AD) and Parkinson ’s disease(PD) are a heterogeneous group of disorders characterized by progressive degeneration of *** threaten the lives of millions of people worldwide and regretfully remain *** is well accepted that dysfunction of mitochondria underlies the pathogenesis of *** of mitochondria results in energy depletion,oxidative stress,calcium overloading,caspases activation,which dominates the neuronal death of ***,mitochondria are the preferred target for intervention of *** far various mitochondria-targeting drugs have been developed and delightfully some of them demonstrate promising outcome,though there are still some obstacles such as targeting specificity,delivery capacity hindering the drugs *** present review,we will elaborately address 1) the strategy to design mitochondria targeting drugs,2) the rescue mechanism of respective mitochondria targeting drugs,3) how to evaluate the therapeutic *** this review will provide comprehensive knowledge for understanding how to develop more effective drugs for the treatment of NDDs.

关键词： Neurodegenerative diseases Mitochondria Targeting drug Apoptosis Reactive oxygen species Adenosine triphosphate Mitochondrial membrane potential Evaluation

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Small-molecule diketopyrrolopyrrole-based therapeutic nanoparticles for photoacoustic imaging-guided photothermal therapy

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Nano Research 2017年第3期10卷 794-801页

作者： Yu Cai Weili Si Qianyun Tang Pingping Liang chengwu zhang Peng Chen Qizhang Wei Huang Xiaochen Dong ing 211816 China School of Chemical and Biomedical Engineering Nanyang Technological University 70 Nanyang Drive N 1.3-B3-08 Singapore ingTech) 30 South Puzhu Road Naniing 211816 China

Therapeutic nanoparticles （NPs） based on the donor-acceptor-donor structured small organic molecule diketopyrrolopyrrole （SDPP） were prepared using a simple reprecipitation approach. These near-infrared radiation-absorbing NPs have high photothermal conversion efficiency and are able to selectively target cancer tissues through the enhanced permeability and retention effect. Benefiting from these advantages, SDPP NPs can serve as an excellent therapeutic agent for highly efficient and noninvasive photoacoustic imaging-guided photothermal therapy. Experiments using mouse tumor models showed that the SDPP NPs exhibited exceptional tumor ablation ability under laser irradiation （660 nm, 1.0 *** 2）, even at a low dose （0.16 ***^-1）.

关键词： photothermal therapy photoacoustic imaging diketopyrrolopyrrole donor-acceptor-donor

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