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activated carbon fibers with manganese dioxide coating for flexible fiber supercapacitors with high capacitive performance

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Journal of Energy Chemistry 2019年第4期28卷 95-100页

作者： Huifang Li Jiachen Liang Huan Li Xiaoyu Zheng Ying Tao Zheng-Hong Huang Quan-Hong Yang Nanoyang Group School of Chemical Engineering and Technology Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Institute of Forensic Science Ministry of Public Security Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University

Fiber supercapacitor(FSC)is a promising power source for wearable/stretchable electronics and high capacitive performance of FSCs is highly desirable for practice flexible ***,we report a composite of manganese dioxide(Mn O_2)and activated carbon fibers(ACFs)with high MnO_2mass loading and microporous structure(abbreviated as Mn O_2@ACF),which is used as a fiber electrode to produce a FSC with a high capacitive performance and a good *** MnO_2@ACF composite electrode in FSCs delivers an ultrahigh specific capacitance of 410 mF/cm^2at 0.1 mA/cm^2,corresponding to a high energy density of 36μWh/cm^2and high power density of 726μW/cm^*** high capacitive performance and simple fabrication method indicates that the Mn O_2@ACF composite is a very promising electrode material for flexible fiber supercapacitors.

关键词： Fiber supercapacitors activated carbon fibers Mass loading Flexibility

CuO-modified activated carbon for the improvement of toluene removal in air

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Journal of Environmental Sciences 2020年第2期32卷 122-132页

作者： Bingman Lei Biyan Liu Huijun Zhang Libei Yan Hongmei Xie Guilin Zhou Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Technology and Business UniversityChongqing 400067China Chongqing Feearth Environmental Technology Co. Ltd.Chongqing 400067China Department of Materials Science and Engineering Chongqing Technology and Business UniversityChongqing 400067China

We used an impregnation method to prepare CuO/AC(activated carbon) composite materials of different CuO content and characterized them via scanning electron microscope(SEM), Brunauer–Emmett–Teller(BET), and Fourier transform infrared spectroscopy(FT-IR).The effect of CuO content on toluene adsorption/desorption was *** explored the reusability of AC and AC03(CuO modified AC with CuO loading 0.3 wt.%) adsorbents via toluene adsorption/desorption cycle *** used quasi-firstand quasi-second-order models, the Bangham model, and the Weber–Morris model to fit the toluene adsorption *** introduction of CuO species evidently improved the adsorption performance of activated carbon toward *** CuO content markedly affected the specific surface area, CuO dispersal, the numbers of oxygen-containing functional groups on the surface, and adsorption performance of the prepared composite *** CuO content was not favorable for the formation of active adsorption sites,while high content greatly reduced the specific surface area, and even covered active adsorption *** toluene adsorption performance varied in the order AC03 > AC02 >AC05 > AC08 > AC01(AC03, AC02, AC05, AC08 and AC01 are CuO modifying AC with CuO loading 0.3, 0.2, 0.5 0.8 and 0.1 wt.%, respectively).The breakthrough time and toluene adsorption capacity of the AC03 composite adsorbent were 94 min and 701.8 mg/g,respectively, and the recycling efficiency was 92.8% after thermal desorption at 200°*** adsorption process was best described by the Bangham model and adsorption could be divided into three stages.

关键词： CuO modified activated carbon composite adsorbents CuO species Toluene Adsorptive removal

Tuning of activated sludge in winter based on respirogram profiles under standard and site temperatures

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Journal of Environmental Sciences 2019年第5期31卷 330-338页

作者： Zhihua Li Zhenyu Hang Qian Zhang Shuangshuang Zhang Tianyu Zhang Hanqing Yu School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology Department of Mathematical Sciences Montana State University CAS Key Laboratory of Urban Pollutant Conversion Department of Chemistry University of Science & Technology of China

Respirograms of activated sludge OUR_ x^Tand OUR_x^(20)were measured under site(T) and standard(20°C) temperatures, respectively, and the predicted standard temperature respirogram OUR_( x,cal)^(20)was also calculated using the Arrhenius equation. These respirogram profiles reveal more information than effluent quality. A decrease of OUR_ x ^(20)is a critical alarm signal for the loss of pollutant removal capacity, and a sudden increase of the predicted value OUR_( x,cal)^(20)is an alarm signal for the unrecoverable deterioration of biomass. The sign of OUR_x^(20)–OUR_(x,cal)^(20)can be used for selection of tuning strategies. For example, a negative value of OUR_x^(20)–OUR_( x,cal)^(20)indicates that doubling biomass is difficult,thus strategies such as extending the reaction time with limited available biomass is preferred. The findings in this study elucidated the respiration profile of activated sludge under changes of temperature and can be effectively used for the stable operation of Wastewater Treatment Plants under cold temperatures and seasonal variations.

关键词： activated sludge Cold temperature shocking Oxygen uptake rate(OUR) Respirogram Seasonal variations

Effect of biological activated carbon filter depth and backwashing process on transformation of biofilm community

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Frontiers of Environmental Science & Engineering 2019年第1期13卷 159-169页

作者： Wanqi Qi Weiying Li Junpeng Zhang Xuan Wu Jie Zhang Wei Zhang College of Environmental Science and Engineering Tongji University Shanghai 200092 China State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China Chengdu Chuanli Intelligence Fluid Equipment Co. Ltd. Chengdu 611530 China

The biological activated carbon (BAC) is a popular advanced water treatment to the provision of safe water supply. A bench-scale device was designed to gain a better insight into microbial diversity and community structure of BAC biofilm by using high-throughput sequencing method. Both samples of BAC biofilm (the first, third and fifth month) and water (inlet water and outlet water of carbon filter, outlet water of backwashing) were analyzed to evaluate the impact of carbon filter depth, running time and backwash process. The results showed that the microbial diversity of biofilm decreased generally with the increase of carbon filter depth and biofilm reached a steady-state at the top layer of BAC after three months' running. Proteobacteria (71.02%-95.61%) was found to be dominant bacteria both in biofilms and water samples. As one of opportunistic pathogen, the Pseudomonas aeruginosa in the outlet water of device (1.20%) was about eight times higher than that in the inlet water of device (0.16%) at the genus level after five-month operation. To maintain the safety of drinking water, the backwash used in this test could significantly remove Sphingobacteria (from 8.69% to 5.09%, p < 0.05) of carbon biofilm. After backwashing, the operational taxonomic units (OTUs) number and the Shannon index decreased significantly (p <0.05) at the bottom of carbon column and we found the Proteobacteria increased by about 10% in all biofilm samples from different filter depth. This study reveals the transformation of BAC biofilm with the impact of running time and backwashing.

关键词： Biological activated carbon Biofilm Community structure Carbon filter depth High-throughput sequencing

activated sludge process based on artificial neural network

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Journal of Harbin Institute of Technology(New Series) 2002年第4期9卷 383-386页

作者： ZHANG Wen-yi(张文艺) CAI Jian-an(蔡建安) School of Chemical & Environmental Engineering Anhui University of Technology Maanshan 243002 China School of Chemical & Environmental Engineering Anhui University of Technology Maanshan 243002 China

Considering the difficulty of creating water quality model for activated sludge system, a typical BP artificial neural network model has been established to simulate the operation of a waste water treatment facilities. The comparison of prediction results with the on-spot measurements shows the model, the model is accurate and this model can also be used to realize intelligentized on-line control of the wastewater processing process.

关键词： artificial neural network back-propagation activated sludge system model

Biogenic palladium prepared by activated sludge microbes for the hexavalent chromium catalytic reduction: Impact of relative biomass

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Frontiers of Environmental Science & Engineering 2020年第2期14卷 151-159页

作者： Luman Zhou Chengyang Wu Yuwei Xie Siqing Xia State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Palladium,a kind of platinum group metal,owns catalytic capacity for a variety of *** this study,Pd nanoparticles(PdNPs)were generated through enzymatic recovery by microbes of activated sludge at various biomass/Pd,and further used for the Cr(VI)*** results show that biomass had a strong adsorption capacity for Pd(II),which was 17.25 mg Pd/g *** XRD and TEM-EDX results confirmed the existence of PdNPs associated with microbes(bio-Pd).The increase of biomass had little effect on the reduction rate of Pd(II),but it could cause decreasing particle size and shifting location of Pd(0)with the better dispersion degree on the cell *** the Cr(VI)reduction experiments,Cr(VI)was first adsorbed on bio-Pd with hydrogen and then reduced using active hydrogen as electron *** improved the catalytic activity of *** the biomass/Pd(w/w)ratio increased to six or higher,Cr(VI)reduction achieved maximum rate that 50 mg/L of Cr(VI)could be rapidly reduced in one minute.

关键词： Palladium nanoparticles activated sludge Hexavalent chromium

Continuous flow removal of acid fuchsine by dielectric barrier discharge plasma water bed enhanced by activated carbon adsorption

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 340-349页

作者： Rusen Zhou Renwu Zhou Xianhui Zhang Kateryna Bazaka Kostya (Ken) Ostrikov School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQLD 4000Australia CSIRO-QUT Joint Sustainable Processes and Devices Laboratory CSIROLindfieldNSW 2070Australia Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Institute of Electromagnetics and AcousticsDepartment of Electronic ScienceSchool of Electronic Science and EngineeringXiamen UniversityXiamen 361005China

Continuous processes which allow for large amount of wastewater to be treated to meet drainage standards while reducing treatment time and energy consumption are urgently needed. In this study, a dielectric barrier discharge plasma water bed system was designed and then coupled with granular activated carbon (GAC) adsorption to rapidly remove acid fuchsine (AF) with high efficiency. Effects of feeding gases, treatment time and initial concentration of AF on removal efficiency were investigated. Results showed that compared to the N2 and air plasmas treatments, O2 plasma processing was most effective for AF degradation due to the strong oxidation ability of generated activated species, especially the OH radicals. The addition of GAC significantly enhanced the removal efficiency of AF in aqueous solution and shorten the required time by 50%. The effect was attributed to the ability of porous carbon to trap and concentrate the dye, increasing the time dye molecules were exposed to the plasma discharge zone, and to enhance the production of OH radicals on/in GAC to boost the degradation of dyes by plasma as well as in situ regenerate the exhausted GAC. The study offers a new opportunity for continuous effective remediation of wastewater contaminated with organic dyes using plasma technologies.

关键词： continuous removal dye-containing wastewater dielectric barrier discharge plasma water bed activated carbon adsorption

Review of post-combustion carbon dioxide capture technologies using activated carbon

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Journal of Environmental Sciences 2019年第9期31卷 46-63页

作者： Alivia Mukherjee Jude A.Okolie Amira Abdelrasoul Catherine Niu Ajay K.Dalai Department of Chemical and Biological Engineering University of Saskatchewan Saskatoon 57 Campus Drive

Carbon dioxide(CO2) is the largest anthropogenic greenhouse gas(GHG) on the planet contributing to the global warming. Currently, there are three capture technologies of trapping CO2 from the flue gas and they are pre-combustion, post-combustion and oxy-fuel combustion. Among these, the post-combustion is widely popular as it can be retrofitted for a short to medium term without encountering any significant technology risks or *** carbon is widely used as a universal separation medium with series of advantages compared to the first generation capture processes based on amine-based scrubbing which are inherently energy intensive. The goal of this review is to elucidate the three CO2 capture technologies with a focus on the use of activated carbon(AC) as an adsorbent for post-combustion anthropogenic CO2 flue gas capture prior to emission to atmosphere. Furthermore, this coherent review summarizes the recent ongoing research on the preparation of activated carbon from various sources to provide a profound understanding on the current progress to highlight the challenges of the CO2 mitigation efforts along with the mathematical modeling of CO2 capture. AC is widely seen as a universal adsorbent due to its unique properties such as high surface area and porous texture. Other applications of AC in the removal of contaminants from flue gas, heavy metal and organic compounds, as a catalyst and catalyst support and in the electronics and electroplating industry are also discussed in this study.

关键词： Post-combustion Greenhouse gas Carbon dioxide capture activated carbon Adsorption

Dynamic membrane bioreactor performance enhancement by powdered activated carbon addition:Evaluation of sludge morphological,aggregative and microbial properties

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Journal of Environmental Sciences 2019年第1期31卷 73-83页

作者： Zhenzhen Yu Yisong Hu Mawuli Dzakpasu Xiaochang C.Wang Huu Hao Ngo Key Lab of Northwest Water Resource Environment and Ecology MOE Xi'an University of Architecture and Technology International Science & Technology Cooperation Center for Urban Alternative Water Resources Development Key Lab of Environmental Engineering Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney

The effects of powdered activated carbon(PAC) addition on sludge morphological, aggregative and microbial properties in a dynamic membrane bioreactor(DMBR) were investigated to explore the enhancement mechanism of pollutants removal and filtration performance. Sludge properties were analyzed through various analytical measurements. The results showed that the improved sludge aggregation ability and the evolution of microbial communities affected sludge morphology in PAC-DMBR, as evidenced by the formation of large, regularly shaped and strengthened sludge flocs. The modifications of sludge characteristics promoted the formation process and filtration flux of the dynamic membrane(DM) layer. Additionally, PAC addition did not exert very significant influence on the propagation of eukaryotes(protists and metazoans)and microbial metabolic activity. High-throughput pyrosequencing results indicated that adding PAC improved the bacterial diversity in activated sludge, as PAC addition brought about additional microenvironment in the form of biological PAC(BPAC), which promoted the enrichment of Acinetobacter(13.9%), Comamonas(2.9%), Flavobacterium(0.31%) and Pseudomonas(0.62%), all contributing to sludge flocs formation and several(such as Acinetobacter) capable of biodegrading relatively complex organics. Therefore, PAC addition could favorably modify sludge properties from various aspects and thus enhance the DMBR performance.

关键词： Dynamic membrane bioreactor Powdered activated carbon Sludge property Filtration performance Wastewater treatment Microbial community