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Review on cellulose paper-based electrodes for sustainable batteries with high energy densities

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Frontiers of Chemical Science and Engineering 2023年第8期17卷 1010-1027页

作者： Ying Zhang zhaohui wang College of Materials Science and Engineering Hunan UniversityChangsha 410004China

Powering the future,while maintaining strong socioeconomic growth and a cleaner environment,is going to be one of the biggest challenges faced by mankind ***,there is a transition from the use of fossil fuels to renewable energy ***,the main component of paper,represents a unique type of bio-based building blocks featuring exciting properties:low-cost,hierarchical fibrous structures,hydrophilicity,biocompatible,mechanical flexibility,and renewability,which make it perfect for use in paper-based sustainable energy storage *** review focuses on lithium-ion battery application of celluloses with cellulose at different scales,i.e.,cellulose microfibers,and nanocellulose,and highlights the new trends in the *** advances and approaches to construct high mass loading paper electrodes toward high energy density batteries are evaluated and the limitations of paper-based cathodes are *** will stimulate the use of natural resources and thereby the development of renewable electric energy systems based on sustainable technologies with low environmental impacts and carbon footprints.

关键词： cellulose paper electrodes Li-ion batteries high energy density

Experimental investigation on the movement mechanism of top coal in steeply inclined ultra-thick coal seams

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Acta Mechanica Sinica 2021年第4期37卷 631-648,I0003页

作者： Jiachen wang Fei Liu zhaohui wang School of Energy and Mining Engineering China University of Mining&TechnologyBeijing 100083China Coal Industry Engineering Research Center of Top-Coal Caving Mining Beijing 100083China

The pre-blasting zones have a significant influence on the coal broken and the recovery rate of the top coal caving *** paper explores the coal movement mechanism in the top coal with pre-blasting zones based on the geological parameters of Jiangcang No.1 mine in the western of *** steeply inclined ultra-thick coal seam was mined by using the sublevel top-coal caving mining *** geo-image process system(GIPS)software was used to track the mark points on the coal and *** support was used to record the load on the top of the support during the caving mining *** results show that the horizontal coal is moved to the shield window and the vertical coal is moved downward in the first level,while that in the second level shows consistency for the integrity of the *** vertical displacements of the corresponding points in the first level are lairger than that in the second ***,the load on the top of the support in the first level is smaller than that in the second *** indicated that the pre-blasting zones will give a more loosen top-coal and a small degree of difficulty in the top coal caving.

关键词： Sublevel Top coal caving Pre-blasting Physical modeling Movement mechanism

Distribution and contamination of metals and biogenic elements in sediments from Zhifu Bay of the Yellow Sea,China

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Journal of Environmental Sciences 2016年第3期28卷 6-15页

作者： zhaohui wang Xinxin Lu Ke Zhang College of Life Science and Technology Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education InstitutesJinan University

Metals and biogenic elements were analyzed from surface sediments of sixteen stations and a 32 cm core collected from Zhifu Bay in July *** concentrations of biogenic silica（BSi）reflected the high diatom productivity in the ***,total organic carbon（TOC）in Zhifu Bay was mainly from terrestrial *** metals were lower than the marine sediment quality *** on the vertical profiles of biogenic elements,there was a clear increase of TOC,total nitrogen（TN）,and total phosphate（TP）between1985 and *** concentrations decreased after the start of the operation of the sewage treatment plant in 1998;however TOC and BSi remained at high *** concentrations showed a general increase from the bottom to the top of the *** anthropogenic metals reached a maximum during 1996 and 2000,and decreased after the startup of the sewage plant;however,they have increased again *** results from correlation analysis and principal component analysis show that industrial pollution is the main source of Cd,Cr,Cu,Ni,Pb and Zn contamination in Zhifu Bay,and Yantai Port and ship transportation also contribute a lot to Cd,Cu,Hg,and Pb pollution.

关键词： Metals Biogenic elements Sediments Sediment criteria The Yellow Sea

Stability of roof structure and its control in steeply inclined coal seams

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International Journal of Mining Science and Technology 2017年第2期27卷 359-364页

作者： Li Xiaomeng wang zhaohui Zhang Jinwang College of Mining and Geomatics Engineering Hebei University of Engineering College of Resources and Safety Engineering China University of Mining and Technology

To improve the effectiveness of control of surrounding rock and the stability of supports on longwall topcoal caving faces in steeply inclined coal seams, the stability of the roof structure and hydraulic supports was studied with physical simulation and theoretical analysis. The results show that roof strata in the vicinity of the tail gate subside extensively with small cutting height, while roof subsidence near the main gate is relatively assuasive. With increase of the mining space, the caving angle of the roof strata above the main gate increases. The characteristics of the vertical and horizontal displacement of the roof strata demonstrate that caved blocks rotate around the lower hinged point of the roof structure, which may lead to sliding instability. Large dip angle of the coal seam makes sliding instability of the roof structure easier.A three-hinged arch can be easily formed above both the tail and main gates in steeply inclined coal seams. With the growth in the dip angle, subsidence of the arch foot formed above the main gate decreases significantly, which reduces the probability of the roof structure becoming unstable as a result of large deformation, while the potential of the roof structure's sliding instability above the tail gate increases dramatically.

关键词： Steeply inclined coal seam Inclined masonry structure Overlying strata Structure instability

Isolation, characterization and implications of the bacterial communities associated with established cultures of Chattonella marina(Raphidophyceae) and Skeletonema costatum(Bacillariophyceae)

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Acta Oceanologica Sinica 2019年第1期38卷 128-135页

作者： Jian wang zhaohui wang Jiangang Zhao College of Life Science and Technology Jinan University Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan University

Cultivable bacteria coexisting in the cultures of two microalgal species, Chattonella marina(Raphidophyceae)and Skeletonema costatum(diatom, Bacillariophyceae), which have been maintained in the laboratory for several years, were examined in this study. Forty-eight and thirty-four cultivable bacterial strains were isolated from different growth stages of C. marina and S. costatum cultures, respectively. A total of twelve unique bacterial phylotypes were isolated. These bacterial phylotypes belonged to Alphaproteobacteria, Gammaproteobacteria,Bacteroidetes, and Actinobacteria. Alphaproteobacteria predominated in phycospheres of both microalgae, and Rhodobacteraceae was the most common family. Bacterial phylotypes were more diversified in cultures of *** than in those of C. marina. Bacterial concentrations increased remarkably after the late stationary phase of C. marina, which might account for the decline in algal cells. One phylotype of S. costatum-associated bacteria had inhibitory effects on Chaetoceros curvisetus(Bacillariophyceae). However, most bacterial phylotypes from cultures of C. marina showed significant inhibition of the growth of C. curvisetus. The results suggested that bacteria associated with C. marina might have some ecological roles in its competition with diatoms.

关键词： phycosphere marine bacteria Chattonella marina Skeletonema costatum Chaetoceros curvisetus algal growth

Removal of Cypermethrin with Seaweed Gracilaria lemaneiformis

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Journal of Ocean University of China 2015年第5期14卷 858-864页

作者： wang zhaohui YUE Wenjie College of Life Science and Technology Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan University

Abstract The removal of cypermethrin with a red macroalga, Gracilaria lemaneiformis, was studied under laboratory conditions. Results showed that the residue contents with G. lemaneiformis were significantly lower than those corresponding groups without the algal thalli after 96 h treatment. The removal rates decreased with increasing concentrations, which were about 50% without G. lemaneiformis after 96h exposure, and increased to 89%, 73%, and 66% in flasks with G. lemaneiformis at the concentrations of 10, 100, and 1000 gg L-1, respectively. The amount of biosorption （absorption and adsorption） by G. lemaneiformis increased with the increasing concentration and exposure time. Adsorption was the main process for the removal by G. lemaneiformis, which accounted for 75%-97% of the total biosorption. However, biosorption only contributed 0.5%-19.3% to the total losses of cypermethrin, which was more efficient under the low concentration. Natural losses contributed the largest portion of losses, which was over 65% in all treatments during the experiment. The unknown pathway of removal, which might be the bio-decomposed by microorganisms attaching the algal thalli, also contributed a lot to the total removal. The results suggested that cultivation of G. lemaneiformis could significantly remove cypermethrin, especially at low concentrations, and large-scale cultivation of G. lemaneiformis has considerable potential of biorestoration of eutrophic and cypermethrin-poUuted coastal sea areas.

关键词： cypermethrin Gracilaria lemaneiformis removal biosorption marine environment

Response of Phytoneuston Community to Organic Nitrogen and Phosphorus Revealed by HPLC-Pigments Method

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Journal of Ocean University of China 2020年第4期19卷 853-864页

作者： wang zhaohui ZHAO Jianggang XIAO Lin College of Life Science and Technology Jinan UniversityGuangzhou 510632China

The sea surface microlayer(SML)is the thin boundary layer between the ocean and the *** community in the SML is known as phytoneuston and has a different community structure and biomass from the phytoplankton of the underlying bulk *** this study,water samples were collected from the SML of Daya Bay in southern China in September,October,and December of *** growth potential(AGP)tests were conducted by adding different forms of nitrogen(N),phosphorus(P)and silicate(Si).Phytoneuston grew well with both inorganic and organic nutrients,and showed comparable community structure after nutrient addition.A total of 16 pigments were analyzed in the SML samples collected from Daya Bay in this *** were dominated by the cyanobacteria-diagnostic pigment(zeaxanthin,Zea)in September and October,and by diatom-diagnostic pigment(fucoxanthin,Fuco)in *** concentrations and proportions of Fuco increased greatly after the nutrient addition,and the concentrations and proportions of Zea decreased ***,the diatom pigment index(DiatDP)increased after nutrient addition,and the prokaryotic pigment index(ProkDP)conversely *** results suggested that massive occurrences of Zea and cyanobacteria are important characteristics of phytoneuston structure in Daya Bay especially in warm seasons,and nutrient addition especially Si addition promoted the growth of diatoms.

关键词： phytoplankton sea surface microlayer pigment nutrient cyanobacteria Daya Bay

Unraveling the amplified chiroptical responses of rylene-bladed quintuple[6]helicenes

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Science China Chemistry 2023年第8期66卷 2400-2407页

作者： Yanan Wu Yujian Liu Wei Jiang zhaohui wang Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing100084China

Unraveling the key structural features to maximize the chiroptical properties is of significance for developing high-performance chiral *** we present our first attempt to elucidate and understand the molecular design of excellent chiroptical properties via the combination of multiplicity and the alignment of *** stereoisomeric PDI-bladed quintuple[6]helicenes,namely D_(5)-CRP and C_(2)-CRP,were revealed to show distinct spatial arrangements of *** dichroism(CD)spectra showed that the Cotton effects(Δε)are reaching 1,412 mol-1L cm-1for D_(5)-CRP and 669 mol^(-1)L cm^(-1)for C_(2)-CRP in the visible *** greatly amplifiedΔεrelative to the smaller analogue NPDH arises from the circular annulation of helicenes and high molecular symmetry that could significantly regulate the transition dipole moments and thereby make them tend to be(anti)parallel,as supported by TDDFT calculations for the rotatory strength(R).Consequently,the maximal dissymmetry factors(|g_(abs)|and|g_(lum)|)of this kind of chiral molecular carbon imides were estimated to be up to 0.021 and 0.012,*** study provides a deep insight into the chiroptical properties of complicated chiral systems.

关键词： chiral molecular carbon imides perylene diimides quintuple helicenes molecular symmetry chiroptical properties

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Phytoplankton community structure and environmental parameters in aquaculture areas of Daya Bay,South China Sea

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Journal of Environmental Sciences 2009年第9期21卷 1268-1275页

作者： wang zhaohui ZHAO Jiangang ZHANG Yujuan CAO Yu Institute of Hydrobiology Jinan University Guangzhou 510632 China. Key Laboratory of Eutrophication and Red Tide Prevention Education Department of Guangdong Province Guangzhou 510632 China

Environmental characteristics and phytoplankton community structure were investigated in two aquaculture areas in Dapeng Cove of Daya Bay, South China Sea, between April 2005 and June 2006. Phytoplankton abundance ranged between 5.0 and 8877.5 cells/mL, with an average of 751.8 cells/mL. The seasonal cycle of phytoplankton were demonstrated by frequent oscillations, with recurrent high abundances from late spring to autumn and a peak stage in late winter. Diatoms were the predominant phytoplankton group, accounting for 93.21% of the total abundance. The next most abundant group was the dinoflagellates, which made up only 1.24% of total abundance. High concentrations of Alexandrium tamarense （Lebour） Balech with a maximum of 603.0 cells/mL were firstly recorded in this area known for high rates of paralytic shellfish poisoning （PSP） contamination. Temperatures and salinities were within the suitable values for the growth of phytoplankton, and were important in phytoplankton seasonal fluctuations. The operation of the Daya Bay Nuclear Power Station （DNPS） exerts influences on the phytoplankton community and resulted in the high abundances of toxic dinoflagellate species during the winter months. Dissolved inorganic nitrogen （DIN） and dissolved silicate （DSi） were sufficient, and rarely limited for the growth of phytoplankton. Dissolved inorganic phosphorus （DIP） was the most necessary element for phytoplankton growth. The enriched environments accelerated the growth of small diatoms, and made for the shift in predominant species from large diatom Rhizosolenia spp. to chain-forming diatoms such as Skeletonema costatum, Pseudo-nitzschia spp. and Thalassiosira subtilis.

关键词： phytoplankton environmental factor South China Sea aquaculture nuclear power station