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Corrosion Performance of Stainless Steel Reinforcement in the Concrete Prepared with seawater and Coral Waste and Its Ecological Effects

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Journal of Renewable Materials 2020年第5期8卷 513-534页

作者： Xingguo Feng Yiji Zhang Xiangyu Lu Yiwen Xu Leyuan Zhang Chao Zhu Tong Wu Yashi Yang Xuhui Zhao Jiangsu Key Laboratory of Coast Ocean Resources Development and Environment Security Hohai UniversityNanjing210098China State Key Laboratory of Green Building Materials Beijing100024China Key Laboratory of Marine Materials and Related Technologies Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China College of Water Conservancy Engineering Wanjiang University of TechnologyMaanshan243000China School of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

Durability and ecological effects of the stainless steel reinforced coral waste concrete were compared with those of the carbon steel reinforced ordinary *** results showed that the corrosion current densities of the stainless steel in the coral waste concrete were less than one-tenth of those of the carbon steel in the same grade ordinary *** stainless steel in the seawater coral waste concrete maintained passivation even after more than two years of immersion in 3.5%NaCl solution,while the carbon steel counterparts in the ordinary concrete were seriously corroded under the same ***,the corrosion current density of the stainless steel reinforcement decreased slightly with the strength grade of the coral waste *** ecological evaluation indicated that the non-renewable energy consumption and CO_(2)emission of per cubic meter of the newly constructed stainless steel reinforced coral waste concrete were 23.72%and 1.419%less than those of the carbon steel reinforced ordinary concrete with the same grade,while the aforementioned two parameters of the former material were reduced by 44.81%and 32.0%in comparison to the latter one in 50 years duration.

关键词： Coral waste stainless steel seawater green concrete corrosion

Responses of marine-derived Trichoderma fungi to seawater and their potential antagonistic behaviour

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Journal of Oceanology and Limnology 2019年第2期37卷 525-534页

作者： SONG Yinping MIAO Fengping LIU Xianghong JI Naiyun Yantai Institute of Coastal Zone Research Chinese Academy of Sciences Yantai 264003 China University of Chinese Academy of Sciences Beijing 100049 China

To explore the metabolic responses of marine-derived Trichoderma fungi to environmental stresses, the survivability, metabolism, and antagonism of ten marine isolates have been examined. Their survival in both freshwater and seawater indicates them to be facultative marine fungi, but they are more adaptable to marine environment. Most of them feature strain-specific and positive metabolic responses to seawater, which also usually result in the higher proportions of heteroatom-bearing and unsaturated units in mycelial constituents. seawater factors can promote many strains to produce bioactive metabolites, including plant pathogen- and marine phytoplankton-inhibitory and marine animal-toxic ones, but the eff ects of NaCl are often weak or negative. The inhibition of marine phytoplankton corresponds to the intracellular accumulation of heteroatom-bearing and unsaturated units under seawater condition, and the varied toxicities to marine animals further signify the divergences of lipophilic exudates under diff erent conditions. The results may contribute to further understanding and mining the structural diversity and biological activity of secondary metabolites from marine-derived Trichoderma fungi.

关键词： Trichoderma fungus metabolic response seawater antagonistic potential

Oxygen Evolution Efficiency and Chlorine Evolution Efficiency for Electrocatalytic Properties of MnO_2-based Electrodes in seawater

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Journal of Wuhan University of Technology(Materials Science) 2019年第1期34卷 69-74页

作者： YAN Zhenwei SONG Lijun TANG Mingqi FENG Zaiqiang School of Mechanical Engineering North China University of Water Resources and Electric Power Environmental Protection and Chemistry Center Suzhou Nuclear Power Research Institute School of Materials Science and Engineering North China University of Water Resources and Electric Power

To improve both oxygen evolution efficiency and stability at high temperatures, Mn, Mn+Mo, Mn+Mo+V, and Mn+Fe+V oxide electrodes were prepared on a Ti substrate, with an intermediate layer of IrO_2, by an anodic deposition method. The crystal structure, surface morphology, pore size distribution, specific surface area, and voltammetric charge were then characterized for each electrode. The results demonstrated that for Mn-O electrodes, the preferential orientation of the(100) crystal plane and the mesopore structure played negative roles in the oxygen evolution reaction. On the basis of the electrocatalytic properties of MnO2-based electrodes in seawater, the outer surface voltammetric charge at a scan rate of 500 mV·s-1 was shown to effectively indicate whether oxygen evolution reactions were preferred over chlorine evolution reactions. The Mn-O electrode exhibited oxygen evolution efficiency of only 47.27%, whereas the Mn+Mo, Mn+Mo+V and Mn+Fe+V oxide electrodes displayed oxygen evolution efficiency of nearly 100%. This means that adding Mo, V, and Fe elements to the electrode can improve its crystal structure and morphology as well as further enhancing its oxygen evolution efficiency.

关键词： electrodeposition MnO2-based electrodes oxygen evolution reaction seawater electrolysis

Corrosion performance of zinc coated steel in seawater environment

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Chinese Journal of Oceanology and Limnology 2017年第2期35卷 423-430页

作者：刘栓赵霞赵海超孙虎元陈建敏 Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technologies and EngineeringChinese Academy of Sciences Key Laboratory of Marine Environmental Corrosion and Bio-Fouling Institute of OceanologyChinese Academy of Sciences

Considering the continuous exploitation of marine resources, it is very important to study the anticorrosion performance and durability of zinc coated streel （ZCS） because its increasing use as reinforcements in seawater. Tafel polarization curves and linear polarization curves combined with electrochemical impedance spectroscopy （EIS） were employed to evaluate the corrosion performance of ZCS at Qingdao test station during long-term immersion in seawater. The results indicated that the corrosion rate of the ZCS increased obviously with immersion time in seawater. The corrosion products that formed on the zinc coated steel were loose and porous, and were mainly composed of Zn5（OH）8C12, Zn5（OH）6（CO3）2, and ZnO. Pitting corrosion occurred on the steel surface in neutral seawater, and the rate of ZCS corrosion decreased with increasing pH.

关键词： zinc coated steel seawater corrosion behavior pitting

seawater FLUX OF THE SOUTH CHINA SEA

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Chinese Journal of Oceanology and Limnology 1994年第4期12卷 339-342页

作者：韩舞鹰林洪英容荣贵 South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou

The South China Sea water can be divided according to depth into three boxes by the pycnoclineand a *** a box model with matter balance,the net seawater fluxes were calculated to be317.9×104 m3/s in box Ⅰ for the upper homogeneous layer outflowing to the adjoining oceans;67×104 m3/s in box Ⅲ for the water entering the basin;240×104 m3/s in box Ⅱ for water entering theSouth China *** upward speed of basin water was calculated to be 8.4×10-5 cm/s and that ofseawater flowing up along the pycnocline was calculated to be 8.9×10-5 cm/s.

关键词： South China Sea seawater flux

A culture-free method for detection of Vibrio vulnif icus from coastal seawater based on loop-mediated isothermal amplification targeting vcgC gene

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Acta Oceanologica Sinica 2010年第2期29卷 93-97页

作者： LI Yongjun ZHENG Zejun ZHAO Yulong WEI Xiaona ZHU Lin HUANG Xitai The College of Life Sciences Nankai University Tianjin 300071 China The College of Environmental Science and Engineering Nankni University Tianjin 300071 China

Vibrio vulnificus is an opportunistic pathogen widely distributed in estuarine and coastal seawaters. In this study, a culture-free method was developed to rapid detection of Vo vulnificus in all seasons, based on loop-mediated isothermal amplification （LAMP） targeting virulent-correlated gene （vcg）. The new assay method allows differentiation between the virulent and non-virulent strain of V. vulnificus accurately. This method also allows effective detection of the pathogeny in winter when the bacterium lives in the viable but non-culturable （VBNC） state. A total of 30 costal seawater samples collected in all seasons were used for the evaluation of this method. The results show that the method is sensitive, accurate and convenient.

关键词： Vibrio vulnificus LAMP virulence-correlated gene seawater culture-free VBNC

Two-dimensional vanadium carbide(V2CTx) MXene as supercapacitor electrode in seawater electrolyte

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Chinese Chemical Letters 2020年第4期31卷 984-987页

作者： Hongtian He Qixun Xia Bingxin Wang Libo Wang Qianku Hu Aiguo Zhou School of Materials Science and Engineering Henan Polytechnic UniversityJiaozuo 454000China

In this study,two-dimensional V2CTx MXene has been prepared by selectively etching Al layers from V2 AlC MAX phase by NaF+HCl etching at 90℃for 72 h and its performance as supercapacitor(SC)electrode were tested using simulating seawater as electrolyte.V2CTx MXene-based electrodes shows a good capacitance of 181.1 F/g,which is in accordance with the volumetric specific capacitance of 317.8 F/cm^3,and with 89.1%capacitance retention even after 5000 *** with other MXenes,V2CTx have better electrochemical performance as SC *** work provides an innovative strategy to apply V2CTx MXene as SC electrode in safety and effective seawater electrolyte.

关键词： MXene Two-dimensional carbide V2CTx Supercapacitor seawater

Measurement of trace nitrate concentrations in seawater by ion chromatography with valve switching

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Chinese Journal of Oceanology and Limnology 2014年第3期32卷 732-736页

作者：杜娟法芸郑岳李学兵杜芳林杨海燕 Public Laboratory Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences College of Materials Science and Engineering Qingdao University of Science & Technology College of Food Science and Engineering Shandong Agricultural University Heterogeneous Catalysis Conversion Group Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences

An ion chromatographic method with a valve switching facility was developed to determine trace nitrate concentrations in seawater using two pumps, two different suppressors, and two columns. A carbohydrate membrane desalter was used to reduce the high concentrations of sodium salts in samples. In this method, trace nitrate was eluted from the concentrator column to the analytical columns, while the matrix fl owed to waste. Neither chemical pre-treatment nor sample dilution was required. In the optimized separation conditions, the method showed good linearity( R >0.99) in the 0.05 and 50 mg/L concentration range, and satisfactory repeatability(RSDseawater.

关键词： ion chromatography valve switching seawater nitrate ion

A Comparative Study on the Nonspecific Immunity of Juvenile Litopenaeus vannamei ever Inhabiting Freshwater and seawater

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Journal of Ocean University of China 2014年第3期13卷 472-478页

作者： JIA Xuying DING Sen WANG Fang DONG Shuanglin Key Laboratory of Mariculture of Ministry of Education of China Ocean University of China Laboratory of Riverine Ecological Conservation and Technology Chinese Research Academy of Environmental Sciences

A study on the nonspecific immunity of Litopenaeus vannamei ever inhabiting freshwater and seawater was carried out at different molt stages by comparing their total hemocyte count(THC) and respiratory burst(RB) and activity of phenol oxidase(PO), nitric oxide synthase(NOS) and lysozyme(LY). Two-way ANOVA showed that salinity and molt stage independently affected THC and RB and the activity of PO, NOS and LY of juvenile L. vannamei significantly(P seawater. The activity of PO peaked at the inter-molt stage(C), and touched the lowest at the post-molt stage in freshwater and pre-molt stage in seawater. The activity of LY was stable over the molt cycle. The RB and the activity of PO, NOS and LY of juvenile L. vannamei were significantly lower in freshwater than in seawater; whereas THC was significantly higher in freshwater than in seawater(P < 0.05). It was concluded that the post-molt stage(especially stage A) was critical to shrimp culture, which should be intensively attended when L. vannamei was cultured in freshwater.

关键词： Litopenaeus vannamei nonspecific immunity freshwater seawater molt stage