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| 1 | A study of electron-shuttle mechanism in Klebsiella pneumoniae based-microbial fuel cells显示文摘In microbial fuel cell (MFC), the rate of electron transfer to anode electrode is a key intrinsic limiting factor on the power output of MFCs. Using Klebsiella pneumoniae (K. pneumoniae) strain L17 as biocatalyst, we studied the mechanism of electron shuttle via self-producing mediator in a cubic air-chamber MFC. To eliminate the influence of biofilm mechanism, the anode electrode was coated with microfiltration membrane (0.22 μm). Data showed that the microfiltration membrane coated and uncoated MFCs achieved the maximum voltage outputs of 316.2 and 426.2 mV after 270 and 120 h, respectively. When the medium was replaced in MFCs that had the highest power generation, the power output dropped by 62.1% and 8.8%, and required 120 and 48 h to resume the original level in the coated and uncoated MFCs, respectively. The results suggested an electron-shuttle mechanism rather than biofilm mechanism was responsible for electricity generation in the membrane coated MFC. Cyclic voltammetric measurements demonstrated the presence of an electrochemical active compound produced by K. pneumoniae strain L17, which was identified to be 2,6-di-tert-butyl-p-benzoquinon (2,6-DTBBQ) by GC-MS. 2,6-DTBBQ, as a recyclable electron shuttle, could transfer electrons between K. pneumoniae L17 and the anode electrode. | DENG LiFang LI FangBai ZHOU ShunGui HUANG DeYin NI JinRen | 2010 | Chinese Science Bulletin2010，55，1： | 9 |
| 2 | Characteristics of Pb^(2+) biosorption with aerobic granular biomass显示文摘Experimental studies were conducted on the feasibility of aerobic granular biomass as a novel type of biosorbent for Pb2+ removal. The results show that the initial pH, Pb2+ concentration (C0) and biomass concentration (X0) affected the biosorption process significantly. Both the Freundlich and Langmuir isotherm models describe the biosorption process accurately, with correlation coefficients of 0.932 and 0.959 respectively. The Pb2+ biosorption kinetics is interpreted as having two stages, with the second stage described reasonably well by a Lagergren pseudo-second order model. Moreover, the surface change of granular biomass after the Pb2+ biosorption process appears to be caused by ion exchange and metal chelation according to the analysis results of Environmental Scanning Electron Microscopy (ESEM) and Energy Dispersive X-ray Spectroscopy (EDX). | YAO Lei YE ZhengFang WANG ZhongYou NI JinRen | 2008 | Chinese Science Bulletin2008，53，6： | 9 |
| 3 | Water demand for ecosystem protection in rivers with hyper-concentrated sediment-laden flow显示文摘Sediment transport is one of the main concerns in a river system with hyper-concentrated flows. Therefore, the water use for sediment transport must be considered in study on the water demand for river ecosystem. The conventional methods for calculating the Minimum Water Demand for River Ecosystem (MWDRE) are not appropriate for rivers with high sediment concentration. This paper studied the MWDRE in wet season, dry season and the whole year under different water-and-sediment conditions in the Lower Yellow River, which is regarded as a typical river with sediment-laden flows. The characteristics of MWDRE in the river are analyzed. Firstly, the water demand for sediment transport (WDST) is much larger than the demands for other riverine functions, the WDST accounts for the absolute majority of the MWDRE. Secondly, in wet season when the WDST is satisfied, not only most of the annual incoming sediment can be transported downstream, but also the water demands for other river functions can be satisfied automatically, so that the MWDRE in wet season is identical to the WDST. Thirdly, in dry season, when the WDST is satisfied, the water demands for other river functions can also be satisfied, but the low sediment transport efficiency results in significant waste of water resources. According to these characteristics and aiming at decreasing sediment deposition in the riverbed and improving the utilization efficiency of water resources, hydrological engineering works can be used to regulate or control flow and sediment so that the sediment incoming in dry season can be accumulated and be transported downstream intensively and thus efficiently in wet season. | LUO Huaming, LI Tianhong, NI Jinren & WANG Yudong Department of Environmental Engineering, Peking University, Beijing 100871, China The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China | 2004 | Science China(Technological Sciences)2004，47，z1： | 8 |
| 4 | Photocatalytic degradation of amoxicillin by carbon quantum dots modified K2Ti6O13 nanotubes:Effect of light wavelength显示文摘A novel carbon quantum dots modified potassium titanate nanotubes(CQDs/K2 Ti6 O13)composite photocatalyst was synthesized by hydrothermal treatment combined with calcination.X-ray diffraction(XRD)pattern and transmission electron microscopy(TEM)indicated formation of potassium titanate nanotubes and successful deposition of CQDs onto K2 Ti6 O13.The photocatalytic performance of CQDs/K2 Ti6 O13 composite was evaluated by degradation of amoxicillin(AMX)under the irradiation of visible light and lights with the wavelengths of 365,385,420,450,485,520,595 and 630 nm.The results showed that the photocatalytic activity of CQDs/K2 Ti6 O13 hybrid material was greatly enhanced compared with the neat K2 Ti6 O13 calcined at 300 ℃.The narrowed band gap energy(Eg)and transfer of photo-excited electron by CQDs inhibited the immediate combination of electron-hole pairs,thus promoting photocatalytic activity.Moreover,CQ,Ds/K2 Ti6 O13 exhibited a broad spectrum of photocatalytic ability and it was interesting that the photocatalytic activity decreased with the increase of the irradiation wavelength.Reactive oxygen species(ROS)quenching tests suggested the hole(h^+)and hydroxyl radical(^·OH)played the primary roles in photocatalytic degradation of AMX.Moreover,CQ.Ds/K2 Ti6 O13 showed good reusability for AMX photocatalytic degradation after five successive runs.This study proposed an available method for titanate nanomaterials modification,and the developed novel CQDs/K2 Ti6 O13hyb rid material is p ro mising fo r potential application on antibiotics removal fro m water and wastewater. | Qiankun Chen Long Chen Juanjuan Qi Yingqian Tong Yitao Lv Chaokai Xu Jinren Ni Wen Liu | 2019 | Chinese Chemical Letters2019，30，6： | 6 |
| 5 | Sorption of Triton X-100 on soil organic matter fractions:Kinetics and isotherms显示文摘Kinetics and isotherms of Triton X-100 sorption on soil,base-extracted soil(BE),humic acid(HA) and humin(HM) were investigated respectively to get better understanding on characteristics of the surfactant sorption onto different soil organic matters(SOMs).It was demonstrated that the kinetics results could be satisfactorily described by the pseudo-second order model.The half of the time to reach equilibrium(t1/2) for different sorbents followed the sequence of soil > HA > BE > HM.Furthermore,the calculated equilibrium sorption capacity(Ceq) was found in the sequence of HA > BE > HM > soil,which agreed well with the experimental results.The isotherms of Triton X-100 sorption on soil and HA could be well described by the S-type isotherm,but BE and HM by the L-type.The isotherms of all the four sorbents were found reasonably fitted to the Langmuir equation.The Kd value,defined as the ratio of Triton X-100 in sorbent and in the equilibrium solution for given concentrations,generally followed the order of HM > HA > soil > BE.Separated HM and HA showed high affnity for Triton X-100,but the HA and HM in soil and BE were tightly bounded by the minerals.Thus,the HA on the soil surface might dominate the sorption,whereas the bounded HM would play a key role upon the surfactants being penetrated inside the soil. | ZHANG Guangzhi HU Hao SUN Weiling NI Jinren | 2009 | Journal of Environmental Sciences2009，21，6： | 6 |
| 6 | Structural characteristics of river networks and their relations to basin factors in the Yangtze and Yellow River basins显示文摘The integration of rivers and basins highly implies the possible existence of certain relationships between hierarchical characteristics of river networks and primary basin factors.Here we investigated river networks in two large basins,the Yangtze River and the Yellow River,characterized with basic factors such as annual precipitation,slope,soil erodibility and vegetation.Hierarchical analysis demonstrated a fair self-similarity of river networks at the stream-order 1-5 in both rivers,described by the structural parameters including bifurcation ratio,side-branching ratio,drainage density,and length of headwater-river.Besides precipitation,basin slope was essential in shaping river networks in both basins,showing a significant positive correlation(R^2=0.39-0.85)to bifurcation ratio,side-branching ratio,and drainage density.Given the same basin slope(5°-15°),the higher soil erodibility and sparse vegetation would promote greater side-branching ratio and drainage density in the Yellow River,which were estimated 11.97%and 63.70%larger,respectively than those in the Yangtze River.This study highlights the importance to formulate basin-specific strategies for water and soil conservation in terms of different structures of river networks. | CHEN XiaBin WANG YiChu NI JinRen | 2019 | Science China(Technological Sciences)2019，62，11： | 5 |
| 7 | Solving the mystery of vanishing rivers in China显示文摘A major controversy was sparked worldwide by a recent national water census claiming that the number of Chinese rivers with watersheds>100 km^2 was less than half the previous estimate of 50000 rivers,which also stimulates debates on the potential causes and consequences.Here,we estimated the number of rivers in terms of stream-segmentation characteristics described by Horton,Strahler and Shreve stream-order rules,as well as their mixed mode for named rivers recorded in the Encyclopedia of Rivers and Lakes in China.As a result,the number of‘vanishing rivers’has been found to be highly relevant to statistical specifications in addition to the erroneous inclusion of pseudo-rivers primarily generated in arid or frost-thaw areas.The modified Horton stream-order scheme reasonably depicts the configuration of complete natural streams from headwater to destination,while the Strahler largely projects the fragmentation of the named river networks associated with human aggregation to the hierarchical river systems. | Yichu Wang Jinren Ni Yao Yue Jiaye Li Alistair GLBorthwick Ximing Cai An Xue Li Li Guangqian Wang | 2019 | National Science Review2019，6，6： | 4 |
| 8 | Microscopic view of phytoplankton along the Yangtze River显示文摘Phytoplankton play an important role in nutrient cycling and energy conversion. However, phytoplankton community is poorly understood in large river ecosystems. Based on the large-scale samplings conducted in spring and autumn of 2017, a systematic study has been made on seasonal and spatial distributions of phytoplankton community along the mainstream of the Yangtze River. As results, 6 phyla were identified and 59 phytoplankton species were detected using microscopy, including Bacillariophyta(29 species), Chlorophyta(13 species) and Cyanophyta(8 species) as the dominant group. Moreover, the density of phytoplankton was ranged 0.05×10^6–1.90×10^6 cells/L and the biomass was 0.01–1.01 mg/L, both reaching their maximum in the middle reach from Yichang to Wuhan. Significant seasonal difference of phytoplankton community was observed and spatial dissimilarity in spring was revealed. The cell abundance and biomass of phytoplankton could be fairly estimated by chlorophylla, and redundancy analysis indicated that water temperature, dissolved oxygen, biochemical oxygen demand, nitrite, and ammonia nitrogen were the most important explanatory environmental factors for phytoplankton compositions in the Yangtze River. | LIU YuXin XU XuMing WANG Ting NI JinRen | 2019 | Science China(Technological Sciences)2019，62，11： | 3 |
| 9 | Three Gorges Dam: friend or foe of riverine greenhouse gases?显示文摘Dams are often regarded as greenhouse gas(GHG) emitters. However, our study indicated that the world’s largest dam, the Three Gorges Dam(TGD), has caused significant drops in annual average emissions of CO, CHand NO over 4300 km along the Yangtze River, accompanied by remarkable reductions in the annual export of CO(79%), CH(50%) and NO(9%) to the sea. Since the commencement of its operation in 2003, the TGD has altered the carbonate equilibrium in the reservoir area, enhanced methanogenesis in the upstream, and restrained methanogenesis and denitrification via modifying anoxic habitats through long-distance scouring in the downstream. These findings suggest that ‘large-dam effects’ are far beyond our previous understanding spatiotemporally, which highlights the fundamental importance of whole-system budgeting of GHGs under the profound impacts of huge dams. | Jinren Ni Haizhen Wang Tao Ma Rong Huang Philippe Ciais Zhe Li Yao Yue Jinfeng Chen Bin Li Yuchun Wang Maosheng Zheng Ting Wang Alistair G.L.Borthwick | 2022 | National Science Review2022，9，6： | 3 |
| 10 | Mechanism of combination membrane and electro-winning process on treatment and remediation of Cu^(2+) polluted water body显示文摘Mechanism of treatment and remediation of synthetic Cu2+ polluted water body by membrane and electro-winning combination process was investigated.The influences of electrolysis voltage,pH,and electrolysis time on the metal recovery effciencies were studied.Relationship between trans-membrane pressure drop(△P),additions ratio,initial Cu2+ concentration on operating effciency,stability of membrane and the possibility of water reuse were also investigated.The morphology of membrane and electrodes were observed using scanning electron microscopy(SEM),the composition of surface deposits was ascertained using combined energy dispersive X-ray spectroscopy(EDX) and atomic absorption spectrophotometer.The results showed that using low pressure reverse osmosis(LPRO),Cu2+ concentration could increase from 20 to 100 mg/L or even higher in concentrated solutions and permeate water conductivity could be less than 20 μS/cm.The addition of sodium dodecy/sulfate sodium dodecyl sulfate improved Cu2+ removal effciency,while EDTA had little side influence.In electro-reduction process,using plante electrode cell,Cu2+ concentration could be further reduced to 5 mg/L,and the average current effciency ranged from 9% to 40%.Using 3D electrolysis treatment,Cu2+ concentration could be reduced to 0.5 mg/L with a current effciency range 60%-70%. | ZHANG Linnan WU Yanjun QU Xiaoyan LI Zhenshan NI Jinren | 2009 | Journal of Environmental Sciences2009，21，6： | 3 |
| 11 | ON THE VERTICAL DISTRIBUTION OF SUSPENDED SEDIMENT CONCENTRATION显示文摘The problem of sediment concentration distribution in a vertical for channel and pipe flows is studied in this paper. Considering the variation of the vertical component of the fluctuation velocity v as an independent variable, two types of sediment concentration distribution can be derived. However, only one type of distribution is commonly quoted while the other one rarely reported. In this paper explanation for such phenomena is given and conditions for the occurrence of both types are also discussed. | NI Jinren and WANG Guangqian Dr. of Eng- Dept. of Geography, Peking University, China Dr. of Eng. Institute of Mechanics, Chinese Academy of Sciences, China | 1991 | International Journal of Sediment Research1991，6，3： | 2 |
| 12 | Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes显示文摘 | Xiuping Zhu Jinren Ni Peng Lai | 2009 | Water Research2009，，17： | 2 |
| 13 | Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes显示文摘 | Zhu Xiuping Ni Jinren Lai Peng | 2009 | Water Research2009，43，17： | 1 |
| 14 | Applicability of Langmuir equation to copper sorption by loess with high carbonate content显示文摘 | Ni Jinren and Sun Weiling | 2003 | Hydrobiologia2003，494，13： | 1 |
| 15 | Comparative electrochemical degradation of phthalic acid esters using boron-doped diamond and Pt anodes显示文摘 | Hongna Li Xiuping Zhu Yi Jiang Jinren Ni | 2010 | Chemosphere2010，，8： | 1 |
| 16 | Destination of organic pollutants during electrochemical oxidation of biologically-pretreated dye wastewater using boron-doped diamond anode显示文摘 | Xiuping Zhu Jinren Ni Junjun Wei Xuan Xing Hongna Li | 2011 | Journal of Hazardous Materials2011，，1： | 1 |
| 17 | Enrichment and characteri- zation of a bacteria consortium capable of beterotrophic nitrification and aerobic denitrification at low temperature 显示文摘 | Yao Shuo Ni Jinren Chen Qian | 2013 | BioresourceTechnology2013，127，： | 1 |
| 18 | Kinetic theory for parti-cle concentration distribution in two-phase flow 显示文摘 | Wang Guangqian Ni Jinren | 1990 | Journal of Engineering Mechanics1990，116，12： | 1 |
| 19 | Treatment of landfill leachate by immobilized microorganisms显示文摘This paper focuses on the outcome and the main performance of the immobilized microbial that treats landfill leachate. Based on the analysis of COD and ammonia-nitrogen of the influent and effluent, research was done on the high removal efficiency of COD and ammonium nitrogen by immobilized microbial. The leachate composition was analyzed qualitatively using GC-MS before and after being treated. Biological loading of efficient microbial flora on the carrier was measured by Kjeldahl’s method. Finally, the patterns of immobilized microbe were observed through scanning electron microscopy (SEM). The results showed that in immobilized microorganisms system, the efficiencies of COD and nitrogen were 98.3% and 99.9%, respectively. There was a great reduction of organic components in effluent. When the immobilized biomass on the carrier was 38 g·L?1 (H2O), the filamentous microorganism was highly developed. There was no inhibitory effect on the nitrobacteria and nitrococcus, when ammonia was over 200 mg·L?1 and NH3 over 150 mg·L?1. At a high organic loading, it still had good nitrification. This paper also compares the performance of immobilized microbial with free microbial under the same condition. The immobilized microbial technology demonstrated better than the latter in all aspects. | YE ZhengFang YU HongYan WEN LiLi NI JinRen | 2008 | Science China Chemistry2008，51，10： | 1 |
| 20 | Advanced Treatment of Biologically Pretreated Coking Wastewater by Electrochemical Oxidation Using Boron-Doped Diamond Electrodes显示文摘 | Zhu Xiuping Ni Jinren Lai Peng | 2009 | Water Res2009，43，17： | 1 |
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