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Novel polyhydroxy cationic collector N-(2,3-propanediol)-Ndodecylamine: Synthesis and flotation performance to hematite and quartz

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International Journal of Mining Science and Technology 2023年第1期33卷 115-122页

作者： Wenbao Liu Xiangyu Peng Wengang Liu Kelin Tong Yanbai Shen Qiang Zhao Sikai Zhao Wenhan Sun School of resources and Civil Engineering Northeastern UniversityShenyang 110819China Science and Technology Innovation center of Smart Water and resource environment Northeastern UniversityShenyang 110819China

To enhance the performance of traditional cationic collector,a novel polyhydroxy amine collector N-(2,3-Propanediol)-N-dodecylamine(PDDA)was designed by introducing one propylene glycol group into dodecylamine(DDA).It was prepared by a nucleophilic substitution reaction,which showed better solubility and hydrophobicity than DDA and was firstly employed as the collector for the separation of hematite and *** tests showed that PDDA had an excellent flotation performance and significantly better selectivity than *** addition,the flotation performance and adsorption mechanism of PDDA on hematite and quartz surfaces were studied using Fourier transform infrared spectroscopy(FTIR),zeta potential and X-ray photoelectron spectroscopy(XPS)*** results demonstrated that the interaction between PDDA and the minerals’surfaces was mainly electrostatic adsorption and hydrogen bond,while PDDA tended to adsorb on the surfaces of quartz more than that of *** optimization of amine collectors by introducing hydroxyl was also verified,which was of great meaning to the design,development,and application of the polyhydroxy cationic *** conclusion,PDDA could be used as a potential collector in the flotation separation of quartz and hematite.

关键词： Polyhydroxy collector Quartz Hematite Interaction mechanism Hydrogen bonding

Efficient treatment of azo dye containing wastewater in a hybrid acidogenic bioreactor stimulated by biocatalyzed electrolysis

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Journal of environmental Sciences 2016年第1期28卷 198-207页

作者： Hong-Cheng Wang Hao-Yi Cheng Shu-Sen Wang Dan Cui Jing-Long Han Ya-Ping Hu Shi-Gang Su Ai-Jie Wang Key Laboratory of environmental Biotechnology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences State Key Laboratory of Urban Water resource and environment Harbin Institute of Technology

In this study, a novel scaled-up hybrid acidogenic bioreactor（HAB） was designed and adopted to evaluate the performance of azo dye（acid red G, ARG） containing wastewater treatment. Principally, HAB is an acidogenic bioreactor coupled with a biocatalyzed electrolysis module. The effects of hydraulic retention time（HRT） and ARG loading rate on the performance of HAB were investigated. In addition, the influent was switched from synthetic wastewater to domestic wastewater to examine the key parameters for the application of HAB. The results showed that the introduction of the biocatalyzed electrolysis module could enhance anoxic decolorization and COD（chemical oxygen demand） removal. The combined process of HAB-CASS presented superior performance compared to a control system without biocatalyzed electrolysis（AB-CASS）. When the influent was switched to domestic wastewater, with an environment having more balanced nutrients and diverse organic matters, the ARG, COD and nitrogen removal efficiencies of HAB-CASS were further improved, reaching 73.3% ± 2.5%, 86.2% ± 3.8% and 93.5% ± 1.6% at HRT of 6 hr, respectively, which were much higher than those of AB-CASS（61.1% ± 4.7%,75.4% ± 5.0% and 82.1% ± 2.1%, respectively）. Moreover, larger TCV/TV（total cathode volume/total volume） for HAB led to higher current and ARG removal. The ARG removal efficiency and current at TCV/TV of 0.15 were 39.2% ± 3.7% and 28.30 ± 1.48 mA,respectively. They were significantly increased to 62.1% ± 2.0% and 34.55 ± 0.83 mA at TCV/TV of 0.25. These results show that HAB system could be used to effectively treat real wastewater.

关键词： HAB(hybrid acidogenic bioreactor) Scale-up Azo dye Domestic wastewater Cyclic activated sludge system(CASS)

Achieving low effluent NO_3-N and TN concentrations in low influent chemical oxygen demand(COD) to total Kjeldahl nitrogen(TKN) ratio without using external carbon source

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Chinese Journal of Oceanology and Limnology 2015年第4期33卷 1039-1052页

作者：操家顺 OLEYIBLO Oloche James 薛朝霞 OTACHE Y.Martins 冯骞 Key Laboratory of Integrated Regulation and resource Development on Shallow Lake of Ministry of Education College of Environment Hohai University College of environment Hohai University National Engineering Research center of Water resource Efficient Utilization and Engineering Safety Hohai University Department of Agricultural & Bioresources Engineering Federal University of Technology

Two mathematical models were used to optimize the performance of a full-scale biological nutrient removal(BNR) activated treatment plant, a plug-flow bioreactors operated in a 3-stage phoredox process configuration, anaerobic anoxic oxic(A2 /O). The ASM2 d implemented on the platform of WEST2011 software and the Bio Win activated sludge/anaerobic digestion(AS/AD) models were used in this study with the aim of consistently achieving the designed effluent criteria at a low operational cost. Four ASM2 d parameters(the reduction factor for denitrification(η NO3, H), the maximum growth rate of heterotrophs( μ H), the rate constant for stored polyphosphates in PAOs(q pp), and the hydrolysis rate constant(k h)) were adjusted. Whereas three Bio Win parameters(aerobic decay rate(b H), heterotrophic dissolved oxygen(DO) half saturation(K OA), and Y P /acetic) were adjusted. Calibration of the two models was successful; both models have average relative deviations(ARD) less than 10% for all the output variables. Low effluent concentrations of nitrate nitrogen(N-NO3), total nitrogen(TN), and total phosphorus(TP) were achieved in a full-scale BNR treatment plant having low influent chemical oxygen demand(COD) to total Kjeldahl nitrogen(TKN) ratio(COD/TKN). The effluent total nitrogen and nitrate nitrogen concentrations were improved by 50% and energy consumption was reduced by approximately 25%, which was accomplished by converting the two-pass aerobic compartment of the plug-flow bioreactor to anoxic reactors and being operated in an alternating mode. Findings in this work are helpful in improving the operation of wastewater treatment plant while eliminating the cost of external carbon source and reducing energy consumption.

关键词： anaerobic anoxic oxic (A2/O) process activated sludge ASM2d BioWin AS/AD WEST2011

Magnetic properties of surface soils across the southern Tarim basin and their relationship with climate and source materials

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Chinese Science Bulletin 2011年第3期56卷 290-296页

作者： ZAN JinBo FANG XiaoMin NIE JunSheng YANG ShengLi SONG ChunHui DAI Shuang center for basin resource and environment Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China Key Laboratory of Western China's environmental Systems Ministry of Education of China Lanzhou 730000 China College of Geography Science Nanjing Normal University Nanjing 210046 China

The magnetic susceptibility (χ) of surface soils on the Chinese Loess Plateau (CLP) has strong positive correlation with mean annual *** is widely accepted that ultrafine magnetite/maghemite grains produced during pedogenesis are responsible for the enhancement of χ,and loess χ on the CLP has been widely used as a proxy for the intensity of the East Asian summer ***,few works have investigated mechanisms for the enhancement of χ in the case of surface aeolian sediments in westerly-dominated inland China,north of the Tibetan *** detailed rock magnetism and grain size studies of 49 surface samples taken across the southern Tarim basin for different rainfall/temperature/altitude conditions are *** results show that samples taken from desert have the lowest χ values and that χ of loessic sand and loess samples decreases with increasing *** addition,the rock magnetism studies suggest that the magnetic properties of surface soils across the southern Tarim basin are mainly controlled by the concentration of coarse aeolian ferrimagnetic *** contribution of ultrafine pedogenically produced magnetic grains to χ is very limited.

关键词：塔里木盆地表层土壤磁学性质中国黄土高原材料气候青藏高原北部岩石磁学

Modeling assessment for ammonium nitrogen recovery from wastewater by chemical precipitation

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Journal of environmental Sciences 2011年第6期23卷 881-890页

作者： Tao Zhang Qiucheng Li Lili Ding Hongqiang Ren Ke Xu Yonggang Wu Dong Sheng State Key Laboratory of Pollution Control and resource Reuse School of the Environment Nanjing University Nanjing 210093 China Modern Analysis center Nanjing University Nanjing 210093 China

Chemical precipitation to form magnesium ammonium phosphate（MAP） is an effective technology for recovering ammonium nitrogen（NH4＋-N）.In the present research,we investigated the thermodynamic modeling of the PHREEQC program for NH4＋-N recovery to evaluate the effect of reaction factors on MAP *** case study of NH4＋-N recovery from coking wastewater was conducted to provide a *** surface methodology（RSM） was applied to assist in understanding the relative significance of reaction factors and the interactive effects of solution *** modeling indicated that the saturation index（SI） of MAP followed a polynomial function of *** SI of MAP increased logarithmically with the Mg2＋/NH4＋ molar ratio（Mg/N） and the initial NH4＋-N concentration（CN）,respectively,while it decreased with an increase in Ca2＋/NH4＋ and CO32？/NH4＋ molar ratios（Ca/N and CO32？/N）,*** trends for NH4＋-N removal at different pH and Mg/N levels were similar to the thermodynamic modeling *** RSM analysis indicated that the factors including pH,Mg/N,CN,Ca/N,（Mg/N）×（CO32？/N）,（pH）2,（Mg/N）2,and（CN）2 were *** surface plots were useful for understanding the interaction effects on NH4＋-N recovery.

关键词： ammonium nitrogen magnesium ammonium phosphate PHREEQC program response surface methodology

Particle number size distributions and formation and growth rates of different new particle formation types of a megacity in China

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Journal of environmental Sciences 2023年第9期131卷 11-25页

作者： Liang Dai Yu Zhao Lei Zhang Dong Chen Rongrong Wu State Key Laboratory of Pollution Control and resource Reuse and School of the environment Nanjing UniversityJiangsu 210023China Jiangsu Collaborative Innovation center of Atmospheric environment and Equipment Technology(CICAEET) Nanjing University of Information Science and TechnologyJiangsu 210044China

To understand the contribution of new particle formation(NPF)events to ambient fine particle pollution,measurements of particle size distributions,trace gases and meteorological conditions,were conducted at a suburban site(NJU)from October to December 2016 and at an industrial site(NUIST)from September to November 2015 in *** to the temporal evolution of the particle size distributions,three types NPF events were observed:typical NPF(Type A),moderate NPF events(Type B)and strong NPF(Type C)*** favorable conditions for Type A events included low relative humidity,low concentration of pre-existing particles,and high solar *** favorable conditions of Type B events were similar to Type A,except for a higher concentration of pre-existing *** C events were more likely to happen with the higher relative humidity,lower solar radiation and continuous growth of pre-existing particle *** formation rate of 3 nm(J3)was the lowest for Type A events and highest for Type C *** contrast,the growth rates of 10 nm and 40 nm particles were the highest for Type A,and lowest for Type *** show that NPF events with only higher J3 would lead to the accumulation of nucleation mode *** acid was important for the formation of particles but had little effect on the growth of particle size.

关键词： New particle formation Size distribution Formation and growth rate Aerosol pollution

PREPARATION AND CHARACTERIZATION OF POLYMER-BASED SPHERICAL ACTIVATED CARBONS

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Chinese Journal of Polymer Science 2008年第5期26卷 645-651页

作者：李爱民 State Key Laboratory of Pollution Control and resource Reuse Jiangsu Engineering and Technology Research Center for Organic Toxicant Control and Resource ReuseSchool of the EnvironmentNanjing UniversityNanjing 210093China

A series of spherical activated carbons(SACs)with different pore structures were prepared from chloromethylated polydivinylbenzene by ZnCl_2 *** effects of activation temperature and retention time on the yield and textural properties of the resulting SACs were *** the SACs are generated with high yield of above 65% and exhibit relatively high mesopore fraction(me%)of 35.7%-43.6% compared with conventional activated *** sample zlc28 prepared at 800℃for 2 h has the largest BET surf...

关键词： Spherical activated carbon Polymer Chemical activation Pore structure Adsorption.

TiO_2 photocatalytic antifungal technique for crops diseases control

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Journal of environmental Sciences 2006年第2期18卷 397-401页

作者： LU Jian-wei LI Fang-bai GUO Ting LIN Lan-wen HOU Mei-fang LIU Tong-xu Faculty of resource and environment center China Agricultural University Wuhan 430070 China Guangdong Key Laboratory of Agricultural environment Pollution Integrated Control Guangdong Institute of Eco-Environment and Soil Sciences Guangzhou 510650 China South China Institute of Botany Chinese Academy of Sciences Guangzhou 510650 China

TiO2 and 1% Ce^3＋-TiO2 prepared by hydrothermal method were characterized by means of XRD and UV-visible diffusive reflectance spectra（DRS）. The results of DRS analysis indicated that the 1% Ce^3＋-TiO2 catalyst had significant optical absorption in the visible region between 400-450 nm because electrons could be excited from the valence band of TiO2 or cerium oxides to Ce 4f level. To investigate the photocatalytic activity of different catalysts for crop fungal disease control, a series of Quine tests were carried out for cucumber powdery mildew and litchi downy blight control in home-made photocatalytic reactor. The results showed that TiO2 photocatalysis technique should be effective to inhibit the growth of fungal diseases to some extent and P-25 had a higher activity for antifungal control than home-made TiO2 catalysts. TiO2-A prepared with Ti（SO4）2 is more active to contro 1 antifungal disease than TiO2-B prepared with TiOSO4 as precursor because the crystalline of TiO2-A was higher than that of TiO2-B. The antifungal index litchi downy blight control was greatly enhanced by doping 1% cerium ion. The antifungal index of 1.0%Ce3^＋-TiO2 was（47.0 ± 4.7）%, （82.2 ± 3.5）%, （100 ±0.0）% under indoor weaker light, solar light and black light, respectively. The results of field experiments showed that the antifungal index of 1.0%Ce^3＋-TiO2 was more than that of P-25. The antifungal index of 1.0%Ce^3＋-TiO2 was （81.7 ± 6.5）%, （67.5 ±4.7）%, （38.6±1.9）% for litchi downy blight, maize southern leaf spot, and rice blast, respectively. It was concluded that TiO2 photocatalysis technique should be an effective way for litchi fungal disease control in practice.

关键词： titanium dioxide photocatalytic fungal disease solar light litchi downy blight

Facile synthesis of Ag-modified manganese oxide for effective catalytic ozone decomposition

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Journal of environmental Sciences 2019年第6期31卷 159-168页

作者： Xiaotong Li Jinzhu Ma Changbin Zhang Runduo Zhang Hong He State Key Laboratory of Chemical resource Engineering Beijing Key Laboratory of Energy Environmental Catalysis Beijing University of Chemical Technology State Key Joint Laboratory of environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences center for Excellence in Regional Atmospheric environment Institute of Urban Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

O3 decomposition catalysts with excellent performance still need to be developed. In this study, Ag-modified manganese oxides(AgMnOx) were synthesized by a simple co-precipitation method. The effect of calcination temperature on the activity of MnOx and AgMnOxcatalysts was investigated. The effect of the amount of Ag addition on the activity and structure of the catalysts was further studied by activity testing and characterization by a variety of techniques. The activity of 8%AgMnOxfor ozone decomposition was significantly enhanced due to the formation of the Ag1.8 Mn8 O16 structure, indicating that this phase has excellent performance for ozone *** weight content of Ag1.8 Mn8 O16 in the 8%AgMnOxcatalyst was only about 33.76%, which further indicates the excellent performance of the Ag1.8 Mn8 O16 phase for ozone decomposition. The H2 temperature programmed reduction(H2-TPR) results indicated that the reducibility of the catalysts increased due to the formation of the Ag1.8 Mn8 O16 *** study provides guidance for a follow-up study on Ag-modified manganese oxide catalysts for ozone decomposition.

关键词： Ag-modified manganese oxide Ag-Hollandite Ozone decomposition Co-precipitation method