摘要：
Rice straw biochar that produced at three pyrolysis temperatures (400, 500 and 600 degrees C) were used to investigate the adsorption properties of 17 beta-estradiol (E2). The biochar samples were characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), elemental analysis and BET surface area measurements. The influences of pyrolysis temperature, E2 concentration, pH, ionic strength, background electrolyte and humic acid were studied. Kinetic and isotherm results illustrated that the adsorption process could be well described by pseudo-second-order and Freundlich models. Experimental results showed that ionic strength had less influence on the adsorption of E2 by 500 and 600 degrees C rice straw biochar. Further, multivalent ions had positive impact on E2 removal than monovalent ions and the influence of the pyrolysis temperature was unremarkable when background electrolyte existed in solutions. The adsorption capacity of E2 decreased with the pH ranged from 3.0 to 12.0 and the humic acid concentration from 2 to 10 mg L-1. Electrostatic attractions and pi-pi interaction were involved in the adsorption mechanisms. Compared to low-temperature biochar, high-temperature biochar exhibited a better adsorption capacity for E2 in aqueous solution, indicated it had a greater potential for E2 pollution control.
作者机构：
[Yin, Zhihong] College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. Yinzhihong@hnu.edu.cn;[Yin, Zhihong] Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China. Yinzhihong@hnu.edu.cn;[Ning, Qimeng] College of Environmental Science and Engineering, Hunan University, Changsha 410082, China. ningqimeng@163.com;[Ning, Qimeng] Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China. ningqimeng@163.com;[Ning, Qimeng] School of Architecture and Urban Planning, Hunan City University, Yiyang 413000, China. ningqimeng@163.com
通讯机构：
[Jiang, Luhua; Yin, Zhihong; Zeng, Guangming; Tian, Sirong; Liu, Ni; Ning, Qimeng; Liu, Yunguo; Wang, Xiaohua; Tan, Xiaofei] College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.;[Jiang, Luhua; Yin, Zhihong; Zeng, Guangming; Tian, Sirong; Liu, Ni; Ning, Qimeng; Liu, Yunguo; Wang, Xiaohua; Tan, Xiaofei] Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.;[Liu, Shaobo] School of Architecture and Art, Central South University, Changsha 410082, China.;[Liu, Shaobo] School of Metallurgy and Environment, Central South University, Changsha 410083, China.;[Ning, Qimeng; Wang, Xiaohua] School of Architecture and Urban Planning, Hunan City University, Yiyang 413000, China.
摘要：
Fe(-)Mn binary oxide nanoparticles (FMBON) were reported to be high performance as adsorbent for pollutants removal from aqueous solution. However, there are still limitations in practice application due to the FMBON tend to aggregate into the micro millimeter level. In order to avoid the agglomeration of nanoparticles, this work synthesized the stabilized Fe(-)Mn binary oxide nanoparticles (CMC-FMBON) by using water-soluble carboxymethyl celluloses (CMC) as the stabilizer. The characteristics of CMC-FMBON and FMBON were measured by using Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and Zeta potential. This work systematically investigated the adsorption capacity of CMC-FMBON for 17beta-estradiol (E2) and the influences of external environmental factors on E2 removal. The results indicated that CMC-FMBON had much smaller particles, wider dispersion and larger surface area than the FMBON. CMC-FMBON showed better adsorption performance for E2 than FMBON with the maximum adsorption capacity of CMC-FMBON and FMBON were 124.10 and 98.14 mg/g at 298 K, respectively. The experimental data can be well fitted by the model of pseudo-second-order and Langmuir model. The E2 removal by CMC-FMBON was obviously dependent on pH with the maximum adsorption occurring when the pH was acidic. The removal capacity of CMC-FMBON increased when enhancing ionic strength in solution. Background electrolytes promoted slightly E2 adsorption process whereas the presence of humic acid inhibited the E2 removal. pi-pi interactions, hydrogen bonds, and oxidation might be responsible for E2 removal. This research suggested that the CMC-FMBON has been considered to be a cost-efficient adsorbent for removing E2 from water.
作者机构：
[Zhou, Yinkang; Jin, Xiaobin; Zhang, Honghui; Yang, Xuhong] School of Geographic and Oceanographic Sciences of Nanjing University, Nanjing, Jiangsu, China;[Zhang, Honghui] School of Architecture and Urban Planning, Hunan City University, Yiyang, Hunan, China;[Zhang, Honghui] Changsha planning information center, Changsha, Hunan, China;[Shu, Bangrong] Department of Land Resources, School of Geodesy and Geomatics, Jiangsu Normal University, Xuzhou, Jiangsu, China;[Zeng, Yongnian] School of Geoscience and Geomatics, Central South University, Changsha, Hunan, China
关键词：
Land use allocation;Multi-objective optimization;Multi-agent system;Sustainable land use;China
摘要：
Achieving multi-objective land use optimization allocation (MOLUOA) for sustainable development is an important issue in land use. In consideration of the multi-dimensional characteristics of MOLUOA in terms of quantity, space, and time, and under the constraints of maximizing economic, ecological, and social benefits of land use, a MOLUOA model is developed in this study by integrating multi-agent system with particle swarm optimization. The MOLUOA model is applied to the simulation of land use optimization allocation in Changsha, a typical city located in central China. Simulation results show that the MOLUOA model can achieve multi-objective land use optimization allocation in terms of quantity, space, and time. The model can provide decision-making support for generating land use alternatives to achieve sustainable land use. (C) 2015 Elsevier B.V. All rights reserved.
摘要：
Due to its great strategic significance in integrating regional coordinated development and enhancing the rise of Central China, urban agglomeration in the middle reaches of Changjiang (Yangtze) River has attracted much attention from both theoretical and practical aspects. Such research into the area’s economic network structure is beneficial for the formation of an urban- and regional-development strategy. This paper constructs an economic tie model based on a modified gravitation model. Subsequently, referring to social network analysis, the paper empirically studies the network density, network centrality, subgroups and structural holes of the middle reaches of Changjiang River’s urban agglomeration economic network. The findings are fourfold: (1) an economic network of urban agglomeration in the middle reaches of Changjiang River has been formed, and economic ties between the cities in this network are comparatively dense; (2) the urban agglomeration in the middle reaches of Changjiang River can be divided into four significant subgroups, with each subgroup having its own obvious economic communications, while there is less economic-behavioral heterogeneity among subgroups — this is especially true for the two subgroups that exist in the Poyang Lake Ecological Economic Zone; (3) an economy pattern driven by the central cities of Wuhan, Changsha and Nanchang has emerged in the urban agglomeration of the middle reaches of Changjiang River, while these three capital cities have exerted great radiation abilities to their surrounding cities, the latter are less able to absorb resources from the former; (4) the Wuhan Metropolitan Areas and the Poyang Lake Ecological Economic Zone have more structural holes than the Ring of Changsha, Zhuzhou and the Xiangtan City Clusters, meaning that cities at the periphery of these two areas are easily constrained by central cities. The Ring of Changsha, Zhuzhou and the Xiangtan City Clusters have fewer structural holes; thus, the cities in this area will not face as many constraints as those in the other two areas.
期刊：
Frontiers in chemistry,2018年6:80 ISSN：2296-2646
通讯作者：
Liu, YG
作者机构：
[Liu, Shao-bo] School of Metallurgy and Environment, Central South University, Changsha, China;[Liu, Shao-bo] College of Environmental Science and Engineering Research, Central South University of Forestry and Technology, Changsha, China;[Jiang, Lu-hua; Liu, Yun-guo; Yin, Zhi-hong; Zeng, Zhi-wei; Li, Jiang; Tian, Si-rong; Tan, Xiao-fei; Zeng, Guang-ming; Liu, Ni] College of Environmental Science and Engineering, Hunan University, Changsha, China;[Jiang, Lu-hua; Liu, Yun-guo; Yin, Zhi-hong; Zeng, Zhi-wei; Li, Jiang; Tian, Si-rong; Tan, Xiao-fei; Zeng, Guang-ming; Liu, Ni] Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, China;[Zeng, Zhi-wei] College of Architecture and Urban Planning, Hunan City University, Yiyang, China
摘要：
This paper comparatively investigated the removal efficiency and mechanisms of rice straw biochars prepared under three pyrolytic temperatures for two kinds of tetracycline and quinolone antibiotics (doxycycline and ciprofloxacin). The influencing factors of antibiotic adsorption (including biochar dosage, pH, background electrolytes, humic acid, initial antibiotics concentration, contact time, and temperature) were comprehensively studied. The results suggest that biochars produced at high-temperature [i.e., 700 degrees C (BC700)], have higher adsorption capacity for the two antibiotics than low-temperature (i.e., 300-500 degrees C) biochars (BC300 and BC500). Higher surface area gives rise to greater volume of micropores and mesopores, and higher graphitic surfaces of the BC700 contributed to its higher functionality. The maximum adsorption capacity was found to be in the following order: DOX > CIP. The pi-pi EDA interaction and hydrogen bonding might be the predominant adsorption mechanisms. Findings in this study highlight the important roles of high-temperature biochars in controlling the contamination of tetracycline and quinolone antibiotics in the environment.
作者机构：
[Tang, Jia; Deng, Zong-Wei; Tan, Xian-Liang] Planning and Architecture Design and Research Institute, Hunan City University, Yiyang 413000, China;[Li, Zhi-Yong] Hunan Communication Scientific Academy, Changsha 410015, China;[Deng, Zong-Wei] School of Resources and Safty Engineering, Central South University, Changsha 410083, China
作者机构：
[杨庆; 年廷凯; 孔纲强] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;[孔纲强] Key Laboratory of Education Ministry for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;[胡庆春] Architecture and City Planning College, Hunan City University, Yiyang, Hunan 413000, China
作者机构：
[施周; 张骅; 张伟; 徐舜开] College of Civil Engineering, Hunan Univ, Changsha, Hunan 410082, China;[施周; 张骅; 张伟; 徐舜开] Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan Univ, Changsha, Hunan 410082, China;[张伟] Dept of Urban Construction, Hunan City Univ, Yiyang, Hunan 413000, China
作者机构：
[施周; 张骅; 张伟; 张茜; 徐舜开] College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China;[施周; 张骅; 张伟; 张茜; 徐舜开] Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan Univ., Changsha, Hunan 410082, China;[张伟] Dept. of Urban Construction, Hunan City Univ., Yiyang, Hunan 413000, China
