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Fabrication of magnetic multi-template molecularly imprinted polymer composite for the selective and efficient removal of tetracyclines from water

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 339-350页

作者： Guolong Zeng Yiyang Liu xiaoguo ma Yinming Fan School of Environmental Science and Engineering Guangdong University of TechnologyGuangzhou510006China

Antibiotic contamination of the water environment has attracted much attention from researchers because of their potential hazards to humans and *** this study,a multi-template molecularly imprinted polymer(MIP)modified mesoporous silica coated magnetic graphene oxide(MGO@MS@MIP)was prepared by the surface imprinting method via a sol-gel process and was used for the selective,efficient and simultaneous removal of tetracyclines(TCs),including doxycycline(DC),tetracycline(TC),chlorotetracycline(CTC)and oxytetracycline(OTC)from *** synthesized MIP composite was characterized by Fourier transform infrared spectroscopy,transmission electron microscope and thermogravimetric *** adsorption properties of MGO@MS@MIP for these TCs were characterized through adsorption kinetics,isotherms and selectivity *** MIP composite revealed larger adsorption quantities,excellent selectivity and rapid kinetics for these four *** adsorption process was spontaneous and endothermic and followed the Freundlich isotherm model and the pseudo-second-order kinetic *** MGO@MS@MIP could specifically recognize DC,TC,CTC and OTC in the presence of some chemical *** addition,the sorption capacity of the MIP composite did not decrease significantly after repeated application for at least five ***,the prepared magnetic MIP composite has great potential to contribute to the effective separation and removal of tetracyclines from water.

关键词： Tetracyclines Removal Adsorption Molecularly imprinted polymer magnetic graphene oxide

Analysis of trace mercury in water by solid phase extraction using dithizone modified nanometer titanium dioxide and cold vapor atomic absorption spectrometry

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Rare Metals 2007年第6期26卷 541-546页

作者： ma xiaoguo HUANG Bei CHENG Meiqing Faculty of Environmental Science and Engineering Guangdong University of Technology Guangzhou 510090 China Department of Chemical Engineering Maoming University Maoming 525000 China

A new method for analysis of trace mercury in water samples was developed, based on the combination of preconcentration/separation using dithizone-modified nanometer titanium dioxide （TiO2） as a solid phase extractant and determination by cold vapor atomic adsorption spectrometry （CVAAS）. Dithizone was dissolved with alcohol and loaded on the surface of nano-sized TiO2 powders by stirring. The static adsorption behavior of Hg^2＋on the dithizone-modified nanoparficles was investigated in detail. It was found that excellent adsorption ratio for Hg^2＋ could be obtained in the pH range of 7-8 with an oscillation time of 15 rain, and a 5 mL of 3.5 mol·L^-1 HCI solution could quantitatively elute Hg^2＋ from nanometer TiO2 powder. Common coexisting ions caused no obvious influence on the determination of mercury. The mechanisms for the adsorption and desorption were discussed. The detection limit （30） for Hg^2＋ was calculated to be 5 ng·L^-1. The proposed method was applied to the determination of Hg^2＋ in a mineral water sample and a Zhujiang River water sample. By the standard addition method, the average recoveries were found to be 94.4%-108.3% with RSD （n = 5） of 2.9%-3.5%.

关键词： analytical chemistry mercury solid-phase extraction TiO2 nanoparticle cold vapor atomic adsorption spectrometry (CVAAS)

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基于响应面法的机载光电集成箱优化设计

机械 2024年第1期51卷 17-23页

作者：陶冶农王亮苏润石李克凯马晓国四川大学机械工程学院四川成都610065

机载光电集成箱在战斗机飞行过程中面临振动、冲击等恶劣工作环境。本文旨在提高光电集成箱抗振动干扰能力和结构可靠性,以减少最大变形量和提升结构一阶模态频率为目标,对光电集成箱进行多目标优化设计。根据加速度过载极端条件对原始... 详细信息

机载光电集成箱在战斗机飞行过程中面临振动、冲击等恶劣工作环境。本文旨在提高光电集成箱抗振动干扰能力和结构可靠性,以减少最大变形量和提升结构一阶模态频率为目标,对光电集成箱进行多目标优化设计。根据加速度过载极端条件对原始光电集成箱三维模型进行特定载荷下的静力分析和普通约束条件下的模态分析;采用最佳空间填充设计法(OSFD)法进行实验设计,提取结构设计参数并建立样本空间,响应面模型运用Kriging法进行构建;以最小化结构变形量、提升结构第一阶模态频率作为优化目标,以结构等效应力和质量为约束条件,运用MOGA遗传算法对构建响应面模型进行了优化求解,得到响应面模型最优解,最后对模型进行参数化重构和验证。优化结果显示:经过优化后的光电集成箱,最大变形量减少了44.02%,基频提高了33.6%,质量减少了8%,有效地提升了光电集成箱的动力学性能和可靠性。

关键词：最佳空间填充设计法 Kriging法多目标遗传算法响应面优化

Simultaneous determination of some trace metal impurities in high-purity sodium tungstate using coprecipitation and inductively coupled plasma atomic emission spectrometry

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Rare Metals 2004年第3期23卷 193-196页

作者： maxiaoguo KUANGTongchun LIUQianjun CenterofAnalysisandTesting GuangdongUniversityofTechnologyGuangzhou510090China

A method based on the combination of coprecipitation with inductively coupledplasma atomic emission spectrometry (ICP-AES) was developed for the determination of impurities inhigh-purity sodium tungstate. Six elements (Co, Cu, Fe, Mn, Ni, and Pb) were coprecipitated bylanthanum hydroxide so as to be concentrated and separated from the tungsten matrix. Effects of somefactors on the recoveries of the analytes and on the residual amount of sodium tungstate wereinvestigated, and the optimum conditions for the coprecipitation were proposed. matrix-matchingcalibration curve method was used for the analysis. It is shown that the elements mentioned abovecan be quantitatively recovered. The detection limits for Co, Cu, Fe, Mn, Ni, and Pb are 0.07, 0.4,0.2, 0.1, 0.6, and 1.3 μg·g^(-1), respectively. The recoveries vary from 92.5% to 108%, and therelative standard deviations (RSDs) are in the range of 3.1%-5.5%.

关键词： analytical chemistry trace metal determination inductively coupled plasmaatomic emission spectrometry (ICP-AES) coprecipitation sodium tungstate

The Unascertained Comprehensive Evaluation on Rationalization of Regional Industrial Structure

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Journal of Systems Science and Information 2006年第3期4卷 609-620页

作者： xiaoguo ma Fengqiu Du Kaidi Liu Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Hebei University of Engineering Handan 056038 China

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铜离子印迹聚合物的吸附性能研究

分析试验室 2022年第1期41卷 85-89页

作者：彭雨琦马晓国王颖张恒源刘怡杨广东工业大学环境科学与工程学院广州510006

以二苯氨基脲为功能单体,合成了铜离子印迹聚合物(Cu^(2+)-IIPs),并用于Cu^(2+)的快速吸附检测。对Cu^(2+)-IIPs进行了表征,考察了其对Cu^(2+)的吸附特性。结果表明,Cu^(2+)-IIPs为球型状颗粒且粒径分布均匀,印迹位点位于表面及空穴中,... 详细信息

以二苯氨基脲为功能单体,合成了铜离子印迹聚合物(Cu^(2+)-IIPs),并用于Cu^(2+)的快速吸附检测。对Cu^(2+)-IIPs进行了表征,考察了其对Cu^(2+)的吸附特性。结果表明,Cu^(2+)-IIPs为球型状颗粒且粒径分布均匀,印迹位点位于表面及空穴中,对Cu^(2+)的吸附过程符合准二级动力学模型,吸附速率受表面吸附和内部扩散共同影响。较之Langmuir模型和Tempkin模型,Freundlich模型能更好地拟合吸附等温线,说明属于多层吸附;ΔG^(0),ΔH^(0)和ΔS^(0)的数据显示,吸附是一个自发进行的、吸热的、熵增大的过程;Cu^(2+)-IIPs对Cu^(2+)的吸附量远大于具有相似结构和性质的其它重金属离子,因而具有良好的吸附选择性。

关键词：铜离子离子印迹聚合物吸附特性