薄金属带材连续高速电镀异型阳极

为了提高金属带材连续高速电镀的速度、质量和降低能耗,控制金属电沉积的电流密度和阳极形状是关键.考虑到金属带材高速电镀时传输的电流大,在镀区内的金属带材不是等电势体,导致金属电沉积的电流密度分布不均匀.为此,建立了恒定电流密度电镀的数学模型,推导出异型阳极形状的计算公式,为金属带材连续高速电镀的电流密度控制提供了理论依据.     

二氧化钛光催化剂的中毒机理及再生技术分析

光催化剂的中毒已经成为限制光催化技术进一步发展的主要因素.对气-固光催化技术和液-固光催化技术中光催化剂失活机制进行了分析,对光催化剂的活性分析技术进行了介绍,并总结了国内外关于TiO2光催化剂中毒再生技术的研究成果,为光催化技术在实际应用中遇到的中毒及再生问题提供了参考.最后,对光催化剂失活的研究进行了展望.     

Synthesis and characterization on semi-aromatic polyamide containing benzoxazole unit

In order to obtain a novel polyamide having excellent heat-resistant properties which could be anticipated as a thermal modifier for aliphatic polyamide,a series of new semi-aromatic polyamides (BO6,BO8,BO10) containing benzoxazole unit were synthesized based on 5-amino-2-(p-aminophenyl) benzoxazole (ABO) and aliphatic acids (adipic,suberic and sebacic acid) by means of Yamazaki phosphorylation method.The effect of reaction temperature on the inherent viscosity of the polymers was studied,and the structures of products were characterized by FTIR,1 H-NMR,and the heat resistance of the polymers was studied by DSC and TG.The results showed that the reaction temperature gives the polymers the highest viscosity at around 90 ℃,130 ℃ and 130 ℃ for BO6,BO8 and BO10,respectively.The heat resistance of the new semi-aromatic polyamides is much higher than that of the common aliphatic polyamides.In addition,the products show good solvent resistance and crystallization properties.     

Determination of hydroxyl radical in organic wastewater treatment by electrochemical oxidation

A method of detection hydroxyl radical （ · OH） produced by electrochemical oxidation in organic wastewater treatment was developed. Benzoic acid with weak fluorescence may reacted with hydroxyl radical to produce 3-hydroxybenzonic acid with intense fluorescence, whose characteristic fluorescence excitation and e- mission wavelength were at 305 nm and 410 nm. The 3-hydroxybenzonic acid was separated from electroehenaical oxidation system by HPLC. Two major hydroxylated products were quantified corresponding to 3-hydroxybenzonic, 4-hydroxybenzonic acid. Therefore the quantity of hydroxyl radical in the reactive system should be primarily calculated. The optimal experimental program was obtained by studying the determination conditions, which were benzoic acid of 1.0 mmol/L, electrolysis time of 60 min, current density of 39 mA/cm^2 , supporting electrolyte （Na2SO4 ） of 0. 02 mol/L, and the low rate of sparged-air of 25 mL/s. The results show that this method is stable, sinaple and rapid and can be used as a convenient method for the determination of hydroxyl radical.     

使用改进活性表面液膜萃取铜的机理研究

The liquid surfactant membrane(LSM)systems consist of three phases.Twomiscible phases which feed and strip solute respectively are separated from each otherby a third organic membrane phase that is immiscible with both.The technique ofLSM has received considerable attention for its high surface area to volume ratio,     

线切割工作液的润湿与清洗作用对切割速度的影响

本文分析了线切割工作液的润湿和清洗作用与表面张力,界面张力及润湿接触角之间的影响关系,并且提出用界面张力来判断线切割工作液的润湿和清洗性能要好于使用表面张力和润湿接触角。     

纳米粒子TiO2/Ti膜的制备及其光催化活性

以钛酸四丁酯为原料，利用溶胶－凝胶方法制备了纳米粒子TiO2/Ti膜。TG－DTA、XRD、TEM和SEM的测试表明：纳米粒子经历了无定型向锐钛矿和锐钛矿向金红石相转变两个过程，而焙烧温度为600℃时，TiO2纳米粒子具有与国际商品P－25型TiO2粒子相类似的组成、结构、形貌和粒子尺寸。考虑TiO2粒子性质及与基体Ti片的结合能力，焙烧温度对基体Ti片的影响和纳米粒子TiO2/Ti膜表面形貌等因素，确定600℃是制备纳米粒子TiO2/Ti膜光催化剂的最合适的焙烧温度。另外，以光催化降解苯酚为模型反应，考察了焙烧温度对纳米粒子TiO2/Ti膜催化活性的影响，并初步地探讨了光催化降解苯酚反应的动力学。结果表明，600℃焙烧的TiO2纳米粒子膜具有最高的光催化活性，而光催化降解反应为准一级动力学反应。     

高效有机吸附膜数学模型的建立及应用

采用自行合成的有机吸附膜富集净化水中微量有机污染物,依据有机吸附膜对水中有机污染物物理吸附的过程,在大量测试数据基础上建立高效有机吸附膜吸附饮用水中氯仿的数学模型,并用统计方法求取了模型中的参数.应用此模型研究了萃取时间、水样中氯仿的本底质量浓度和高效有机吸附膜厚度等对萃取效率的影响.通过有机吸附膜对模拟饮用水中氯仿的吸附实验,证明该模型能较准确地模拟高效有机吸附膜吸附氯仿的过程,模型计算数据与实验数据吻合较好.     

基于高级氧化技术处理乙烯生产废碱液的研究

研究了UV／H2O2，UV／O3和UV／H2O2／O3三种高级氧化体系处理乙烯装置所排放废碱液的特点。对于UV／H2O2体系，随着H2O2剂量的增加，COD的去除率以及处理液的可生化性(BOD：COD值)都随之增大，其性能也好于单独的H2O2体系，该体系在最佳条件下，COD的去除率达到68％，BOD／COD值从0．22增大到0．52；对于UV／O3体系，随着O3剂量的增加，COD的去除率及处理液的可生化性(BOD：COD值)也都随之增大，其性能也好于单独的O3体系。该体系在最佳条件下，COD的去除率达到54％，可生化性(BOD／COD值)从0．22增大到0．48；对于UV／H2O2／O3体系，其COD去除率比UV／O3体系高出22．0％。     

基于现代人工耦合技术的流域水资源监控系统

在分析我国流域水环境监测现状的基础上，针对监测系统具有的污染点分散、水质数据频繁传递、追查和回传的特点，将基于人工神经元网络的虚拟仪表技术和单芯片以太网协议栈、电力线载波通讯等多种获取技术应用于水资源参数的在线监控，研究了具有真正在线连续检测功能的适用于流域水资源监控的管理系统．通过将最新的人工耦合技术应用干水资源监测，为环境工程学科建设提供新的技术支撑，有利于实现流域水资源管理的自动化、信息化、网络化．