铬渣中Cr（Ⅵ）的浸出及强化研究

采用ICP-OES,XRD,SEM,EDX和电导率在线监测等手段分析铬渣浸取前后的变化及各种元素浸出量随pH值的变化,考察了添加化学悬浮剂、浸取体系和超声处理对铬渣中Cr（Ⅵ）浸出行为的强化作用.结果表明,浸取过程基本不改变铬渣的结构;pH为5-7,使用合适的浸取介质有利于Cr（Ⅵ）的溶出,通过添加化学悬浮剂APG650可提高浸取效率3倍,超声处理可提高浸取效率70多倍

铬渣中Cr（Ⅵ）的浸出及强化研究

采用ICP-OES,XRD,SEM,EDX和电导率在线监测等手段分析铬渣浸取前后的变化及各种元素浸出量随pH值的变化,考察了添加化学悬浮剂、浸取体系和超声处理对铬渣中Cr（Ⅵ）浸出行为的强化作用.结果表明,浸取过程基本不改变铬渣的结构;pH为5-7,使用合适的浸取介质有利于Cr（Ⅵ）的溶出,通过添加化学悬浮剂APG650可提高浸取效率3倍,超声处理可提高浸取效率70多倍

铬渣中Cr(Ⅵ)的浸出及强化研究

采用ICP-OES,XRD,SEM,EDX和电导率在线监测等手段分析铬渣浸取前后的变化及各种元素浸出量随pH值的变化,考察了添加化学悬浮剂、浸取体系和超声处理对铬渣中Cr（Ⅵ）浸出行为的强化作用.结果表明,浸取过程基本不改变铬渣的结构;pH为5-7,使用合适的浸取介质有利于Cr（Ⅵ）的溶出,通过添加化学悬浮剂APG650可提高浸取效率3倍,超声处理可提高浸取效率70多倍

铬渣中Cr(Ⅵ)的浸出及强化研究

采用ICP-OES,XRD,SEM,EDX和电导率在线监测等手段分析铬渣浸取前后的变化及各种元素浸出量随pH值的变化,考察了添加化学悬浮剂、浸取体系和超声处理对铬渣中Cr(Ⅵ)浸出行为的强化作用.结果表明,浸取过程基本不改变铬渣的结构;pH为5—7,使用合适的浸取介质有利于Cr(Ⅵ)的溶出,通过添加化学悬浮剂APG650可提高浸取效率3倍,超声处理可提高浸取效率70多倍

Research on high-speed optical receiver with integrated large photosensitive surface photodetector based on standard CMOS process

为提高大纤芯(1 MM)塑料(POf)光纤通信用的单片集成光接收机(OEIC)的速率并降低成本,对SI基大光敏面光电探测器(Pd)的结构、性能以及后续放大电路进行了研究。首先,基于标准CMOS工艺流程对n+/n-WEll/P-Sub Pd结构进行建模和优化设计,对其光谱响应曲线和频率特性曲线进行了仿真;其次,建立Pd等效电路模型,结合设计的后续放大电路进行协同设计与仿真;最后,采用0.5μM CMOS工艺对单个面积为200μMx200μM的Pd以及后续放大电路单片集成电路进行了流片、封装和测试。实验结果表明,在-2.5V偏压下和650nM波长入射光,n+/nWEll/P-Sub Pd的响应度约有0.12 A/W,暗电流约为-9PA;单片光接收机在小于10-9的误码率bEr条件下,灵敏度为-23dbM,并得到250 MbIT/S速率的清晰眼图。In order to improve the speed and lower the cost of the monolithic integrated optical receiver for large core(1mm)plastic optical fiber(Pof)communication,the structure and performance of large photosensitive surface photodetector(PD)and subsequent amplifying circuit based on silicon are investigated.Firstly,based on the standard CMOS process,the model of N+/N-well/P-sub PDs structure is established and optimized.The PD′s characteristics of optical spectral responsivity and frequency response are simulated.Then,the collaborative design and simulation are accomplished through combining the established PD′s equivalent circuit model with the designed subsequent amplifying circuit.Finally,by using the 0.5μm CMOS process,the single PD with size of 200μm×200μm,and the monolithic integrated circuit of PD and post amplifiers are packaged and tested,respectively.The tested results indicate that at the wavelength of 650 nm,the responsivity of N+/N-well/p-sub PD is 0.12A/W,the dark current is about 9pA,under the bias voltage of-2.5V.The sensitivity of the monolithic integrated opticalreceiver is-23 dBm under the bit-error-rate(BER)of 10-9.And a clear eye-diagram with the speed of250Mbit/s is achieved.The designed monolithic integrated optical receiver can be applied to 250Mbit/s optical fiber communication systems very well.国家自然科学基金(61205060);国家自然科学基金青年基金(61401101); 东南大学毫米波国家重点实验室开放基金(K201401); 安徽省自然科学基金(1408085QF122); 安徽高校省级自然科学研究(2014KJ022); 福建省科技计划重点(2013H0047); 阜阳师范学院博士科研启动基金(FSB201501002); 阜阳师范学院科技成果孵化基金(2013KJFH05)和资助项

Silicon Silver Composite Materials for Li-ion Batteries

应用机械合金化法制备了两种不同组分的Si-Ag复合材料.扫描电镜(SEM)、X射线衍射(XRD)、充放电测试和循环伏安法对该材料的微观形貌、相组成及电化学性能.研究表明,组成原子比为1∶1的复合材料具有很好的循环稳定性和可逆性,在0.2mA·cm-2的电流密度下,经50周循环后可逆容量仍保持300mAh·g-1.实验发现,借助充放电控制,即可有效提高合金材料的循环性能.Si-Ag composite materials were prepared by mechanical alloying method. The morphology and composition of SiAg composites were investigated by SEM and XRD. The electrochemical properties of the composites were determined by charge-discharge tests and cyclic voltammetry. The composite composed of Si∶Ag with an atomic ratio of 1∶1 (sample 1#) showed good cyclic stability and charge-discharge reversibility. The reversible capacity of the composite (sample 1#) was remained over 300 mAh·g-1 after 50 cycles. Experimental results showed that controlling the potential range of charge-discharge processes could enhance the cyclic performance of alloy materials.作者联系地址：浙江工业大学化学工程与材料学院,绿色化学合成技术国家重点实验室培育基地;Author's Address: State Key Lab Breeding Base of Green Chemistry-Synthesis Techology,College of Chemical Engineeringand Materials Science,Zhejiang Univ. Tech.,Hangzhou 310014,Chin

Effect of organic-inorganic composite binding materials on steel structure fire retardant coating

[中文文摘]以硅酸盐类凝胶材料为主粘接剂,采用有机无机复合方法,通过聚合物和改性水玻璃对主粘接剂进行改性,使涂层兼具水泥的刚性和聚合物的柔性,提高其粘结性、耐水性和柔韧性,克服涂层高温或骤冷条件下易爆裂、脱落,常温下易粉化、受潮、附着力差等缺点;理化性能测试和高温燃烧实验表明,防火涂层具有优良的耐火性能,与基材粘接性能良好。[英文文摘]In the steel structure fire-retardant coating silicate gel materials is as primary binder,which is modified by polymer and modified sodium silicate using organic-inorganic compound method.After modification,the coating possesses stiffness of cement and flexibility of polymer at the same time.The adhesive strength of coating increases as well as resistivity against water and flexibility.The coating is not easy to burst or scale off under high temperature or shock cooling condition.It is also hard to be chalked,wetted under room temperature condition. The physicochemical properties testing and combustion experiments prove that modified fire-ret ardant coating has good fireproof performance, and high adhesive strength to protected backing .福建省科技重点项目(2007T0013,2006I0026); 厦门市科技计划项目(3502Z20073006