离子膜电解工艺

离子膜法制烧碱是当今氯碱工业最新制碱技术。离子膜电解槽制出的液碱,浓度高、质量高、质量优、能耗少、无公害、无石棉绒污染、投资省,因此离子膜法制烧碱工艺已成为世界氯碱工业的发展方向。     

工业废水中微量碘离子的分析方法研究

对碘离子的分析方法进行总结,同时采用碘离子选择性电极测定工业废水中碘离子含量,且对氯化钾、硫酸钾的存在对碘离子测定的影响进行了探讨。     

试剂氯化钠中微量溴的离子色谱法测定

用离子色谱仪可以直接测定氯化钠中的微摄溴。操作简单快速,方法灵敏准确。一、实验部分1.仪器与试剂:Dionex 2020 i 离子色谱仪,电流检定器(银工作电极)淋洗溶液:0.2 MNa_2CO_3,用优级纯试剂配制,使用时稀释100倍。溴标准溶液:配制成1.000毫克/毫升的     

ZIF-67与ZIF-8对水溶液中碘离子吸附性能研究

以Co(NO_3)_2、Zn(NO_3)_2、2-甲基咪唑和甲醇为原料制备出两种金属骨架结构材料ZIF-67和ZIF-8,并以该两种材料对碘离子进行了吸附实验,探究了溶液pH值、吸附时间、温度等因素对两种材料吸附溶液中碘离子的吸附效果及其影响。结果表明,两种材料对碘离子均在pH为7的水溶液体系中达到最大吸附量,在18 h左右达到吸附动态平衡。拟合结果表明,ZIF-67对碘离子的吸附符合Langmuir吸附等温线,ZIF-8对碘离子的吸附更符合Freundlich吸附等温线。最大吸附量分别为141.81 mg/g和474.02 mg/g。两种材料对碘离子的吸附行为更符合准一级动力学模型,吸附类型属于单分子层吸附。     

ZIF-67与ZIF-8对水溶液中碘离子吸附性能研究

以Co(NO3)2、Zn(NO3)2、2-甲基咪唑和甲醇为原料制备出两种金属骨架结构材料ZIF-67和ZIF-8,并以该两种材料对碘离子进行了吸附实验,探究了溶液pH值、吸附时间、温度等因素对两种材料吸附溶液中碘离子的吸附效果及其影响.结果表明,两种材料对碘离子均在pH为7的水溶液体系中达到最大吸附量,在18 h左右达...     

离子膜烧碱生产中盐水脱碘新技术的研究

探讨了对离子膜烧碱生产电解用盐水的除碘新技术,该技术能降低碘对离子膜的负面影响,延长使用寿命。     

碳纳米管吸附去除水溶液中锌离子的性能

研究了碳纳米管对水溶液中锌离子的吸附去除性能.结果表明:纯化的碳纳米管对锌离子的去除效果明显高于未纯化的碳纳米管,在25 mL、50 mg/L的锌离子溶液中当其用量为0.1 g时,纯化的碳纳米管锌离子的吸附去除率达94.8%;吸附60 min达到平衡;在中性和弱碱性溶液中的去除率大于酸性溶液.     

醋酸中微量碘离子的脱除方法研究

考察了在醋酸精馏过程中分别加入醋酸钾和硝酸银溶液脱除碘离子的效果,结果表明两种溶液均具有高效脱碘能力,当醋酸钾与原料液中碘离子的质量比大于10、AgNO3与碘离子的摩尔比大于化学计量比即可将碘离子脱除至很低的含量(10×10-9)。     

碘电极测定饮用水中的碘和碘离子

应用碘电极 ,采用亚砷酸钠为碘的还原剂进行前处理 ,选用磷酸二氢钠为总离子强度缓冲液 ,测定了总碘及碘离子含量。建立的方法对三碘树脂净水器净化后的水进行了测定 ,结果良好。当总碘和碘离子的浓度在 10 -7～ 10 -4范围内时 ,相关系数为 0 .9999,回收率大于 98.1%。由实验测定的电位选择系数可见 ,该法选择性好 ,检测下限低。     

Ion-imprinted silica gel and its dynamic membrane for nickel ion removal from wastewaters

An ion-imprinted sorbent (IIP) was prepared by using Ni²⁺ as template, 3-[2-(2-aminoethylamino) ethylamino] propyl-trimethoxysilane as functional monomer, and silica gel as carrier. The adsorption performance of IIP towards Ni²⁺ was investigated. IIP showed a higher adsorption capacity than that of non-imprinted sorbent, and it also exhibited high selectivity for Ni²⁺ in the presence of Cu²⁺ and Zn²⁺ ions. Then, IIP was used to form a dynamic membrane onto the surface of ceramic membrane for treatment of electroplating wastewater containing Ni²⁺. Compared with ceramic membrane, IIP dynamic membrane had much higher steady membrane flux, and also rejected Ni²⁺ to obtain a lower concentration of Ni²⁺ in the permeate fluid. Perhaps it is suitable for future practice applications.     

电导检测离子色谱法测定水和废水中碘化物

建立了一种电导检测一离子色谱法测定水和废水中碘化物的方法,并对色谱条件进行优化。采用IonPacASl9型阴离子分离柱,以40mmol·L-KOH为淋洗液,流速1．0mL·min-1,抑制型电导检测碘化物。碘化物的检出限为0．001mg·L-1,线性范围广,相关性好（r〉0．999）,相对标准偏差为0．3％-2．0％,加标回收率为91．3％～94．4％。该方法操作简单快捷,分离效果好,灵敏度高,适用于水和废水中碘化物的测定。     

离子膜法烧碱电解系统中螯合树脂塔的模块

阐述了离子膜法烧碱系统中螯合树脂塔的工艺设计和生产中已出现和可能出现的问题,并介绍了解决问题的方法。     

直接进样离子色谱法测定食用碱中痕量无机阴离子

用Dionex ICS-1000离子色谱仪,Dionex AS14阴离子分离柱,以3.5 mmol/L碳酸钠-1.0 mmol/L 碳酸氢钠为淋洗液,直接进样分析食用碱中的痕量无机阴离子。该法无需样品前处理,直接进样,电导检测,高浓度碳酸钠的存在不影响痕量阴离子的测定。所测的无机阴离子的检出限均在0.012 6 mg/L以下,线性相关系数为0.998 5～0.999 8,相对标准偏差为1.153%～3.218%(n=5),回收率为93.77%～ 96.00%,符合分析测定要求。     

Small-molecule inhibitors of sodium iodide symporter function

The Na(+)/I(-) symporter (NIS) mediates iodide uptake into thyroid follicular cells. Although NIS has been cloned and thoroughly studied at the molecular level, the biochemical processes involved in post-translational regulation of NIS are still unknown. The purpose of this study was to identify and characterize inhibitors of NIS function. These small organic molecules represent a starting point in the identification of pharmacological tools for the characterization of NIS trafficking and activation mechanisms. The screening of a collection of 17,020 druglike compounds revealed new chemical inhibitors with potencies down to 40 nM. Fluorescence measurement of membrane potential indicates that these inhibitors do not act by disrupting the sodium gradient. They allow immediate and total iodide discharge from preloaded cells in accord with a specific modification of NIS activity, probably through distinct mechanisms.     

淡盐水脱氯及盐水精制工艺改进

在离子膜法电解淡盐水脱氯系统取消加亚硫酸钠,保留一定量的游离氯用于在一次盐水精制中去除粗盐水中的有机物和菌藻类,进而取消加次氯酸钠。介绍了工艺改进方案、改进难点和取得的效果。     

沉淀法去除废水中氯离子

研究沉淀法去除含氯废水中的Cl-。选用CaO和NaAlO2作为处理剂,处理模拟含氯废水,并研究工艺参数的影响。实验结果表明:CaO/NaAlO2=5∶2、温度35℃、溶液初始p H值为10,搅拌反应2hCl-去除率最高。该条件下,二次除氯后Cl-浓度从2847.86mg·L-1降低到254.93mg·L-1,去除率为93.12%。     

Enhanced iodide sequestration by 3-biphenyl-5,6-dihydroimidazo[2,1-b]thiazole in sodium/iodide symporter (NIS)-expressing cells

The ability of the sodium/iodide symporter (NIS) to take up iodide has long provided the basis for cytoreductive gene therapy and cancer treatment with radioiodide. One of the major limitations of this approach is that radioiodide retention in NIS-expressing cells is not sufficient for their destruction. We identified and characterized a small organic molecule capable of increasing iodide retention in HEK293 cells permanently transfected with human NIS cDNA (hNIS-HEK293) and in the rat thyroid-derived cell line FRTL-5. In the presence of 3-biphenyl-4'-yl-5,6-dihydroimidazo[2,1-b]thiazole (ISA1), the transmembrane iodide concentration gradient was increased up to 4.5-fold. Our experiments indicate that the imidazothiazole derivative acts either by inhibiting anion efflux mechanisms, or by promoting the relocation of iodide into subcellular compartments. This new compound is not only an attractive chemical tool to investigate the mechanisms of iodide flux at the cellular level, but also opens promising perspectives in the treatment of cancer after NIS gene transfer.