Greening Of Chemistry Experiment in universities

介绍了按照绿色化学要求改进化学实验的必要性和可行性措施,以达到减少有害物质对环境的污染,实现化学实验绿色化的目标.:This papper discussed the necessity and feasible method of reform in some chemistry experiment acco rding to Green chemist ry , so as to reduce the environmental pollution and realize the Greening of chemistry experiment

The Idea of the Reform in Analytic Chemistry Experiment According to Local Resources

结合资源 ,联系分析化学实验教学现状 ,提出了分析化学实验教学的改革计划方案 .主张将分析化学实验课程分为三个层次 :基础分析实验———实际应用型实验———知识创新型实验

High Performance Liquid Chromatographic Investigation of Water Extract of Siraitia grosvenorii

采用超声强化水提取法进行样品前处理,用高效液相色谱(HPLC)法对罗汉果水提取物进行分离,用罗汉果苷Ⅴ作为参照物进行指标成分峰的定位,以建立全面评价罗汉果质量的方法。实验比较了水-甲醇、冰乙酸水溶液-甲醇、磷酸水溶液-甲酸、水-乙腈、磷酸水溶液-乙腈、三氟乙酸水溶液-乙腈6种体系的等度、梯度洗脱效果。结果表明:在上述6种流动相体系中,以三氟乙酸水溶液-乙腈的洗脱效果最好,色谱条件:梯度洗脱、Sinochrom ODS-BP柱、检测波长为205 nm,流速0.8 mL/min,柱温25℃。采用本法得到的分离度和重现性均较好。The water extract of Siraitia grosvenorii was analyzed by HPLC with ultrasonic enhanced extraction and using mogroside V as reference. The effects of different mobile phases e. g. H2O-methanol, acetic acidmethanol, phosphoric acid-formic acid, H2O-acetonitrile, phosphoric acid-acetonitrile and trifluroacetic acidacetonitrile, their concentration and gradient elution conditions on the HPLC separation were investigated. The results showed that the optimal HPLC analysis conditions are： Sinochrom ODS column with oven at 25℃; trifluroacetic acid-acetonitrile as mobile phase with flow rate at 0.8 mL/min; gradient elution with detection at 205 nm. Good separation and reproducibility have been obtained by the proposed method.广西教育厅自筹资金(2003

比重瓶法测颜／填料真密度脱气方法的改进

目前我国颜料、填料真密度值测定普遍执行 GB1713-1989比重瓶法标准。在工业生产检测时,常以蒸馏水或煤油为液体介质,与之相应的除气法有煮沸法和真空法。为了达到良好的脱气效果, 前者需将比重瓶置于50 g·L-1氯化钠溶液中煮沸 2 h,耗时较长,如果比重瓶内温度低于100℃时广西科技厅青年基金项目[桂科青 0339012

Recovery utilization of waste catalysts from vinyl acetate production

采用正交实验研究了微波、超声波条件对废触媒解吸效果的影响,对比实验结果表明,1次微波2次超声波联用技术锌的洗脱率较高,回收的活性炭超过了林业局粉状活性炭二级品指标。用洗脱的醋酸锌溶液制备的磷酸锌符合防锈颜料要求。最终的废液采用电石废渣中和后达到国家废水处理三级排放标准。实现了废触媒的综合回收利用。 The effect of both microwave and ultrasound conditions on desorption of waste catalysts was investigated by orthogonal experiment. Comparison of data revealed that combined action of once microwave and twice ultrasound had a higher zinc extraction, and its decolorization efficiency of regenerated active charcoal to methylene blue was over the second grade of the Forestry Department of China . Zinc phosphate prepared from zinc acetate via desorption waste catalyst in product of vinyl acetate was qualified for the anticorrosive pigment. The waste calcium carbide was applied in the treatment of wastewater, which made discharged water reach the third grade standard of GB. All the results show that multipurpose recovery utilization of waste catalysts can be realized.广西民族学院“挑战杯”大学生科技创新项

The Role of Surfactant in Preparation of Microcrystalline Zinc Phosphate

通过测定表面张力γg L、润湿角θ,计算润湿吉布斯自由焓ΔG,确定选用活性剂的种类,同时测定加入非离子表面活性剂的醋酸锌溶液的表面张力,并结合磷酸锌对OP 10吸附量Г,推测OP 10在微晶磷酸锌制备中的作用机理。结果表明:非离子表面活性剂OP 10可降低醋酸锌溶液的表面张力,形成临界胶束,在新生成的磷酸锌表面产生S型吸附,形成空间位阻效应,从而阻止磷酸锌粒子的聚集,控制磷酸锌颗粒尺寸。[ Abstract] 　To select the suitable surfactant ,wetting Gibbs free energy change ΔG were calculated by the measurement for surface tensionγg-L and wetting anglesθof Zinc phosphate with different surfactants .According to the measured values for surface tension of zinc acetate solution having non-ionic surfactant and the corresponding adsorption of OP-10 on Zinc Phosphate , the action mechanism of OP-10 in preparation of microcrystalline Zinc Phosphate was inferred .The results show that the non-ionic surfactant can reduce the surface tension of zinc acetate aqueous solution to form critical micelle and produce S-style absorption on the surface of original zinc phosphate to form the sterically hindered effect ,which are helpful to preventing particle agglomeration and diminishing the size of zinc phosphate .广西科技厅青年基金项目(桂科青0339012);广西教育厅项目(2003);广西民族学院重点项目(2003

Low cost process for zinc phosphate anticorrosive pigment

采用氨 -碳铵溶液净化低度氧化锌生产磷酸锌的新工艺 ,克服了直接法固 -液反应的弊病 ,较明显地降低了原料成本。广西民族学院青年基金项

无机化学实验教学改革的探讨

本文简要分析了无机化学实验教学存在的问题,提出了通过提高认识,改编实验教材,改进教学方法,实施实验室开放,引进现代化教学手段等无机化学实验教学教草的探讨

纳米结构In2O3八面体的碳还原法合成

>准一维氧化物纳米材料因其特殊的光学性能、电学性能及空间几何结构而广受关注,到现在为止已经制备出多种准一维二元氧化物纳米结构,例如ZnO,SnO2,Ga2O3,In2O3,SiO2,MgO,Al2O3 等。这类材料的制备方法也是多种多样,主要有激光烧蚀法(Laser ablation method)、气相蒸发法 (Vapor-phase evaporation)、模板法(Template-ba广西科学自然基金资助项目(桂科基0575030)广西科技攻关资助项目(桂科攻0155015

MnO2纳米结构的常温液相催化合成

具有一维纳米结构和球型纳米结构的材料因有着比普通块体材料更为丰富的物理和化学特性, 冈而有着更加广泛的实际应用。一维纳米结构具有优良的化学、光学、热稳定及机械性能,因此可用作未来微型仪器的构建基元;纳米球型结构在催化、药物传输、光电子材料、化学或生物传感器等方面有着广泛的应用。通过VLS机理的多相催化方法常被用来合成一维纳米结构,生成物在催化剂表面过饱和而生长成一维纳米材料。广西科学自然基金资助项目(桂科基0575030)广西科技攻关资助项目(桂科攻0155015