液相沉淀法制备纳米硫化锌的研究

介绍了利用液相沉淀法制备纳米硫化锌的方法。其过程是以硫酸锌和硫化铵为原料，加入表面活性剂1631，经过沉淀、过滤、洗涤、干燥，最后得到产品。对其进行比表面积、孔容积和透射电镜（TEM）测定，结果表明：制备的硫化锌晶粒尺寸在5—30nm，并最终确定了最佳的原料配比，即硫酸锌与硫化铵物质的量比为1：（1-0．8）。     

高效除铜剂的制备

本文介绍用ＫＭｎＯ４提纯硫酸锌，并与精制的硫化钠反应，制备高效除铜剂硫化锌的工艺。     

过氧化氢在硫酸锌和立德粉生产中使用的可行性研究

一、概述立德粉的制取是由硫酸锌和硫化钡的水溶液进行复分解反应,生成硫化锌和硫酸钡的共沉淀物,再加工处理得到标准立德粉颜料。因此,硫酸锌和立德粉的制取都要首先制备纯净的疏酸锌水溶液。一般常用冶炼氧化锌、氢氧化锌或其他易溶于酸的含锌物质作原料。这些物质溶于硫酸即得粗制硫酸锌溶液,其中含有铁、镉、镍、铜等重金属离子杂质,必须仔细地加以除去。首先要除去铁。这就必须将亚铁Fe~(+2)氧化成Fe~(+3),才     

利用热处理方法制备纳米硫化锌晶体

通过液相沉淀法制备出无定形硫化锌粉末,硫化锌粉末经高温热处理后制得纳米硫化锌粉状晶体。具体过程为:将硫化钠溶液缓慢加入酸性的氯化锌溶液中,沉淀、洗涤、干燥后,研磨至200目以上,并在H_2气氛保护下于400℃温度焙烧,制得20～30nm粒径的硫化锌晶体。     

化学水浴沉积法制备硫化锌薄膜研究进展

硫化锌薄膜是重要的半导体光电材料。分析了化学水浴沉积法制备硫化锌薄膜的原理与机制,重点阐述了制备过程的影响因素及工艺的优化。简要介绍了采用该工艺制备的硫化锌薄膜在Cu（In,Ga）Se2薄膜太阳电池方面的应用。最后指出硫化锌薄膜作为一种性能优良、制备成本低廉、对环境友好的功能薄膜材料具有良好的应用前景。     

纳米硫化锌的制备及其研究进展

纳米硫化锌具有许多特异的光电性能 ,对其制备方法的研究越来越引起人们的重视。详细介绍了制备纳米硫化锌颗粒的固相法、液相法、气相法等不同方法并比较了它们的优缺点 ,结合纳米硫化锌材料的实际应用选用不同的制备方法 ,必将进一步推动纳米硫化锌的开发研究     

均匀沉淀法制备不同粒径的纳米硫化锌

以硫代硫酸钠为硫源,采用均匀沉淀法研究了不同粒径纳米硫化锌的制备,讨论了反应温度、加热方式、反应物的浓度及物质的量比对其粒径的影响。研究结果表明：通过控制制备工艺条件,采用均匀沉淀法可以制备出平均粒径为4～24 nm、立方晶型的球形纳米硫化锌;制备工艺条件对纳米硫化锌的平均粒径有显著影响;加热方式对硫化锌的平均粒径影响较大,微波加热比水浴加热制备的硫化锌粒径小;此外,纳米硫化锌的粒径随着反应温度的增加、反应物浓度的增加、醋酸锌和硫代硫酸钠物质的量比的减小而减小。     

制备条件对纳米硫化锌平均粒径的影响

由于纳米硫化锌的功能和用途不同,需要制备出不同粒径的球形纳米硫化锌。以乙酸锌为锌源,硫代硫酸钠为沉淀剂,采用均匀沉淀法研究了制备工艺对纳米硫化锌粒径的影响。     

中国塑料专利

聚乳酸-硫化锌纳米复合材料的制备方法本发明将纳米硫化锌的制备和聚乳酸的聚合一步完成,得到的聚乳酸-硫化锌纳米复合材料透明且具有抗紫外和光致发光特性,聚乳酸的摩尔质量高。本发明反应过程中所用溶剂的量相对较     

对硫酸锌生产中新问题的探讨

针对硫酸锌生产中出现的压滤困难、锌粉用量大、双氧水用量大及排放严重超标、回收率大大降低等问题,进行了一些有建设性地探讨,指出其根源很可能是氧化锌产品中人为地加入了硫化锌矿石粉。     

BaSO4／ZnS核壳复合纳米颜料的制备与表征

借助W/O/W多重乳液系统制备了纳米硫酸钡,以此作为水-甲苯乳状液的稳定剂,使硫代乙酰胺和氯化锌在乳状液界面上进行反应,生成纳米硫化锌并包裹在硫酸钡表面,得到质地松软、附着力较强的核壳型纳米复合颜料;并通过FT-IR、SEM、TEM、ED X等手段对其进行了表征。     

超重力法制备纳米材料的研究现状

纳米材料的合成与制备技术已成为全球的研究热点。介绍了一种独创性的纳米材料合成方法即超重力法。论述了超重力法的理论依据,并介绍了目前根据该法合成碳酸钙、氢氧化铝、硫化锌、氧化锌、硫酸钡、钛酸钙等纳米粉体材料的制备方法和工艺流程。     

Effect of the sulfide concentration on zinc bio-precipitation in a single stage sulfidogenic bioreactor at pH 5.5

Dissolved zinc is present in natural waters and process streams generated by the mining and metallurgical industry. These streams usually have a low pH. By using sulfate reducing bacteria, sulfide can be produced that precipitates with zinc as zinc sulfide (sphalerite), which can be easily separated from the wastewater and even reused as zinc concentrate. In this study, a sulfate reducing gas-lift bioreactor was operated at pH 5.5 using hydrogen as electron donor for sulfate reduction. We demonstrate effective zinc removal (7.2 mmol L⁻¹ d⁻¹) with low zinc effluent concentrations (0.65–8.8 μM) in a system combining sulfide generation by sulfate reducing bacteria (7.2–10.6 mmol SO₄²⁻ L⁻¹ d⁻¹) at low pH (5.5) with the bio-precipitation of crystalline sphalerite. To investigate the effect of the sulfide excess on the settling properties of the sphalerite precipitates, the sulfide excess concentration was varied about two orders of magnitude (0.008–2.2 mM). The results show that crystalline sphalerite was formed in all cases, but larger particles with better settling properties were formed at lower sulfide concentrations.     

二维硫化锌材料的制备及其研究进展

硫化锌是一种重要的宽带隙半导体材料,因其特殊的光电性质已引起制备领域的关注。目前对二维硫化锌的综述未见报道。综述了近5年来制备二维ZnS材料的气相法、液相法和固相法,分析比较了合成方法的优缺点,并对二维ZnS的制备提出了几点展望。     

Evaluation of anti-corrosive pigments by pigment extract studies, atmospheric exposure and electrochemical impedance spectroscopy

The inhibition efficiencies of zinc chromate, barium metaborate, calcium silicate, amino carboxylate, calcium barium phosphosilicate, aluminum triphosphate and a modified zinc phosphate on the corrosion of steel and zinc were determined by polarization experiments on pigment extracts. Zinc phosphate and zinc chromate were the best and were studied further to determine the effect of pH and chloride concentration on their inhibition of steel. Zinc chromate is adversely affected by high concentration of chloride ions, which effect seems to be less pronounced on zinc. A low pH, although increasing the solubility of zinc phosphate, does not increase its efficiency. The pigments were also incorporated into an epoxy-poly(amide) binder, applied to cold-rolled steel and galvanized steel, exposed at a marine exposure station and the degradation monitored by electrochemical impedance spectroscopy. There was a general correlation between the results of pigment extract studies and atmospheric exposure except in the case of phosphate pigments on cold rolled steel.     

污水中硫化物的一种检测方法

在含硫污水中加入乙酸锌,通过高速离心法进行预处理,得到硫化锌沉淀,倒出部分上清液,再加入弱碱性水与显色剂反应,最后通过分光度计或比色法测定硫化物的含量。该测定方法简便、易于操作,准确度高。     

SOLID-STATE REACTION BETWEEN BARIUM SULFATE AND CARBON

Barium sulfate is the chief source for the manufacture of barium compounds, which have a wide range of applications in chemical industries. In the preparation of these compounds, the first step is the reaction between barium sulfate and carbon to produce barium sulfide. In the present work, the mechanism of reaction between barium sulfate and carbon is investigated experimentally, covering a wide range of temperatures, times of reaction, and stoichiometric ratios of reactants. The reaction is conducted in air, nitrogen, and vacuum. It is also studied using the reactants in pellet form to determine the effect of compaction pressure on rate of reaction. A model is developed to estimate the kinetic parameters and mechanism of the reaction. An attempt is also made to study the feasibility of conducting the reaction for continuous production of barium sulfide in a moving bed rector using the reactants in pellet form.     

Desulfurization Over Metal Zeolites

Abstract

Metal oxides supported on zeolites have been demonstrated to be effective regenerable desulfurization agents for high temperature removal of hydrogen sulfide from fossil fuels. Metals of interest are iron and zinc. Zeolites of particular interest are commercially available zeolites with high hydrothermal stability such as synthetic mordenite and rare earth stabilized faujasite Y. The metals used as desulfurization agents are introduced by cation exchange. Zinc faujasite Y is of particular interest because of the demonstrated ability to reduce the hydrogen sulfide to several PPM concentration range in the desulfurized fuel in the temperature range of 500 to 650 C.     

Antibacterial Properties of Ester—Cross-Linked Cellulose–Containing Fabrics Post-Treated with Metal Salts

To improve the performance properties of cellulose-containing fabric, ester was cross-linked with polycarboxylic acid in the presence of specific catalysts. Its pendant carboxyl groups were exploited in binding some heavy metals (by reacting with some salts, such as zinc acetate, zinc chloride, zinc sulfate, cupric acetate, cupric chloride, cupric sulfate, and nickel sulfate) capable of imparting their antibacterial activity toward some gram-positive bacteria (viz., B. subtilis, B. mycoides, Sta. aureus) and a gram-negative bacteria (E. coli). Zinc salts impart to the fabric the highest antibacterial activity, followed by cupric acetate. Zinc chloride proved to be the metal salt that yielded the maximum antibacterial activity.     

电池级硫酸钴生产工艺研究进展

综述了7种含钴原料生产电池级硫酸钴的工艺技术。含钴原料不同,生产电池级硫酸钴的工艺技术也有较大差别。根据含钴原料特性将含钴原料细分为7种:含钴氧化矿、含钴硫化矿、副产钴渣、含钴合金废料、废钴催化剂、钴中间品、含钴电池废料。以含钴原料为出发点,对各种含钴原料生产电池级硫酸钴的工艺进行了综述。详细介绍和总结了浸出和精炼工艺的进展,并展望了电池级硫酸钴生产工艺的发展方向。