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生物质炭的制备和应用研究 总被引:1,自引:0,他引:1
《应用化工》2020,(7)
综述了利用农业废弃物制备生物质炭的研究进展,对不同制备原料的性质、特征,不同制备条件,如炭化、活化温度、活化类型,以及应用等进行了介绍,讨论了不同的农业废弃物制备生物质炭的最佳条件及不同用途,并展望了未来生物质炭制备和应用研究的前景。利用可再生的、廉价的农业废弃物制备生物质炭,不仅具有经济效益,还达到了保护环境、节约资源的目的。 相似文献
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纳米二硫化钼制备现状与发展趋势 总被引:14,自引:0,他引:14
从还原法、分解法、氧化法、电化学法等方面入手 ,评述了化学法制备纳米二硫化钼的现状。介绍了用单层MoS2 重堆积制备纳米插层化合物 (夹层化合物 )的方法 ,包括制备的机理、客体物质的种类及MoS2 插层化合物的性能与应用等。简要介绍了二硫化钼的结构、性质与功能以及制备纳米MoS2 的物理方法。最后对各种制备方法的优缺点进行了分析与对比 ,并展望了纳米MoS2 的制备技术与方法的发展前景 ,强调纳米MoS2 的制备应是多种方法相结合 ,朝着制备纳米复合型材料的方向发展的观点 相似文献
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A range of high purity iron oxides are prepared by varying basic operation parameters of an industrial spray roasting process. These iron oxides are investigated in relation to their morphology and subsequently evaluated as raw materials for MnZn-ferrite preparation. It appears that the most important morphological parameters for determining the reactivity (defined as firing shrinkage at equal compaction density) of the high purity iron oxide, and consequently the final density and magnetic properties of the ferrite specimens, are the primary particle size and the number of primary particles per aggregate. As found, the specific surface area of the iron oxide is of no predictive value for the behavior of the iron oxide in a MnZn-ferrite manufacturing process. A small primary particle size is important for a high reactivity; however, when particles are packed together in large aggregates, they are not available for the prefiring reactions. As a result, reactive sintering takes place leading to high porosity and bad microstructure. As found by the characterization methods employed in this article, the optimum iron oxides for MnZn-ferrite preparation should have a primary particle size between 0.45 and 0.55 μm with an aggregate size below 1.60 μm. 相似文献
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以氯化亚铁晶体为原料,在氧化氛围的固定床反应器中高温反应制备高品质的氧化铁红。主要研究了氧化温度和反应时间对产物的物相、纯度、色相、吸油量和粒径的影响,并讨论了氧化温度与氧化时间的关系。通过实验得到了制备高品质氧化铁红的最佳工艺条件:氧化温度为400 ℃,氧化时间为60 min。在此条件下得到的产物纯度为99.5%,色相纯正鲜艳,粒径为100~150 nm,吸油量为0.241 g/g。通过研究氧化温度与反应时间的关系,证明温度升高所需要的反应时间相应变短,即反应过程具有时温等效性。 相似文献
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硫铁矿渣湿法制备氧化铁红 总被引:2,自引:0,他引:2
以武汉天力集团的硫铁矿渣为原料,采用湿法工艺制备中间产品绿矾和最终产品氧化铁红。根据矿渣样品中杂质含量较大的特点,采取了多次过滤、加入除杂剂、重结晶等操作方法来提高产品纯度,使其达到国标规定要求,为其工业化提出了可行的建议。 相似文献
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利用二氯乙烷萃取邻二氮菲-铁(Ⅱ)-苦味酸盐三元配合物,可以藉分光光度法测定钛氧化物中的微量铁,表观摩尔吸光系数达1.22×105。方法灵敏、干扰少,已用于高纯钛氧化物中微量铁的测定。 相似文献
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Sung Jin Park SeungYeon Kim Seung Hoon Kim Kyung Min Park Byeong Hee Hwang 《Korean Journal of Chemical Engineering》2018,35(6):1297-1302
Magnetic nanoparticles have been applied in various fields because of their interesting magnetic properties. Immobilization on magnetic nanoparticles is a very important step in functionalizing them. We examined protein immobilization efficiency using interactions between his-tagged enhanced green fluorescence protein and affordable cationic ferrite magnetic nanoparticles for the first time. Four types of ferrite magnetic nanoparticles were verified: cobalt iron oxide, copper iron oxide, nickel iron oxide, and iron (III) oxide as negative controls. Among the four ferrite magnetic nanoparticles, copper ferrite magnetic nanoparticle was confirmed to have the highest immobilization efficiency at 3.0 mg proteins per gram ferrite magnetic nanoparticle and 78% of total enhanced green fluorescence protein. In addition, the maximum binding efficiency was determined for copper ferrite magnetic nanoparticle. Consequently, this newly verified his-tag-immobilizing capacity of copper ferrite magnetic nanoparticle could provide a facile, capable, and promising strategy for immobilizing his-tagged proteins or peptides with high purity for biosensors, magnetic separation, or diagnostics. 相似文献
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Iron oxide/SnO(2) magnetic semiconductor core-shell heterostructures with high purity were synthesized by a low-cost, surfactant-free and environmentally friendly hydrothermal strategy via a seed-mediated method. The morphology and structure of the hybrid nanostructures were characterized by means of high-resolution transmission electron microscopy and X-ray diffraction. The morphology evolution investigations reveal that the Kirkendall effect directs the diffusion and causes the formation of iron oxide/SnO(2) quasi-hollow particles. Significantly, the as-obtained iron oxides/SnO(2) core-shell heterostructures exhibited enhanced visible light or UV photocatalytic abilities, remarkably superior to as-used α-Fe(2)O(3) seeds and commercial SnO(2) products, mainly owing to the effective electron hole separation at the iron oxides/SnO(2) interfaces. 相似文献
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介绍了钛白副产硫酸亚铁的来源以及组成,综述了近几年来副产硫酸亚铁的综合利用情况,包括制备高纯二氧化锰、处理含铬废水、精制硫酸亚铁、制备聚合硫酸铁、制备氧化铁颜料等,变废为宝,获得一定的经济效益和社会效益。 相似文献
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介绍了用 80 %的环氧环己烷分别与三氟化硼乙醚、羟胺进行反应 ,将环氧环己烷中的戊醇、酮、醛生成高沸点产物 ,再进行精馏 ,从而获得高纯环氧环己烷的方法。确定了优惠工艺条件 ,考察了各种因素对反应的影响 ,反应收率 >80 % ,产品环氧环己烷含量 >98% 相似文献
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以石人沟铁矿精矿粉为原料生产超级铁精矿,进行了磨矿—反浮选、分级—反浮选和分级—低磁场磁选等试验,并按磨矿—反浮选方案建成了生产超级铁精矿的选矿厂。实践证明阳离子反浮选是生产低硅高纯铁精矿的可靠工艺。 相似文献