共查询到19条相似文献,搜索用时 105 毫秒
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介绍了溶胶-凝胶法(SG法)和沉淀-浸渍法(PD法)制备纳米TiO2光催化剂的方法。以0.12g/L的活性艳蓝X—BR染料溶液为光降解模拟废水,对纳米TiO2进行了光催化活性的评价。结果显示,采用SG法和PD法制备纳米TiO2,最佳焙烧温度均为500℃,在此温度下用PD法制备的TiO2对染料的降解率达100%,SG法制备的TiO2对染料的降解率达87.01%。采用X射线衍射(XRD)法对催化剂的结晶形态、颗粒尺寸等进行了表征,结果显示,两种方法制备的TiO2粒径相近,均随焙烧温度升高而增大;而PD法制备的TiO2具有更好的耐高温性;与SG法相比,PD法具有工艺简化、制备周期短的优点。 相似文献
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通过四球摩擦磨损试验和铜板带冷轧试验,对含纳米TiO 2添加剂的冷轧乳化液和未添加纳米添加剂的传统乳化液的摩擦学性能进行对比试验。结果表明:含纳米TiO2添加剂的轧制乳化液与传统轧制乳化液相比,减摩性能和极压性能均有所改善;在铜板带冷轧过程中,采用含纳米TiO2添加剂的轧制乳化液进行润滑可有效降低轧制压力和提高极限压下率,并且能及时修复轧后铜板带表面缺陷,提高表面质量。 相似文献
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纳米TiO2光催化处理乙烯工业废水的研究 总被引:1,自引:0,他引:1
以纳米二氧化钛作为光催化剂,对乙烯工业废水进行降解实验研究,考察了常温下催化剂的用量、光照时间及pH值等因素对工业废水处理效果的影响,筛选出最佳的光催化处理工艺条件。在最佳处理工艺条件下,COD和氨氮的降解率分别达到94.1%和84.5%。 相似文献
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铋掺杂纳米TiO2的制备及其光电催化性能 总被引:1,自引:0,他引:1
以钛酸丁酯和硝酸铋为主要原料,采用溶胶一凝胶法制备了掺杂铋的纳米TiO2(Bi—TiO2)。用XRD、TEM等方法对产物进行了表征:晶型为锐钛矿,粒径范围15—25nm。以罗丹明B(RhB)为目标降解物,分别考察制备的Bi—TiO2催化剂的光、电催化活性。结果显示,Bi^3+掺杂摩尔分数为0.5%、质量浓度为0.2g/L的Bi—TiO2催化剂对RhB的光催化效果最佳;采用三维电极法降解RhB,以负载Bi-TiO2的多孔材料为粒子电极的电催化降解效果最佳。 相似文献
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一种新型润滑油抗磨添加剂的研究Ⅱ. TiO2纳米粒子的表面修饰及摩擦磨损性能评定 总被引:10,自引:0,他引:10
用硬脂酸和己二酸对溶胶-凝胶-超临界干燥法制备的TiO2纳米粒子进行表面改性,不仅解决了TiO2纳米粒子在有机介质中的分散性问题,而且由于表面修饰层的存在,控制了纳米粒子的进一步长大和团聚,在四球摩擦试验机上考察了表面改性纳米粒子的摩擦学性质,结果表明,脂肪酸修饰的TiO2纳米粒子具有突出的减小磨损的性能,承载能力明显优于T202。 相似文献
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碱金属掺杂纳米TiO2的制备及其光催化性能 总被引:2,自引:0,他引:2
采用溶胶-凝胶法制备了掺杂K^+或Cs^+的纳米TiO2催化剂。以甲基橙为目标降解物,研究了K^+或Cs^+的掺杂量对纳米TiO2光催化活性的影响,讨论了催化剂加入量以及催化降解时间对甲基橙降解效果的影响。结果表明,适量掺杂K^+能够提高TiO2的光催化活性,最佳掺杂量(摩尔分数)为1%;掺杂Cs^+只会降低TiO2的光催化活性。对浓度为20mg/L的甲基橙溶液进行催化降解,催化剂K^+-TiO2(K^+掺杂量1%)最佳用量为2g/L,降解时间60min,甲基橙的降解率可达98%。 相似文献
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选用钛酸丁酯为原料,用溶胶-凝胶-超临界干燥法合成了TiO2纳米粒子,结果表明,在c(Ti^4)=0.3-1.0mol/l,c(H2O)/c(Ti^4 )=2-12,c(HAc)=0.3-2.4mol/l这一较宽的范围内均可以得到TiO2醇酸胶,经过适当老化时间后,进行超临界干燥,得到的TiO2纳米粒子粒径是20-30nm,为球形,无定形态。 相似文献
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纳米TiO2处理河南油田压裂废水技术研究 总被引:5,自引:0,他引:5
通过对压裂废液成分的分析,结合纳米催化氧化的原理和特点,提出了一套纳米光化技术处理压裂废液的方案,即:采用混凝—氧化—吸附—光化法处理压裂液,加入0.25 g/L混凝剂C-10、.1 g/L助凝剂C-6、0.05g/L助凝剂C-7、0.3 mg/L氧化剂O-1和1 g/L吸附剂A-1,最后进行光化处理。处理后出水进入系统水后没有生成沉淀、气体等,对系统水水质没有较大改变,处理后出水的pH值为7.11、含铁为0.5 mg/L、含油为0.5 mg/L、含硫为7.6 mg/L、细菌为76个/mL、悬浮物为4.7 mg/L,达到了回注标准。该技术已经在河南油田进行了中试,取得了较好的效果。 相似文献
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将油溶性纳米 Cu(n-Cu)微粒作为添加剂用于板带钢冷轧乳化液中,考察了其对乳化液极压性能和摩擦学性能的影响,在 JC2000C1润湿角测试仪上测定了乳化液在带钢表面的润湿性能,并在四辊冷轧试验机上进行了乳化液润滑下的板带钢冷轧试验。结果表明,在板带钢冷轧乳化液中添加0.06%质量分数的 n-Cu 后,能更好地改善乳化液的极压抗磨性能、降低钢/钢摩擦系数;提高乳化液在带钢表面流动润湿性能的同时,还表现出良好的板带钢冷轧润滑效果,可明显降低板带钢最小可轧厚度,并可以改善轧制带钢板形和表面质量。 相似文献
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以柴油、乳化剂、纳米二氧化硅为主要原料,配制了一种可用于油田选择性堵水用的纳米粒子稳定反相乳液,考察多种因素对其性能的影响。实验结果表明,乳化剂用量对乳状液粘度影响不大,其用量选择2%较合适;油相中纳米二氧化硅用量增加,乳状液粘度随之增加,当油相中纳米二氧化硅含量低于0.2%时,乳状液粘度随温度升高而上升,添加少量纳米二氧化硅即可改变乳状液粘-温特性;调节油水体积比可调整乳状液的粘度,并且当水油比大于4:1时,乳状液的粘度急剧上升;氯化钠加入也导致乳状液的粘度随温度的增加而升高。 相似文献
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Appropriate base oils and homologous additives such as extreme pressure and anti-wear agents,oiliness agents and antioxidants were selected,and experiments testing the compatibility performance between additive,base oil and other components were carried out to develop the SK and SD series of rolling oils for cold rolling of stainless steel.The developed oils were used in the stainless steel cold rolling lubrication experiments,and were successfully applied in the actual cold rolling operation of stainless steel.Compared with a foreign product,the tribological properties,the thermal oxidation stability,and the rolling lubrication performance of the developed stainless steel cold rolling oils were studied.Test results showed that the tribological properties of the thereby developed rolling oils and the reference one were almost at the same level,and to some extent the performance of rolling was even better than the foreign product,at the same time the stainless steel sheet could retain its well annealed performance.Meanwhile,within a certain range,the lubrication of the rolling oil became better as its viscosity increased at the same level of saponification value,which could provide a lower friction coefficient,so that a higher maximum reduction ratio of the rolled piece through a constant roll gap and a minimum thickness could be secured.Also,similar phenomena appeared as the saponification value increased at a same viscosity level of the rolling oils. 相似文献
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The nano-MoS2 particles were adopted to substitute for the extreme-pressure and anti-wear additives to the rolling fluid for steel strips.An optimal formulation and technical process for adding nano-MoS2 particles to the rolling fluid were obtained through orthogonal experiments with three factors at three levels.The tests have led to the following conclusions:(a) the nanoparticles should be added to a base oil with high saponification value;(b) the concentration of nanoparticles in rolling fluid should be equal to 0.6%;and (c) when the reaction time needed for surfactants (oleic acid,for example) to modify the nanoparticles was 40 min,the rolling fluid could have the best tribological properties.The lubricity of rolling fluid was verified by using a 4-high cold rolling test mill which showed that the rolling fluid with nano-MoS2 particles had the excellent lubricant performance to improve the surface quality of the steel strip remarkably.The mechanism of nano-MoS2 particles in the rolling process has been investigated by a series of characterization instruments,which have showed that,with its fullerene-like structure,the nano-MoS2 particles have self-lubricating properties and extra-low friction coefficient,and can easily form a protective film with low shear strength on the surface of friction pairs. 相似文献
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通过在四球摩擦磨损试验机接触区设置直流磁场发生装置,研究了磁场作用下添加纳米MoS2润滑油的摩擦磨损性能。采用扫描电镜(SEM)、能谱仪(EDS)及X射线光电子能谱仪(XPS)对钢球磨斑表面形貌和典型元素的含量及化学状态进行了分析,探讨了纳米MoS2的摩擦学机理。试验结果表明:纳米MoS2在有磁场和无磁场条件下均能有效改善润滑油的减摩抗磨性能,且在有磁场条件下效果更为明显,因为不均匀的直流磁场能使纳米MoS2在摩擦表面富集,同时也促进摩擦化学反应进行。 相似文献
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合成油酸丁酯用TiSiW12O40/TiO2-SnO2催化剂的制备与性能研究 总被引:4,自引:0,他引:4
制备出以混合氧化物为载体的固载杂多酸盐催化剂TiSiWl2O40/TiO2-SnO2,以油酸和正丁醇为原料,系统研究了催化合成油酸丁酯的影响因素,确定了该反应的优化条件:醇酸摩尔比为2:1,催化剂用量为反应物总质量的1.5%,反应时间60min,反应温度130—140℃。在此反应条件下,油酸丁酯的收率达到90.8%。 相似文献
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The synthetic oil has been extensively used in the miniature bearing thanks to its good low-temperature fluidity. However, most of commercial synthetic oils cannot meet the requirements for operating at ultra-low temperature, demanding that the lubricating oil should flow below -60 °C with its ISO VG being greater than 10 mm2/s. In this paper, the relationships between the structures of the ester, polyether, and silicone oils, and low temperature fluidity were investigated. The results showed that the low-temperature fuidity of oil having a shorter molecular chain length and a smaller molecular weight became better. Moreover, except the silicone oil, other synthetic oil cannot reach the requirements of working at ultra-low temperature. Silicone oil has good low-temperature properties, but it has poor lubricating properties in an environment where steel is sliding against steel. Then based on the analytical results, a new type of non-Newtonian oil was developed. The test results showed that the fluidity of the newly developed oil at below -60 °C is much better than that of the commercial 4123, 4129 ester type aviation lubricants. In addition, it has good lubricating performance, which is much better than that of the silicone oil. The non-Newtonian oil demonstrates a promising prospect for application in miniature bearings operating at low load and ultra-low temperature. 相似文献
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新型原油生物复合破乳剂的研究与应用 总被引:7,自引:1,他引:7
本文对所开发的新型原油生物复合破乳剂进行了室内与现场试验,考察了破乳剂破乳脱水及减少脱出水油含量的性能。结果显示,与现用化学破乳剂对比,原油生物复合破乳剂具有优良的破乳脱水性能,而且破乳后的油水界面清晰,脱出水油含量低。可用原有的加药流程,操作简单方便。 相似文献
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采用硅氢加成反应、环氧开环季铵化反应两步法:即将烯丙基聚氧乙烯聚氧丙烯环氧基醚(环氧醚)与烯丙基聚氧乙烯聚氧丙烯甲基醚(甲基醚)接枝到含氢硅油上,得到环氧醚与甲基醚共改性硅油中间体,然后中间体经环氧开环季铵化反应得到针对水包油型原油乳液的新型聚醚季铵盐聚硅氧烷原油破乳剂(简称O/W破乳剂)。利用FTIR和~1H NMR等技术分析了O/W破乳剂的结构,考察了破乳条件对O/W破乳剂性能的影响。实验结果表明,适宜的破乳条件为:破乳剂用量110 mg/L(基于原油乳液质量)、n(环氧醚):n(甲基醚)=2:1、脱水温度65℃、脱水时间2.0 h。在此条件下,使用O/W破乳剂时原油乳液的脱水率为93.51%,水相含油率为47 mg/L,破乳性能优于工业常用季铵盐阳离子型破乳剂BO-05。 相似文献