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以九水硝酸铁为铁源、钛酸四丁酯为钛源,以表面刻蚀的高炉水淬渣(water-quenched blast furnace slag,WBFS)为载体,采用溶胶凝胶法制备WBFS负载Fe2O3(Fe2O3/WBFS)和WBFS负载TiO2 (TiO2/WBFS)以及WBFS负载Fe2O3和TiO2(TiO2/Fe2O3/WBFS)光催化材料.利用差热-热重、X射线衍射仪、扫描电子显微镜对光催化材料的物相和形貌进行表征.以亚甲基蓝为模拟污染物进行光催化实验.结果表明:Fe2O3/WBFS和TiO2/WBFS光催化材料的适宜煅烧温度分别为700℃和450℃,其表面负载物相分别为赤铁矿型α-Fe2O3和锐钛矿型TiO2.TiO2/Fe2O3/WBFS光催化活性优于Fe2O3/WBFS和TiO2/WBFS,在可见光照射360 min时,Fe2O3/WBFS、TiO2/WBFS和TiO2/Fe2O3/WBFS对亚甲基蓝的降解率分别达到80%、65%和90%. 相似文献
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以碳酸根型镁铝层状双氢氧化物(LDH)为载体,采用溶胶-凝胶法利用酞酸丁酯水解负载纳米TiO2于LDH片层获得TiO2/LDH前驱体,通过低温焙烧前驱体获得纳米二氧化钛/层状双金属氧化物复合物(TiO2/LDO).以亚甲基蓝溶液模拟染料污染物,在波长291 nm紫外光条件下测定吸光度,评价了光催化剂不同投加量,体系pH值以及光照时间条件下对亚甲基蓝降解率的影响,研究了TiO2/LDO的光催化性能.结果表明:通过溶胶-凝胶法可以获得高分散纳米级(<10 nm)TiO2负载型TiO2/LDH复合物,TiO2/LDH中TiO2负载率达8.01wt%(质量分数);TiO2/LDO的光催化性能较纯LDO高,TiO2负载于LDO层板对亚甲基蓝具有协同催化作用;在pH值为9的80 mL亚甲基蓝溶液(浓度为5 mg/L)中投入0.20 g TiO2/LDO,催化反应8 h后降解率高达81.7%,TiO2/LDO对亚甲基蓝溶液的光催化反应符合一级动力学方程. 相似文献
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以膨胀珍珠岩为载体,钛酸四丁酯为原料,用溶胶-凝胶法制备漂浮型纳米TiO2光催化剂,并用该光催化剂在太阳光下对亚甲基蓝进行光催化降解实验.结果表明,在450℃焙烧2h,负载3次的条件下制备的漂浮型催化剂光催化活性较好.150 mg漂浮型纳米TiO2/EP在30 mL亚甲基蓝溶液(4 mg/L)液面平铺,经120 min太阳光照射,亚甲基蓝的降解率为97.6%.XRD和SEM分析结果表明,二氧化钛为结晶良好的锐钛矿型,粒径大约为8nm.漂浮型纳米TiO2/EP有较广阔的工程应用前景. 相似文献
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采用浸渍-提拉法在玻璃纤维(GF)表面负载纳米TiO2,制备TiO2/GF复合光催化剂.通过X射线衍射(XRD)、热重-差热分析(TG-DSC)、扫描电镜(SEM)及能谱元素分析(EDS)对TiO2/GF复合光催化剂的结构进行了表征.结果表明,经550 ℃以下热处理,TiO2的晶型为锐钛矿相,随着热处理温度的升高,TiO2的晶型逐渐转化为金红石相.以亚甲基蓝的光催化降解为探针反应,评价TiO2/GF复合材料的光催化活性.复合材料的光催化降解活性与P25相当,且经多次使用后,复合光催化剂对亚甲基蓝的降解率仍保持在80%以上. 相似文献
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采用溶胶-凝胶法在二氧化硅(SiO2)纳米微球表面负载纳米二氧化钛(TiO2),制备核-壳SiO2@TiO2复合纳米颗粒.采用X射线衍射仪(XRD)、环境扫描电子显微镜(SEM-EDS)、比表面积测定(BET)等研究手段对样品的矿物组成、结构形貌进行了表征,并考察了其光催化活性.结果 表明:溶胶-凝胶法后期的热处理明显提高了核-壳SiO2@TiO2复合纳米颗粒光催化降解亚甲基蓝溶液的能力,其中,经过400℃热处理的样品催化效果最好,对质量浓度为20 mg/L的亚甲基蓝溶液90 min的降解率达到96.27%. 相似文献
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采用溶胶-凝胶法制备了Ce3 /TiO2光催化剂,研究了该催化剂对亚甲基蓝的光催化降解效果.结果表明掺杂量w(Ce3 )3.7%,催化剂用量0.12 g·L-1,体系pH值为10,12 mg·L-1亚甲基蓝溶液经2 h光催化降解,其降解率可达98.87%,与纯TiO2相比,Ce3 /TiO2光催化剂显示出良好的光催化活性. 相似文献
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采用溶胶-凝胶法制备了La^3+/TiO2光催化剂,研究了该催化剂对亚甲基蓝的光催化降解效果。结果表明,La^3+掺杂量(摩尔分数)2.8%、催化剂用量1.2g/L、体系pH值为11时,12mg/L亚甲基蓝溶液经2h光催化降解,其降解率可达99.1%。与纯TiO2相比,La^3+/TiO2光催化剂显示出良好的光催化活性。 相似文献
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本文利用溶胶-凝胶法实现了二氧化钛(TiO2)膜层在粉煤灰漂珠表面的负载,得到TiO2/漂珠复合光催化剂;采用原位聚合的方法将聚吡咯负载到TiO2/漂珠复合光催化剂上,实现材料的敏化改性,成功制备出聚吡咯-二氧化钛/漂珠(PPy-TiO2/漂珠)复合光催化材料.以亚甲基蓝(MB)为降解对象,研究了在不同吡咯(Py)与Ti投加摩尔比和不同掺杂盐酸浓度条件下制备的PPy-TiO2/漂珠复合光催化材料在可见光下的催化效果,并结合SEM、XRD、UV-vis等表征手段较为系统地研究了复合光催化剂的表面形态、晶体结构、光响应范围等.结果表明:PPy-TiO2/漂珠的光催化活性优于TiO2/漂珠,当Py/Ti摩尔比为1%,以lmol/L盐酸溶液为掺杂剂时所制备的PPy-TiO2/漂珠复合光催化剂光催化降解性能最优. 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献