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Li Ning Li Guangming Yao Zhenya Zhao Jianfu 《Frontiers of Environmental Science & Engineering in China》2007,1(2):190-195
Catalytic wet air oxidation (CWAO) is one of the most promising technologies for pollution abatement. Developing catalysts
with high activity and stability is crucial for the application of the CWAO process. The Mn/Ce complex oxide catalysts for
CWAO of high concentration phenol-containing wastewater were prepared by coprecipitation. The catalyst preparation conditions
were optimized by using an orthogonal layout method and single-factor experimental analysis. The Mn/Ce serial catalysts were
characterized by Brunauer-Emmett-Teller (BET) analysis and the metal cation leaching was measured by inductively coupled plasma
torch-atomic emission spectrometry (ICP-AES). The results show that the catalysts have high catalytic activities even at a
low temperature (80°C) and low oxygen partial pressure (0.5 MPa) in a batch reactor. The metallic ion leaching is comparatively
low (Mn<6.577 mg/L and Ce<0.6910 mg/L, respectively) in the CWAO process. The phenol, CODCr, and TOC removal efficiencies in the solution exceed 98.5% using the optimal catalyst (named CSP). The new catalyst would
have a promising application in CWAO treatment of high concentration organic wastewater.
Translated from Techniques and Equipment for Environmental Pollution Control, 2005, 6(2): 40–44 [译自: 环境污染治理技术与设备] 相似文献
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The adsorption behaviour of Basic Red 12, Acid Orange 7 and Acid Blue 1 on zinc oxide nanoparticles (ZNP) has been investigated to understand the physicochemical process involved and to explore the possible use of nanoparticles in the treatment and management of textile waste matter. The dye removal capacity of ZNP towards Basic Red 12, Acid Orange 7 and Acid Blue 1 was found to be 15.64, 6.78 and 6.38 mg g?1, respectively. The adsorption process was pH dependent and optimum pH values of 9.0, 2.0 and 4.0 were obtained for Basic Red 12, Acid Orange 7 and Acid Blue 1, respectively. Equilibrium was established after 1.0 h for all dyes. Langmuir, Freundlich and Temkin isotherm models were applied to the system. The adsorbent ZNP was characterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) and Fourier transform infrared (FTIR) techniques. SEM analysis revealed the noticeable nanoporous morphology of the material. The results of FTIR spectroscopy showed that the process is driven by an electrostatic complexation mechanism. XRD studies revealed the nanocrystalline structure of ZNP. BET surface area measurement suggested a high pore volume and large surface area for the adsorbent. The kinetic measurements suggested pseudo-second-order kinetic processes with high regression coefficients and smaller standard error of estimate values and lower residual sum of squares. The thermodynamic measurements suggested that all processes were exothermic and accompanied by negative values for Δ G0, Δ S0 and Δ H0. 相似文献
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为获得高效催化活性的光催化材料,实现偶氮类染料的高效降解,试验以巯基乙酸钠作为硫源和高岭土改性剂合成了巯基高岭土/CeO2-CdS催化剂,并以降解结晶紫为模板反应,优化确定了巯基高岭土/CeO2-CdS催化剂的制备条件.采用XRD(X射线衍射)、SEM(扫描电子显微镜)、TEM(透射电子显微镜)、FTIR(傅里叶红外光谱)和UV-Vis(紫外-可见光漫反射光谱)对催化剂进行了表征.结果表明:①催化剂是由巯基高岭土、立方相结构的CdS和萤石结构的CeO2组成;②CdS和CeO2的负载破坏了巯基高岭土的层状结构;③最优催化剂和巯基高岭土/CeO2的可见光的响应范围分别为550和450 nm;④当CeO2:CdS(摩尔比,下同)为4:6,巯基高岭土:CeO2-CdS(质量比,下同)为1:3时,催化剂具有最优的光催化活性;⑤在50 mL结晶紫浓度为10 mg/L的溶液中,添加0.1 g最优催化剂后,采用350 W氙灯对其光照150 min时,结晶紫的降解率为95.1%;⑥最优催化剂具有良好的重复使用性能,重复使用5次时,对结晶紫的降解率为90.4%.研究显示,结晶紫降解的最终产物为CO2和H2O,催化剂对结晶紫的降解机理是以羟基自由基氧化为主和超氧基氧化为辅的共存氧化机理. 相似文献
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马拉巴栗净化室内空气中甲醛的研究 总被引:2,自引:0,他引:2
采用观赏性植物马拉巴栗(也称发财树,Pachira aquatica)进行甲醛去除试验,在模拟箱内通过甲醛分析仪研究甲醛质量浓度随时间的变化规律。结果表明,当模拟箱(1.25m×1.25m×1.25m)内甲醛初始质量浓度分别为0.24mg·m-3、0.40mg·m-3和0.53mg·m-3时,分别经过10h、14h和11h后甲醛的去除效率可以达到100%。在空白箱子及放植物的箱子内壁及植物叶片上喷洒1%的二氧化钛(TiO2)溶胶后,二者分别经过12h和10h后降低为零。试验证明,马拉巴栗对甲醛具有良好的吸收降解效果。 相似文献
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聚硅酸溶胶和凝胶的电镜观察 总被引:8,自引:1,他引:8
用透射电子显微镜(TEM)和扫描电子显微镜(SEM)观察了硅酸溶胶的聚合过程。在pH值与Na2O·nSiO2模数一定时,其聚合速度与温度有关,温度高聚合快。聚硅酸溶胶粒子主要是圆形或椭圆形颗粒,粒子由于聚集变大,硅酸凝胶具有毛刷结构,其间隙被水填充。反应时,聚集、聚合和溶解同时进行,最后聚集起主要作用,凝胶形成。 相似文献
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