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UV/草酸铁/H2O2法处理染料废水 总被引:3,自引:0,他引:3
采用UV/草酸铁/H2O2法处理染料废水,考察了体系中K2C2O4浓度、FeSO4浓度、H2O2浓度、pH值及反应温度对吡啰红染料废水色度去除效果的影响.结果表明,UV/草酸铁/H2O2法能有效地使染料水溶液迅速脱色,草酸铁的加入能提高脱色速率,H 2O2/FeSO4/K2C2O4的摩尔比为100:7:1时,吡啰红脱色效果最好;另外,通过测定降解过程中吸光度、电导率、pH值的变化,揭示了降解产物中无机粒子的变化规律及某些可能的产物类型。 相似文献
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UV/草酸铁络合物处理直接冻黄染料的实验研究 总被引:2,自引:0,他引:2
采用UV/草酸铁络合物对直接冻黄染料废水进行处理.研究了H2O2 K2O2O4和Fe2 (SO4)3·7H2O的投加量、pH值、光照时间等因素对染料废水处理效果的影响和最佳处理条件.结果表明,pH值4,30%H2O2的投加量0.5mL·L-1、0.1mol·L-1 Fe2(SO4)3·7H2O的投加量5.0mL·L-1,0.1moL·L-1K2C2O4的投加量7.5mL·L-1,UV光照时间16min的最佳条件下,70mg·L-1的直接冻黄模拟染料废水脱色率可达96.52%.通过和UV/Fenton法进行对比实验,UV/草酸铁法优于UV/Fenton法,是一项有研究价值和开发应用前景的污染治理新技术. 相似文献
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UV—Vis/H2O2/草酸铁络合物法在水处理中的应用 总被引:23,自引:0,他引:23
介绍了各光Fenton法的运行机理及存在的优缺点,综述了UV-Vis/H2O2/草酸铁络合物法在水处理中的应用状况,并对其今后的发展趋势进行了阐述。UV-Vis/H2O2/草酸铁络合物法是一种新的高级氧化技术,是对光Feton法的发展,在处理高浓度难降解有机废水方面效果优于UV/Fe^2 /H2O2法、UV/H2O2法、TiO2法和WO3法等,因其具有一定的利用太阳能的潜力,所以具有较好的应用前景。 相似文献
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UV/Mn2+协同催化H2O2氧化降解染料X-3B的研究 总被引:3,自引:1,他引:2
研究了UV和Mn2+协同催化H2O2(UV/Mn2+-H2O2)降解染料活性艳红X-3B的过程.结果表明,X-3B在UV/Mn2+-H2O2中的降解速率达0.098 4 min-1,是Mm2+催化H2O2和UV催化H2O2速率之和的3.0倍,协同催化作用加速了·OH对废水的降解.对初始质量浓度为150 mg·L-1的X-3B溶液,初始pH为4、MnSO4及H2O2的投加量分别为2和10 mmol·L-1,反应60 min后,脱色率达到100%,而该条件下染料的极限降解量为294 mg·L-1UV-vis光谱分析发现X-3B在可见光区的吸收几乎完全消失,在211nm处产生新吸收峰,说明降解过程产生了新的中间产物. 相似文献
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以偶氮染料橙黄G(OG)为目标污染物,研究Fe2+分别催化H2O2、S2O82-、H2O2-S2O82-降解0.1 mmol/LOG Fe2+/H2O2体系,[Fe2+]=1 mmol/L,pH=3,[H2O2]0=10 mmol/L,降解30 min OG脱色率为96%,随着pH值增大和[H2O2]0>10 mmol/L,OG脱色率减小,呈线性变化。Fe2+/S2O82-体系,随着S2O82-初始浓度增加OG脱色率增大,随着pH值增大OG脱色率减小,呈非线性变化。Fe2+/H2O2-S2O82-体系,pH=3,[H2O2]0=2 mmol/L,[S2O82-]0>10 mmol/L时OG脱色率持续增大。Fe2+/H2O2-S2O82-体系矿化率最高。利用乙醇和硝基苯作为分子探针,采用分子探针竞争实验鉴定该体系中产生的SO4.和OH.。 相似文献
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UV -vis/H2 O2 /草酸铁络合物法是一种高级氧化工艺 ,这个工艺产生的羟自由基·OH是一种很强的氧化剂 ,能很快和水中有机物发生反应 .以苯胺为处理对象对该法的氧化能力和效果进行了研究 ,并确定了降解苯胺的最佳工艺条件 :pH =3 .5 ,Fe2 + ∶H2 O2 ∶C2 O2 -4 ≈ 1∶4∶6 (mole) .UV -vis/H2 O2 /草酸铁络合物法处理高浓度苯胺水样非常有效 ,12min内苯胺去除率均在 99%以上 .流动法处理苯胺模拟废水的效果明显好于静态法 相似文献
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UV -vis/H2 O2 /草酸铁络合物法是一种高级氧化工艺 ,这个工艺产生的羟自由基·OH是一种很强的氧化剂 ,能很快和水中有机物发生反应 .以苯胺为处理对象对该法的氧化能力和效果进行了研究 ,并确定了降解苯胺的最佳工艺条件 :pH =3 .5 ,Fe2 + ∶H2 O2 ∶C2 O2 -4 ≈ 1∶4∶6 (mole) .UV -vis/H2 O2 /草酸铁络合物法处理高浓度苯胺水样非常有效 ,12min内苯胺去除率均在 99%以上 .流动法处理苯胺模拟废水的效果明显好于静态法 相似文献
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UV-vis/H2O2/草酸铁络合物法光解难降解有机物的研究述评 总被引:7,自引:0,他引:7
UV-vis/H2O2/草酸铁络合物法是一种新的高级氧化技术,该方法处理效果优于UV-vis/Fe^2 /H2O2法、TiO2法和WO3等法等,具有良好的应用前景。 相似文献
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Surface-phase ZrO2 on SiO2 (SZrOs) and surface-phase La2O3 on Al2O3 (SLaOs) were prepared with various loadings of ZrO2 and La2O3, characterized and used as supports for preparing Pt/SZrOs and Pt/SLaOs catalysts. CH4/CO2 reforming over the Pt/SZrOs and Pt/SLaOs catalysts was examined and compared with Pt/Al2O3 and Pt/SiO2 catalysts. CO2 or CH4 pulse reaction/adsorption analysis was employed to elucidate the effects of these surface-phase oxides.
The zirconia can be homogeneously dispersed on SiO2 to form a stable surface-phase oxide. The lanthana cannot be spread well on Al2O3, but it forms a stable amorphous oxide with Al2O3. The Pt/SZrOs and Pt/SLaOs catalysts showed higher steady activity than did Pt/SiO2 and Pt/Al2O3 by a factor of three to four. The Pt/SZrOs and Pt/SLaOs catalysts were also much more stable than the Pt/SiO2 and Pt/Al2O3 catalysts for long stream time and for reforming temperatures above 700 °C. These findings were attributed to the activation of CO2 adsorbed on the basic sites of SZrOs and SLaOs. 相似文献
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Cu2O/TiO2, Bi2O3/TiO2 and ZnMn2O4/TiO2 heterojunctions were studied for potential applications in water decontamination technology and their capacity to induce an oxidation process under VIS light. UV–vis spectroscopy analysis showed that the junctions-based Cu2O, Bi2O3 and ZnMn2O4 are able to absorb a large part of visible light (respectively, up to 650, 460 and 1000 nm). This fact was confirmed in the case of Cu2O/TiO2 and Bi2O3/TiO2 by photocatalytic experiments performed under visible light. A part of the charge recombination that can take place when both semiconductors are excited was observed when a photocatalytic experiment was performed under UV–vis illumination. Orange II, 4-hydroxybenzoic and benzamide were used as pollutants in the experiment. Photoactivity of the junctions was found to be strongly dependent on the substrate. The different phenomena that were observed in each case are discussed. 相似文献
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Motonobu Kobayashi Ryoji Kuma Sinyuki Masaki Noboru Sugishima 《Applied catalysis. B, Environmental》2005,60(3-4):173-179
TiO2-SiO2 with various compositions prepared by the coprecipitation method and vanadia loaded on TiO2-SiO2 were investigated with respect to their physico-chemical characteristics and catalytic behavior in SCR of NO by NH3 and in the undesired oxidation of SO2 to SO3, using BET, XRD, XPS, NH3-TPD, acidity measurement by the titration method and activity test. TiO2-SiO2, compared with pure TiO2, exhibits a remarkably stronger acidity, a higher BET surface area, a lower crystallinity of anatase titania and results in allowing a good thermal stability and a higher vanadia dispersion on the support up to high loadings of 15 wt% V2O5. The SCR activity and N2 selectivity are found to be more excellent over vanadia loaded on TiO2-SiO2 with 10–20 mol% of SiO2 than over that on pure TiO2, and this is considered to be associated with highly dispersed vanadia on the supports and large amounts of NH3 adsorbed on the catalysts. With increasing SiO2 content, the remarkable activity decrease in the oxidation of SO2 to SO3, favorable for industrial SCR catalysts, was also observed, strongly depending on the existence of vanadium species of the oxidation state close to V4+ on TiO2-SiO2, while V5+ exists on TiO2, according to XPS. It is concluded that vanadia loaded on Ti-rich TiO2-SiO2 with low SiO2 content is suitable as SCR catalysts for sulfur-containing exhaust gases due to showing not only the excellent de-NOx activity but also the low SO2 oxidation performance. 相似文献
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O2/CO2气氛下煤燃烧SO2/NO析出特性 总被引:2,自引:0,他引:2
在水平管式炉上研究了O2浓度、CO2浓度、温度及石灰石添加等各参数对O2/CO2气氛下徐州烟煤和龙岩无烟煤燃烧过程中SO2/NO排放特性的影响。结果发现,O2/CO2气氛下,烟煤和无烟煤燃烧SO2/NO的析出规律与空气气氛下不同,同等O2浓度下析出量比空气气氛下小。O2/CO2气氛下,随着O2浓度的提高,烟煤和无烟煤SO2/NO排放量均增大;随着CO2浓度的升高, SO2/NO排放量均减小。O2/CO2气氛下,石灰石添加对SO2排放的抑制作用低于空气气氛下;石灰石添加对NO的排放有一定减排作用。对煤灰的元素分析显示O2/CO2燃烧对SO2的抑制主要是由于煤灰的自固硫能力增强,而对NO的减排作用则是促进燃料N向其他含N气体的转换。 相似文献
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O_2/N_2、O_2/CO_2和O_2/CO_2/NO气氛下煤粉燃烧NO_x排放特性 总被引:1,自引:0,他引:1
利用滴管炉研究了O2/N2、O2/CO2和O2/CO2/NO气氛下煤燃烧过程中NOx的排放特性。实验结果表明,在O2/N2和O2/CO2气氛下,高温或高O2浓度均使NO排放量增加。O2/CO2气氛下NO排放量比O2/N2气氛下NO排放量低大约30%~40%。在O2/CO2/NO气氛下,温度不同时,O2浓度变化对NO排放量的影响规律不同,对循环NO降解的影响规律也不同。高温不利于循环NO降解。随停留时间的延长NO排放量出现两个峰值。 相似文献
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To study the feasibility of CO2 geological sequestration,it is needed to understand the complicated mul- tiple-phase equilibrium and the densities of aqueous solution with CO2 and multi-ions under wide geological condi- tions(273.15—473.15K,0—60MPa),which are also essential for designing separation equipments in chemical or oil-related industries.For this purpose,studies on the relevant phase equilibria and densities are reviewed and analyzed and the method to improve or modify the existing model is suggested in order to obtain more reliable predictions in a wide temperature and pressure range.Besides,three different models(the electrolyte non random two-liquid(ELECNRTL),the electrolyte NRTL combining with Helgeson model(ENRTL-HG),Pitzer activity coefficient model combining with Helgeson model(PITZ-HG))are used to calculate the vapor-liquid phase equilib- rium of CO2-H2O and CO2-H2O-NaCl systems.For CO2-H2O system,the calculation results agree with the experimental data very well at low and medium pressure(0—20MPa),but there are great discrepancies above 20MPa.For the water content at 473.15K,the calculated results agree with the experimental data quite well.For the CO2-H2O-NaCl system,the PITZ-HG model show better results than ELECNRTL and ENRTL-HG models at the NaCl concentration of 0.52mol·L ^-1 .Bur for the NaCl concentration of 3.997mol·L ^-1 ,using the ELECNRTL and ENRTL-HG models gives better results than using the PITZ-HG model.It is shown that available experimental data and the thermodynamic calculations can satisfy the needs of the calculation of the sequestration capacity in the temperature and pressure range for disposal of CO2 in deep saline aquifers.More experimental data and more accurate thermodynamic calculations are needed in high temperature and pressure ranges(above 398.15K and 31.5MPa). 相似文献
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Xinmei LIU Shaofen BAI Huidong ZHUANG Zifeng YAN 《Frontiers of Chemical Science and Engineering》2012,6(1):47
Cu/ZrO2 catalysts for methanol synthesis from CO2/H2 were respectively prepared by deposition coprecipitation (DP) and solid state reaction (SR) methods. There is an intimate interaction between copper and zirconia, which strongly affects the reduction property and catalytic performance of the catalysts. The stronger the interaction, the lower the reduction temperature and the better the performance of the catalysts. Surface area, pore structure and crystal structure of the catalysts are mainly controlled by preparation methods and alkalinity of synthesis system. The conversion of CO2 and selectivity of methanol are higher for DP catalysts than for SP catalysts. 相似文献