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《化学工程》2016,(5):11-16
采用溶胶-凝胶法对SDR转盘表面进行催化剂的负载,并对负载后的SDR进行光催化降解含酚废水的研究。考察了溶剂、加水量、抑制剂等因素对胶凝时间的影响,得出了制备催化剂薄膜的适宜条件为:n(钛)∶n(水)∶n(乙醇)∶n(盐酸)∶n(冰醋酸)=1∶2∶13.56∶0.05∶1,随后采用XRD、SEM对薄膜进行了表征,结果显示负载的催化剂为粒度分布均匀的锐钛矿型TiO_2。进一步研究了SDR中H_2O_2、UV/H_2O_2、UV/TiO_2、UV/H_2O_2/TiO_2等4种条件下苯酚的降解率和后2种情况下苯酚的矿化率的对比。结果表明:H_2O_2/TiO_2光催化氧化30 min苯酚降解率达到100%,与UV/H_2O_2氧化条件下相比,完全降解时间缩短了30 min,与UV/TiO_2氧化相比,苯酚降解率有大幅度提高;UV/H_2O_2/TiO_2催化氧化条件下2 h的矿化率为89%,较UV/H_2O_2光氧化条件下提高28%。 相似文献
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高级氧化技术控制消毒副产物生成势的研究进展 总被引:1,自引:0,他引:1
饮用水消毒副产物生成势(DBPsFP)及前体物的控制问题一直以来都是饮用水研究领域的热点,而近年来在饮用水中频繁检出的一些更高毒性的新型含氮消毒副产物,更引发了研究者的广泛关注。高级氧化技术是一类能高效降解饮用水中天然有机物等消毒副产物前体物的水处理方法。本文全面阐述了UV/H2O2、TiO2光催化氧化、O3/H2O2、催化臭氧氧化、O3/UV、Fenton法及类Fenton法等高级氧化技术控制DBPsFP的研究进展,并根据现有高级氧化技术控制DBPsFP研究中的一些不足之处,提出了DBPsFP高级氧化处理领域今后研究的主要方向和需解决的问题。 相似文献
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《水处理技术》2016,(5)
采用UV/H_2O_2和UV/TiO_2两种工艺降解磺胺甲噁唑(SMX),确定了H_2O_2和TiO_2的最佳投加量,在保持最佳投加量的条件下研究了SMX初始浓度、反应溶液初始pH、叔丁醇投加量对两种方法降解SMX效果的影响,为研究两种方法在降解SMX过程中的矿化程度测定了TOC的去除情况。结果表明,两种方法都对SMX具有较好的去除效果,整体而言UV/H_2O_2对SMX的降解速率高于UV/TiO_2;UV/H_2O_2的降解速率更易受到SMX初始浓度、反应溶液初始pH的影响;UV/H_2O_2对SMX的降解过程中·OH的氧化作用和UV直接降解都是去除SMX的主要作用,而UV/TiO_2中UV直接降解和空穴直接氧化是去除SMX的主要作用。 相似文献
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《应用化工》2016,(5):815-819
采用高级氧化技术-紫外/双氧水(UV/H_2O_2)和紫外/过硫酸盐(UV/PS)工艺降解磺胺吡啶(SPY)。研究表明,紫外与氧化剂(H_2O_2、PS)联用可显著提高去除率,其反应符合拟一级动力学模型。目标污染物磺胺吡啶的去除率在一定浓度内随着氧化剂H_2O_2和PS浓度升高而升高;磺胺吡啶初始浓度越大,反应速率越小;UV/H_2O_2工艺降解磺胺吡啶最大去除率发生在p H=3,而UV/PS工艺降解SPY在p H=11时去除率最大;Na Cl会抑制UV/H_2O_2和UV/PS工艺对目标污染物的降解,而适当的Na HCO_3可促进降解反应的进行;腐植酸对UV/PS工艺产生抑制作用,低浓度腐植酸(≤1 mmol/L)对UV/H_2O_2工艺则有促进作用。 相似文献
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《应用化工》2022,(5):815-819
采用高级氧化技术-紫外/双氧水(UV/H_2O_2)和紫外/过硫酸盐(UV/PS)工艺降解磺胺吡啶(SPY)。研究表明,紫外与氧化剂(H_2O_2、PS)联用可显著提高去除率,其反应符合拟一级动力学模型。目标污染物磺胺吡啶的去除率在一定浓度内随着氧化剂H_2O_2和PS浓度升高而升高;磺胺吡啶初始浓度越大,反应速率越小;UV/H_2O_2工艺降解磺胺吡啶最大去除率发生在p H=3,而UV/PS工艺降解SPY在p H=11时去除率最大;Na Cl会抑制UV/H_2O_2和UV/PS工艺对目标污染物的降解,而适当的Na HCO_3可促进降解反应的进行;腐植酸对UV/PS工艺产生抑制作用,低浓度腐植酸(≤1 mmol/L)对UV/H_2O_2工艺则有促进作用。 相似文献
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饮用水中微囊藻毒素去除技术 总被引:3,自引:0,他引:3
微囊藻毒素是从蓝藻中释放出的一种肝毒素,可导致人类、家畜和野生动物的死亡。水中藻毒素的去除有多种方法,但常规水处理工艺对其去除率较低,一般在50%以下,有时甚至出现负去除率。物理法、化学法、光催化氧化法及生物法等对藻毒素的去除效果较好,去除率一般可达90%以上,考虑到处理效果和运行的经济性,以光催化氧化法和生物法较为适宜。 相似文献
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K. K. Tintula A. Jalajakshi A. K. Sahu S. Pitchumani P. Sridhar A. K. Shukla 《Fuel Cells》2013,13(2):158-166
A composite of mesoporous carbon (MC) with poly(3,4‐ethylenedioxythiophene) (PEDOT) is studied as catalyst support for platinum nanoparticles. The durability of commercial Pt/carbon and Pt/MC‐PEDOT as cathode catalyst is investigated by invoking air‐fuel boundary at the anode side so as to foster carbon corrosion at the cathode side of a polymer electrolyte fuel cell (PEFC). Pt/MC‐PEDOT shows higher resistance to carbon corrosion in relation to Pt/C. Electrochemical techniques such as cyclic voltammetry (CV) and impedance measurements are used to evaluate the extent of degradation in the catalyst layer. It is surmised that the resistance of MC‐PEDOT as catalyst support toward electrochemical oxidation makes Pt/MC‐PEDOT a suitable and stable cathode catalyst for PEFCs. 相似文献
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Chlorinated organic compounds, especially chlorophenols are well-known water priority pollutant family due to their toxicity and potential health hazard. As biological treatment processes for the degradation of chlorinated phenols have not been effective, various technologies and processes such as activated carbon adsorption[1], chemical oxidation[2], have been conventionally attempted for phenolic waster treatment. Recently, advanced oxidation processes (AOPs) have attracted a great deal of attention for treatment of phenolic wastewater, among these chemical oxidation ultraviolet (UV) oxidation system[3], anodic oxidation and indirect electro-oxidation have been widely studied[4]. Though a number of researchers worked on the degradation of chlorophenol by UV radiation or electrochemical processes, there are few reports on both methods for organic wastewater treatment. If these two processes can operate in harmony, the degradation efficiency would be enhanced. 相似文献
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Microbial cellulose as a support for photocatalytic oxidation of toluene using TiO2 nanoparticles 下载免费PDF全文
The aim of this study was to investigate the feasibility of toluene degradation using impregnated microbial cellulose (MC) with titanium dioxide (TiO2) nanoparticles (MC/TiO2). The effects of the initial toluene concentration and ultraviolet (UV) source on the degradation efficiency of toluene have been evaluated. The experimental results showed that the rate of toluene degradation decreased with an increasing of the inlet toluene concentration. After 40 min reaction time, the decomposition rate (%) of toluene decreased from 72.3% to 36.02% for experiments conducted at 100 and 500 ppm, respectively. The degradation efficiency of toluene decreased with application of UVA source instead of UVC source. The toluene degradation efficiency (%) reached to 87.79% and 76.87% for UVC and UVA irradiation, respectively. At initial toluene concentration of 100 mg/L, toluene degradation efficiency for photocatalysis and photolysis processes were 70.2% and 10.65%, respectively; indicating that the photocatalytic degradation efficiency is significantly higher than that of photolytic degradation efficiency. Furthermore, photocatalytic degradation kinetics of toluene was studied and the rates of degradation were found to conform to pseudo‐second‐order kinetic. As shown in the present study, impregnation of TiO2 nanoparticles on MC/TiO2 significantly increases toluene removal for short exposure time. It can be concluded that the MC acted as a local toluene concentrator by adsorbing pollutants from the air stream, and thereby diffusing them to the TiO2 nanoparticles for photodegradation. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43051. 相似文献
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A review of the effects of dye-assisting chemicals on advanced oxidation of reactive dyes in wastewater 总被引:2,自引:0,他引:2
Idil Arslan-Alaton 《Coloration Technology》2003,119(6):345-353
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《Catalysis Today》2005,99(1-2):15-22
After a brief summary of the main aspects concerning the formation and ignition of flammable mixtures, attention is given mainly to: (i) the identification of risk location in oxidation processes; (ii) how homogeneous phenomena may affect the products distribution in heterogeneously catalyzed gas-phase oxidations; (iii) how the flow regime in the oxidation reactor can affect the flammability limits of the process gas; (iv) the preventive measures for minimizing selectivity degradation and maximizing safety in oxidation processes. 相似文献