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采用水热法制备WO_3/BiOBr复合光催化剂,以甲基橙为目标污染物,分别考察了催化剂用量、甲基橙溶液初始浓度、pH值及盐效应等对复合光催化剂光催化降解甲基橙性能的影响,并通过循环使用实验,考察复合光催化剂的稳定性。结果表明,在催化剂用量为2.0 g·L~(-1)、甲基橙初始浓度为20 mg·L~(-1)和溶液pH=6.2的条件下光照反应2 h,甲基橙脱色率可达99.39%;溶液中的Na Cl对降解有抑制作用;催化剂重复使用4次后,对甲基橙的脱色率仍可达74.77%,表明复合光催化剂有良好的光催化活性和稳定性。 相似文献
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采用水热法结合高温热处理制备Ag-Zn_3(VO_4)_2光催化剂,研究催化剂在可见光下降解甲基橙溶液的性能,并考察催化剂用量、甲基橙溶液初始浓度、pH值、盐效应和H_2O_2用量对光催化性能的影响,评价Ag-Zn_3(VO_4)_2光催化剂的重复使用性能。结果表明,在催化剂用量2.0 g·L~(-1)、甲基橙溶液初始浓度20 mg·L~(-1)和溶液pH=6.2条件下光照反应5 h,甲基橙溶液脱色率可达99.18%,Na_2SO_4对光催化降解甲基橙起抑制作用,且随着溶液中盐浓度增加,抑制作用更明显。H_2O_2在一定浓度范围可促进光催化降解甲基橙,100 mL甲基橙溶液中30%H_2O_2加入量为1.0 mL时,甲基橙溶液脱色率可提高21.68个百分点。催化剂重复使用5次后,光照5 h的甲基橙溶液脱色率仍可达到75.99%。 相似文献
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《化学工程师》2021,35(7)
采用自组装法,以十六烷基三甲基溴化胺、Bi(NO_3)_3和纯氮化碳为原料制取g-C_3N_4/Bi_2O_2CO_3复合材料,考察了其在LED光照射下,不同甲基橙初始浓度、催化剂摩尔配比、催化剂用量、实验时间等因素对光催化降解甲基橙的影响。通过设计单因素实验以及正交实验优化降解条件。结果表明,在甲基橙初始浓度为15mg·L~(-1)、催化剂摩尔配比为1∶1、复合材料用量为2.0g·L~(-1)、实验时间70min时,降解率最高可达到91.13%。并对该反应进行了动力学研究,结果表现为该反应满足一级反应的动力学特征,其动力学反应方程为:lnc=-0.0795t+2.595。 相似文献
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采用水热合成法制备C_3N_4-BiVO_4复合光催化剂,以甲基橙为目标污染物,研究催化剂用量、甲基橙溶液初始浓度和pH值、NaCl用量对甲基橙脱色率的影响,并通过C_3N_4-BiVO_4复合光催化剂的循环使用实验,考察其重复使用性能。结果表明,在甲基橙初始浓度20 mg·L~(-1)、复合光催化剂用量3.0 g·L~(-1)及弱酸性条件下,光照反应6 h,目标污染物甲基橙脱色率达98.81%,溶液中的NaCl对催化剂降解甲基橙有抑制作用。催化剂重复使用5次后,溶液脱色率约80%,表明催化剂性能较稳定,可重复使用。 相似文献
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采用提拉-浸渍法在铟化锡导电玻璃( ITO)表面制备TiO2介孔薄膜,通过X射线衍射分析、透射电镜及N2吸附-脱附等测试对材料进行了表征.结果表明,薄膜材料为高催化活性的锐钛矿型,具有高比表面积(166m2·g-1)和较窄孔径分布(2~10nm).以TiO2/ITO为工作电极,建立三电极光催化体系.结果表明,降解初始质量浓度20mg·L-1的甲基橙光电催化反应中,当pH=2、外加阳极偏电压为0.6V、电解液Na2SO4的浓度为10 mmol·L-1时降解效果好,降解率可达97%. 相似文献
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采用电絮凝法处理甲基橙模拟染料废水,研究了染料脱色的影响因素及其CODCr去除动力学。考察了静置时间、槽电压、极板间距、初始浓度、pH值以及电解质浓度对甲基橙染料脱色效率的影响。结果表明,槽电压为20 V,电流为0.4 A,极板间距为2.5 cm,废水体积为500 ml,甲基橙初始浓度为500 mg·L-1,溶液pH值为3.0,电解质KCl的浓度为0.5 g·L-1时,反应10 min后甲基橙脱色率可达97 %。根据电絮凝的絮凝沉淀理论和氧化反应机理,建立CODCr去除反应动力学模型,模型与实验数据拟合较好。通过模型参数的预测可以揭示甲基橙降解主要以絮凝沉淀为主,氧化降解为辅,同时溶液中二价铁Fe(II)的增加会影响CODCr去除率的下降。 相似文献
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以石墨为阳极、活性炭纤维(ACF)为阴极,电Fenton法氧化降解甲基橙溶液。结果表明,在甲基橙溶液浓度为4 mmol/L、pH值为3、电压为8 V、硫酸亚铁的浓度为0.2 mmol/L、反应时间为60 min时脱色率可达到98.12%,并且甲基橙氧化降解遵循一级反应动力学。 相似文献
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Nitric oxide(NO) removal and sulfur dioxide(SO_2) removal by sodium persulfate(Na_2S_2O_8) were studied in a Bubble Column Reactor. The proposed reaction pathways of NO and SO_2 removal are discussed. The effects of temperatures(35–90 °C), Na_2S_2O_8(0.05–0.5 mol·L~(-1)), Fe SO4(0.5–5.0 m mol·L~(-1)) and H_2O_2(0.25 mol·L~(-1))on NO and SO_2 removal were investigated. The results indicated that increased persulfate concentration led to increase in NO removal at various temperatures. SO_2 was almost completely removed in the temperature range of 55–85 °C. Fe~(2+)accelerated persulfate activation and enhanced NO removal efficiency. At 0.2 mol·L~(-1) Na_2S_2O_8 and 0.5–1.0 mmol·L~(-1) Fe~(2+), NO removal of 93.5%–99% was obtained at 75–90 °C, SO_2 removal was higher than 99% at all temperatures. The addition of 0.25 mol·L~(-1) H_2O_2 into 0.2 mol·L~(-1) Na_2S_2O_8 solution promoted NO removal efficiency apparently until utterly decomposition of H2 O2, the SO_2 removal was as high as98.4% separately at 35 °C and 80 °C. 相似文献
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以苯胺、活性炭为原料,利用原位聚合法制备聚苯胺(PANI)改性活性炭(AC)粒子电极(PANI/AC),采用扫描电子显微镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)和红外光谱(FTIR)对该粒子电极的形貌、晶体结构和组成进行了表征,并将其应用于直接耐晒翠蓝GB的光电催化降解实验。考察了PANI复合量、粒子电极用量、电流密度、pH和GB初始浓度等对降解率的影响,并考察了GB在不同催化条件下的降解反应。结果表明:在光电协同催化条件下,当苯胺与活性炭质量比为0.3∶0.7,粒子电极质量浓度为9 g/L,电流密度为8 mA/cm2,pH为3时,PANI/AC对质量浓度为20 mg/L的GB溶液的降解率达到95.47%。 相似文献
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The saturated vapour pressures are measured as a function of temperature and alkali metal concentration for the liquid solutions Na + NaCl, Na + NaBr, Na + NaI, K + KCl, K + KBr, and K + KI. The sodium and potassium partial pressures are determined. The expressions for their temperature dependence are obtained. Vaporization heats, activity coefficient, partial excess enthalpies and entropies are calculated from the experimental data for sodium and potassium in these solutions. Equations are derived for the redox potential as a function of temperature and the alkali metal concentration in the melts. The cathodic polarization of an iron electrode in molten NaCl, KCl, and NaBr is investigated. The steady-state alkali metal concentration in the cathode layer of the electrolyte is shown to be linear in the current density, varying from ~ 300 to 104 A m?2. The effective alkali metal diffusion coefficients estimated from the linear relation are much greater than the diffusion coefficients of the cations Na+ and K+ in the same molten salts. The cathode potentials are found to become nearly independent of the current density when it exceeds ~ 104 A m?2, the steady-state metal concentration in the cathode layer of the electrolyte being still far from saturated. 相似文献
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以盐酸四环素(TC·HCl)为研究对象,钛基钌铱涂层(IrO2-RuO2/Ti)为阳极,钛板为阴极,电催化氧化降解TC·HCl模拟废水,探讨了初始质量浓度、电流密度、pH、电解质硫酸钠浓度对电催化降解TC·HCl效率的影响。结果表明,电催化氧化可有效降解水中的TC·HCl。提高电流密度,降低TC·HCl初始质量浓度、电解质硫酸钠浓度,可增大TC·HCl去除率。反应的前90 min,pH对去除率无影响,反应90 min后降解效果出现明显差别,pH为3、7和12时,反应300 min去除率分别为92%、100%和72%。降解过程遵循一级反应动力学模型。通过综合各工艺参数下的去除率、能量消耗和电流效率,得出最佳工艺参数为:TC·HCl初始质量浓度300 mg/L、电流密度10 mA/cm2、硫酸钠浓度0.05 mol/L、pH=7,在该条件下反应180 min后TC·HCl去除率达94%。该实验结果为电化学处理制药工业废水提供了基础数据和科学参考。 相似文献
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The corrosion behaviors of simulated archaeological iron in solution (0.06 mol·L^-1 NaCl+0.03 mol·L^-1 Na2SO4+0.01 mol·L^-1 NaHCO3) simulating soil water composition was investigated by potentialdynamic polarization, constant potential polarization, and simulated occluded cell (O.C.) galvanostatic tests. X-ray diffraction (XRD), energy dispersive spectrometry (EDS), and scanning electron microscope (SEM) were used to study the corrosion morphology and the evolution of corrosion product. The objective was to discover the transformation process of archaeological iron, and determine the distribution of chlorinated corrosion products. The results showed that the presence of crevice, cavities, and channels facilitates the localized corrosion under rusts; the autocatalytic effect increases the concentration of Fe^2+, Cl^-, and SO4^2- , and promotes local acidification within the crevices and cavities. Meanwhile, the phase transformation of corrosion products is concluded to proceed by means of two ways. One is that the ferrous ions are transformed into different kinds of FeOOH via the intermediate Fe(Ⅱ)-Fe(Ⅲ) hydroxyl-salt (i.e. Green Rusts); the other is that the Fe^2+ ions are transformed into FeCl2, FeCl3, and orange powders akaganeite at the crevices and cavities. 相似文献
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在Si、Ta、SiC、Ti四种不同的基底上通过热丝化学气相沉积法分别生长了掺硼金刚石(BDD)薄膜。试验对BDD膜层的微观形貌、电极的电化学性能进行了研究。四种基底的BDD电极均具有较宽的电位窗口;Ta—BDD和SiC—BDD晶体形貌完整;Ta—BDD和Ti—BDD具有较好的膜基附着力,具有较长的寿命。试验表明,使用12h后,Ta—BDD与Ti—BDD仍具有良好的电解性能,微观形貌完整,而Si—BDD和SiC—BDD分别使用4h和6h后,膜层便开始脱落。试验测定了Ta—BDD电极对活性艳红X-3B模拟染料废水的降解脱色效果,考察了不同条件(槽电压、电解质浓度、电解质种类及pH)对脱色效果的影响。结果表明:在酸性介质中,当硫酸钠浓度为2.5s/L时,经过120min电解,模拟废水中的染料可脱除至1%以下。NaCl作为支持电解质时,相比于Na2SO4对废水色度的脱除具有更强的作用。 相似文献
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钛基修饰氧化物电极降解敌百虫的研究 总被引:1,自引:0,他引:1
采用高温热氧化法制备了具有较高的电催化活性和良好稳定性的钛基锡锑铅氧化物电极,以有机磷农药敌百虫为目标有机物,考察了电压、电解质加入量、pH值、电解时间等因素对敌百虫降解率和溶液COD的影响.在外加电压为9 V,电解质硫酸钠的质量浓度0.1 mol/L,pH=6,电解100 mg/L的敌百虫模拟废水,2.0 h降解率为87.54%,3.0 h降解率为95.60%,此时溶液的COD去除率达72.58%. 相似文献
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