光催化深度净化处理染料废水

采用絮凝初级处理与光催化深度净化复合的方法处理染料皂黄废水,研究絮凝剂PAC用量、TiO2用量、反应时间等因素对皂黄处理效果的影响。实验结果表明,絮凝剂用量增加到一定程度时,皂黄的脱色率几乎不变;光催化单独作用可以使染料完全脱色,但需要较长的反应时间。在100 mL皂黄溶液中,当絮凝剂用量为50 mg,TiO2用量为5.0 mg,反应进行到10 min时皂黄的脱色率就达到76.1%。絮凝-光催化复合方式处理染料皂黄大大提高了脱色效率。     

复合半导体光催化降解糖蜜废水研究

以溶胶－凝胶法制备了TiO₂和TiO₂复合半导体粉末,并将之用于糖蜜废水的光催化处理。通过实验考察了催化剂用量、糖蜜废水的浓度、光催化反应时间以及复合半导体对于糖蜜废水脱色率的影响。结果表明,用复合半导体降解糖蜜废水具有理想的处理效果。催化剂最佳用量为（2.7～4.0） g·L^－1,随着反应时间的进行,糖蜜废水脱色率开始时显著增加,后渐趋于平衡。 各种复合半导体中,5%SnO₂/TiO₂光催化处理糖蜜废水的效果最佳,原水样稀释20倍后,反应120 min的脱色率可达61.75％。     

有机污染物的脱色率与COD值的关系研究

采用阳极氧化法制备了TiO2纳米管阵列电极,采用场发射扫描电子显微镜(FESEM)和X-射线衍射(XRD)对电极的表面形貌和晶型进行了表征,并以其为阳极对模拟染料废水甲基橙(MO)和亚甲基蓝(MB)溶液进行电化学氧化降解。研究了MB溶液的电化学氧化降解反应动力学,考察了MO和MB溶液脱色率与COD值之间的关系。结果表明,MB溶液在TiO2纳米管阵列电极表面发生电化学氧化降解反应动力学为一级反应;MO和MB溶液的脱色率与其COD值之间均呈良好的线性关系,可通过测定溶液脱色率来了解COD值的去除情况。     

BiOI/ZIF-8复合材料的制备及光催化性能

利用低温液相沉淀法制备BiOI/ZIF-8复合光催化剂,同时研究ZIF-8复合量对催化活性和反应动力学的影响,采用X射线衍射(XRD)、高分辨透射电镜(HRTEM)、紫外-可见漫反射(UV-Vis DRS)等研究手段对样品进行表征.通过在可见光下降解甲基橙(MO),对其光催化性能进行评价.结果 表明,BiOI/ZIF-8复合光催化剂具有较好的光催化性能,并且当复合量为3％时复合材料光催化降解性能最好,可见光照射60 min后对质量浓度为40 mg/L的MO溶液的降解率达到99.5％.     

TiO2光催化降解有机染料的动力学研究

以灿烂绿和伊红-Y为研究对象,探讨了其在254 nm紫外光照条件下Ti O2光催化降解的影响因素以及光催化反应的动力学模型。研究结果表明,随着催化剂Ti O2投加量的增加以及反应时间的增长,两种染料的脱色率均随之升高。而增大两种染料溶液的起始浓度,两种染料的脱色率会随之下降。此外,p H值对于这两种染料的光催化降解影响十分明显。灿烂绿和伊红-Y的Ti O2光催化降解均符合准一级Langmuir-Hinshelwood方程。     

SnWO4/g-C3N4复合光催化剂降解亚甲基蓝溶液

采用溶剂热法制备SnWO_4/g-C_3N_4复合光催化剂,在可见光降解亚甲基蓝实验中研究复合催化剂的光催化性能。考察催化剂投加量、亚甲基蓝溶液初始浓度、溶液pH值、盐效应对光催化性能的影响及SnWO_4/g-C_3N_4复合光催化剂的重复利用性。实验结果表明,在催化剂投加量1.0 g·L~(-1)、亚甲基蓝溶液初始浓度15 mg·L~(-1)和溶液pH值7.08时,在可见光条件下反应3 h,亚甲基蓝溶液脱色率达到94.2%;NaCl对光催化降解亚甲基蓝具有抑制作用,加入10 mmol·L~(-1)的NaCl溶液后亚甲基蓝的脱色率降为76.0%;复合光催化剂循环使用5次后,暗吸附后光照3 h,亚甲基蓝溶液的总脱色率仍可达到78.7%,重复利用性良好。     

混凝与光催化联用处理水体中的复合染料

利用混凝与光催化处理酸性橙Ⅱ染料水样、碱性嫩黄O染料水样以及酸性橙Ⅱ与碱性嫩黄O复合染料水样,确定最佳的混凝剂投药量和pH。对比分析单一方法与联用技术的脱色性能,判断联用技术是否优于单一方法;并探究pH、光催化时间、盐含量、浊度等对脱色性能的影响。结果表明：不同的染料水样,所需的最佳脱色条件不同。处理复合染料水样时,混凝剂最佳投加量为920mg/L,最佳pH为6,经过120min的光催化脱色率可达到78.92%。混凝与光催化联用技术的脱色性能明显优于单一混凝法或光催化法,这与所处理的染料分子结构密切相关。较高的离子强度及浊度会降低混凝剂对染料的吸附电中和与吸附桥连能力,并对光催化剂的表面效应产生抑制,从而降低混凝与光催化联用技术的脱色性能。复合染料水样的盐含量为1200mg/L时,脱色率降幅可达36.87%;浊度为412.2NTU时,脱色率降幅为19.85%。     

WO_3/BiOBr光催化剂催化降解甲基橙溶液

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。     

NO3-光催化脱色染料废水的研究

染料工业废水在排放前必须加以处理.光催化在染料废水处理方面显示了巨大的应用优势.研究试验在NO3-存在下用紫外灯照射对甲基橙溶液进行光催化脱色.结果表明:随着NO3-含量的逐渐增加,甲基橙脱色率逐渐增加,在实验范围内没有出现NO3-加入量的最佳值;甲基橙在酸性条件下的脱色率高于碱性条件下的脱色率;当甲基橙质量浓度≤25...     

BT-04复合混凝剂应用于活性染料印染废水的脱色研究

本文研究了BT-04复合混凝剂混凝处理活性染料模拟废水和实际印染废水的效果，考察了药剂投量、pH值对处理效果的影响。研究结果表明，在较低的投药量情况下可获得良好的脱色率和cOD去除率。pH值对脱色效果有一定的影响，在pH值5-6的范围内，可取得最佳脱色效果。在相同的投量下，比PAC—PDMDAAC复合混凝剂脱色率高。     

可见光驱动溴化银/溴氧化铋复合纳米 材料制备及活性评价*

室温沉淀法合成溴氧化铋（BiOBr）纳米片,然后通过离子交换法制备溴化银/溴氧化铋（AgBr/BiOBr）复合纳米材料,采用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）及紫外可见分光光度计（UV-Vis）对其进行表征,并进行了光催化降解实验。以节能、绿色的LED灯为可见光光源,AgBr/BiOBr复合材料光催化降解罗丹明B（RhB）和甲基橙（MO）的效率均高于BiOBr。AgBr/BiOBr降解RhB的活性强于MO。在AgBr/BiOBr光催化系统中,超氧自由基和空穴是主要的活性物种。不同pH条件下,AgBr/BiOBr对RhB均表现出理想的光催化降解效果,酸性条件下降解效率最佳;碱性环境下AgBr/BiOBr光催化降解MO的活性最高。经过循环利用,AgBr/BiOBr可见光催化活性呈现出一定程度的降低,归因于降解过程中产生了金属银。     

Preparation, characterization and photocatalytic behavior of WO3-fullerene/TiO2 catalysts under visible light

WO3-treated fullerene/TiO2 composites (WO3-fullerene/TiO2) were prepared using a sol-gel method. The composite obtained was characterized by BET surface area measurements, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, transmission electron microscopy, and UV-vis analysis. A methyl orange (MO) solution under visible light irradiation was used to determine the photocatalytic activity. Excellent photocatalytic degradation of a MO solution was observed using the WO3-fullerene, fullerene-TiO2, and WO3-fullerene/TiO2 composites under visible light. An increase in photocatalytic activity was observed, and WO3-fullerene/TiO2 has the best photocatalytic activity; it may attribute to the increase of the photo-absorption effect by the fullerene and the cooperative effect of the WO3.     

碳纳米管负载磷掺杂TiO_2的溶胶-凝胶法合成及其光催化性能研究

采用溶胶-凝胶法,以钛酸丁酯为前驱体,次磷酸为磷源,碳纳米管为载体,制备了P-TiO2-CNTs复合光催化剂。采用XRD、SEM、TEM、UV-Vis/DRS对复合光催化剂的晶体结构、光谱吸收性质等进行了表征。选取甲基橙为目标降解物,考察了P-TiO2-CNTs的可见光光催化活性。结果表明,掺杂一定量的P并负载于适量CNTs上,可以显著提高TiO2的光催化活性,拓宽其光响应范围。     

Photocatalytic activity of TiO2 supported on multi-walled carbon nanotubes under simulated solar irradiation

TiO₂ particles supported on multi-walled carbon nanotubes (MWCNTs) were prepared using a sol–gel method to investigate their photocatalytic activity under simulated solar irradiation for the degradation of methyl orange (MO) in aqueous solution. The prepared composites were analyzed using XRD, SEM, EDS and UV–vis absorption spectroscopy. The results of this study indicated that there was little difference in the shape and structure of MWCNTs/TiO₂ composite and pure TiO₂ particles. The composite exhibited enhanced absorption properties in the visible light range compared to pure TiO₂. The degradation of MO by MWCNTs/TiO₂ composite photocatalysts was investigated under irradiation with simulated solar light. The results of this study indicated that MWCNTs played a significant role in improving photocatalytic performance. Different amounts of MWCNTs had different effects on photodegradation efficiency, and the most efficient MO photodegradation was observed for a 2% MWCNT/TiO₂ mass ratio. Photocatalytic reaction kinetics were described using the Langmuir–Hinshelwood (L–H) model. The photocatalyst was reused for eight cycles, and it retained over 95.2% photocatalytic degradation efficiency. Possible decomposition mechanisms were also discussed. The results of this study indicated that photocatalytic reactions with TiO₂ particles supported on MWCNTs under simulated solar light irradiation are feasible and effective for degrading organic dye pollutants.     

Graphene modified Nd/TiO2 photocatalyst for methyl orange degradation under visible light irradiation

A novel nanoscale GR–Nd/TiO₂ composite photocatalyst was synthesized by the hydrothermal method. Its crystal structure, surface morphology, chemical composition and optical properties were studied using XRD, TEM, and XPS, DRS and PL spectroscopy. It was found that graphene and neodymium modification shifts the absorption edge of TiO₂ to visible-light region. The results of photoluminescence (PL) emission spectra show that GR–Nd/TiO₂ composites possess better charge separation capability than do Nd/TiO₂ and pure TiO₂. The photocatalytic activity of prepared samples was investigated by degradation of methyl orange (MO) dye under visible light irradiation. The results show that the GR–Nd/TiO₂ composite can effectively photodegrade MO, showing an impressive photocatalytic activity enhancement over that of pure TiO₂. The enhanced photocatalytic activity of the composite catalyst might be attributed to the large adsorptivity of dyes, extended light absorption range and efficient charge separation due to Nd doping and graphene incorporation.     

Preparation of hydrophobic SiO<Subscript>2</Subscript>@(TiO<Subscript>2</Subscript>/MoS<Subscript>2</Subscript>) composite film and its self-cleaning properties

TiO₂/MoS₂ composite was encapsulated by hydrophobic SiO₂ nanoparticles using a sol–gel hydrothermal method with methyltriethoxysilane (MTES), titanium tetrachloride (TiCl₄), and molybdenum disulfide (MoS₂) as raw materials. Then, a novel dual functional composite film with hydrophobicity and photocatalytic activity was fabricated on a glass substrates via the combination of polydimethylsiloxane adhesives and hydrophobic SiO₂@(TiO₂/MoS₂) composite particles. The influence of the mole ratios of MTES to TiO₂/MoS₂ (M:T) on the wettability and photocatalytic activity of the composite film was discussed. The surface morphology, chemical compositions, and hydrophobicity of the composite film on the glass substrate were investigated by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and water contact angle (water CA) measurements. The results indicated that the composite film exhibited stable superhydrophobicity and excellent photocatalytic activity for degradation of methyl orange (MO) even after five continuous cycles of photocatalytic reaction when M/T was 7:1. The water CA and degradation efficiency for MO remained at 154° and 94%, respectively. Further, the composite film showed a good non-sticking characteristic with the water sliding angle (SA) at about 4°. The SiO₂@(TiO₂/MoS₂) composite consisting of hydrophobic SiO₂ nanoparticles and TiO₂/MoS₂ heterostructure could provide synergistic effects for maintaining long-term self-cleaning performance.     

Preparation of titanium dioxide/tungsten disulfide composite photocatalysts with enhanced photocatalytic activity under visible light

Titanium dioxide/tungsten disulfide (TiO₂/WS₂) composite photocatalysts were fabricated via a one-step hydrothermal synthesis process, using TiCl₄ as titanium source and bulk WS₂ as sensitizer. The morphology, structure, specific surface area and optical absorption properties of the composite photocatalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), specific surface area analyzer and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), respectively. The photocatalytic activity of as-prepared photocatalysts was evaluated by the degradation of methyl orange (MO) under illumination of 500W Xenon lamp. The results indicated that TiO₂/WS₂ composite photocatalysts possessed excellent photocatalytic activity, and ～95% of the degradation rate for MO was reached when molar ratio of WS₂ to TiO₂ was 0.004 and the irradiation time was 60 min. Moreover, the carrier trapping experiment and fluorescence spectra showed that ·O ₂ ^? was the key component in the photocatalytic degradation process and O₂ was reduced to be ·O ₂ ^? by the electrons from the conduction band of TiO₂ and WS₂ for the degradation of MO.     

静电自组装制备海泡石负载纳米TiO2复合光催化材料研究

选用一维孔结构的海泡石矿物为载体,以TiCl4为钛源,采用静电自组装方法制备了海泡石负载纳米TiO2复合光催化材料.利用X射线衍射(XRD)、红外光谱(IR)和扫描电子显微镜(SEM)等分析方法对材料的结构及微观形貌等进行了表征.通过对甲基橙染料的溶液脱色降解来评价材料的光催化性能,考察了焙烧温度、硅烷偶联剂用量等对材...     

钕和镨共掺杂TiO2光催化性能的研究

采用溶胶—凝胶法制备纯纳米TiO2、钕和镨掺杂的纳米TiO2光催化剂,以甲基橙为目标降解物,研究了催化剂加入量、染料初始质量浓度、溶液pH值对甲基橙降解率的影响.实验结果表明,钕掺杂的纳米TiO2光催化活性高于纯纳米TiO2的光催化活性,而适量钕镨共掺杂纳米TiO2光催化活性可进一步提高,最佳掺杂浓度为0.5％的钕和0.2％的镨.当钕和镨共掺杂纳米TiO2催化剂加入量为2.0g/L,甲基橙溶液的初始质量浓度为30 mg/L,pH值为10.5时,在40 W紫外灯光照射35 min后降解率最好,可达到93％.     

Synthesis of MoS2/g-C3N4 as a solar light-responsive photocatalyst for organic degradation

A novel molybdenum disulfide (MoS₂) and graphitic carbon nitride (g-C₃N₄) composite photocatalyst was synthesized using a low temperature hydrothermal method. MoS₂ nanoparticles formed on g-C₃N₄ nanosheets greatly enhanced the photocatalytic activity of g-C₃N₄. The photocatalyst was tested for the degradation of methyl orange (MO) under simulated solar light. Composite 3.0 wt.% MoS₂/g-C₃N₄ showed the highest photocatalytic activity for MO decomposition. MoS₂ nanoparticles can increase the interfacial charge transfer and thus prevent the recombination of photo-generated electron–hole pairs. The novel MoS₂/g-C₃N₄ composite is therefore shown as a promising catalyst for photocatalytic degradation of organic pollutants using solar energy.