scholarly journals Controlled Growth of LDH Films with Enhanced Photocatalytic Activity in a Mixed Wastewater Treatment

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 807 ◽  
Author(s):  
Zhongchuan Wang ◽  
Pengfei Fang ◽  
Parveen Kumar ◽  
Weiwei Wang ◽  
Bo Liu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Environmental Remediation ◽  
High Photocatalytic Activity ◽  
Manufacturing Cost ◽  
Transport Pathways ◽  
Layer Spacing ◽  
Double Hydroxides

Due to multiple charge transport pathways, adjustable layer spacing, compositional flexibility, low manufacturing cost, and absorption of visible light, layered double hydroxides (LDHs) are a promising material for wastewater treatment. In this study, LDH films and Fe-doped LDH films with different metal ions (Ni, Al, Fe) on the surface of conductive cloth were successfully prepared and applied for the photocatalytic degradation of wastewater containing methyl orange and Ag ions under visible-light irradiation. The chemical state of Fe ions and the composition of LDHs on methyl orange photodegradation were investigated. The experimental results showed that LDH films exhibited high photocatalytic activity. The photocatalytic activity of LDH films on methyl orange improved in the mixed wastewater, and the Fe-doped NiAl–LDH films exhibited best visible-light photocatalytic performance. The analysis showed that Ag ions in the mixed wastewater were reduced by the LDH films and subsequently deposited on the surface of the LDH films. The Ag nanoparticles acted as electron traps and promoted the photocatalytic activity of the LDH films on methyl orange. Thus, we have demonstrated that prepared LDH films can be used in the treatment of mixed wastewater and have broad application prospects in environmental remediation and purification processes.

Visible-Light Driven LaNiO3 Nanosized Photocatalysts Prepared by a Sol-Gel Process

2011 ◽  
Vol 279 ◽  
pp. 83-87 ◽  
Author(s):  
Pei Song Tang ◽  
He Sun ◽  
Feng Cao ◽  
Jin Tian Yang ◽  
Sheng Liang Ni ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Light Absorption ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Visible Light Absorption ◽  
Average Grain Size ◽  
Sol Gel Process

The LaNiO3 nanoparticles were prepared by a sol-gel process. The LaNiO3 nanoparticles were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflectance spectroscopy (DRS). XRD and SEM demonstrate the successful synthesis of single phase perovskite LaNiO3 and an average grain size of 80 nm in diameter. It was found that the as-prepared LaNiO3 shows strong visible-light absorption with absorption onset of 545 nm, indicating a narrow optical band gap of 2.28 eV. Consequently, LaNiO3 nanoparticles show high visible-light photocatalytic activity for decomposition of methyl orange in comparison with the commercial Degussa P25. The photocatalytic experiment shows the high photocatalytic activity for the decomposition of methyl orange under visible-light irradiation, which is attributed to the strong visible-light absorption.

Facile preparation of semimetallic MoP2 as a novel visible light driven photocatalyst with high photocatalytic activity

2015 ◽  
Vol 3 (19) ◽  
pp. 10360-10367 ◽  
Author(s):  
Tianli Wu ◽  
Shijian Chen ◽  
Dingke Zhang ◽  
Junke Hou
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Visible Light Driven ◽  
Facile Preparation

In this work, semimetallic MoP2 nanoparticles are discovered as a new photocatalyst to efficiently degenerate methyl orange and produce H2 from water under visible light irradiation.

Photocatalytic Activity of TiO2-C Composites under the Visible Light

2009 ◽  
Vol 610-613 ◽  
pp. 310-315
Author(s):  
Jin Huo Li ◽  
De Gui Zhu ◽  
Zong Yue Xue ◽  
Shuang Quan Guo
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
High Photocatalytic Activity ◽  
Ultraviolet Region ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Nano Tio2 ◽  
Light Region

TiO2-C composites of high photocatalytic activity were in-situ fabricated with nano-TiO2 powders and resins. The composites were characterized by differential scanning calorimetry and thermal gravimetric analysis (DSC-TG), X-ray diffraction (XRD), UV-Vis diffuse reflection spectrum (DRS), transmission electron microscope (TEM) and scan electronic microscopy (SEM). XRD results indicated that the composites consist of carbon and anatase phases. UV-Vis DRS showed that composites not only have a good performance in the ultraviolet region, but also have a very good performance in the visible light region. Photocatalysis degradations of methyl orange with purity nano-TiO2 and TiO2-C composite were tested by lighting of visible light. After methyl orange liquid was lighted by visible light for 1 hour, the decolorization ratio of methyl orange can be up to 96.3%( reactive brilliant red X-3B:98.7%) with TiO2-C powders, while it was only 34.7% (reactive brilliant red X-3B:66.9%) with purity nano-TiO2 powders. In-situ fabricated carbon can change the width of energy band of TiO2 and adsorb methyl orange and reactive brilliant red X-3B molecules. The former accelerate the absorption of visible light, and the later raise the decomposition rate of methyl orange and reactive brilliant red X-3B. All of these can improve photocatalytic activity of TiO2-C composites under the visible light.

Facile Synthesis of r-GO @Pd/TiO2 Nanocomposites and Its Photocatalytic Activity Under Visible Light

2016 ◽  
Vol 16 (4) ◽  
pp. 3557-3563 ◽  
Author(s):  
Anh Quang Dao ◽  
Bijuan Zheng ◽  
Hongwei Liu ◽  
Shuang Dong ◽  
Thanh Tuyen Le Thi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Catalytic Efficiency ◽  
Average Crystallite Size ◽  
High Photocatalytic Activity ◽  
Synthesis Conditions

Reduced Graphene Oxide Wrapped Pd/TiO2 (r-GO@Pd/TiO2) which exhibited high photocatalytic activity under visible light was synthesized from commercial chemicals. The classic sol–gel method and the Ar gas bubbling composition was used in the preparation of the catalyst. Furthermore, the best Pd-doping concentration in crystals, the wrapping concentration of r-GO over nanoparticles, and the optimal calcination temperature were investigated to enhance the photocatalytic activity of the hybrid catalyst. The experimental results showed that the catalytic efficiency of r-GO@Pd/TiO2 reached maximum value at the optimum synthesis conditions: 0.7 wt% Pd-doped TiO2 by sol–gel process, calcination temperature of 550 °C, 1 mg of GO for 100 gram wrapped Pd/TiO2. X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) techniques were conducted to determine the nanostructure of the catalysts. The average crystallite size of nanoparticles was 14 nm with perfect dispersion of Pd dots and wraps of r-GO membrane. Methyl Blue was used as an organic dye model to test the ability in wastewater treatment of the catalysts. A comparison between different catalysts’ characteristics was also studied. The r-GO@Pd/TiO2 showed a higher photocatalytic activity compared to Pd/TiO2 and commercial P25. Additionally, the complete dye reduction under visible light excitation indicated that wrapping r-GO round Pd/TiO2 improved the photocatalytic activity of catalysts. The determination of the stability of r-GO@Pd/TiO2 showed that its photocatalysis was persistent over several times of recycling examination. Therefore, r-GO@Pd/TiO2 in wastewater treatment.

A Novel Magnetically Separable Photocatalyst Silver Vanadate@ SiO2/Fe3O4

2011 ◽  
Vol 356-360 ◽  
pp. 455-458
Author(s):  
Long Hui Nie ◽  
Ya Peng Meng ◽  
Bo Rui Yang ◽  
Zheng Qiang Xiao ◽  
Lei Fang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Hydrothermal Process ◽  
High Photocatalytic Activity ◽  
Main Phase ◽  
Prepared Sample ◽  
Silver Vanadate ◽  
Magnetically Separable ◽  
Degradation Of Methyl Orange

A magnetically separable photocatalyst silver vanadates@SiO2/Fe3O4was prepared by hydrothermal process. The prepared sample was composed of mixed phases of a–Ag3VO4and Ag4V2O4, and the main phase was a–Ag3VO4. The bandgap of the synthesized sample was 2.2 eV. In the degradation of methyl orange (MO) solution under the visible light (l>420 nm), the silver vanadates@SiO2/Fe3O4showed high photocatalytic activity in two-cycle photocatalytic test.

Synthesis of Visible-Light-Driven Photocatalyst Ag3PO4 by a Precipitation-Replacement Method

2011 ◽  
Vol 382 ◽  
pp. 435-438
Author(s):  
Long Hui Nie ◽  
Zheng Qing Huang ◽  
Wang Xi Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
High Photocatalytic Activity ◽  
Cubic Crystals ◽  
Replacement Method ◽  
Replacement Process ◽  
Visible Light Driven ◽  
Degradation Of Methyl Orange

A visible-light-driven photocatalyst Ag3PO4 was prepared by a novel precipitation- replacement process. The synthesized sample was cubic crystals with the bandgap of 2.16 eV. And most of the particles size was among 0.5~2 mm. The Ag3PO4 shows high photocatalytic activity for the degradation of methyl orange (MO) solution under the visible light (l>420 nm). The apparent ratio constant (kapp) value of Ag3PO4 was about 239 and 50 times that of P25 and C-TiO2, respectively.

Preparations and Photocatalytic Properties of Visible-Light-Active Nitrogen-Doped TiO2

2012 ◽  
Vol 568 ◽  
pp. 364-367
Author(s):  
Yan Hong Li ◽  
Dong Dong Tan ◽  
De Fu Bi ◽  
Wei Lu ◽  
Shi Hong Xu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
High Photocatalytic Activity ◽  
Active Nitrogen ◽  
Simple Method ◽  
Nitrogen Doped ◽  
Tin Nanoparticles ◽  
Visible Light Active ◽  
Degradation Of Methyl Orange

A visible-light-active N-TiO2photocatalyst was prepared by a simple method: TiN nanoparticles were calcined in the O2/N2atmosphere. The prepared N-TiO2shows high photocatalytic activity for the degradation of methyl orange in water under visible light irradiation. The photodegradation results indicate that the prepared photocatalysts have the best photocatalytic activity when TiN was calcined at 650 °C for 15 min in the O2/N2atmosphere with 1:15 (volume) of O2/N2.

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