Sunlight photocatalytic activity of CdS modified TiO2 loaded on activated carbon fibers

Zhao, Wenxia; Zhang, Bai; Ren, Ailing; Guo, Baolin; Wu, Can

doi:10.1016/j.apsusc.2009.12.062

Cited by 151 publications

(67 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The band gap energy (Eg) of the samples was measured by the wavelength values corresponding to the intersection point of the vertical and horizontal parts of the spectra, using the equation [26].…”

Section: Uv-drs Analysismentioning

confidence: 99%

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Prabu¹

2017

IJRASET

View full text Add to dashboard Cite

INTRODUCTION Dyes are widely used in textile, rubber, paper, plastic and cosmetic industries. They discharge high amount of dyes into the water bodies every day [1] and nowadays, this has become one of the most serious environmental problems. Methylene blue (MB) is the cationic dye commonly used for coloring. It is generally used for dyeing cotton, wool, and silk. MB can cause eye burns and irritation to the skin in humans and animals and if ingested, can cause irritation to the gastrointestinal tract, nausea, vomiting, and diarrhea [2]. Rhodamine B is a basic dye widely used as a colorant in textiles and food materials and as biological stains in biochemical laboratories at high concentrations. It causes irritation to skin, eyes and respiratory tract if ingested by animals and human beings [3]. Photocatalysis, an advanced oxidation technology employing semiconductors as photocatalysts, is a promising method for treatment of contaminated ground, surface, and wastewater containing various organic pollutants [4][5][6][7]. Various semiconductors such as ZnO [8], CdS [9] and TiO2 [10] have been used as photocatalysts. Among them, ZnO has become very well established in photocatalytic approaches as well as in the environmental catalysis area [11]. ZnO is a semiconductor with a wide band gap (3.3 eV), large exciton binding energy. It is abundant in nature and environment friendly. These characteristics make this material attractive for many applications such as solar cells, optical coatings, photocatalysts, antibacterial materials, electrical devices, active medium in UV semiconductor lasers and in gas sensors [12]. The photocatalytic activity of ZnO was recently recognized to be comparable with TiO2 and has received much attention because of its high photosensitivity and stability in degrading various toxic substances [11]. The mechanism of photocatalytic reaction is based on the generation of electron-hole pairs. When a photocatalyst is illuminated, the photo-excited electron migrates from the valence band (VB) to the conduction band (CB) and holes are formed in valence band; these holes can generate hydroxyl radicals, which are highly reactive and oxidizing in nature [13]. Activated carbon (AC) is a nontoxic and low cost adsorbent used for the removal of pollutants such as dyes and heavy metals from the waste water due to its high surface area, porous structure, large adsorption capacity and fast adsorption kinetics [14,15]. Composites consisting of ZnO supported on activated carbon have shown remarkable results in inhibiting bacteria growth [16] and removing metals from aqueous solutions [17]. Present study reports the photocatalytic performance of ZnO nanoparticles supported on cotton stalk activated carbon towards degradation of Methylene blue and Rhodamine B under sunlight irradiation. Activated carbon was prepared from cotton stalk by chemical activation using phosphoric acid as activating agent. ZnO photocatalyst and ZnO loaded activated carbons (ZnO/CSACs) were synthesised by chemical precipitation and were...

show abstract

Section: Uv-drs Analysismentioning

confidence: 99%

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Prabu¹

2017

IJRASET

View full text Add to dashboard Cite

show abstract

“…Over the last few decades, some researchers have paid attention to biomass-based activated carbon fibers (Asakura et al 2004;Okabe et al 2005;Senthilkumaar et al 2005;Phan et al 2006;Tan et al 2007;Zhao et al 2010). However, biomass constituents such as cellulose and lignin have been used only to a relatively minor extent.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Nano-TiO2 Loaded Bamboo-based Activated Carbon Fibers by H2O Activation

Li¹,

Ma²,

Li³

et al. 2013

BioResources

View full text Add to dashboard Cite

As the support for loading TiO 2 , bamboo-based activated carbon fibers (BACFs) were obtained from Phyllostachys pubescens Mazel after liquefaction using phenol, melt-spinning, curing carbonization, and H 2 O activation. TiO 2 /BACFs were prepared by the sol-gel method and characterized by SEM, XRD, FTIR, and XPS. Anatase TiO 2 film with high photocatalytic activity was formed on the surface of BACFs, and the average crystallite size of the TiO 2 film was 17 to 30 nm. The characteristic absorbance peaks of anatase TiO 2 were observed at 1402 and 541 to 605 cm -1 on the infrared spectrum of TiO 2 /BACFs. The surface of TiO 2 /BACFs was mainly comprised of C-C, C-O, C=O, and Ti-O bonds. With increased calcination temperature, the contents of element Ti and Ti-O bonds of lattice oxygen on the surface of TiO 2 /BACFs increased and then decreased. The degradation rate of TiO 2 /BACFs for methylene blue (MB) solution reached more than 98% after 7 h of UV illumination.

show abstract

“…Much work on the TiO 2 -mediated heterogeneous photocatalysis as a successful and convenient alternative to the conventional methods for the treatment of wastewater containing organic pollutants has been reported so far [1]. Titanium dioxide (TiO 2 ) has advantages over other photocatalysts, such as good stability, high activity, little harmfulness to humans, easy availability, and low cost [5,6]. Therefore, titanium dioxide is photocatalysts of choice for degradation of drugs, pesticides, organics dyes, and air pollutants [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of Carbon Monolith/TiO₂Composite

Maletić

Vukčević

Kalijadis

et al. 2015

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The new and simple approach for deposition of catalytically active TiO 2 coating on carbon monolith (CM) carrier was presented. CM photocatalysts were impregnated with TiO 2 using titanium solution and thermal treatment, and their photocatalytic activity was investigated in the process of methylene blue (MB) photodegradation. For the purpose of comparison, CM composite photocatalysts were prepared by dip-coating method, which implies binder usage. The presence of TiO 2 on CM carrier was confirmed by Raman spectroscopy and scanning electron microscopy. The sorption characteristics of CM and the role of adsorption in the overall process of MB removal were evaluated through amount of surface oxygen groups obtained by temperatureprogrammed desorption and specific surface area determined by BET method. CM has shown good adsorption properties toward MB due to high amount of surface oxygen groups and relatively high specific surface area. It was concluded that photocatalytic activity increases with CM disc thickness due to increase of MB adsorption and amount of deposited TiO 2 . Good photocatalytic activity achieved for samples obtained by thermal treatment is the result of better accessibility of MB solution to the TiO 2 particles induced by binder absence.

show abstract

Sunlight photocatalytic activity of CdS modified TiO2 loaded on activated carbon fibers

Cited by 151 publications

References 27 publications

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Preparation and Characterization of Nano-TiO2 Loaded Bamboo-based Activated Carbon Fibers by H2O Activation

Photocatalytic Performance of Carbon Monolith/TiO₂Composite

Contact Info

Product

Resources

About

Sunlight photocatalytic activity of CdS modified TiO2 loaded on activated carbon fibers

Cited by 151 publications

References 27 publications

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Enhanced Photocatalytic Performance of ZnO Loaded Cotton Stalk Activated Carbon Composite on MB and RHB Dyes Under Sunlight Irradiation

Preparation and Characterization of Nano-TiO2 Loaded Bamboo-based Activated Carbon Fibers by H2O Activation

Photocatalytic Performance of Carbon Monolith/TiO2Composite

Contact Info

Product

Resources

About

Photocatalytic Performance of Carbon Monolith/TiO₂Composite