Continuous flow photocatalytic reactor using ZnO–bentonite nanocomposite for degradation of phenol

Meshram, Satish P.; Limaye, Rohan A.; Ghodke, Shailesh; Nigam, Shachi; Sonawane, Shirish H.; Chikate, Rajeev C.

doi:10.1016/j.cej.2011.07.015

Cited by 107 publications

(39 citation statements)

References 36 publications

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“…Chowdhury et al [7] used slurry photoreactor with dye-sensitized photocatalyst, and Malekshoar et al [5] used slurry photoreactor with graphene-based photocatalyst for phenol degradation under solar light. Studies by other researchers reported degradation of phenols with (i) TiO 2 -coatedfiber-optic cable reactor [16], (ii) tubular photoreactor [49], (iii) continuous flow photoreactor [50], and (iv) solar photoreactor (CPC modules and flat reactor) [51].…”

Section: Photoreactorsmentioning

confidence: 99%

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

Chowdhury¹,

Nag²,

Ray³

2017

Phenolic Compounds - Natural Sources, Importance and Applications

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Phenolic compounds are found in surface and groundwater as well as wastewater from several industries. It is necessary to eliminate phenols and phenolic compounds from contaminated water before releasing into water bodies due to their toxicity to human beings. Photocatalytic degradation seems to be a promising technology for the degradation of several phenolic compounds. Complete mineralization of phenol and phenolic compound has been achieved with TiO 2 -based photocatalysts under both UV and visible-light irradiation. This chapter will evaluate the conventional processes and advanced oxidation processes for the degradation of phenol and phenolic compounds. The process economics and efficiencies of different advanced oxidation processes will also be discussed. The main focus of the chapter is photocatalytic degradation processes under UV and visible light along with a detailed review of several factors affecting degradation of phenol and phenolic compounds. Photocatalytic degradation process is governed by reactions with hydroxyl radical or superoxide ion. The extent of degradation depends on light sources (UV, visible, and solar), the type of photocatalyst, and experimental conditions (pH, photocatalyst dosage, initial concentration of phenolic compounds, light intensity, electron donor concentration, etc.). Visible-light-active photocatalysts are applied by several researchers to exploit sunlight and to make the photocatalysis process sustainable. In the future, using sunlight in place of UV could make photocatalysis economically more efficient.

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Section: Photoreactorsmentioning

confidence: 99%

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

Chowdhury¹,

Nag²,

Ray³

2017

Phenolic Compounds - Natural Sources, Importance and Applications

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“…Silicate adsorbents engineered with photocatalytic ingredients, for example, tailoring the aluminosilicate layers and their surfaces with nanostructured semiconducting photocatalysts, can make them multifunctional composites and heterogeneous catalysts [8]. ZnO/clay system reveals the potential of this composite for various applications [9][10][11][12]. Among clay minerals, the usage of sepiolite as a support material is rarely reported [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

ZnO/Sepiolite Catalysts – Characterization and Photoactivity Measurements

Ökte¹

2016

Advanced Catalytic Materials - Photocatalysis and Other Current Trends

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Sepiolite-supported ZnO catalysts (ZnO-SEP) were prepared and characterized using Xray diffraction (XRD), surface area (BET) measurements, scanning electron microscopy (SEM) with energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectra (UV-vis DRS) techniques. XRD analysis supplied information about the generation of ZnO nanoparticles. SEM images and elemental mapping scans revealed variations in the surface morphology of the SEP after ZnO loading. Supported catalysts possessed higher surface areas and pore volumes in comparison to unsupported catalyst (0.25 M ZnO). They also revealed suitable band-gap energies in the UV-A region. XPS analysis confirmed the build-up of ZnO nanoparticles on the SEP matrix with the form of Zn 2+ oxidation state. Photocatalytic performances were evaluated in terms of methyl orange (MO) decolorization process following pseudo-first-order kinetics. The repeatability of photocatalytic activity was also tested.

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“…One of the important natural minerals is the bentonite, which consists mainly of montmorillonite and contains varying amounts of other minerals like quartz and feldspar. The structure and swelling properties of Na-bentonite provide it with exceptional rheological properties that allow its dispersions to be widely used in different industrial applications, such as in drilling muds [1], [2], dyes, pharmaceuticals [3], paper, cement [4], nanocomposites [5], [6], polymer composites [7], thermal insulators [8] and ceramics [9].…”

Section: Introductionmentioning

confidence: 99%

The Modification of Rheological Properties of Bentonite-Water Dispersions with Cationic and Anionic Surfactants

Abu-Jdayil¹,

Ghannam²,

Nasser³

2016

IJCEA

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Abstract-In the use of bentonite in different industrial applications, different additives are recommended to optimize the rheological properties of the formulation. In this study, the effect of anionic surfactant sodium dodecyl sulfate (SDS) and cationic surfactant cetyltrimethyl ammonium bromide (CTAB) on the rheological properties of Na-bentonite suspensions was investigated in the concentration range of . × − − . × − M. The SDS surfactant was effective in modifying the rheological behavior of bentonite dispersion in the concentration range that corresponds to critical micelle concentration (CMC) and critical coagulation concentrations (CCC) of SDS. On the other hand, the addition of CTAB surfactant to bentonite suspension reduced significantly its viscosity and shifted its behavior from shear thinning with a yield stress toward Newtonian.

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Continuous flow photocatalytic reactor using ZnO–bentonite nanocomposite for degradation of phenol

Cited by 107 publications

References 36 publications

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

Degradation of Phenolic Compounds Through UV and Visible- Light-Driven Photocatalysis: Technical and Economic Aspects

ZnO/Sepiolite Catalysts – Characterization and Photoactivity Measurements

The Modification of Rheological Properties of Bentonite-Water Dispersions with Cationic and Anionic Surfactants

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