A feasibility study of dechlorination of chloroform in water by ultrasound in the presence of hydrogen peroxide

Chen, Jau Ren; Xu, Xue‐Wen; Lee, Arthur S; Yen, Teh Fu

doi:10.1080/09593339009384930

Cited by 27 publications

(10 citation statements)

References 13 publications

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“…To increase the extent of reduction in the toxicity, hybrid methods constituting two or more individual techniques have been developed. Some of these include, for example, ultrasound/hydrogen peroxide (H 2 O 2 ) or ultrasound/ozone, ultraviolet light (UV)/H 2 O 2 or UV/ozone, ozone/H 2 O 2 , sonophotocatalytic oxidation, photo‐Fenton processes, and catalytic oxidation processes (Benitez et al, 1996, 1997; Chen et al, 1990; Echigo et al, 1996; Engwall et al, 1999; Fallmann et al, 1999; Fung et al, 1999; Gulyas et al, 1995; Guttoneau et al, 1990; Kang and Hoffmann, 1998; Kang et al, 1999) The present work reviews the technique of sonophotocatalytic oxidation in detail. The initial part of this article is concentrated on the basic understanding of the individual techniques of sonochemical oxidation and photocatalytic oxidation, whereas the later part discusses the window of synergism available for the hybrid operation.…”

Section: Introductionmentioning

confidence: 99%

Sonophotocatalytic reactors for wastewater treatment: A critical review

2004

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Section: Introductionmentioning

confidence: 99%

Sonophotocatalytic reactors for wastewater treatment: A critical review

2004

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“…As the weight of the catalyst increased, the quantity of photons adsorbed increased and consequently the decolourisation rate increased [28], Hence, optimisation of the catalyst loading for a given dye concentration is an important parameter to avoid excess catalyst and to ensure total absorption of light either UV or visible light for efficient photodecolourisation.…”

Section: Effect Of Catalyst Weightmentioning

confidence: 99%

Detoxification of Carcinogenic Dyes by Noble Metal (Ag, Au, Pt) Impregnated Titania Photocatalysts

Thiripuranthagan¹,

Rupa²

2019

Gold Nanoparticles - Reaching New Heights

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Textile industries produce large quantities of waste water which is notoriously known to contain strong colour, suspended solids and COD. Although several treatment processes, such as filtration, coagulation, oxidation, ozonation, reverse osmosis, etc., have been practiced for many decades, they all have inherent limitations. They transfer the harmful pollutants from one phase to another and do not address detoxification. Semiconductor photocatalysis is a promising technique for photodegradation of hazardous chemicals found in waste waters. Among various semiconductors, TiO 2 has been studied widely. However, the main drawbacks associated with TiO 2 are (i) large band gap (Eg > 3.2 eV) (only UV active) and (ii) recombination of excitons. Dye sensitisation, coupling of semiconductors, and transitional metal doping are some of the methods reported to shift its optical response to visible region. Herein, nanoparticles of different noble metals such as Ag, Au and Pt were deposited on synthesised TiO 2 , characterized by XRD, TEM, FT-IR, BET, UV-Vis and AAS and were subjected to the degradation of some textile dyes namely Tartrazine (TAZ), Reactive Yellow-17 (RY-17) and Reactive Black-5 (RB-5) under both UV and visible irradiations. The reaction conditions such as catalyst concentration, dye concentration, pH, irradiation time, light intensity, and additives were optimized for complete decolourisation and discussed.

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“…The ultrasound method has been used for heavy oil upgrading to crack the high molecular weight asphaltene into low molecular weight oil (8)(9), as well as for the dechlorination of trihalocarbons in water (10). The results are very promising and may lead to some novel petroleum recovery techniques (11).…”

Section: Approach For the Feasibility Studiesmentioning

confidence: 99%

A Recovery Process for Spent Polyurethane-Based Propellants

Shiu

Yang

Yen

et al. 1995

ACS Symposium Series

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The valuable inorganic components-energetics and fuel-of solid propellants are successfully separated and recovered by using swelling and ultrasound. In this study, the inert polyurethane-based propellant is first comminuted in various solvents as swelling media, and an appropriate solvent is then selected. Subsequently an ultrasound induced cavitational reaction for interfacial treatment is performed with the use of a mild oxidant. Through the process, the polymer binders are partially degraded and the propellant network is destroyed, enabling inorganic and metallic constituents to be released and separated.To meet military need, solid composite propellants have been extensively developed and manufactured in the past. Following the end of the cold war, these large quantities of propellants from the demilitarization of missiles brought about the urgency of safe propellant disposal. While noted for their high energy release arid explosion, the spent propellants become hazardous wastes and need to be disposed with caution. In compliance to the Resources Conservation and Recovery Act (RCRA) and EPA regulations, the conventional and primary disposal method of spent propellant-open-pit burning-is no longer legal. These stringent environmental regulations and uprising pollution concerns have prompted the study of the recovery process for spent propellants.To recover the useful inorganic components from the spent propellant, the most common methods of breaking the polyurethane backbone macro-structure under vigorous conditions, such as thermal and hydrolytic cleavage, are not applicable. Currently, several techniques are actively being pursued by different groups. These include: aqueous maceration and extraction of propellant by Thiokol, cryogenic washout by General Atomic, and ammonia extraction at supercritical or near-supercritical conditions by Hercules. In addition to these, alternative methods leading to a mild recovery process are being sought.

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A feasibility study of dechlorination of chloroform in water by ultrasound in the presence of hydrogen peroxide

Cited by 27 publications

References 13 publications

Sonophotocatalytic reactors for wastewater treatment: A critical review

Sonophotocatalytic reactors for wastewater treatment: A critical review

Detoxification of Carcinogenic Dyes by Noble Metal (Ag, Au, Pt) Impregnated Titania Photocatalysts

A Recovery Process for Spent Polyurethane-Based Propellants

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