Photolytic dechlorination of 4-chlorophenol in O2-saturated aqueous solutions in the absence of photocatalysts or additives using ArF∗ (193 nm) and KrF∗ (248 nm) excimer lasers

Thomas, Vernard R. Jr.; Schreiner, A. F.; Xie, Tianyan; Chen, Chen-Loung; Gratzl, Josef S.

doi:10.1016/1010-6030(95)04088-w

Cited by 14 publications

(3 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the case of 4-CP photodegradation, a previous study carried out by the authors using GC-MS analysis shows that two major photoproducts, benzoquinone (BQ) and hydroquinone (HQ), are formed [37]. Also, small amounts of others hydroxylated compounds, such as phenol, catechol, resorcinol, 1,2,4-trihydroxybenzene and even some chlorinated oxidation by-products, such as 4-chlorocatechol, and products from the cleavage of the aromatic ring, such as phthalic acid, have been identified [37][38][39].…”

Section: Introductionmentioning

confidence: 98%

Comparison of alternative treatments for 4-chlorophenol removal from aqueous solutions: Use of free and immobilized soybean peroxidase and KrCl excilamp

Gómez

Matafonova

Batoev

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 98%

Comparison of alternative treatments for 4-chlorophenol removal from aqueous solutions: Use of free and immobilized soybean peroxidase and KrCl excilamp

Gómez

Matafonova

Batoev

et al. 2009

Journal of Hazardous Materials

View full text Add to dashboard Cite

“…The deethylation of RhB, mentioned in section 3.3, might take place at C-N of the chromophoric group with resulting ·R 1 and ·CH 2 CH 3 . ·R 1 would continue to absorb 185 nm photons and generate fragments of ·I i (i = 1, 2,…, n) radicals, which subsequently collided together and formed oligomers [18]. These oligomers could be regarded as the main source of the precipitate produced under the 185 nm irradiation of MWUVL.…”

Section: Degradation Mechanismmentioning

confidence: 99%

Photodegradation of rhodamine B dye using a microwave electrodeless UV lamp (MWUVL)

Huang

Shao

et al. 2007

Front. Chem. China

View full text Add to dashboard Cite

The photodegradation of organic dye rhodamine B (RhB) in an aqueous solution was studied using a microwave electrodeless UV lamp (MWUVL). The 185 nm vacuum UV (VUV) intensity of the MWUVL amounted to 12% of the total UV output, about 1.7 times as high as that of the con ventional low-pressure mercury lamp. An acidic condition was preferred for the degradation of RhB. Precipitate was generated during RhB degradation when the initial concentration of RhB solution was above 60 mg · L −1 . For 100 mg · L −1 RhB at pH 4.0, the mass of precipitate produced was nearly half of the initial amount of RhB in the solution after irradi ation for 75 min. The corresponding degradation ratio of RhB reached up to 99.4% and COD reduced 77.4%. The photo degradation of RhB is mainly achieved by direct photolysis of RhB by 185 nm and OH radical oxidation.Keywords microwave electrodeless UV lamp (MWUVL), photodegradation, 185 nm, rhodamine B (RhB), direct photolysis 2 Experimental 2.1 Chemicals Rhodamine B (RhB) dye of analytical grade (see structure given in Fig.

show abstract

“…During the photolytic process of AR-213 dye using 207 nm radiation, it was suggested that AR-213 degradation was attributable to direct photolysis rather than oxidative degradation by active radicals. The reasons were the following: First, H 2 O was not a source for HO • radicals since photon absorption by H 2 O at wavelength ≥193 nm could be negligible (Thomas Jr, 1995). The oxidative degradation by HO • radicals was excluded in the case as there were no other additional oxidants.…”

Section: Degradation Mechanismmentioning

confidence: 99%

Investigation of 207 nm UV radiation for degradation of organic dye in water

Feng¹,

Zhu²,

Hou³

2007

WSA

View full text Add to dashboard Cite

The photo-degradation of organic dye C.I. Acid Red 213 (AR-213) was achieved by 207 nm UV radiation emitted from a planar KrBr * excimer lamp without addition of oxidants at varying initial pH values. Precipitates were found to be generated when the irradiated solution of initial acid pH was adjusted to alkaline pH and they would disappear again when the solution was readjusted to acidic conditions. The efficiency of COD removal was greatly increased after the filtration of precipitates. Both the decolourisation rate and the COD removal rate reached the maximum in the initial pH 2.8 solution. The same phenomenon was also observed for other kinds of dyes. Direct photolysis was the only pathway in degrading dye molecules for both O 2 -saturated and N 2 -saturated solutions. The by-products formed for initial acidic solution were were identified by electro-spray ionisation (ESI) in positive mode and the influence of initial pH on the reaction mechanism of the dye under 207 nm radiation was analysed.

show abstract

Photolytic dechlorination of 4-chlorophenol in O2-saturated aqueous solutions in the absence of photocatalysts or additives using ArF∗ (193 nm) and KrF∗ (248 nm) excimer lasers

Cited by 14 publications

References 41 publications

Comparison of alternative treatments for 4-chlorophenol removal from aqueous solutions: Use of free and immobilized soybean peroxidase and KrCl excilamp

Comparison of alternative treatments for 4-chlorophenol removal from aqueous solutions: Use of free and immobilized soybean peroxidase and KrCl excilamp

Photodegradation of rhodamine B dye using a microwave electrodeless UV lamp (MWUVL)

Investigation of 207 nm UV radiation for degradation of organic dye in water

Contact Info

Product

Resources

About