Photochemical reactions of a few selected pesticide derivatives and other priority organic pollutants in aqueous suspensions of titanium dioxide

2007 ◽  
Vol 265 (1-2) ◽  
pp. 231-236 ◽  
Author(s):  
M. Abu Tariq ◽  
M. Faisal ◽  
M. Muneer ◽  
D. Bahnemann
Keyword(s):  
Titanium Dioxide ◽  
Organic Pollutants ◽  
Photochemical Reactions ◽  
Aqueous Suspensions

Titanium Dioxide-mediated Photocatalysed Mineralization of Two Selected Organic Pollutants in Aqueous Suspensions

2013 ◽  
Vol 16 (2) ◽  
Author(s):  
Khalid Umar ◽  
M. M. Haque ◽  
Niyaz A. Mir ◽  
M. Muneer ◽  
I. H. Farooqi
Keyword(s):  
Titanium Dioxide ◽  
Organic Pollutants ◽  
Hplc Analysis ◽  
Irradiation Time ◽  
Atmospheric Oxygen ◽  
Model Compounds ◽  
Aqueous Suspensions ◽  
Analysis Technique ◽  
Mineralization Kinetics ◽  
Kinetics Of

AbstractTitanium dioxide-mediated photocatalytic mineralization of two selected organic pollutants such as Metalaxyl (ML) and Tinidazole (TN) has been investigated in aqueous suspensions in the presence of atmospheric oxygen under a variety of conditions. The mineralization was studied by monitoring the depletion in total organic carbon (TOC) content as a function of irradiation time. In addition HPLC analysis technique was also used to monitor the degradation of model compounds under investigations. The mineralization kinetics of both compounds were investigated under different conditions such as type of TiO

Semiconductor-Mediated Photocatalysed Degradation of Various Pesticide Derivatives and Other Priority Organic Pollutants in Aqueous Suspensions

2005 ◽  
Vol 486-487 ◽  
pp. 61-64
Author(s):  
Detlef W. Bahnemann ◽  
M. Muneer ◽  
M. Qamar ◽  
M.A. Rahman ◽  
H.K. Singh
Keyword(s):  
Titanium Dioxide ◽  
Organic Carbon ◽  
Organic Pollutants ◽  
Spectroscopic Analysis ◽  
Vibrio Fischeri ◽  
Degradation Kinetics ◽  
Irradiation Time ◽  
Aqueous Suspensions ◽  
Degradation Rates ◽  
Hplc Technique

The photocatalysed degradation of various selected pesticide derivatives, namely N,NDimethyl- a-phenyl benzene acetamide (Diphenamid) [1], 1,2-diethyl phthalate (DEP) [2], 5-bromo- 3-sec.butyl-6-methyl uracil (Bromacil) [3], 3-tert-butyl-5-chloro-6-methyluracil (Terbacil), 2,4,5- tribromoimidazole (TBI) [4], Methoxychlor, Chlorothalonil and Disulfoton [5] as well as that of two selected priority organic pollutants, namely benzidine and 1,2-diphenyhydrazine (DPH) [6], has been investigated in aqueous suspensions of titanium dioxide (TiO2) under a variety of conditions. The degradation was studied by monitoring the change in substrate concentration employing UV spectroscopic analysis or HPLC technique and the decrease in total organic carbon (TOC) content, respectively, as a function of irradiation time. The degradation kinetics was studied under different conditions such as reaction pH, substrate and photocatalyst concentration, type of photocatalysts and the presence of alternative additives such as H2O2, KBrO3 and (NH4)2S2O8 besides molecular oxygen. The degradation rates and the photonic efficiencies were found to be strongly influenced by the above parameters. A toxicity test was performed for irradiated samples of few selected systems measuring the luminescence of bacteria Vibrio fischeri after 30 minutes of incubation.

Iron(III) Phthalocyanine-Modified Titanium Dioxide:  A Novel Photocatalyst for the Enhanced Photodegradation of Organic Pollutants

1998 ◽  
Vol 102 (47) ◽  
pp. 9397-9403 ◽  
Author(s):  
Koodali T. Ranjit ◽  
Itamar Willner ◽  
Stefan Bossmann ◽  
André Braun
Keyword(s):  
Titanium Dioxide ◽  
Organic Pollutants

Simultaneous photochemical generation of ozone in the gas phase and photolysis of aqueous reaction systems using one VUV light source

1997 ◽  
Vol 35 (4) ◽  
pp. 41-48 ◽  
Author(s):  
T.M. Hashem ◽  
M. Zirlewagen ◽  
A. M. Braun
Keyword(s):  
Gas Phase ◽  
Light Source ◽  
Organic Pollutants ◽  
Vacuum Ultraviolet ◽  
Oxidative Degradation ◽  
Reaction System ◽  
Photochemical Reactions ◽  
Experimental Conditions ◽  
Photochemical Generation ◽  
Kinetics Of

A more efficient use of vacuum ultraviolet (VUV) radiation produced by an immersed Xe-excimer light source (172 nm) was investigated for the oxidative degradation of organic pollutants in aqueous systems. All emitted VUV radiation from one light source was used in two simultaneous but separate photochemical reactions: (1) photochemical generation of ozone by irradiating oxygen in the gas phase and (2) photolysis of the aqueous reaction system. The gas stream containing the generated ozone is sparged into the reaction system, thus enhancing the oxidative degradation of organic pollutants. The photochemically generated ozone in the gas phase was quantitatively analyzed, and the kinetics of the degradation of 4-chlorophenol (4-CP) and of the dissolved organic carbon (DOC) were determined under different experimental conditions. The results show that the rates of degradation of the substrate and of the DOC decrease in the order of the applied processes, VUV/O3 > O3 > VUV.

A novel system for producing photocatalytic titanium dioxide-coated fibers for decomposing organic pollutants in water

2011 ◽  
Vol 32 (1) ◽  
pp. 42-51 ◽  
Author(s):  
Vandri Ahmad Isnaeni ◽  
Osi Arutanti ◽  
Euis Sustini ◽  
Hasniah Aliah ◽  
Khairurrijal ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Organic Pollutants

Photocatalytic Degradation of Bisphenol A in Aqueous Suspensions of Titanium Dioxide

2012 ◽  
Vol 29 (7) ◽  
pp. 630-637 ◽  
Author(s):  
Chenzhong Jia ◽  
Yanxin Wang ◽  
Caixiang Zhang ◽  
Qiaoyan Qin ◽  
Shuqiong Kong ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Bisphenol A ◽  
Photocatalytic Degradation ◽  
Aqueous Suspensions

scholarly journals Synthesis of a benzyl-grafted alginate derivative and its effect on the colloidal stability of nanosized titanium dioxide aqueous suspensions for Pickering emulsions

RSC Advances ◽  
2018 ◽  
Vol 8 (60) ◽  
pp. 34397-34407 ◽  
Author(s):  
Meixi Feng ◽  
Chuanhai Gu ◽  
Chaoling Bao ◽  
Xiuqiong Chen ◽  
Huiqiong Yan ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Adsorption Energy ◽  
Colloidal Stability ◽  
Pickering Emulsions ◽  
High Adsorption ◽  
Aqueous Suspensions ◽  
Nanosized Titanium Dioxide ◽  
Gravity Sedimentation ◽  
Spontaneous Aggregation

TiO2 nanoparticles (nano-TiO2) easily undergo spontaneous aggregation and gravity sedimentation ascribed to their high adsorption energy, which significantly restrict their actual applications.

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