Role of activated carbon in the photocatalytic degradation of 2,4-dichlorophenoxyacetic acid by the UV/TiO2/activated carbon system

2012 ◽  
Vol 126 ◽  
pp. 100-107 ◽  
Author(s):  
J. Rivera-Utrilla ◽  
M. Sánchez-Polo ◽  
M.M. Abdel daiem ◽  
R. Ocampo-Pérez
Keyword(s):  
Activated Carbon ◽  
Photocatalytic Degradation ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Carbon System

scholarly journals Photocatalytic degradation of the 2,4-dichlorophenoxyacetic acid herbicide using supported iridium materials

2021 ◽  
Vol 12 (1) ◽  
pp. 125-134
Author(s):  
Claudia Patricia Castañeda Martínez ◽  
Ignacio Alfonso Alvarado Ortega ◽  
Hugo Alfonso Rojas Sarmiento ◽  
Francisco Javier Tzompantzi Morales ◽  
José Ricardo Gómez Romero
Keyword(s):  
Photocatalytic Degradation ◽  
Band Gap Energy ◽  
Charge Carriers ◽  
Dichlorophenoxyacetic Acid ◽  
Impregnation Method ◽  
Wet Impregnation ◽  
Improved Performance ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Wet Impregnation Method

In this work, the effect of the addition of iridium on TiO2 and Nb2O5 supports obtained by wet impregnation method was evaluated in the photocatalytic degradation of 2,4-dichlorophenoxiacetic acid under UV irradiation. The synthetized materials were analyzed by different techniques in order to determinate their physicochemical properties. In general, it was observed that the addition of iridium modifies the surface area, band gap energy and it enhances the crystallinity of the materials. Besides, an increase in the photoactivity in the degradation of the herbicide was evidenced using the materials modified. However, the Ir/TiO2 photocatalyst possess the best photocatalytic behavior toward the degradation and possible mineralization of the herbicide. The improved performance of the photocatalyst could be argued by the role of the iridium particles as electron collectors favoring the effective separation of the charge carriers and, as consequence, increasing the degradation of the molecule.           

The role of a metabolic intermediate in the biodegradation of inhibitory substrates

1997 ◽  
Vol 36 (10) ◽  
pp. 27-36 ◽  
Author(s):  
P. Mungkarndee ◽  
S. M. Rao Bhamidimarri ◽  
A. J. Mawson ◽  
R. Chong
Keyword(s):  
The Other ◽  
Metabolic Product ◽  
Dichlorophenoxyacetic Acid ◽  
Mutual Inhibition ◽  
Metabolic Intermediate ◽  
Batch Cultures ◽  
Ortho Cresol ◽  
2,4 Dichlorophenoxyacetic Acid

Biodegradation of the mixed inhibitory substrates, 2,4-dichlorophenoxyacetic acid (2,4-D) and para-chloro-ortho-cresol (PCOC) was studied in aerobic batch cultures. Each substrate added beyond certain concentrations inhibited the degradation of the other. This mutual inhibition was found to be enhanced by 2,4-dichlorophenol (2,4-DCP) which is an intermediate metabolic product of 2,4-D. When 2,4-DCP accumulated to approximatelY 40 mg/l degradation of all compounds in the mixed 2,4-D and PCOC substrate system was completely inhibited. The degradation of 2,4-D and PCOC individually was also found to be inhibited by elevated concentrations of 2,4-DCP added externally, while PCOC inhibited the utilization of the intermediate.

Preparation of mesoporous activated carbon from palm-date pits: optimization study on removal of bentazon, carbofuran, and 2,4-D using response surface methodology

2013 ◽  
Vol 68 (7) ◽  
pp. 1503-1511 ◽  
Author(s):  
J. M. Salman ◽  
F. M. Abid
Keyword(s):  
Activated Carbon ◽  
Influential Factor ◽  
Dichlorophenoxyacetic Acid ◽  
Activation Time ◽  
Carbon Yield ◽  
Activation Temperature ◽  
Variable Parameters ◽  
Carbon Dioxide Co2 ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Date Pits

Palm-date pits were used to prepare activated carbon by physiochemical activation method, which consisted of potassium hydroxide (KOH) treatment and carbon dioxide (CO2) gasification. The effects of variable parameters, activation temperature, activation time and chemical impregnation ratios (KOH: char by weight) on the preparation of activated carbon and for removal of pesticides: bentazon, carbofuran and 2,4-dichlorophenoxyacetic acid (2,4-D) were investigated. Based on the central composite design (CCD), two factor interaction (2FI) and quadratic models were respectively employed to correlate the effect of variable parameters on the preparation of activated carbon used for removal of pesticides with carbon yield. From the analysis of variance (ANOVA), the most influential factor on each experimental design response was identified. The optimum conditions for preparing activated carbon from palm-date pits were found to be: activation temperature of 850 °C, activation time of 3 h and chemical impregnation ratio of 3.75, which resulted in an activated carbon yield of 19.5% and bentazon, carbofuran, and 2,4-D removal of 84, 83, and 93%, respectively.

Herbicide-Induced Ethylene Production: Role of the Gas in Sublethal Doses of 2,4-D

Weed Science ◽  
1968 ◽  
Vol 16 (4) ◽  
pp. 498-500 ◽  
Author(s):  
F. B. Abeles
Keyword(s):  
Carbon Dioxide ◽  
Zea Mays ◽  
Glycine Max ◽  
Ethylene Production ◽  
Competitive Inhibitor ◽  
Inhibitory Effect ◽  
Dichlorophenoxyacetic Acid ◽  
Sublethal Doses ◽  
2,4 Dichlorophenoxyacetic Acid

Ethylene production was stimulated by 2,4-dichlorophenoxyacetic acid (2,4-D) from light-grown corn (Zea mays L., var. XL-15) and soybeans (Glycine max Merr., var. Hawkeye). Ethylene had an inhibitory effect on the growth of corn and soybeans, but a reversal of the ethylene effect could not be clearly demonstrated using the competitive inhibitor, carbon dioxide. Ethylene did not mimic the ability of 2,4-D to cause growth curvatures. It was concluded that ethylene played a role in the activity of sublethal amounts of 2,4-D.

Adsorption of 2,4-Dichlorophenoxyacetic Acid on Granular Activated Carbon

2020 ◽  
Vol 54 (1) ◽  
pp. 54-60
Author(s):  
S. A. Kulaishin ◽  
M. D. Vedenyapina ◽  
L. R. Sharifullina ◽  
A. L. Lapidus
Keyword(s):  
Activated Carbon ◽  
Granular Activated Carbon ◽  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid
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