Abstract
The photocatalytic degradation of picloram (4-amino-3,5,6-trichloro-2-pyridincarboxylic acid), which is one of popular acidic herbicide, was investigated with the existence of titanium oxide (TiO2) under sunlight. The total photocatalytic degradation of 20 ppm of picloram was occurred within 30 min irradiation with TiO2, while a negligible degradation was found without TiO2 under sunlight. The influence of various parameters, like TiO2 dosage, solution initial pH, intensity of light, reaction temperature and irradiation time, was found during the photocatalytic degradation of picloram. The mineralization of picloram was proved by the deterioration of total organic carbon (TOC) of the photocatalytic process. The pseudo–first order kinetics of photocatalytic degradation was obtained according to the Langmuir–Hinshelwood model, and the reaction rate constant was 17.6 × 10−2 min−1. Chloride ion, ammonium ion, nitrate ion and CO2 were erected as the final products after completing the photocatalytic degradation of picloram. The intermediate products could not be determined by the GC–MS during the degradation of picloram. Therefore, the degradation mechanism of the picloram was proposed based on the frontier electron density and the point charge at each atom of the picloram molecule. The photocatalytic degradation method, using sunlight, may develop into as a pragmatic technique to purify picloram contaminated wastewater.
Highlights
Picloram (4-amino-3,5,6-trichloro-2-pyridincarboxylic acid) is a systemic translocation-possible and hormone herbicide used to control the annual and perennial broadleaf plant such as mugwort, dockweeds, thistles, bramble and Japanese Knotweed, which are normally found in pasture and rangelands [1]
The various parameters, for example, TiO2 dosage, solution pH, reaction temperature, intensity of sunlight and irradiation time have been amended for the highest photocatalytic degradation of the picloram
The same absorption peak was found in the absence of TiO2 after 10 min of solar irradiation
Summary
Picloram (4-amino-3,5,6-trichloro-2-pyridincarboxylic acid) is a systemic translocation-possible and hormone herbicide used to control the annual and perennial broadleaf plant such as mugwort, dockweeds, thistles, bramble and Japanese Knotweed, which are normally found in pasture and rangelands [1]. The photocatalytic degradation of the picloram with. The current research manifests the photocatalytic degradation of picloram in aqueous solution. The various parameters, for example, TiO2 dosage, solution pH, reaction temperature, intensity of sunlight and irradiation time have been amended for the highest photocatalytic degradation of the picloram. ExpvearriimouesnptalraSmeectteiros,nfor example, TiO2 dosage, solution pH, reaction temperature, intensity of sunlight and irradiation time have been amended for the highest photocatalytic degradation of the. The solid-phase extraction gas chromatography and mass spectroscopy (GC-MS) were used to determine the intermediate products, which are obtained during the degradation of picloram. A Shimadzu gas chromatography mass spectroscopy (GCMS-QP5000, Shimadzu, Kyoto, Japan) was furnished with a CP-Sil 8 CB capillary column.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
