Efficient removal of carbofuran by sono-photo active CdS@MIL based Ti Framework

Abstract

The misuse of pesticides is resulted in their deposition in the soil, plants and animals which consequently affecting the environment's pollution and constitute a potential risk to human beings. Cadmium sulfide (CdS) has an efficient band gap which resulted in the trapping of electron and consequently preventing the recombination of photogenerated radical species (electron/hole). The current approach is considered with the in-situ nucleation of CdS directly over MIL-125-NH2 to obtain CdS@MIL-125-NH2, that was sequentially applied for removal of carbofuran pesticide by sono-photocatalytic degradation. The electron microscope declared that spherical agglomerated CdS was densely covered MIL-125-NH2 framework. Catalytic degradation of carbofuran in presence of the prepared materials was systematically investigated by sonolysis, photolysis and sono-photolysis. The degradation of carbofuran was followed the first order model. The catalyzation of CdS@MIL-125-NH2 by daylight was much efficient rather than ultrasonic. By applying CdS@MIL-125-NH2, the degradation amount of carbofuran reached 331.5 mg/g, 630.0 mg/g and 738.0 mg/g for sonolytic, photolytic and sono-photolytic, respectively within 90 min. Insertion of CdS, enhanced the sono-photolytic activity of MIL-125-NH2 by 3.1 times. CdS@MIL-125-NH2 showed good recyclability and its efficiency in carbofuran degradation was diminished by 6.5% only after five repetitive using cycles.