Photocatalytic Degradation of Valsartan by MoS2/BiOCl Heterojunctions

Abstract

In the present study, the removal of valsartan (VLS), an antihypertensive agent, under simulated solar radiation with the use of molybdenum sulfide-bismuth oxychloride composites (MoS2/BiOCl), of variable MoS2 content (0.1–10.0 wt.%) was investigated. The physicochemical properties of the photocatalysts were examined by XRD, DRS, BET and TEM/HRTEM. Preliminary tests were conducted to examine the photocatalytic efficiency of the synthesized MoS2/BiOCl composites towards VLS degradation in ultrapure water (UPW). It was found that the activity of pure BiOCl is improved with the addition of MoS2. The degradation rate was maximized with the use of the catalyst containing 0.25 wt.% MoS2. It was also found that the increase in catalyst concentration (50–1000 mg/L) enhances VLS degradation. It was found that VLS removal decreased by increasing VLS concentration. The effect of the water matrix on VLS removal was studied by carrying out experiments in real and synthetic water matrices. VLS degradation in UPW was faster than in bottled water (BW) and wastewater (WW), mainly due to the existence of organic matter in real aqueous media. Lastly, 0.25 wt.% MoS2/BiOCl showed great stability after 360 min of irradiation, serving as a promising catalyst for water remediation of emerging contaminants under solar irradiation.

Photocatalytic Degradation of Losartan with Bismuth Oxychloride: Batch and Pilot Scale Demonstration

“…In 2021, our group investigated sulfamethoxazole removal using BiOCl under simulated solar irradiation, emphasizing the water matrix effect on the overall efficiency [23]. In addition, valsartan removal was studied using MoS 2 /BiOCl MoS 2 (0.1-10.0 wt.%) composite photocatalysts [24]. The results showed that 0.25 wt.% MoS 2 /BiOCl was the best-performing photocatalytic material.…”

Preparing a dual-function BiVO4/NiFe-LDH composite photoanode for enhanced photoelectrocatalytic wastewater treatment and simultaneous hydrogen evolution

“…Therefore, the PC technology presents a promising application potential for wastewater treatment. [8][9][10][11][12][13][14][15][16][17] Recently, many high-performance photocatalysts have been designed and synthesized with good applications in PC degradation and removal of antibiotic wastewater. [18][19][20] However, most photocatalysts have some common defects, such as a high recombination rate of e À -h + pairs, low separation and migration efficiency of photogenerated carriers, and they are difficult to separate and recover from wastewater.…”

One-pot room-temperature synthesis of a BiOCl hierarchical microsphere assembled from nanosheets with exposed {001} facets for enhanced photosensitized degradation

“…Constructing heterojunction, doping with metal or non-metal, regulating bandgap, introducing surface defect, regulating crystal surface exposure, have been adopted to develop BiOCl photocatalysts capable of collecting visible light. 9,13,14 At present, the research on BiOCl nanosheets with exposed {001} facets has indicated that the reactive {001} facets contribute to outstanding photocatalytic activity. 15,16 Recently, it is generally considered that the exposed {001} facets can result in the formation of oxygen vacancies.…”