Photocatalytic mineralization and degradation kinetics of ampicillin and oxytetracycline antibiotics using graphene sand composite and chitosan supported BiOCl

In this study, BiOCl samples were synthesized under different pH values and characterized by XRD, SEM, UV-vis DRS, BET, photoelectrochemical measurement and PL. The photocatalytic performances of the as-prepared samples were evaluated through the decomposition of trichloroethylene (TCE) under UV irradiation. The influences of several parameters such as solution pH and common inorganic anions on TCE removal were investigated. Results indicated that BiOCl-0.6 exhibited better photocatalytic performance than BiOCl-6.0 because of its higher migration ability of photo-induced carrier. The photocatalytic degradation of TCE over BiOCl-0.6 followed pseudo first-order kinetics and appeared to be more efficient in acidic solution than in alkaline. TCE was almost completely dechlorinated in 120 minutes. The inhibiting effect of naturally occurring anions was in the order of HCO 3 ->SO 4 2->NO 3 -, while Clexhibited a dual effect. Moreover, BiOCl-0.6 exhibited superior reusability after three cycles of repetition tests.

show abstract

“…The fact that Cl ‐ is the sink of hole has been well documented . Furthermore, Cl ‐ possesses higher affinity to hole than ·OH.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic degradation of trichloroethylene over BiOCl under UV irradiation

Liu

Yang

Zhen

et al. 2018

Applied Organom Chemis

View full text Add to dashboard Cite

show abstract

“…Their results indicate an OTC removal efficiency of 39% and 28%, in dark, and 85% and 70% after 120 min under solar light, at pH 6.0, for BiOCl/GSC and BiOCl/CT, respectively (Priya et al . ). Even considering the limitations of comparing experiments with different conditions of irradiation, it is interesting to notice that these times required for the photocatalytic removal of OTC are similar to those obtained by Leal et al .…”

Section: Photodegradation As Remediation Methodsmentioning

confidence: 97%

“…Priya et al . () performed irradiation experiments (under solar light, intensity: 35 × 10 3 ± 100 Lx) to degrade OTC (1 × 10 −4 m ) in aqueous phase and used nano‐sized BiOCl immobilized onto graphene sand composite (GSC) and chitosan (CT) as photocatalysts (50 mg/50 mL). Their results indicate an OTC removal efficiency of 39% and 28%, in dark, and 85% and 70% after 120 min under solar light, at pH 6.0, for BiOCl/GSC and BiOCl/CT, respectively (Priya et al .…”

Section: Photodegradation As Remediation Methodsmentioning

confidence: 99%

Oxytetracycline in intensive aquaculture: water quality during and after its administration, environmental fate, toxicity and bacterial resistance

Leal

Santos

Esteves

2018

Reviews in Aquaculture

View full text Add to dashboard Cite

Oxytetracycline (OTC) is one of the most used antibiotics in aquaculture. This raises concerns due to its effects in human and animal health, the environmental contamination and the consequences arising therefrom. This review focuses on the OTC application in intensive aquaculture. It compiles and complements the dispersed information, presenting a comprehensive study about the OTC effects, from its administration to farmed fish, until its release into the surrounding aquatic systems. Several topics about OTC are presented and discussed: physicalchemical properties, interaction with ions, application to farmed fish, effects in water quality and possible treatments, biological activity and toxicity of OTC byproducts, environmental fate. Based on the information gathered, one concludes that OTC establishes strong complexes with Ca 2+ and Mg 2+ , which may have implications on its biological activity. OTC acts as inhibitor of protein synthesis and is poorly metabolized or unmetabolized by fish. Its common recommended daily dose is about 75 mg kg À1 but depends on the administration conditions and on target fish species. Regarding OTC removal from water within a semiclosed aquaculture's water circuit, ozonation and photodegradation are not completely efficient methods as none of them promotes total mineralization. However, photodegradation can be applied as a complementary method prior to ozonation, allowing to reduce costs. OTC by-products do not appear to retain its biological activity, but toxicity studies mimicking environmental conditions were not found. In open circuits (cages), water column where OTC is administered not suffer a specific treatment and the antibiotic is easily spread by the surrounding environments, affecting their inhabitants. OTC is released in the aquatic system in freely dissolved form and/or associated with organic or inorganic compounds, being subjected to natural photolysis, hydrolysis and/or biodegradation.

show abstract

“…Among various dye wastewater treatment technologies, semiconductor-based photocatalysis has received a great interest and attracted worldwide attention [5–7]. This is because it utilizes solar energy for the decomposition of dye pollutants, whose source of energy is abundant, inexhaustible, non-polluting, and free [8, 9]. At present, TiO 2 is the most widely used semiconductor photocatalyst due to its high photoactivity, low cost, chemical and photochemical stability, non-toxicity, and environmentally friendly features.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Photocatalytic Property of Novel SrTiO3/Bi5O7I Nanocomposites

Xia

et al. 2018

Nanoscale Res Lett

View full text Add to dashboard Cite

The novel SrTiO3/Bi5O7I nanocomposites were successfully fabricated by a thermal decomposition approach. The as-prepared samples were characterized by XRD, XPS, SEM, EDS, FTIR, DRS and PL spectra. The results show that the SrTiO3/Bi5O7I nanocomposites are composed of perovskite SrTiO3 nanoparticles and tetragonal Bi5O7I nanorods. The SrTiO3/Bi5O7I nanocomposites exhibit an excellent photocatalytic performance for the degradation of RhB solution under simulated solar light irradiation, which is superior to that of pristine Bi5O7I and SrTiO3. In particular, the 30 wt% SrTiO3/Bi5O7I nanocomposite is found as the optimal composites, over which the dye degradation reaches 89.6% for 150 min of photocatalysis. The photocatalytic degradation rate of the 30 wt% SrTiO3/Bi5O7I nanocomposite is found to be 3.97 times and 12.5 times higher than that of bare Bi5O7I and SrTiO3, respectively. The reactive species trapping experiments suggest that and holes are the main active species responsible for the RhB degradation. In addition, the PL spectra elucidate the effective separation of photoinduced electron-hole pairs. Further, the possible photocatalytic mechanism of the SrTiO3/Bi5O7I nanocomposites is also elucidated based on the experimental evidences.

show abstract

Photocatalytic mineralization and degradation kinetics of ampicillin and oxytetracycline antibiotics using graphene sand composite and chitosan supported BiOCl

Cited by 126 publications

References 59 publications

Photocatalytic degradation of trichloroethylene over BiOCl under UV irradiation

Photocatalytic degradation of trichloroethylene over BiOCl under UV irradiation

Oxytetracycline in intensive aquaculture: water quality during and after its administration, environmental fate, toxicity and bacterial resistance

Fabrication and Photocatalytic Property of Novel SrTiO3/Bi5O7I Nanocomposites

Contact Info

Product

Resources

About