Zinc oxide-hydroxyapatite nanocomposite photocatalysts for the degradation of ciprofloxacin and ofloxacin antibiotics

Bekkali, C. El; Bouyarmane, H.; Karbane, Miloud El; Masse, Sylvie; Saoiabi, A.; Coradin, Thibaud; Laghzizil, A.

doi:10.1016/j.colsurfa.2017.12.051

Cited by 78 publications

(18 citation statements)

References 43 publications

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“…Another semiconducting photocatalyst has been developed and is being applied to the treatment of emerging pollutants, such as zinc oxide-hydroxyapatite (HAp). El Bekkali et al [137] explored the use of ZnO-HAp for antibiotic removal from contaminated water under UV irradiations.…”

Section: Advanced Oxidation Processes (Aops)mentioning

confidence: 99%

Emerging Pollutants in Moroccan Wastewater: Occurrence, Impact, and Removal Technologies

Jari

Roche

Necibi

et al. 2022

Journal of Chemistry

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The rapid growth of anthropogenic activities in recent decades has resulted in the appearance of numerous new chemical compounds in the environment, known as “emerging pollutants” (EPs) or “contaminants of emerging concern” (CECs). Although partially or not yet regulated or monitored, there is growing research interest in these EPs among the scientific community because of their bioaccumulation, persistence, and adverse effects. Among these, endocrine disruptors, pesticides, and pharmaceuticals can have harmful impacts on human health and the ecosystem. Conventional wastewater treatment technologies are not effective in removing these contaminants, allowing them to be released into the receiving environment. In order to improve the understanding of emerging pollutants, this review discusses the source, occurrence, and impacts of bisphenol A, atrazine, amoxicillin, and paracetamol as model molecules of emerging environmental pollutants, an issue that remains underrepresented in Morocco. Then, treatment methods for EPs are reviewed, including adsorption, advanced oxidation processes, biodegradation, and hybrid treatment. It is proposed that adsorption and photocatalysis can be used as simple, effective, and environmentally friendly technologies for their removal. Thus, we summarize some of the adsorbent and photocatalyst materials applied in recent work to control these pollutants. Towards the end of this paper, the development of inexpensive and locally available (Morocco) materials to remove these compounds from wastewater is considered.

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Section: Advanced Oxidation Processes (Aops)mentioning

confidence: 99%

Emerging Pollutants in Moroccan Wastewater: Occurrence, Impact, and Removal Technologies

Jari

Roche

Necibi

et al. 2022

Journal of Chemistry

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“…However, TiO 2 and ZnO nanoparticles (NPs) are most widely used photocatalysts owing to excellent photocatalytic performance, high chemical stability, and non-toxic nature. − They are both wide band gap materials, which necessitate the use of UV light for photoexcitation. This restricts the use of economically favorable solar light-induced photocatalytic degradation, as only 6% of the solar light corresponds to the UV region. , Thus, there is a demand for developing photocatalysts, which can utilize the entire solar spectral energy, either by modifying the band structure of the existing semiconductor-type photocatalysts , or by developing the new ones . In this regard, heterostructures made of ZnO and carbon dots (CDs) of sizes less than 10 nm could be very effective photocatalysts owing to their compatible energy levels of valence bands and conduction bands of ZnO with that of the work function of CDs. , Such heterostructure is essential to suppress electron–hole recombination and enhance photocatalytic degradation.…”

Section: Introductionmentioning

confidence: 99%

“…This restricts the use of economically favorable solar light-induced photocatalytic degradation, as only 6% of the solar light corresponds to the UV region. 15,16 Thus, there is a demand for developing photocatalysts, which can utilize the entire solar spectral energy, either by modifying the band structure of the existing semiconductor-type photocatalysts 17,18 or by developing the new ones. 19 In this regard, heterostructures made of ZnO and carbon dots (CDs) of sizes less than 10 nm could be very effective photocatalysts owing to their compatible energy levels of valence bands and conduction bands of ZnO with that of the work function of CDs.…”

Section: Introductionmentioning

confidence: 99%

Sunlight-Driven Photocatalytic Degradation of Ciprofloxacin by Carbon Dots Embedded in ZnO Nanostructures

Mukherjee

Cilamkoti

Dutta

2021

ACS Appl. Nano Mater.

111

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Surface modification of ZnO nanoparticles (NPs) is considered as a key for enhanced sustained generation of reactive oxygen species (ROS) in the reaction medium for improving the photocatalytic degradation phenomenon. Here, we present a simple chemical method of synthesizing carbon dots (CDs) embedded on the surface of ZnO NPs denoted as ZnO/CD nanocomposites (NCs) as a photocatalyst for efficient sunlight-driven degradation of ciprofloxacin (CIP). The X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies confirmed the formation of needle-shaped clusters of ZnO/CD NCs. The band gaps of ZnO/CD NCs and pristine ZnO are determined from Tauc's plot. Under optimized conditions, the batch of CIP at pH 6.3 ± 0.1 treated with 0.6 g L −1 of ZnO/CD NCs revealed 98% photocatalytic degradation of CIP in 110 min by harnessing longer UV and the visible components of sunlight. The rate of photocatalytic degradation was 0.30 min −1 , which was 3 times higher than that of the pristine ZnO NPs. The enhanced rate of degradation by ZnO/CD NCs is attributed to the improved mobility of charge carriers and the generation of enhanced ROS. This is confirmed by the scavenging studies of hydroxyl radicals and superoxide radicals. The higher ROS generation is attributed to the inhibition of charge carrier recombination facilitated by the CDs embedded on the surface of ZnO NPs. The applicability of ZnO/CD NCs as a photocatalyst is demonstrated from five cycles of repeatability studies. After five cycles of operation, the structure and surface morphology of the used ZnO/CD NCs were stable, confirmed by XRD, TEM, and Fourier transform infrared studies. It is concluded that ZnO/CD NCs are efficient sunlight-driven photocatalysts for improved photocatalytic degradation of CIP, a model emerging contaminant.

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“…Nevertheless, other oxides (ZnO, -Fe 2 O 3 , etc.) prepared under suitable synthesis conditions lead to satisfactory photocatalysis results but require a modification of their surface by using a porous systems such as silica or clays which accelerate the adsorption rate and consequently their photodegradation [9,10]. For good adsorption, an affinity between the solid and the pollutant is first required such as performed is the case of grafted silica or modified titanium oxides [11].…”

Section: Introductionmentioning

confidence: 99%

“…For good adsorption, an affinity between the solid and the pollutant is first required such as performed is the case of grafted silica or modified titanium oxides [11]. For this purpose, the combination of metal oxide and hydroxyapatite may constitute a photoactive support for the degradation of organic residues in water [8,10]. Of these, the continuous release of drugs and their metabolites into the aquatic environment gives these molecules a character of pseudo-persistence.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the photocatalytic efficiency of metal oxide/hydroxyapatite nanocomposites in the degradation kinetic of ciprofloxacin in water

et al. 2020

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The photocatalytic efficiency of the metal oxide-hydroxyapatite photocatalysts prepared by soft chemistry using phosphate rock as calcium and phosphorus precursors has been investigated on the degradation kinetic of ciprofloxacin residues in water under UV-light (HPK125 W Lamp). The nature of metal oxide (TiO2, ZnO, Fe2O3), structure, surface area and pore-size distributions of the catalysts were analyzed by various techniques analyses. Association of nanoscale metal oxide with hydroxyapatite could enhance the sorption properties of the materials and confers them interesting photodegradation properties. The results of the kinetic study revealed that the activities of these photocatalysts were dependent on the oxide surface and the best activity was obtained with TiO2/hydroxyapatite catalyst, which had the largest surface area. The effects of various operational parameters were thoroughly considered in order to achieve highest photodegradation efficiency. A correlation between the nature of associated metal oxide, surface properties, the sorption behavior and the photodegradation capacity of these composites could be establishedd.

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Zinc oxide-hydroxyapatite nanocomposite photocatalysts for the degradation of ciprofloxacin and ofloxacin antibiotics

Cited by 78 publications

References 43 publications

Emerging Pollutants in Moroccan Wastewater: Occurrence, Impact, and Removal Technologies

Emerging Pollutants in Moroccan Wastewater: Occurrence, Impact, and Removal Technologies

Sunlight-Driven Photocatalytic Degradation of Ciprofloxacin by Carbon Dots Embedded in ZnO Nanostructures

A comparative study of the photocatalytic efficiency of metal oxide/hydroxyapatite nanocomposites in the degradation kinetic of ciprofloxacin in water

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