Zn-doped hydroxyapatite@g-C<sub>3</sub>N<sub>4</sub>: a novel efficient visible-light-driven photocatalyst for degradation of pharmaceutical pollutants

Kalita, Juri; Bharali, Linkon; Dhar, Siddhartha Sankar

doi:10.1039/d2nj04087e

Cited by 9 publications

(8 citation statements)

References 60 publications

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“…The characteristic peaks of the PO 4 3− group of HAp can be seen in the FTIR study of UiO‐66@HAp at 475, 565, 600, 962, 1031, and 1089 cm −1 . The symmetric and asymmetric stretching modes of P‐O are responsible for the strong bands at 1089, 1031, and 962 cm −1 43 . Peaks at 565 and 600 cm −1 have been assigned as the O‐P‐O bending vibrational mode of PO 4 3− 44 .…”

Section: Resultsmentioning

confidence: 98%

Metal–organic framework‐supported hydroxyapatite (UiO‐66@HAp): an efficient catalyst for the microwave‐assisted transesterification of palm oil

Kalita,

Bharali,

Chetia

et al. 2024

Biofuels Bioprod Bioref

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Biodiesel has recently emerged as a renewable and environmentally benign fuel substitute for fossil‐derived energy sources. The use of heterogeneous solid catalysts for the generation of biodiesel from biomass‐derived fats and oils is sustainable. Among various reported catalyst supports, metal–organic frameworks (MOFs) have been popular choices for enhancing catalytic activity for biodiesel synthesis because of several outstanding features including porosity, high surface area, adjustable structures, and uniform pore sizes. In this research, the authors synthesized a novel nanocomposite of MOF‐supported hydroxyapatite (UiO‐66@HAp) using a facile impregnation technique and the characterization of the as‐synthesized catalyst was performed by different spectroscopic methods including powder X‐ray diffraction (PXRD), Fourier transform infrared (FTIR), X‐ray photoelectron spectroscopy (XPS), field emission gun‐scanning electron microscope (FEG‐SEM), energy dispersive X‐ray spectroscopy (EDS), high resolution transmission electron microscopy (HR‐TEM), thermogravimetric analysis (TGA), and N2 adsorption–desorption techniques. After successful synthesis, the catalytic property of the prepared material was evaluated in the palm oil transesterification into biodiesel. Product formation was confirmed by the 1H nuclear magnetic resonance (NMR) spectroscopy, 13C NMR, FTIR, and gas chromatography–mass spectrometry (GC–MS) of the biodiesel. The influence of different reaction variables such as catalyst dosage, methanol/oil molar ratio, temperature of the reaction, and reaction time was also studied. The outcomes revealed that the maximum biodiesel yield (∼97%) was obtained when 6 wt% catalyst was used with a 6:1 ratio of methanol/oil at 70 °C for 1 h. It was also observed that, even after 5 cycles of reuse, the catalyst was capable of producing significant amounts of biodiesel (over 90%). The results suggest that the synthesized novel catalyst holds a promising future in the sustainable production of biodiesel.

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Section: Resultsmentioning

confidence: 98%

Metal–organic framework‐supported hydroxyapatite (UiO‐66@HAp): an efficient catalyst for the microwave‐assisted transesterification of palm oil

Kalita,

Bharali,

Chetia

et al. 2024

Biofuels Bioprod Bioref

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“…Co‐HAp was prepared using hydrothermal method as the procedure reported by our previous work [30] . In this, Co(NO 3 ) 2 .6H 2 O (1 mmol) and Ca(NO 3 ) 2 .4H 2 O (4 mmol) were dissolved in 50 mL of DI water under continuous agitation for 10–15 min to achieve a homogeneous mixture.…”

Section: Methodsmentioning

confidence: 99%

“…Co-HAp was prepared using hydrothermal method as the procedure reported by our previous work. [30] In this, Co(NO 3 ) 2 .6H 2 O (1 mmol) and Ca(NO 3 ) 2 .4H 2 O (4 mmol) were dissolved in 50 mL of DI water under continuous agitation for 10-15 min to achieve a homogeneous mixture. Afterward, 50 mL of 3 mmol aqueous (NH 4 ) 2 HPO 4 solution was added dropwise into the above suspension keeping a constant ratio of Ca + Co/P as 1.67.…”

Section: Preparation Of Cobalt Doped Hap (Co-hap)mentioning

confidence: 99%

CuWO₄ Reinforced Co‐doped HAp Nanocomposite: Improved Photocatalytic Activity Towards Degradation of Eosin Y and Catalytic Activity in Crossed Aldol Condensation Reaction

Kalita,

Bose,

Chakraborty

et al. 2024

ChemistrySelect

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Preventing the recombination of photoinduced charge carriers in different semiconductor photocatalysts is crucial but high‐performance photocatalyst is still challenging. Herein, we report the synthesis of a novel heterojunction of cobalt‐doped hydroxyapatite with CuWO4 i. e. Co‐HAp@CuWO4 nanocomposite by simple and facile ultrasonication technique. The morphological and structural features of the composite was examined using PXRD, FTIR, SEM, EDS, TEM, UV‐DRS and XPS techniques. The optical analysis showed that the band gap of Co‐HAp@CuWO4 nanocomposite is 1.59 eV which is very much lower than pure HAp. The photocatalytic efficiency of Co‐HAp@CuWO4 was assessed in the degradation of Eosin Y dye under solar light irradiation. The result of degradation capacity is 94.5 % after 70 minutes of solar irradiation and it follows pseudo first‐order kinetics. The impact of different reaction parameters such as catalyst amount, initial concentration of the dye, and solution pH was also examined. The recyclability test showed that the synthesized material was highly stable in the visible‐light driven dye degradation. Heterogeneous catalytic efficacy of the prepared nanocomposite was examined in the crossed aldol condensation reaction of benzaldehyde and acetone and the outcomes confirmed that dibenzylideneacetone (DBA) was formed in the condensation reaction in outstanding yields under optimum conditions.

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“…In the above equations, C 0 denotes the initial dye concentration, C is the concentration at a regular time interval during the degradation process, and k is the rate constant. 50 Both C 0 and C were taken in mg/L. Two separate curves were obtained by plotting of ln (C 0 /C) versus time (min) for the dyes.…”

Section: Kinetic Studiesmentioning

confidence: 99%

Hydroxyapatite nanoparticles decorated with metal–organic framework, Co‐Cu/ZIF@HAp, and evaluation of photocatalytic performance of the prepared nanocomposite in the degradation of organic pollutants

Bharali,

Kalita,

Chakraborty

et al. 2023

Applied Organom Chemis

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In this study, a novel hydroxyapatite (HAp)‐based composite, Co‐Cu/ZIF@HAp, was constructed through in situ growth and simultaneous sonication followed by magnetic string. Herein, the HAp‐based nanocomposite was obtained in which HAp was coated with cobalt–copper bimetallic zeolitic imidazolate framework (ZIF) in one‐pot synthesis method. The as‐synthesized composite was characterized by PXRD, FTIR, FE‐SEM, EDS, HR‐TEM, TGA‐DTG, XPS, BET, and UV‐DRS techniques, which suggested that HAp was well coated with bimetallic ZIF. The prepared composite was utilized as a catalyst in degradation of organic pollutants. Removal of organic pollutants such as organic dyes has become indispensable due to their higher stability, toxicity, and mutagenic nature. Two commonly found organic dyes, namely, Eosin Yellow (EY) and Brilliant Green (BG), were chosen for the investigation of photocatalytic activity of the as‐prepared catalyst. The degradation process was carried out under solar radiation, and there was no utilization of any oxidizing and reducing agent. Several parameters such as amount of catalyst dose, initial concentration of the dye solution, and effect of different pH conditions were evaluated for better understanding of photocatalytic performance of Co‐Cu/ZIF@HAp composite. Both EY and BG dyes were almost degraded up to 98.3% and 99.5%, respectively, within 50 min by the as‐prepared nanocomposite. Also, quenching test was performed that confirmed the formation of superoxide radicals (O2−.) as reactive oxygen species (ROS) in the photodegradation process. The as‐synthesized catalyst was repeatedly used for five times to ascertain the stability and reusability of catalyst.

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Zn-doped hydroxyapatite@g-C₃N₄: a novel efficient visible-light-driven photocatalyst for degradation of pharmaceutical pollutants

Abstract: Heterojunction formation has been shown to be an effective technique for tuning nanomaterial features such as chemical reactivity and optical performance.

Cited by 9 publications

References 60 publications

Metal–organic framework‐supported hydroxyapatite (UiO‐66@HAp): an efficient catalyst for the microwave‐assisted transesterification of palm oil

Metal–organic framework‐supported hydroxyapatite (UiO‐66@HAp): an efficient catalyst for the microwave‐assisted transesterification of palm oil

CuWO₄ Reinforced Co‐doped HAp Nanocomposite: Improved Photocatalytic Activity Towards Degradation of Eosin Y and Catalytic Activity in Crossed Aldol Condensation Reaction

Hydroxyapatite nanoparticles decorated with metal–organic framework, Co‐Cu/ZIF@HAp, and evaluation of photocatalytic performance of the prepared nanocomposite in the degradation of organic pollutants

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Zn-doped hydroxyapatite@g-C3N4: a novel efficient visible-light-driven photocatalyst for degradation of pharmaceutical pollutants

Abstract: Heterojunction formation has been shown to be an effective technique for tuning nanomaterial features such as chemical reactivity and optical performance.

Cited by 9 publications

References 60 publications

Metal–organic framework‐supported hydroxyapatite (UiO‐66@HAp): an efficient catalyst for the microwave‐assisted transesterification of palm oil

Metal–organic framework‐supported hydroxyapatite (UiO‐66@HAp): an efficient catalyst for the microwave‐assisted transesterification of palm oil

CuWO4 Reinforced Co‐doped HAp Nanocomposite: Improved Photocatalytic Activity Towards Degradation of Eosin Y and Catalytic Activity in Crossed Aldol Condensation Reaction

Hydroxyapatite nanoparticles decorated with metal–organic framework, Co‐Cu/ZIF@HAp, and evaluation of photocatalytic performance of the prepared nanocomposite in the degradation of organic pollutants

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Zn-doped hydroxyapatite@g-C₃N₄: a novel efficient visible-light-driven photocatalyst for degradation of pharmaceutical pollutants

CuWO₄ Reinforced Co‐doped HAp Nanocomposite: Improved Photocatalytic Activity Towards Degradation of Eosin Y and Catalytic Activity in Crossed Aldol Condensation Reaction