Green synthesized hydroxyapatite for efficient immobilization of cadmium in weakly alkaline environment

Yan, Yubo; Du, Mingliang; Jing, Liquan; Zhang, Xiaoxin; Li, Qiao

doi:10.1016/j.envres.2023.115445

Cited by 6 publications

(3 citation statements)

References 85 publications

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“…A simultaneous thermodynamic study also showed that the adsorption mechanism was spontaneous and endothermic. Yan et al 46 also studied the adsorption kinetics together with thermodynamic analysis of straw-derived dissolved organic matter-derived substrate with distiller effluent derived with Ca and (NH 4 ) 2 HPO 4 , and they also reported that the thermodynamic data showed a spontaneous and endothermic adsorption process for Cd(II) with an adsorption capacity of 222 mg g −1 .…”

Section: Heavy Metal Removal Studiesmentioning

confidence: 99%

Recent Advances in Wastewater Treatment by Utilisation of Bio-waste-derived Hydroxyapatite

Avşar

2024

Kem. ind. (Online)

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Hydroxyapatite (HAp) is basically calcium phosphate and the main inorganic component in natural bone and teeth structure. Animal bones and eggshells are mass-generated bio-wastes, and their calcium-rich structure makes them suitable precursors for bioactive HAp synthesis through biomimetic mineralisation. Industrial wastewater discharge is a worldwide alarming problem due to high-capacity industrial-scale processes, and their adverse effects on human health and environment will be encountered long term. Adsorption is the most widely used separation process in wastewater treatment, in which HAp particles can be used as bio-adsorbents for wastewater treatment processes due to their bioactive nature. Utilisation of bio-waste-derived HAp particles for wastewater treatment applications would be a step towards sustainable development and circular economy concepts. It promotes the reuse and recycle rate of bio-wastes as bio-adsorbents through an effective waste management strategy and increases the circularity of the material in the production chain. This study offers a brief overview of articles published in 2023 on the use of bio-waste-derived HAp particles for wastewater treatment.

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Section: Heavy Metal Removal Studiesmentioning

confidence: 99%

Recent Advances in Wastewater Treatment by Utilisation of Bio-waste-derived Hydroxyapatite

Avşar

2024

Kem. ind. (Online)

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“…Over the past years, due to its strong adsorption affinity to diverse water pollutants, low water solubility, thermal stability, and ionic exchange capacity, hydroxyapatite has attracted enormous attention for its effectiveness in the removal of heavy metal ions [26,27]. HAP was actively used in several research studies for the removal of various pollutants.…”

Section: Introductionmentioning

confidence: 99%

Removal of Indium Ions from Aqueous Solutions Using Hydroxyapatite and Its Two Modifications

et al. 2023

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Hydroxyapatite (HAP) coupled with its two modifications HAP P123 and HAP F127 were applied for indium removal from aqueous solutions. Adsorbents’ abilities to remove indium ions were assessed in relation to pH, time of contact, indium concentration, temperature, and presence of co-existing ions. Adsorption was discovered to be pH-dependent for all sorbents, with maximum indium ion removal at pH 4.0. Both the Langmuir and the Freundlich isotherm models were used to explain the experimental results. For all adsorbents, the Freundlich isotherm provided a better description of the equilibrium of the sorption. The sorption capacity computed from the Langmuir model changed from 10,799 mg/g for HAP F127 to 11071 mg/g for HAP. A number of models were used to describe the adsorption’s kinetics. The adsorption of indium on HAP was better described by the pseudo-second-order model, on HAP P123 by the pseudo-first-order model, and on HAP F127 by the Elovich model. Thermodynamic parameters showed that indium ions’ adsorption onto HAP adsorbents was a feasible, spontaneous, and exothermic process. The effectiveness of indium removal by the examined adsorbents was unaffected by the presence of other metal ions in the solutions. ORCA quantum chemistry software was used to theoretically examine the interactions between the surfaces of adsorbents and the indium ions. High desorption efficiency showed that the applied adsorbents can be used for manifold wastewater treatment.

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“…Over the past decades, apatite minerals like hydroxyapatite (HAp, Ca 10 (PO 4 ) 6 (OH) 2 , has attracted huge interest in effectively adsorbing heavy metals ion 18 , 19 . Some previous studies investigated HAp for the removal of a variety of contaminants.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Cd (II) removal from aqueous solution by natural hydroxyapatite/bentonite composite using response surface methodology

Desalegn

Bekele

Femi

2023

Sci Rep

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Toxic cadmium (Cd) was removed from water using eggshell-based hydroxyapatite (HAp) grafted bentonite (HAp/bentonite) composite through a straightforward chemical synthesis route. The as-prepared adsorbents were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller analysis (BET). Optimization of the initial adsorbate concentration, adsorbent dosage, pH, and contact time—all of which affect the adsorption process—was performed using the central composite design (CCD) of the response surface methodology (RSM). 99.3 percent adsorptive removal efficiency was observed at an initial concentration of 61.58 mg/L of Cd (II), with an adsorbent dosage of 1.58 g, a solution pH of 5.88, and a contact time of 49.63 min. The analysis of variance (ANOVA) was performed, and the multiple correlation coefficient (R2) was found to be 0.9915 which confirms the significance of the predicted model. The Langmuir isotherm model best represented the adsorption isotherm data, which also predicted a maximum sorption capacity of 125.47 mg/g. The kinetic data were best described by the pseudo-second order model.

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Green synthesized hydroxyapatite for efficient immobilization of cadmium in weakly alkaline environment

Cited by 6 publications

References 85 publications

Recent Advances in Wastewater Treatment by Utilisation of Bio-waste-derived Hydroxyapatite

Recent Advances in Wastewater Treatment by Utilisation of Bio-waste-derived Hydroxyapatite

Removal of Indium Ions from Aqueous Solutions Using Hydroxyapatite and Its Two Modifications

Optimization of Cd (II) removal from aqueous solution by natural hydroxyapatite/bentonite composite using response surface methodology

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