Hydrothermal assisted magnetic nano-hydroxyapatite encapsulated alginate beads for efficient Cr(VI) uptake from water

Periyasamy, Soodamani; Gopalakannan, Venkatrajan; Viswanathan, Natrayasamy

doi:10.1016/j.jece.2018.01.007

Cited by 65 publications

(19 citation statements)

References 58 publications

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“…The results showed that not only the surface adhesion or surface chemistry is effective on the adsorption rate but also closely related to the pore structure of the hydroxyapatite at the micro or macro level. The results also showed that in the adsorption process, firstly, Zn (II) ions were rapidly transported to the surface of the adsorbents and then diffused into the particles [39].…”

Section: Adsorption Kineticsmentioning

confidence: 89%

“…They pointed out that adsorption success of adsorbents increases by increasing of their surface area and related active sites. Periyasamy et al [39] used hydroxyapatite alginate beads (1-4 g/L) to remove Cr(VI) (100-200 mg/L) from water, and they determined optimum adsorbent concentration as 4 g/L for these experimental conditions.…”

Section: The Change Of Zn(ii) Adsorption By Hap With Hap Concentrationmentioning

confidence: 99%

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A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

Dizle

Uysal

2021

Aksaray University Journal of Science and Engineering

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In this study, hydroxyapatite particles (HAp) were chemically synthesized by using coprecipitation method to determine their capabilities on the sorption of Zn(II) ions from aqueous solutions. HAp particles were chosen because of their low cost for production, high stability, easy to use, and effective sorption power. In order to determine the operation conditions of the adsorption system to be installed when this adsorbent is desired to be used in field applications, parameters such as system pH, initial Zn(II) concentration and adsorbent concentrations have been optimized. Properties and functional structure of the adsorbent materials were characterized by using SEM, FTIR, and EDX analyzes. The kinetic behavior of Zn(II) adsorption with HAp was consistent with the pseudo second order kinetic model. Additionally, the equilibrium states of the adsorption processes were studied by using Langmuir, Freundlich, Temkin, Scatchard and Dubinin-Radushkevich (D-R) isotherm models. The maximum sorption capacity HAp was obtained as 500 mg/g, and best removal value of 91% were determined at pH of 6.0, optimum adsorbent concentration of 3.75 g/L, in 25 mg/L Zn(II) concentration and optimum mixing time of 45 min. This study showed that the HAp can be considered an effective adsorbent on the Zn(II) removal from wastewater.

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Section: Adsorption Kineticsmentioning

confidence: 89%

Section: The Change Of Zn(ii) Adsorption By Hap With Hap Concentrationmentioning

confidence: 99%

A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

Dizle

Uysal

2021

Aksaray University Journal of Science and Engineering

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“…The obtained MCOP−Alg composite beads were engrossed in calcium chloride solution for 48 h to attain the complete cross-linking with Ca 2+ ions. Then, the obtained MCOP−Alg composite beads were separated, washed with ethanol, and dried in a hot air-oven at 80 °C for 12 h. The resulting MCOP−Alg composite beads were transferred into an autoclave, and 100 mL of DD water was added to it and then heated to 120 °C upto 24 h. 33 After that, the hydrothermally treated MCOP− Alg composite beads were washed with DD water and dried at 70 °C for 12 h using a hot air-oven. Finally, the dried MCOP− Alg composite beads were used for the iron adsorption studies.…”

Section: Methodsmentioning

confidence: 99%

Hydrothermal Synthesis of Melamine-Functionalized Covalent Organic Polymer-Blended Alginate Beads for Iron Removal from Water

Periyasamy

Viswanathan

2019

J. Chem. Eng. Data

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The present study aimed to utilize the advantages of the porous covalent organic frameworks (COFs) by synthesizing in a usable bead form with alginate using hydrothermal method. The melamine-rich covalent organic polymer/alginate (MCOP−Alg) composite beads were utilized for iron removal. The maximum adsorption capacity of MCOP−Alg composite beads was achieved as 53.89 mg g −1 . The synthesized MCOP−Alg composite beads were characterized using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis with mapping analysis, Fourier transform infrared, and Brunauer−Emmett−Teller studies. The various adsorption experiments such as contact time, solution pH, competing ions, and temperature have been optimized successfully for iron removal. The equilibrium result was demonstrated with Freundlich, Langmuir, and Dubinin−Radushkevich (D−R) isotherms. The thermodynamic result indicates the endothermic and spontaneous nature. The iron adsorption mechanism follows surface complexation with electrostatic attraction and ion-exchange. Fe(II)-adsorbed MCOP−Alg composite beads could be easily regenerated using 0.5 M HCl. The field study of MCOP−Alg composite beads was also examined.

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“…They also reported out that main adsorption mechanism of OTC onto HAp is surface complexation. Periyasamy et al [43] used hydroxyapatite alginate beads as adsorbents for Cr(VI) removal at pH range of 3.0-11.0, adsorbent dosages of 0.05-0.2 g/50 mL, Cr(VI) concentration of 100-200 mg/L, and reaction time of 10-100 min. They determined optimum adsorbent dose of 0.2 g/50 mL for adsorption process.…”

Section: The Change Of Zn(ii) Adsorption By Mhap With Mhap Concentrationmentioning

confidence: 99%

Removal of Zn (II) from water by magnetic hydroxyapatite nanocomposite

Uysal¹,

Canbakiş²

2021

Pamukkale J Eng Sci

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In this study, the capability of chemically synthesized hydroxyapatitemagnetite nanocomposite for the sorption of Zn(II) ions was investigated. Magnetite-hydroxyapatite nanocomposite (MHAp) has been chosen as an adsorbent because of its excellent properties such as stability, low cost and effective sorption power. Adsorption process were tried to find the optimum conditions of the parameters for Zn(II) removal such as pH, concentrations of initial Zn(II) and adsorbent and reaction time. Nanocomposite properties were also characterized by using Fouirer Transform Infrared Spektrofotometre (FTIR), Scanning Electron Microscope (SEM) and Energy-dispersive X-ray Spectroscopy (EDX) techniques. Our results showed that the adsorption kinetic of Zn(II) using HAp/Fe3O4 composite fitted to the pseudo-second-order kinetic model. Calculations were carried out to determine which isotherm model the adsorption fits by using Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich (D-R) equations. Adsorption potential of MHAp nanocomposite was obtained 555.55 mg/g, and best removal value of 96% were determined at pH of 6.0, optimum adsorbent concentration of 6.25 g/L, in 25 mg/L Zn(II) concentration and optimum mixing time of 30 min. This study showed that the MHAp can be considered an effective adsorbent on the Zn(II) removal from wastewater. Bu çalışmada, kimyasal olarak sentezlenen hidroksiapatit ve nano manyetit partiküllerinden manyetit-hidroksiapatit (HAp/Fe3O4-MHAp) nanokompozit malzemesi üretilmiş ve sulardan Zn(II) iyonlarının gideriminde adsorbent olarak kullanılmıştır. MHAp nanokompozit materyali düşük maliyet, kullanım ve üretim kolaylığı, yüksek stabilite ve etkili sorpsiyon kapasitesi gibi özelliklere sahip olduğu için seçilmiştir. Kesikli adsorpsiyon prosesine etki eden parametreler örneğin pH, başlangıç Zn(II) konsantrasyonu, adsorbent konsantrasyonu ve reaksiyon süresi için optimum değerlerin belirlenmesine yönelik deneyler gerçekleştirilmiştir. Elde edilen kompozit malzemenin özelliklerini belirlemek amacıyla Fourier Dönüşümlü Kızılötesi Spektroskopisi (FTIR), Taramalı Elektron Mikroskopu (SEM), Enerji yayılımlı X-Işını Analizi (EDX) kullanılmıştır. Adsorpsiyonun izoterm tipini belirlemek için Langmuir, Freundlich, Tempkin ve Dubinin-Radushkevich (D-R) izoterm modelleri denenmiş ve reaksiyonun zamanla değişimini tespit etmek amacıyla kinetic çalışmaları yürütülmüştür. Elde edilen sonuçlar, HAp/Fe3O4 kompozitinin sulardan Zn(II) iyonlarının gideriminde başarılı bir adsorbent olduğunu ve reaksiyon kinetiğinin Yalancı İkinci Dereceden Kinetik Modele uyduğunu göstermiştir. Optimum deneysel koşullarda (pH:6.0, 25 mg Zn(II)/L, 30 dk, 6.25 g/L MHAp) maksimum sorpsiyon kapasitesi 555.55 mg/g ve giderim verimi %96 olarak tespit edilmiştir.

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Hydrothermal assisted magnetic nano-hydroxyapatite encapsulated alginate beads for efficient Cr(VI) uptake from water

Cited by 65 publications

References 58 publications

A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

A Study On the Zn(II) Separation Efficiency of Chemically Synthesized Hydroxyapatite (HAp) Particles

Hydrothermal Synthesis of Melamine-Functionalized Covalent Organic Polymer-Blended Alginate Beads for Iron Removal from Water

Removal of Zn (II) from water by magnetic hydroxyapatite nanocomposite

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