Volume 19, Issue 6 e3124
RESEARCH ARTICLE

Efficient removal of emerging pollutant oxytetracycline by cost-effective biochar–hydroxyapatite composite

Quang Minh Tran

Quang Minh Tran

University of Science and Technology of Hanoi, A21 Building, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

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Phuong Thu Le

Corresponding Author

Phuong Thu Le

University of Science and Technology of Hanoi, A21 Building, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

Correspondence

Phuong Thu Le and Thi Mai Thanh Dinh, University of Science and Technology of Hanoi, A21 Building, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.

Emails: Email: [email protected] and

Email: [email protected]

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Thu Phuong Nguyen

Thu Phuong Nguyen

Institute for Tropical Technology, A13 Building, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

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Hong Nam Nguyen

Hong Nam Nguyen

University of Science and Technology of Hanoi, A21 Building, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

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Thi Hai Do

Thi Hai Do

Hanoi University of Mining and Geology, No.18 Vien Street, Duc Thang Ward, Bac Tu Liem District, Hanoi, Vietnam

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Trung Dung Nguyen

Trung Dung Nguyen

Le Quy Don Technical University, 236 Hoang Quoc Viet, Hanoi, Vietnam

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Thi Mai Thanh Dinh

Corresponding Author

Thi Mai Thanh Dinh

University of Science and Technology of Hanoi, A21 Building, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam

Correspondence

Phuong Thu Le and Thi Mai Thanh Dinh, University of Science and Technology of Hanoi, A21 Building, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.

Emails: Email: [email protected] and

Email: [email protected]

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First published: 29 July 2024
Citations: 1

Abstract

Biochar (BC) and hydroxyapatite (HAp) are widely used in environmental remediation due to their high adsorption capacity, porous structure, large specific surface area, chemical stability, non-toxicity, and low solubility. Combining BC and HAp is a green and effective strategy for creating new adsorbents (BCH) that have a synergistic impact on wastewater treatment. In this study, BCH composites derived from apatite ore and macadamia nut shells were synthesized by the wet impregnation method to remove oxytetracycline (OTC) from aqueous solutions. The BC-HAp composite with a ratio of 10:1 (by weight) was the most effective material for removing OTC. The Redlich–Peterson model achieved the highest correlation coefficient among the four models tested (Freundlich, Langmuir, Temkin, and Redlich–Peterson). The maximum adsorption capacity calculated with the Langmuir isotherm was 49.59 mg g−1. It was found that the adsorption process was significantly affected by the solution pH. The bipolar form of the drug was found to be OTC±, and the adsorption was most effective in solutions with a pH of 6. The OTC adsorption dominant mechanisms on nanocomposites could be electrostatic attraction, hydrogen bonding formation, surface complexation, or ion exchange. Therefore, the BCH composite showed great potential for removing OTC pollutants in a cost-effective, and environmentally friendly manner.

CONFLICT OF INTEREST STATEMENT

The authors declare no conflicts of interest.

DATA AVAILABILITY STATEMENT

Data will be made available on request.

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