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Effects of NaOH Activation on Adsorptive Removal of Herbicides by Biochars Prepared from Ground Coffee Residues

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  • Yong-Gu Lee

    (Department of Environmental Engineering, College of Engineering, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea)

  • Jaegwan Shin

    (Department of Integrated Energy and Infra system, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea)

  • Jinwoo Kwak

    (Department of Integrated Energy and Infra system, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea)

  • Sangwon Kim

    (Department of Integrated Energy and Infra system, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea)

  • Changgil Son

    (Department of Integrated Energy and Infra system, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea)

  • Kyung Hwa Cho

    (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Korea)

  • Kangmin Chon

    (Department of Environmental Engineering, College of Engineering, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea
    Department of Integrated Energy and Infra system, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Korea)

Abstract

In this study, the adsorption of herbicides using ground coffee residue biochars without (GCRB) and with NaOH activation (GCRB-N) was compared to provide deeper insights into their adsorption behaviors and mechanisms. The physicochemical characteristics of GCRB and GCRB-N were analyzed using Brunauer–Emmett–Teller surface area, Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction and the effects of pH, temperature, ionic strength, and humic acids on the adsorption of herbicides were identified. Moreover, the adsorption kinetics and isotherms were studied. The specific surface area and total pore volume of GCRB-N (405.33 m 2 /g and 0.293 cm 3 /g) were greater than those of GCRB (3.83 m 2 /g and 0.014 cm 3 /g). The GCBR-N could more effectively remove the herbicides (Q e,exp of Alachlor = 122.71 μmol/g, Q e,exp of Diuron = 166.42 μmol/g, and Q e,exp of Simazine = 99.16 μmol/g) than GCRB (Q e,exp of Alachlor = 11.74 μmol/g, Q e,exp of Diuron = 9.95 μmol/g, and Q e,exp of Simazine = 6.53 μmol/g). These results suggested that chemical activation with NaOH might be a promising option to make the GCRB more practical and effective for removing herbicides in the aqueous solutions.

Suggested Citation

  • Yong-Gu Lee & Jaegwan Shin & Jinwoo Kwak & Sangwon Kim & Changgil Son & Kyung Hwa Cho & Kangmin Chon, 2021. "Effects of NaOH Activation on Adsorptive Removal of Herbicides by Biochars Prepared from Ground Coffee Residues," Energies, MDPI, vol. 14(5), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:5:p:1297-:d:506795
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    References listed on IDEAS

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    1. Kyung-Hee Lee & Yong-Gu Lee & Jaegwan Shin & Kangmin Chon & Sang-Ho Lee, 2020. "Selective Immobilization of Antimony Using Brucite-rich Precipitate Produced during In Situ Hypochlorous Acid Formation through Seawater Electrolysis in a Nuclear Power Plant," Energies, MDPI, vol. 13(17), pages 1-11, August.
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    Cited by:

    1. María Alejandra Décima & Simone Marzeddu & Margherita Barchiesi & Camilla Di Marcantonio & Agostina Chiavola & Maria Rosaria Boni, 2021. "A Review on the Removal of Carbamazepine from Aqueous Solution by Using Activated Carbon and Biochar," Sustainability, MDPI, vol. 13(21), pages 1-50, October.
    2. Gyuhyeon Kim & Young Mo Kim & Su Min Kim & Hyun Uk Cho & Jong Moon Park, 2021. "Magnetic Steel Slag Biochar for Ammonium Nitrogen Removal from Aqueous Solution," Energies, MDPI, vol. 14(9), pages 1-12, May.

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