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

Yong-Gu Lee, Jaegwan Shin, Jinwoo Kwak, Sangwon Kim, Changgil Son, Kyung Hwa Cho and Kangmin Chon
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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

Energies, 2021, vol. 14, issue 5, 1-15

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.

Keywords: NaOH activation; biochars; competitive adsorption; ground coffee residue; herbicides (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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