화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Applied Chemistry for Engineering, Vol.32, No.5, 589-598, October, 2021
DOI10.14478/ace.2021.1074  Export Citation
Surface Modification of Phosphoric Acid.activated Carbon in Spent Coffee Grounds to Enhance Cu(II) Adsorption from Aqueous Solutions
Suk Soon Choi1, 2, Tae Ryeong Choi2, and Hee-Jeong Choi3, †
  • 1Department of Biological and Environmental Engineering, Semyung University, Chungcheongbuk-do 27136, Republic of Korea
  • 2Department of Environmental Safety System Engineering, Semyung University, Chungcheongbuk-do 27136, Republic of Korea
  • 3Department of Biomedical Sciences, Catholic Kwandong University, Gangwoon-do 25601, Republic of Korea
E-mail:
The purpose of this study was to analyze the efficiency with which phosphorylated spent coffee grounds (PSCG) remove cationic Cu(II) ions from an aqueous solution. The pHpzc of the SCG was 6.43, but it was lowered to 3.96 in the PSCG, confirming that an acidic functional group was attached to the surface of the PSCG. According to FT-IR analysis, phosphorylation of the SCG added P=O, P-O-C (aromatic), P=OOH, and P-O-P groups to the surface of the adsorbent, and the peaks of the carboxyl and OH groups were high and broad. Also, the specific surface area, mesopore range, and ion exchange capacity increased significantly by phosphorylation. The adsorption kinetics and isothermal experiments showed that Cu(II) adsorption using SCG and PSCG was explained by PSO and Langmuir models. The maximum Langmuir adsorption capacity of SCG and PSCG was 42.23 and 162.36 mg/g, respectively. The adsorption process of both SCG and PSCG was close to physical adsorption and endothermic reaction in which the adsorption efficiency increased with temperature. PSCG was very effective in adsorbing Cu(II) in aqueous solution, which has great advantages in terms of recycling resources and adsorbing heavy metals using waste materials.
Keywords:Adsorption;Copper removal;Kinetic;Phosphoric acid;Spent coffee grounds
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