Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Surface Modification of Phosphoric Acid-activated Carbon in Spent Coffee Grounds to Enhance Cu(II) Adsorption from Aqueous Solutions

  • Choi, Suk Soon (Department of Biological and Environmental Engineering, Semyung University) ;
  • Choi, Tae Ryeong (Department of Environmental Safety System Engineering, Semyung University) ;
  • Choi, Hee-Jeong (Department of Biomedical Sciences, Catholic Kwandong University)
  • Received : 2021.09.06
  • Accepted : 2021.09.17
  • Published : 2021.10.10
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Abstract

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

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2021R111A305924311) and the Korea Ministry Environment (MOE) as Waste to Energy-Recycling Human Resource Development Project.

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