| Title |
Surface Analysis and Heavy Metal Adsorption Evaluation of Chemically Modified Biochar Derived from Starfish (Asterina pectinifera) |
| Authors |
장하린 ( Ha Rin Janga ) ; 문덕현 ( Deok Hyun Moon ) |
| DOI |
https://doi.org/10.15681/KSWE.2022.38.2.82 |
| Keywords |
Adsorption; Biochar; Heavy Metals; Modification; Starfish |
| Abstract |
In this study, chemically modified biochar (NSBP500, KSBP500, OSBP500) derived from starfish was utilized to improve the adsorption ability of the SBP500 (Starfish Biochar Pyrolyzed at 500℃) in a solution contaminated with heavy metals. According to the biochar modification performance evaluation batch tests, the removal r ate and adsorption amount of NSBP500 increased 1 .4 times f or Cu, 1 .5 times f or Cd, and 1 .2 times for Zn as compared to the control sample SBP500. In addition, the removal rate and adsorption amount of KSBP500 increased 2 times f or Cu, 1.8 times for Cd, and 1 .2 times f or Zn. The removal r ate and adsorption amount of OSBP500 increased 5.8 times for Cu. The FT-IR analysis confirmed the changes in the generation and movement of new functional groups after adsorption. SEM analysis confirmed Cu in KSBP500 was in the form of Cu(OH)2 and resembled t e structure of nanowires. The C d in K SBP500 was densely covered in cubic form of Cd(OH)2. Lead(Pb) was in the form of Pb3(OH)2(CO3)2 in a hexagonal atomic layer structure in NSBP500. In addition, it was observed that Zn was randomly covered with Zn5(CO3)2(OH)6 pieces which resembled plates in KSBP500. Therefore, this study confirmed that biochar removal efficiency was improved through a chemical modification treatment. Accordingly, adsorption and precipitation were found to be the complex mechanisms behind the improved removal efficiency in the biochar. This was accomplished by electrostatic interactions between the biochar and heavy metals and ion exchange with Ca2+. |