| Title |
Comparative Evaluation of Methylene Blue and Humic Acids Removal Efficiency Using Rice Husk Derived Biochars and Powdered Activated Carbon |
| Authors |
이주원 ( Lee Juwon ) ; 정은주 ( Jeong Eunju ) ; 이정민 ( Lee Jungmin ) ; 이용구 ( Lee Yong-Gu ) ; 전강민 ( Chon Kangmin ) |
| DOI |
https://doi.org/10.15681/KSWE.2021.37.6.483 |
| Keywords |
Adsorption; Humic acids; Methylene blue; Powdered activated carbon; Rice husk biochar |
| Abstract |
This study evaluated the removal efficiencies of methylene blue (MB) and humic acids (HA) using a rice husk (RH) biochar and powdered activated carbon (PAC). The pseudo-second-order model better presented the adsorption of MB and HA onto a RH biochar than the pseudo-first-order model. Furthermore, better description of the adsorption behavior of MB and HA by the Langmuir isotherm model (R2 of the RH biochar: MB = 0.986 and HA = 0.984; R2 of PAC: MB = 0.997 and HA = 0.989) than the Freundlich isotherm model (R2 of the RH biochar: MB = 0.955 and HA = 0.965; R2 of PAC: MB = 0.982 and HA = 0.973) supports the assumption that monolayer adsorption played key roles in the removal of MB and HA using the RH biochar and PAC. Batch experiments were performed on the effects of dosage, temperature, and pH. For all experiments, PAC showed higher efficiencies than RH biochar and MB adsorption efficiencies were higher than those of HA. Adsorption efficiencies increased with increasing amounts of adsorbents and temperature. As the pH increased, adsorption efficiencies of MB were increased while adsorption efficiencies of HA were decreased. |