@article{HGNHB8_2020_v39n3_171,
author={HuiSeon. Kim and Seok-In. Yun and NanHee. An and JoungDu. Shin},
title={Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar},
journal={Korean Journal of Environmental Agriculture},
issn={1225-3537},
year={2020},
volume={39},
number={3},
pages={171-177},
doi={10.5338/KJEA.2020.39.3.20},
url={https://doi.org/10.5338/KJEA.2020.39.3.20}
TY - JOUR
AU - Kim, HuiSeon.
AU - Yun, Seok-In.
AU - An, NanHee.
AU - Shin, JoungDu.
TI - Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar
T2 - Korean Journal of Environmental Agriculture
PY - 2020
VL - 39
IS - 3
PB - The Korean Society of Environmental Agriculture
SP - 171-177
SN - 1225-3537
AB - BACKGROUND:Recently, biomass conversion from agricultural wastes to carbon-rich materials such as biochar has been recognized as a promising option to maintain or increase soil productivity, reduce nutrient losses, and mitigate greenhouse gas emissions from the agro-ecosystem. This experiment was conducted to select an optimum conditions for enhancing the NH4-N adsorption capacity of rice hull activated biochar.METHODS AND RESULTS:For deciding the proper molarity of KOH for enhancing its porosity, biochars treated with different molarity of KOH (0, 1, 2, 4, 6, 8) were carbonized at 600℃ in the reactor. The maximum adsorption capacity was 1.464 mg g-1, and an optimum molarity was selected to be 6 M KOH. For the effect of adsorption capacity to different carbonized temperatures, 6 M KOH-treated biochar was carbonized at 600℃ and 800℃ under the pyrolysis system. The result has shown that the maximum adsorption capacity was 1.76 mg g-1 in the rice hull activated biochar treated with 6 M KOH at 600℃ of pyrolysis temperature, while its non-treated biochar was 1.17 mg g-1. The adsorption rate in the rice hull activated biochar treated with 6 M KOH at 600℃ was increased at 62.18% compared to that of the control. Adsorption of NH4-N in the rice hull activated biochar was well suited for the Langmuir model because it was observed that dimensionless constant (RL) was 0.97 and 0.66 at 600℃ and 800℃ of pyrolysis temperatures, respectively. The maximum adsorption amount (qm) and the bond strength constants (b) were 0.092 mg g-1 and 0.001 mg L-1, respectively, for the rice hull activated biochar treated with 6 M KOH at 600℃ of pyrolysis.CONCLUSION:Optimum condition of rice hull activated biochar was 6M KOH at 600℃ of pyrolysis temperature.
KW - Absorption capacity
KW - Rice hull activated biochar
DO - 10.5338/KJEA.2020.39.3.20
UR - https://doi.org/10.5338/KJEA.2020.39.3.20
ER -
Kim, H., Yun, S. I., An, N., & Shin, J. (2020). Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar. Korean Journal of Environmental Agriculture, 39(3), 171-177.
Kim, H, Yun, SI, An, N & Shin, J 2020, “Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar”, Korean Journal of Environmental Agriculture, vol. 39, no. 3, pp. 171-177. Available from: doi:10.5338/KJEA.2020.39.3.20
Kim, HuiSeon et al. “Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar.” Korean Journal of Environmental Agriculture 39.3 (2020): 171-177.
1. Kim H, Yun SI, An N, Shin J. Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar. Korean Journal of Environmental Agriculture [Internet]. 2020;39(3): 171-177. Available from: doi:10.5338/KJEA.2020.39.3.20.
Kim, HuiSeon, Seok-In Yun, NanHee An and JoungDu Shin. “Effect of KOH Concentrations and Pyrolysis Temperatures for Enhancing NH4-N Adsorption Capacity of Rice Hull Activated Biochar.” Korean Journal of Environmental Agriculture 39, no.3 (2020): 171-177. doi: 10.5338/KJEA.2020.39.3.20.