Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea.
R&D Institute of Radioactive Wastes, Korea Radioactive Waste Agency, 174 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea.
J Hazard Mater. 2022 Aug 15;436:129245. doi: 10.1016/j.jhazmat.2022.129245. Epub 2022 May 27.
Buckwheat hull-derived biochar (BHBC) beads were synthesized by immobilizing biochar powder with alginate. Due to their cation-exchange ability, abundant functional groups, microporous structure, and large surface area, BHBC beads were successfully applied for the removal of cobalt from aqueous solution. The adsorption behavior followed pseudo-second-order kinetics and the Langmuir isotherm model showed a better fit to adsorption data than the Freundlich or Temkin isotherm models. The maximum adsorption capacity of BHBC beads was 24.0 mg/g at pH 5, 35 °C, and an initial cobalt concentration of 1.0 g/L, which was higher than those of previously reported natural resource-based adsorbents. In a fixed-bed column study, the effects of operating parameters such as flow rate, bed height, and bed diameter were investigated. Both the Thomas and Yoon-Nelson models were applied to the experimental data to predict the breakthrough curves using nonlinear regression. Overall, BHBC beads can be used as an efficient adsorbent for removal of radioactive cobalt from aqueous solution.
荞麦壳衍生生物炭 (BHBC) 珠粒是通过用海藻酸钠固定生物炭粉末合成的。由于其阳离子交换能力、丰富的官能团、微孔结构和大的表面积，BHBC 珠粒成功地应用于从水溶液中去除钴。吸附行为遵循拟二级动力学，Langmuir 等温模型比 Freundlich 或 Temkin 等温模型更能拟合吸附数据。在 pH 5、35°C 和初始钴浓度为 1.0 g/L 的条件下，BHBC 珠粒的最大吸附容量为 24.0 mg/g，高于先前报道的天然资源基吸附剂。在固定床柱研究中，考察了流速、床层高度和床层直径等操作参数的影响。Thomas 和 Yoon-Nelson 模型都被应用于实验数据，通过非线性回归来预测穿透曲线。总的来说，BHBC 珠粒可用作从水溶液中去除放射性钴的高效吸附剂。
