Center for Water Resources Cycle Research, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, South Korea.
Civil and Environmental Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea.
Bioresour Technol. 2016 Jul;211:108-16. doi: 10.1016/j.biortech.2016.03.066. Epub 2016 Mar 15.
In this work, granular biochar, Laminaria japonica-derived biochar (LB)-calcium alginate beads (LB-CAB), was successfully prepared by dropping a mixture of powder biochar and alginate solution into a calcium chloride solution for phosphate adsorption. Among different marine macroalgae derived biochars, LB exhibited the best performance, showing a phosphate removal rate of 97.02%, which was attributed to its high Ca/P and Mg/P ratios. With increasing pyrolysis temperature up to 600°C, the physicochemical properties of LB became suitable for adsorbing phosphate. Experimental results of kinetics and equilibrium isotherms at different temperatures (10-30°C) showed that the phosphate adsorption process is endothermic and is mainly controlled by external mass transfer and the intraparticle diffusion rate. The maximum adsorption capacity was found to be 157.7mgg(-1) at 30°C, as fitted by the Langmuir-Freundlich model, which is higher than capacities of other powder form of biochars.
在这项工作中，通过将粉末生物炭和藻酸盐溶液滴入氯化钙溶液中，成功制备了颗粒状生物炭、海带衍生生物炭（LB）-海藻酸钠珠（LB-CAB），用于吸附磷酸盐。在不同的海洋大型藻类衍生生物炭中，LB 表现出最好的性能，磷酸盐去除率达到 97.02%，这归因于其高 Ca/P 和 Mg/P 比。随着热解温度升高至 600°C，LB 的物理化学性质变得适合吸附磷酸盐。在不同温度（10-30°C）下进行的动力学和平衡等温线实验结果表明，磷酸盐吸附过程是吸热的，主要受外部传质和颗粒内扩散速率控制。在 30°C 下，最大吸附容量为 157.7mgg(-1)，符合 Langmuir-Freundlich 模型，高于其他粉末形式生物炭的容量。
