蛋壳钙功能化油菜秸秆生物炭对磷的吸附特性及机制。
Characteristics and mechanisms of phosphorous adsorption by rape straw-derived biochar functionalized with calcium from eggshell.
机构信息
Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, College of Engineering, Huazhong Agricultural University, No. 1, Shizishan Street, Hongshan District, Wuhan 430070, PR China; Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA.
Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, College of Engineering, Huazhong Agricultural University, No. 1, Shizishan Street, Hongshan District, Wuhan 430070, PR China.
出版信息
Bioresour Technol. 2020 Dec;318:124063. doi: 10.1016/j.biortech.2020.124063. Epub 2020 Sep 2.
Biochar modified with calcium source is acted as an effective adsorbent for phosphorous recovery. In this research, eggshell is used as a low-cost and environmentally friendly calcium source to replace chemical reagents such as CaCO, Ca(OH) and CaCl used in the modified biochar production. Biochar derived from rape straw and modified with eggshell shows prominent phosphorous adsorption performance (e.g., equilibrium adsorption amount, 109.7 mg/g). The kinetic and isotherm analysis demonstrate that chemical adsorption process is performed as the main controlled step for the modified biochar adsorption, and the phosphate adsorption process is composed of both monolayer adsorption and multi-layer adsorption. Moreover, it is found from the physicochemical structures comparison before and after phosphate adsorption that Ca-P precipitation, hydrogen bonding and electrostatic attraction are identified as main adsorption mechanisms. In addition, the adsorbed phosphates are mainly distributed inside the space with pore sizes of 15-50 nm.
生物炭经钙源改性后可用作回收磷的有效吸附剂。本研究以蛋壳作为一种低成本且环保的钙源，替代了改性生物炭生产中使用的化学试剂，如 CaCO3、Ca(OH)2 和 CaCl2。由油菜秸秆制备的并经蛋壳改性的生物炭表现出突出的磷吸附性能（例如，平衡吸附量为 109.7mg/g）。动力学和等温线分析表明，化学吸附过程是改性生物炭吸附的主要控制步骤，且磷酸盐的吸附过程由单层吸附和多层吸附组成。此外，通过比较吸附前后的物理化学结构发现，Ca-P 沉淀、氢键和静电吸引被确定为主要的吸附机制。此外，吸附的磷酸盐主要分布在孔径为 15-50nm 的空间内。
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