State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Key Laboratory of Yangtze Water Environment, Ministry of Education, Tongji University, Shanghai 200092, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; Key Laboratory of Yangtze Water Environment, Ministry of Education, Tongji University, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, PR China.
Sci Total Environ. 2024 Jan 1;906:167293. doi: 10.1016/j.scitotenv.2023.167293. Epub 2023 Sep 22.
Magnesium-functionalized Magnolia grandiflora Linn leaf-derived biochar (MBC) capable of efficiently reclaiming phosphorus from urine was synthesized by slow co-pyrolysis. Four adsorption kinetic and seven adsorption isotherm models were fitted to the batch adsorption and desorption experimental data, and it was found that pseudo-first-order kinetic model and multilayer model with saturation best described the phosphate-phosphorus (PO-P) adsorption process by MBC. MBC and phosphorus-saturated MBC (P-MBC) were found to offer outstanding phosphorus adsorption and slow release properties, respectively. Based on material characterization, statistical physics, adsorption energy distribution and statistical thermodynamics, a multi-ionic, inclined orientation, entropy-driven spontaneous endothermic process of MBC on PO-P was proposed, involving physicochemical interactions (porous filling, electrostatic attraction, ligand exchange and surface precipitation). Further, seed germination and early seedling growth experiments proved that P-MBC can be used as a slow-release fertilizer. Overall, MBC offers prospective applications as an efficient phosphorus adsorbent and then as a slow-release fertilizer.
通过慢速共热解合成了一种功能化镁的玉兰叶衍生生物炭（MBC），可有效从尿液中回收磷。将四种吸附动力学和七种吸附等温线模型拟合到批量吸附和解吸实验数据中，结果表明，准一级动力学模型和多层模型与饱和模型最能描述 MBC 对磷酸盐磷（PO-P）的吸附过程。MBC 和磷饱和的 MBC（P-MBC）分别表现出优异的磷吸附和缓慢释放性能。基于材料表征、统计物理学、吸附能分布和统计热力学，提出了 MBC 对 PO-P 的多离子、倾斜取向、熵驱动的自发吸热过程，涉及物理化学相互作用（多孔填充、静电吸引、配体交换和表面沉淀）。此外，种子发芽和早期幼苗生长实验证明，P-MBC 可用作缓释肥料。总的来说，MBC 有望作为一种高效的磷吸附剂，然后作为一种缓释肥料。
