吸附
生物炭
化学
稻草
磷酸盐
沼气
弗伦德利希方程
泥浆
朗缪尔
朗缪尔吸附模型
无机化学
核化学
废物管理
有机化学
环境工程
热解
工程类
作者
Xiaomei Wang,M.-L. Ye,Jinglong Wang,Feilong Wu,Cenwei Liu,Z. Li,Lin Ding,Ri‐Long Yang
出处
期刊:PLOS ONE
[Public Library of Science]
日期:2023-08-25
卷期号:18 (8): e0290714-e0290714
标识
DOI:10.1371/journal.pone.0290714
摘要
The utilization of biogas slurry is critical for the sustainable development of animal husbandry. Biomass carbon adsorption is a feasible method for the recycling of nutrients from biogas slurry. However, research on the co-adsorption of ammonia nitrogen and phosphate is scarce. Herein, soybean straw was utilized as the raw material to prepare Ca 2+ -modified biochar (CaSSB), which was investigated for its ammonia nitrogen and phosphate adsorption mechanisms. Compared with natural biochar (SSB), CaSSB possesses a high H/C ratio, larger surface area, high porosity and various functional groups. Ca 2+ -modified soybean straw biochar exhibited excellent adsorption performance for NH 4 + –N (103.18 mg/g) and PO 4 3− −P (9.75 mg/g) at pH = 6, using an adsorbent dosage of 2 g/L. The experimental adsorption data of ammonia nitrogen by CaSSB corresponded to pseudo-second-order kinetics and the Langmuir isotherm model, suggesting that the adsorption process was homogeneous and that electrostatic attraction might be the primary adsorption mechanism. Meanwhile, the adsorption of phosphate conformed to pseudo-second-order kinetics and the Langmuir–Freundlich model, whose mechanism might be attributed to ligand exchange and chemical precipitation. These results reveal the potential of CaSSBs as a cost-effective, efficient adsorbent for the recovery of ammonium and phosphate from biogas slurry.
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