It is crucial for the environment, the economy, and society to create low-cost adsorbents from renewable resources to remove phosphate from aqueous effluents. Here, two renewablecarbon and nitrogen sources (Douglas fir and Chitosan) were used to produce engineered -doped biochars modified with Mg for PO adsorption. Mg–N doped biochars were prepared using an impregnation-carbonization process. A central composite experimental design was used to select combinations of independent variables to maximize phosphate adsorption capacity. Phosphate adsorption isotherms were fitted with Langmuir and Freundlich isotherms. The biochar produced at 700 C, 12 wt % MgCl and Douglas Fir/Chitosan ratio: 1/1, which has the highest PO adsorption capacity, was further studied. Proximate analysis, elemental composition, surface area, pore size distribution, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy (FTIR), and Scanning electron microscopy combined with energy-dispersive X-ray spectroscopy (SEM-EDX) were used to characterize this biochar. This biochar has an adsorption capacity of 112.4 mg PO/g char. Its phosphate adsorption rate was adjusted to a pseudo-second-order kinetic model. The phosphate adsorption capacity of the biochar produced was comparable with the most effective biochar reported in the literature.

中文翻译：

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利用可再生资源生产用于磷酸盐吸附的 N-Mg 掺杂生物炭


利用可再生资源制造低成本吸附剂以去除废水中的磷酸盐，对环境、经济和社会至关重要。在这里，两种可再生碳源和氮源（花旗松和壳聚糖）被用来生产经 Mg 改性的工程掺杂生物炭，用于 PO 吸附。采用浸渍碳化工艺制备镁氮掺杂生物炭。使用中心复合实验设计来选择自变量的组合，以最大化磷酸盐吸附能力。磷酸盐吸附等温线符合 Langmuir 和 Freundlich 等温线。进一步研究了在 700 C、12 wt% MgCl、花旗松/壳聚糖比例为 1/1 时生产的生物炭，其具有最高的 PO 吸附能力。使用工业分析、元素组成、表面积、孔径分布、X射线光电子能谱、傅里叶变换红外光谱（FTIR）和扫描电子显微镜结合能量色散X射线光谱（SEM-EDX）来表征这种生物炭。该生物炭的吸附能力为 112.4 mg PO/g 炭。其磷酸盐吸附速率调整为准二级动力学模型。所生产的生物炭的磷酸盐吸附能力与文献报道的最有效的生物炭相当。