Direct discharge of water containing excessive nitrogen and phosphorus concentrations into the aquatic environment can lead to loss of resources and eutrophication. Biochar prepared by thermochemical treatment of feedstocks, particularly the metal modified biochar, which can be used as a new adsorbent for aquatic environmental treatment. Herein, a novel panda manure biochar (PMBC) modified by carboxymethyl cellulose (CMC) stabilized nano zero-valent zinc (nZVZ-CMC-PMBC) was developed and applied for efficiently removal of NH₄⁺and PO₄^3-. Batch sorption experiments verified the kinetics and equilibrium isotherms of NH₄⁺ and PO₄^3- adsorption, the results showed that PMBC had significantly better adsorption performance on nitrogen and phosphorus compared to bamboo biochar. Moreover nZVZ-CMC-PMBC demonstrated maximum theoretical adsorption capacities of 40.31 mg•g^-1 NH₄⁺-N and 154.30 mg•g^-1 total phosphorus (TP). Characterization result of SEM-EDS, BET, FTIR, XRD and XPS reveal that PMBC had larger specific surface area and pore diameter than bamboo biochar which confirmed that PMBC contained more adsorption sites. As for nZVZ-CMC-PMBC, crystalline nZVZ flakes are dispersed and impregnated into the frame of CMC-nZVZ- PMBC composite, characterization analysis unveiled the formed complexes on its surface. Therefore, the adsorption mechanism of nZVZ-CMC-PMBC for NH₄⁺-N and TP mainly involved Zn²⁺ precipitates, surface electrostatic attraction and surface complexation.

将氮和磷浓度过高的水直接排放到水生环境中会导致资源损失和富营养化。通过原料热化学处理制备的生物炭，特别是金属改性的生物炭，可以用作水生环境处理的新型吸附剂。在此，开发了一种新型的经羧甲基纤维素（CMC）稳定的纳米零价锌（nZVZ-CMC-PMBC）改性的熊猫粪便生物炭（PMBC），并将其用于有效去除NH ₄ ⁺和PO ₄ ^3-。间歇吸附实验验证了NH ₄ ⁺和PO ₄ ^3-的动力学和平衡等温线。结果表明，与竹生物炭相比，PMBC对氮和磷的吸附性能明显更好。此外，nZVZ-CMC-PMBC的最大理论吸附容量为40.31 mg•g ^-1 NH ₄ ⁺ -N和154.30 mg•g ^-1总磷（TP）。SEM-EDS，BET，FTIR，XRD和XPS的表征结果表明，PMBC比竹炭具有更大的比表面积和孔径，这证明PMBC包含更多的吸附位。对于nZVZ-CMC-PMBC，结晶nZVZ薄片被分散并浸渍到CMC-nZVZ-PMBC复合材料的框架中，特性分析揭示了其表面形成的复合物。因此，nZVZ-CMC-PMBC对NH的吸附机理₄ ⁺ -N和TP主要涉及Zn ²⁺沉淀，表面静电吸引和表面络合。