A novel material that nano zero valent iron (nZVI) loaded on biochar with stable starch stabilization (nZVI/SS/BC) was synthesized and used for the removal of hexavalent chromium [Cr(VI)] in simulated wastewater. It was indicated that as the pyrolysis temperature of rice straw increased, the removal rate of Cr(VI) by nZVI/SS/BC first increased and then decreased. nZVI/SS/BC made from biochar pyrolyzed at 600 °C (nZVI/SS/BC600) had the highest removal efficiency and was suitable for a wide pH range (pH 2.1–10.0). The results showed that 99.67% of Cr(VI) was removed by nZVI/SS/BC600, an increase of 45.93% compared to the control group, which did not add soluble starch during synthesis. The pseudo-second-order model and the Langmuir model were more in line with reaction. The maximum adsorption capacity for Cr(VI) by nZVI/SS/BC600 was 122.86 mg·g⁻¹. The properties of the material were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) mapping, Brunauer-Emmett-Teller (BET), Fourier-transform infrared (FTIR), and X-ray diffraction (XRD). The results showed that the nZVI particles were uniformly supported on the biochar, and the BET surface areas of nZVI/SS/BC was 40.4837 m²·g⁻¹, an increase of 8.79 times compared with the control group. Mechanism studies showed that soluble starch reduced the formation of metal oxides, thereby improving the reducibility of the material, and co-precipitates were formed during the reaction. All results indicated that nZVI/SS/BC was a potential repair material that can effectively overcome the limitations of nZVI and achieve efficient and rapid repair of Cr(VI).

合成了一种新型的材料，该材料将纳米零价铁（nZVI）负载在具有稳定淀粉稳定性的生物炭上（nZVI / SS / BC），并用于去除模拟废水中的六价铬[Cr（VI）]。结果表明，随着稻草热解温度的升高，nZVI / SS / BC对Cr（VI）的去除率先升高后降低。在600°C下热解的生物炭制成的nZVI / SS / BC（nZVI / SS / BC600）具有最高的去除效率，适用于广泛的pH范围（pH 2.1–10.0）。结果表明，nZVI / SS / BC600去除了99.67％的Cr（VI），与对照组相比增加了45.93％，而对照组在合成过程中未添加可溶性淀粉。伪二级模型和Langmuir模型更符合反应。nZVI / SS / BC600对Cr（VI）的最大吸附容量为122.86 mg·g^-1。通过扫描电子显微镜（SEM），能量色散光谱（EDS）作图，Brunauer-Emmett-Teller（BET），傅立叶变换红外（FTIR）和X射线衍射（XRD）分析了材料的性能。结果表明，nZVI颗粒均匀地负载在生物炭上，nZVI / SS / BC的BET表面积为40.4837 m ² ·g ^-1，与对照组相比增加了8.79倍。机理研究表明，可溶性淀粉减少了金属氧化物的形成，从而提高了材料的还原性，并且在反应过程中形成了共沉淀物。所有结果表明，nZVI / SS / BC是一种潜在的修复材料，可以有效克服nZVI的局限性，并实现对Cr（VI）的高效快速修复。