【摘要】 选用玉米秸秆为原材料，在无氧条件下高温热解浸渍Fe³⁺的玉米秸秆粉末，一步合成了负载纳米零价铁的玉米秸秆生物炭（B-nZVI）。通过借鉴生物包埋法，制成海藻酸钠/纳米零价铁生物炭小球（SA/B-nZVI）。通过扫描电子显微镜（SEM）、傅里叶-红外光谱（FT-IR）、X射线衍射（XRD）对SA/B-nZVI进行表征，结果表明，纳米零价铁成功负载于生物炭上，负载的纳米零价铁未发现团聚，纳米零价铁粒径约为27.6 nm,并均匀包埋于海藻酸钠小球中。用SA/B-nZVI研究了水溶液中Pb²⁺、Cu²⁺和Cd²⁺的吸附性能，在最佳吸附条件下，SA/B-nZVI对Pb²⁺、Cu²⁺和Cd²⁺的最大吸附量分别为349、147、106 mg/g。由Langmuir计算出SA/B-nZVI对Pb²⁺、Cu²⁺和Cd²⁺的理论饱和吸附容量分别为351、153、109 mg/g。重复使用5次后，SA/B-nZVI对Pb²⁺、Cu²⁺和Cd²⁺的去除率分别为87%、79%、73%。更多还原

【Abstract】 We synthesized corn stalk biochar loaded with nano-zero-valent iron（B-nZVI） in one step by high-temperature pyrolysis of corn stover powder impregnated with Fe³⁺ under anaerobic conditions. Sodium alginate/nano-zero-valent iron biochar pellets（SA/B-nZVI） were prepared by using biological embedding method. SA/B-nZVI was characterized by scanning electron microscope（SEM）, Fourier Transform Infrared Spectrometer（FT-IR） and diffraction of X-rays（XRD）, and the results showed that nano-zero-valent iron was successfully loaded on corn stover biochar, which inhibited the shortcomings of easy agglomeration. The particle size of nano-zero-valent iron was 27.6 nm and it is evenly embedded in the pellet. SA/B-nZVI can be used to study the adsorption of Pb²⁺, Cu²⁺ and Cd²⁺ in aqueous solution. The maximum adsorption capacities of SA/B-nZVI are 349, 147 and 106 mg/g, respectively, under the optimal adsorption conditions. The theoretical saturated adsorption capacities of SA/B-nZVI for Pb²⁺, Cu²⁺ and Cd²⁺ were calculated by Langmuir equation as 351, 153 and 109 mg/g, respectively. After recycling 5 times, the removal rates of Pb²⁺, Cu²⁺ and Cd²⁺ were 87%, 79% and 73%, respectively.更多还原