在铁杉生物炭上分散的 α-FeO 和 FeO 对水中硝酸盐和氟化物的快速吸附和磁分离。
Fast nitrate and fluoride adsorption and magnetic separation from water on α-FeO and FeO dispersed on Douglas fir biochar.
机构信息
Department of Chemistry, Mississippi State University, Starkville, MS 39762, United States.
School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India.
出版信息
Bioresour Technol. 2018 Sep;263:258-265. doi: 10.1016/j.biortech.2018.05.001. Epub 2018 May 2.
α-FeO and FeO dispersed on high surface area (663 m/g) Douglas fir biochar (BC) was prepared for fast nitrate and fluoride ion removal from water using magnetic separations. This biochar, made originally at 900 °C, was impregnated with FeCl and converted by pyrolysis at 600 °C to magnetic (494 m/g) biochar (MBC). MBC and its precursor BC were characterized using SEM, SEM-EDX, STEM, S, PZC measurements, XRD analysis, and XPS. Dispersed α-FeO and FeO particles caused magnetization and generated most adsorption sites, causing more nitrate and fluoride uptake than BC. Both nitrate and fluoride adsorption on MBC remained high over a pH range from 2 to 10. Sorption was evaluated from 298 to 318 K using the Langmuir and Freundlich isotherm models. Langmuir adsorption capacities were 15 mg/g for nitrate and 9 mg/g for fluoride, higher capacities than those reported for other biochar and iron oxide adsorbents.
α-FeO 和 FeO 分散在高表面积（663 m/g）的花旗松生物炭（BC）上，用于通过磁分离从水中快速去除硝酸盐和氟离子。这种生物炭最初是在 900°C 下制备的，用 FeCl 浸渍，并在 600°C 下通过热解转化为磁性（494 m/g）生物炭（MBC）。使用 SEM、SEM-EDX、STEM、S、PZC 测量、XRD 分析和 XPS 对 MBC 及其前体 BC 进行了表征。分散的 α-FeO 和 FeO 颗粒引起磁化并产生了大多数吸附位点，导致比 BC 更多的硝酸盐和氟化物被吸收。MBC 对硝酸盐和氟化物的吸附在 pH 值为 2 至 10 的范围内均保持较高水平。使用 Langmuir 和 Freundlich 等温线模型从 298 到 318 K 评估了吸附。硝酸盐的 Langmuir 吸附容量为 15 mg/g，氟化物的吸附容量为 9 mg/g，高于其他生物炭和氧化铁吸附剂的报道容量。
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