头孢菌素残留及其衍生炭从水溶液中去除六价铬的行为和机制。
Removal behaviors and mechanisms of hexavalent chromium from aqueous solution by cephalosporin residue and derived chars.
机构信息
School of Environmental Science and Engineering, Qilu University of Technology, Jinan 250353, China.
School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan 250353, China.
出版信息
Bioresour Technol. 2017 Aug;238:484-491. doi: 10.1016/j.biortech.2017.04.081. Epub 2017 Apr 23.
Cephalosporin residue (CR) was used to produce biochar (BC) and activated carbon (AC) at 600°C (BC600 and AC600). To compare the removal behaviors and mechanisms of Cr(VI) by CR and derived chars, batch adsorption tests were performed in Cr(VI) microenvironment like pH, Cr(VI) concentration, adsorbent dosage, combing with the characterization of adsorbents before and after adsorption. Fourier transform-infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and Brunauer-Emmett-Teller (BET) techniques were used. Results showed that the Cr(VI) removals by CR and CR-chars fitted Freundlich and Langmuir models. Based on the Langmuir model, the maximum adsorption capacities of CR, BC600 and AC600 towards Cr(VI) were 107.41, 88.19 and 74.07mgg, respectively. The CR rich in dissolved carbon (DOC), -NH and -COOH, chiefly acted as chelating and reducing agents, while the AC600 with high surface area mainly supported Cr(VI) adsorption during Cr(VI) removal process.
头孢菌素残留（CR）被用于在 600°C 下生产生物炭（BC）和活性炭（AC）（BC600 和 AC600）。为了比较 CR 和衍生炭对六价铬（Cr(VI)）的去除行为和机制，在类似于 pH 值、Cr(VI)浓度、吸附剂用量的 Cr(VI)微环境中进行了批量吸附试验，并结合吸附前后的吸附剂特性进行了研究。采用傅里叶变换红外光谱（FT-IR）、X 射线衍射（XRD）、扫描电子显微镜（SEM）、能谱（EDS）和 Brunauer-Emmett-Teller（BET）技术。结果表明，CR 和 CR-炭对 Cr(VI)的去除符合 Freundlich 和 Langmuir 模型。根据 Langmuir 模型，CR、BC600 和 AC600 对 Cr(VI)的最大吸附容量分别为 107.41、88.19 和 74.07mgg。富含溶解态碳（DOC）、-NH 和 -COOH 的 CR 主要作为螯合剂和还原剂，而具有高比表面积的 AC600 在 Cr(VI)去除过程中主要支持 Cr(VI)吸附。
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