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首页> 外文期刊>RSC Advances >Removal of phosphate and chromium(vi) from liquids by an amine-crosslinked nano-Fe3O4 biosorbent derived from corn straw
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Removal of phosphate and chromium(vi) from liquids by an amine-crosslinked nano-Fe3O4 biosorbent derived from corn straw

机译：通过胺交联的纳米Fe3O4生物吸收剂从液体中除去磷酸盐和铬（VI）

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摘要

A magnetic biocomposite based bio-sorbent (corn straw) was prepared after in situ co-precipitation with Fe ~(2+) and Fe ~(3+) solutions and amine functionalization. The characteristics of amine cross-linked magnetic corn straw (ACMCS), spent samples after phosphate and Cr( VI ) adsorption, and regeneration samples were evaluated by VSM, TEM, SEM, FTIR, XRD and XPS. Adsorption tests of phosphate and Cr( VI ) were also conducted. The TEM images in accord with the VSM results showed that a high number of Fe _(3) O _(4) particles had been introduced onto the skeleton of corn straw. The XPS results indicated the existence of interactions between amine groups and phosphate/Cr( VI ) and low losses of Fe and N in the regenerated adsorbent. Kinetic models showed the rate-limiting step to be chemisorption involving valence forces through sharing or exchange of electrons between adsorbate and adsorbent. After three adsorption–desorption cycles (HCl and NaOH as eluents), there was only a slight loss in adsorption capacity of Cr( VI ) and phosphate; this demonstrated that the magnetic biocomposite was renewable in a continuous adsorption process.
机译：用Fe〜（2+）和Fe〜（3+）溶液和胺官能化原位共沉淀后制备磁性生物复合材料的生物吸附剂（玉米秸秆）。通过VSM，TEM，SEM，SEM，FTIR，XRD和XPS评估磷酸盐和Cr（VI）吸附后的胺交联磁性玉米秸秆（ACMCs）的特性，以及Cr（VI）吸附和再生样品。还进行了磷酸盐和Cr（VI）的吸附试验。符合VSM结果的TEM图像显示，已经将大量Fe _（3）O _（4）颗粒引入玉米秸秆的骨架上。 XPS结果表明，在再生吸附剂中，胺基和磷酸盐/ Cr（VI）与磷酸盐/ Cr（VI）之间的相互作用以及低损耗。动力学模型显示了通过在吸附物和吸附剂之间的电子分享或交换电子来涉及价力的化学吸取的速率限制步骤。在吸附 - 解吸循环（HCl和NaOH作为洗脱液）后，Cr（VI）和磷酸盐的吸附容量仅略有损失;这证明磁性生物复合材料在连续吸附过程中可再生。

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