Preparation of a novel iron-based biochar composite for removal of hexavalent chromium in water
Preparation of a novel iron-based biochar composite for removal of hexavalent chromium in water
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新型铁基生物炭复合材料的制备用于去除水中六价铬
DOI：
10.1007/s11356-019-06954-6
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发表时间：
2020-03-01
影响因子：
5.8
通讯作者：
Lin, Aijun
中科院分区：
文献类型：
--
作者：
Qin, Luyao;He, Li;Lin, Aijun
将壳聚糖稳定的硫化亚铁纳米颗粒负载在生物炭上，制备复合材料FeS-CS-BC，用于有效去除水中的六价铬。通过 Brunauer-Emmett-Teller (BET)、扫描电子显微镜 (SEM)、X 射线衍射 (XRD) 和傅里叶变换红外光谱 (FTIR) 分析对 BC 和 FeS-CS-BC 进行了表征。采用批量实验来评估 Cr(VI) 的去除性能。实验结果表明，FeS-CS-BC(FeS:CS:BC = 2:2:1)对Cr(VI)的去除率达到98.34%，显着高于BC(44.58%)和FeS(79.91%)。在pH 2-10范围内，FeS-CS-BC对Cr(VI)的去除几乎与pH无关。共存阴离子(Cl-、SO42-、NO3-)对Cr(VI)去除的限制不是太明显。 FeS-CS-BC 去除 Cr(VI) 符合准二级动力学，是一种混合化学吸附反应。 X射线光电子能谱（XPS）分析结果表明，Cr(VI)被还原，还原后的Cr(VI)以Cr(VI)-Fe(III)的形式固定在材料表面。浸渍合成的FeS-CS-BC复合材料去除废水中的六价铬。
The chitosan-stabilized ferrous sulfide nanoparticles were loaded on biochar to prepare a composite material FeS-CS-BC for effective removal of hexavalent chromium in water. BC and FeS-CS-BC were characterized by Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analyses. Batch experiments were employed to evaluate the Cr(VI) removal performance. The experimental results showed that the removal rate of Cr(VI) by FeS-CS-BC(FeS:CS:BC = 2:2:1) reached 98.34%, which was significantly higher than that of BC (44.58%) and FeS (79.91%). In the pH range of 2-10, the removal of Cr(VI) by FeS-CS-BC was almost independent of pH. The limitation of coexisting anions (Cl-,SO42-,NO3-) on Cr(VI) removal was not too obvious. The removal of Cr(VI) by FeS-CS-BC was fitted with the pseudo-second-order dynamics, which was a hybrid chemical-adsorption reaction. The X-ray photoelectron spectroscopy (XPS) analysis result showed that Cr(VI) was reduced, and the reduced Cr(VI) was fixed on the surface of the material in the form of Cr(VI)-Fe(III).Removal of hexavalent chromium from wastewater by FeS-CS-BC composite synthesized by impregnation.