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首页> 外文期刊>RSC Advances >A potentially low-cost modified sawdust (MSD) effective for rapid Cr(VI) and As(V) removal from water
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A potentially low-cost modified sawdust (MSD) effective for rapid Cr(VI) and As(V) removal from water

机译：一种潜在的低成本改性木屑（MSD），可有效快速去除水中的Cr（VI）和As（V）

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摘要

The study was carried out to evaluate the effectiveness of a diethylenetriamine (DETA)-crosslinked adsorbent prepared from pine sawdust for removing Cr(VI) and As(V) from aqueous solutions. The maximum adsorption capacity of Cr(VI) and As(V) by MSD was highly enhanced from 7.04 mg L-1 to 238.6 mg g(-1) and from 4.88 to 71.23 mg g(-1) at pH 6.0, respectively. The surface characterization of the MSD proved that the grafted amino groups were responsible for the good affinity towards Cr(VI) and As(V). The uptake of Cr(VI) and As(V) was highly dependent on the pH and was facilitated in acidic solutions. Batch experiments were conducted as a function of pH, temperature and contact time. Both Cr(VI) and As(V) adsorption equilibrium could be quickly attained within 1 h and the process followed the Redlich-Peterson isotherm model. As(V) uptake was more sensitive to an individual coexisting anion (Cl , SO42-, NO3-, HCO3-) in the system than Cr(VI). The mechanism of adsorption was characterized by the electrostatic attraction between the positively charged surface of sawdust and Cr(VI)/As(V) anions.
机译：进行了这项研究，以评估由松木屑制备的二亚乙基三胺（DETA）交联吸附剂从水溶液中去除Cr（VI）和As（V）的有效性。 MSD对Cr（VI）和As（V）的最大吸附容量分别在pH 6.0时从7.04 mg L-1分别提高到238.6 mg g（-1）和4.88-71.23 mg g（-1）。 MSD的表面特征证明，接枝的氨基对Cr（VI）和As（V）具有良好的亲和力。 Cr（VI）和As（V）的吸收高度依赖于pH值，并且在酸性溶液中也很容易吸收。分批实验根据pH，温度和接触时间进行。 Cr（VI）和As（V）的吸附均能在1 h内迅速达到平衡，该过程遵循Redlich-Peterson等温模型。与Cr（VI）相比，系统中的一种单独吸收的阴离子（Cl，SO42-，NO3-，HCO3-）对As（V）的吸收更为敏感。吸附机理的特征在于锯末带正电的表面与Cr（VI）/ As（V）阴离子之间的静电吸引。

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