Effective Cr(VI) Removal from Simulated Groundwater through the Hydrotalcite-Derived Adsorbent

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• 作者：Yunfeng Xu ; Jia Zhang ; Guangren Qian ; Zhong Ren ; Zhi Ping Xu ; Yueying Wu ; Qiang Liu ; Shizhang Qiao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：March 17, 2010
• 年：2010
• 卷：49
• 期：6
• 页码：2752-2758
• 全文大小：218K
• 年卷期：v.49,no.6(March 17, 2010)
• ISSN：1520-5045

文摘

We investigated the feasibility of using calcined hydrotalcite (CHT) as the adsorbent of chromate to treat Cr(VI)-contaminated water through column tests under varied conditions. The column tests reveal that CHT can take up 34.3−44.7 mg(Cr)/g when the Cr(VI) concentration in the influent varies over a range of 50−200 mg/L (e.g., 0.96−3.85 mM) with pH 6−7 at 298 K. This uptake capacity is only reduced to 29.1 mg(Cr)/g when HCO₃⁻ (1.0 mM) and Cl⁻ (1.0 mM) coexist in the influent. We note that the treated water is of high quality and is free of Cr(VI), with Mg and Al concentrations of <5−10 mg/L, and a pH of 6.5−7.0. The quick desorption of Cr(VI) from the adsorbent (CHT) has enabled us to recover Cr(VI) from the contaminated water and regenerate the adsorbent. All these findings promise CHT as an effective regenerable adsorbent for the remediation of Cr(VI)-contaminated groundwater.