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<p>Cadmium ions (Cd(II)) contamination has raised serious concerns because of its high toxicity and potential threat to the ecosystems and human health. The purpose of this study was to design a novel eco-friendly adsorbent for Cd(II) adsorption. The corn husk fibers modified with acrylic acid (CHF@AA) was synthesized and characterized in detail. The effects of pH, dosage, adsorption time, and temperature on the removal efficiency of Cd(II) on CHF@AA were discussed. The maximum removal rate of Cd(II) on CHF@AA was 88.30% at the optimal conditions (adsorbent dosage of 0.25&#xa0;g/L, adsorption time of 900&#xa0;min, temperature of 313&#xa0;K and pH of 6). Langmuir isotherms (R<sup>2</sup> = 0.9988) and Pseudo-second-order (R<sup>2</sup> = 0.9744) kinetic models were more suitable for the description of Cd(II) adsorption process on CHF@AA. The adsorption process of Cd(II) exhibited monolayer adsorption, mainly dominated by chemical adsorption. The maximum adsorption capacity for Cd(II) reached 32.63&#xa0;mg/g. Finally, CHF@AA adsorbent was used to remove Cd(II) from natural water samples of the typical traffic locations in Wuxi Huishan section of Xicheng Canal, and the maximum Cd(II) removal rate was 37.45%. Overall, this work provided a novel conversion method of discarded corn husks into adsorbent resource for the removal of cadmium ions from water samples.</p>

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Abundant Binding Sites Introduced Biomass Grafted Acrylic Acid Adsorption and Rapid Removal of Cadmium Ions from Actual River Water Samples

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Xiaoying Zhang,
  • Jiayi Hua,
  • Yao Zhu,
  • Xiaolin Ding,
  • Qingyun Zhang,
  • Tao Zhang,
  • Dongya Yang,
  • Fengxian Qiu

摘要

Cadmium ions (Cd(II)) contamination has raised serious concerns because of its high toxicity and potential threat to the ecosystems and human health. The purpose of this study was to design a novel eco-friendly adsorbent for Cd(II) adsorption. The corn husk fibers modified with acrylic acid (CHF@AA) was synthesized and characterized in detail. The effects of pH, dosage, adsorption time, and temperature on the removal efficiency of Cd(II) on CHF@AA were discussed. The maximum removal rate of Cd(II) on CHF@AA was 88.30% at the optimal conditions (adsorbent dosage of 0.25 g/L, adsorption time of 900 min, temperature of 313 K and pH of 6). Langmuir isotherms (R2 = 0.9988) and Pseudo-second-order (R2 = 0.9744) kinetic models were more suitable for the description of Cd(II) adsorption process on CHF@AA. The adsorption process of Cd(II) exhibited monolayer adsorption, mainly dominated by chemical adsorption. The maximum adsorption capacity for Cd(II) reached 32.63 mg/g. Finally, CHF@AA adsorbent was used to remove Cd(II) from natural water samples of the typical traffic locations in Wuxi Huishan section of Xicheng Canal, and the maximum Cd(II) removal rate was 37.45%. Overall, this work provided a novel conversion method of discarded corn husks into adsorbent resource for the removal of cadmium ions from water samples.