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<p>Nowadays, the treatment of polluted water resources, a critical threat to ecological balance and human health, remains a global research priority. In this study, we employed the coprecipitation method to prepare itaconic acid-modified calcium-aluminum layered double hydroxides (IA-Ca-Al-LDHs), focusing on the adsorption performance of IA-Ca-Al-LDHs toward Congo red and Crystal violet. We systematically investigated the influence of LDHs dosage, pH, initial concentration of dye, adsorption time, and temperature on removal efficiency and adsorption capacity, combining characterizations via TEM, EDS, FTIR, and XRD. Under the optimal experimental conditions, compared to unmodified Ca-Al-LDHs, IA-Ca-Al-LDHs exhibited 20.57% higher removal efficiency for Congo red and 1.4% higher efficiency for Crystal violet, achieving 88.3% and 99.37% removal rates, respectively. Adsorption kinetics indicated that the adsorption processes of both materials on the target dyes fit well with both the pseudo-first-order and pseudo-second-order kinetic models. Adsorption processes were primarily chemical adsorption, accompanied by secondary physical adsorption, and IA-Ca-Al-LDHs exhibited a higher fitting degree. Mechanistically, IA-Ca-Al-LDHs features enhanced surface negative charges and expanded interlayer spacing from the modification, underlying its superior adsorption performance. This study highlights the significant potential of itaconic acid-modified Ca-Al-LDHs synthesized via coprecipitation in the efficient treatment of dye wastewater.</p>

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Itaconic Acid Modified Ca-Al Layered Double Hydroxides for enhanced Adsorption of Congo red and Crystal violet

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Zhaomin Sang,
  • Ming Ou,
  • Qinghua Jia,
  • Jiaquan Ma,
  • Youjie Zhang,
  • Yaling Lu

摘要

Nowadays, the treatment of polluted water resources, a critical threat to ecological balance and human health, remains a global research priority. In this study, we employed the coprecipitation method to prepare itaconic acid-modified calcium-aluminum layered double hydroxides (IA-Ca-Al-LDHs), focusing on the adsorption performance of IA-Ca-Al-LDHs toward Congo red and Crystal violet. We systematically investigated the influence of LDHs dosage, pH, initial concentration of dye, adsorption time, and temperature on removal efficiency and adsorption capacity, combining characterizations via TEM, EDS, FTIR, and XRD. Under the optimal experimental conditions, compared to unmodified Ca-Al-LDHs, IA-Ca-Al-LDHs exhibited 20.57% higher removal efficiency for Congo red and 1.4% higher efficiency for Crystal violet, achieving 88.3% and 99.37% removal rates, respectively. Adsorption kinetics indicated that the adsorption processes of both materials on the target dyes fit well with both the pseudo-first-order and pseudo-second-order kinetic models. Adsorption processes were primarily chemical adsorption, accompanied by secondary physical adsorption, and IA-Ca-Al-LDHs exhibited a higher fitting degree. Mechanistically, IA-Ca-Al-LDHs features enhanced surface negative charges and expanded interlayer spacing from the modification, underlying its superior adsorption performance. This study highlights the significant potential of itaconic acid-modified Ca-Al-LDHs synthesized via coprecipitation in the efficient treatment of dye wastewater.