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<p>Textile industries nowadays are at the helm of pollution-causing units due to the utilization of organic dyestuffs such as methylene blue (MB) and others. This has led to severe criticism of the textile industry, and local governments have adopted strict pollution abatement campaigns in these industries to curb water pollution due to the usage of organic dyes. To facilitate the adsorption of MB and control the dye levels in the effluent, this study utilized rice husk (RH) as a potential adsorbent. The influence of different operating parameters, viz. initial concentration (10–30&#xa0;mg/L), depth of adsorbent bed (25–45&#xa0;cm) and flow rate (10–20&#xa0;mL/min.), was studied using column adsorption. The analysis of the results showed that the maximum adsorption capacity of MB was found to be 3.15&#xa0;mg/g at 20&#xa0;mg/L feed, 35&#xa0;cm bed depth and 10&#xa0;mL/min flow rate. Comprehensive mathematical models, viz. Bohart–Adams, Hutchins and Yoon–Nelson, Wolborska and Michael’s equations, were used to evaluate different column bed design parameters. Along with the surface diffusion model, the Clark model and other models for calculating mass transfer effects were also investigated. Thomas and Wolborska models were investigated to determine the adsorption capacity of RH amounting to 2.0&#xa0;mg/g and 5.625&#xa0;mg/g, respectively, at an optimum flow rate of 10&#xa0;mL/min. The results exhibited that rice husk exhibited a vast potential for the treatment of MB dye and the applied models validated the experiment data with good fit.</p> Graphical abstract <p></p>

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Cationic dye removal via eco-adsorbent: column and modeling study

  • 期刊论文

  • 发表日期：

    2025年5月18日

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  • Mamta Bhagat,
  • Neeraj Dahiya,
  • Vishal Vilvas,
  • Surinder Singh,
  • Suresh Sundaramurthy

摘要

Textile industries nowadays are at the helm of pollution-causing units due to the utilization of organic dyestuffs such as methylene blue (MB) and others. This has led to severe criticism of the textile industry, and local governments have adopted strict pollution abatement campaigns in these industries to curb water pollution due to the usage of organic dyes. To facilitate the adsorption of MB and control the dye levels in the effluent, this study utilized rice husk (RH) as a potential adsorbent. The influence of different operating parameters, viz. initial concentration (10–30 mg/L), depth of adsorbent bed (25–45 cm) and flow rate (10–20 mL/min.), was studied using column adsorption. The analysis of the results showed that the maximum adsorption capacity of MB was found to be 3.15 mg/g at 20 mg/L feed, 35 cm bed depth and 10 mL/min flow rate. Comprehensive mathematical models, viz. Bohart–Adams, Hutchins and Yoon–Nelson, Wolborska and Michael’s equations, were used to evaluate different column bed design parameters. Along with the surface diffusion model, the Clark model and other models for calculating mass transfer effects were also investigated. Thomas and Wolborska models were investigated to determine the adsorption capacity of RH amounting to 2.0 mg/g and 5.625 mg/g, respectively, at an optimum flow rate of 10 mL/min. The results exhibited that rice husk exhibited a vast potential for the treatment of MB dye and the applied models validated the experiment data with good fit.

Graphical abstract