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<p>Agro-waste biomass of&#xa0;<i>Cajanus cajan</i>&#xa0;leaves were used for the synthesis of bioadsorbent iron activated pigeon pea leave (Fe-ACP) at 500&#xa0;°C in muffle furnace and used for the abatement of fluoride from water. Characterization of&#xa0;bioadsorbent was done by using pH<sub>PZC</sub>, Scanning Electron Microscopy, Energy-dispersive X-ray, X-Ray Diffraction, and Fourier Transform Infrared Spectroscopy. Study was also conducted by varying the adsorbent doses, initial concentrations of fluoride, contact time intervals, pH of solution, temperature of the solution and in presence different competing ions.&#xa0;The result clearly indicated that at optimum adsorbent dose of 3&#xa0;g/L the maximum removal of fluoride was achieved within 150&#xa0;min of contact time. The fluoride removal efficiency got increased with increase in temperature from 25&#xa0;°C to 55&#xa0;°C. The Langmuir isotherm (R<sup>2&#xa0;</sup>= 0.997) and pseudo-second-order kinetic model (R<sup>2&#xa0;</sup>= 0.991) were found to be the best fit model to explain the mechanism of fluoride adsorption on Fe-ACP. The adsorption process was observed to be endothermic and spontaneous in nature as evidenced by thermodynamics studies. Through ANOVA analysis, the significant influence (p &lt; 0.001) of contact time, biochar dose, initial fluoride concentrations, pH, and temperature were observed on the fluoride adsorption process. Presence of similar charge of competing ions (nitrate and phosphate) significantly impacted on the efficiency of Fe-ACP bioadsorbent for fluoride adsorption. Regeneration studies showed that Fe-ACP bio-adsorbent can be utilized up to four cycles. The experimental results proved that the Fe-ACP bio-adsorbent has excellent ability to reduce the level of fluoride from water up to 4 cycles after regeneration.</p>

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Iron Infused Cajanus Cajan Leaf-Based Novel Bioadsorbent for Fluoride Adsorption from Water: Isotherm, Kinetic and Mechanisms

  • 期刊论文

  • 发表日期：

    2025年1月28日

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  • Naveen Patel,
  • Santanu Mallik,
  • Saurabh Kumar,
  • Brijesh Kumar Yadav,
  • Akansha Patel,
  • Vinod Kumar Chaudhary,
  • Arun Lal Srivastav

摘要

Agro-waste biomass of Cajanus cajan leaves were used for the synthesis of bioadsorbent iron activated pigeon pea leave (Fe-ACP) at 500 °C in muffle furnace and used for the abatement of fluoride from water. Characterization of bioadsorbent was done by using pHPZC, Scanning Electron Microscopy, Energy-dispersive X-ray, X-Ray Diffraction, and Fourier Transform Infrared Spectroscopy. Study was also conducted by varying the adsorbent doses, initial concentrations of fluoride, contact time intervals, pH of solution, temperature of the solution and in presence different competing ions. The result clearly indicated that at optimum adsorbent dose of 3 g/L the maximum removal of fluoride was achieved within 150 min of contact time. The fluoride removal efficiency got increased with increase in temperature from 25 °C to 55 °C. The Langmuir isotherm (R2 = 0.997) and pseudo-second-order kinetic model (R2 = 0.991) were found to be the best fit model to explain the mechanism of fluoride adsorption on Fe-ACP. The adsorption process was observed to be endothermic and spontaneous in nature as evidenced by thermodynamics studies. Through ANOVA analysis, the significant influence (p < 0.001) of contact time, biochar dose, initial fluoride concentrations, pH, and temperature were observed on the fluoride adsorption process. Presence of similar charge of competing ions (nitrate and phosphate) significantly impacted on the efficiency of Fe-ACP bioadsorbent for fluoride adsorption. Regeneration studies showed that Fe-ACP bio-adsorbent can be utilized up to four cycles. The experimental results proved that the Fe-ACP bio-adsorbent has excellent ability to reduce the level of fluoride from water up to 4 cycles after regeneration.