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<p>Significant use of dyes in different industries leads to the generation of wastewater and consequently environmental degradation. This study aimed to investigate the dye “Acid blue 93” (AB93) adsorption potential of various co-pyrolyzed biochars such as walnut shells + lemon peels biochar (WLB), pea peels + lemon peels biochar (LPB), walnut shells + pea peels biochar (WPB) and walnut shells + pea peels + lemon peels biochar (WPLB) in batch sorption experiment under various experimental conditions. The results of this study demonstrated that WPLB among other biochars showed maximum removal (99%) at pH 7 followed by LPB (98%), WPB (94%) and WLB (89%). The maximum sorption of all biochars were observed at 1.5&#xa0;g L<sup>−1</sup> sorbent dose and 35&#xa0;mg L<sup>−1</sup> dye concentration while WPLB showed the maximum sorption after 2&#xa0;h contact time. The sorption data for AB93 were best suited by pseudo-second order and the Langmuir isotherm models. Functional groups that were involved in sorption were found to be hydroxyl (—OH), methyl (—C—H) and carbonyl group. In three cycles of regeneration or sorption/desorption, AB93 desorbed from the biochars up to 95%. In short, WPLB showed the maximum efficiency of removal for dye AB93 from aqueous solution. Hence WPLB could prove to be the cost-effective and sustainable sorbent to effectively eradicate different dyes like AB93 from contaminated water.</p>

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High Adsorption Potential of Co-Pyrolyzed Biochars for Acid Blue 93 in Wastewater

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Dania Majeed,
  • Muhammad Bilal Shakoor,
  • Muhammad Awais,
  • Naeem Akhtar Abbasi

摘要

Significant use of dyes in different industries leads to the generation of wastewater and consequently environmental degradation. This study aimed to investigate the dye “Acid blue 93” (AB93) adsorption potential of various co-pyrolyzed biochars such as walnut shells + lemon peels biochar (WLB), pea peels + lemon peels biochar (LPB), walnut shells + pea peels biochar (WPB) and walnut shells + pea peels + lemon peels biochar (WPLB) in batch sorption experiment under various experimental conditions. The results of this study demonstrated that WPLB among other biochars showed maximum removal (99%) at pH 7 followed by LPB (98%), WPB (94%) and WLB (89%). The maximum sorption of all biochars were observed at 1.5 g L−1 sorbent dose and 35 mg L−1 dye concentration while WPLB showed the maximum sorption after 2 h contact time. The sorption data for AB93 were best suited by pseudo-second order and the Langmuir isotherm models. Functional groups that were involved in sorption were found to be hydroxyl (—OH), methyl (—C—H) and carbonyl group. In three cycles of regeneration or sorption/desorption, AB93 desorbed from the biochars up to 95%. In short, WPLB showed the maximum efficiency of removal for dye AB93 from aqueous solution. Hence WPLB could prove to be the cost-effective and sustainable sorbent to effectively eradicate different dyes like AB93 from contaminated water.