Abstract A novel biodegradable adsorbent called pyrolysed empty fruit bunch fibres (PEF) was prepared by chemo-physical activation of empty fruit bunch fibres (EFB) biochar for removal of cibacron blue 3G-A (CB) dye from aqueous solution. PEF was characterized using FTIR, SEM-EDX, XRD and BET techniques. The N2 adsorption-desorption isotherms indicated PEF’s surface area to be 362.84 m2g−1 and XRD attributed amorphous nature to PEF. After adsorption process, PEF has smoother surface morphology, increase in carbon by weight and shift in functional groups. The established adsorption optimum conditions were pH 10, 45 min contact time and 0.10 g/100 mL adsorbent dosage with 99.05% CB dye removal capacity at 343 K and initial dye concentration 100 mg/L. Desorption ratio >90% after seventh cycle of adsorption-desorption experiments confirmed high reusability (regeneration) of PEF. Pseudo second order kinetic and Freundlich were better fitted with kinetic and isotherm model respectively, while mechanism of adsorption was controlled by film diffusion (external mass transfer). Thermodynamic studied revealed ΔG, ΔS and ΔH to be −3.12 MJ/mol K, 9.11 kJ/mol K, 6.83 kJ/mol respectively at 343 K. The negative value of ΔG, positive values of ΔS and ΔH indicated spontaneity, feasibility and endothermic nature of CB dye adsorption from aqueous solution onto PEF.

中文翻译：

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使用化学物理活化的生物炭从油棕空果串纤维中去除水溶液中的 cibacron blue 3G-A (CB) 染料

摘要 通过对空果串纤维 (EFB) 生物炭进行化学物理活化以去除水溶液中的 cibacron blue 3G-A (CB) 染料，制备了一种称为热解空果串纤维 (PEF) 的新型可生物降解吸附剂。使用 FTIR、SEM-EDX、XRD 和 BET 技术对 PEF 进行表征。N2 吸附-解吸等温线表明 PEF 的表面积为 362.84 m2g-1，XRD 将无定形性质归因于 PEF。吸附过程后，PEF 具有更光滑的表面形态，碳重量增加和官能团转移。已建立的最佳吸附条件是 pH 10、45 分钟接触时间和 0.10 g/100 mL 吸附剂剂量，343 K 下 99.05% CB 染料去除能力和初始染料浓度 100 mg/L。解吸率 > 吸附-解吸实验的第七个循环后 90% 证实了 PEF 的高可重用性（再生）。伪二级动力学和 Freundlich 分别更适合动力学和等温线模型，而吸附机制由膜扩散（外部传质）控制。热力学研究表明 ΔG、ΔS 和 ΔH 在 343 K 时分别为 -3.12 MJ/mol K、9.11 kJ/mol K、6.83 kJ/mol。 ΔG 的负值、ΔS 和 ΔH 的正值表明自发性、可行性和吸热性CB 染料从水溶液吸附到 PEF 上的性质。