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Adsorption of phenol on kenaf‐derived biochar: studies on physicochemical and adsorption characteristics and mechanism
Biomass Conversion and Biorefinery ( IF 4 ) Pub Date : 2022-09-05 , DOI: 10.1007/s13399-022-03262-x
Eun-Ji Cho, Chang-Gu Lee, Jin-Kyu-Kang, Seong-Jik Park

Biochar derived from kenaf, a fast-growing plant, was used as a adsorbent in this study to remove phenol from aqueous solutions. Kenaf-derived biochar (KDB) was prepared at various temperatures (300–750 °C) and the relationship between the phenol adsorption mechanism and physicochemical properties was investigated. The highest phenol adsorption by KDB was achieved at 750 °C, and KDB pyrolyzed at 750 °C (KDB-750) had the lowest O/C (0.11) and H/C (0.01) values as well as the highest specific surface area (116.74 m2/g). Phenol molecules could be adsorbed on the surface of KDB via hydrophobic attraction and π–π interaction. Kinetic studies revealed that the adsorption reached equilibrium at 48 h, and the adsorption process was well explained by the pseudo-second-order model. The maximum phenol adsorbed obtained from equilibrium adsorption experiments was 41.1 mg/g, which is comparable to that reported in the literature. The enthalpy and entropy changes during phenol adsorption by KDB-750 were 22.3 kJ/mol and 64.2 J/K‧mol, respectively. The amount of phenol adsorbed decreased gradually from 38.5 to 32.4 mg/g as the pH of the solution increased from 3 to 9, and it decreased sharply from 32.4 to 28.9 mg/g as the pH increased from 9 to 11. When 0 to 200 mM NaCl was added to the phenol solution, the adsorbed amount decreased from 38.1 to 29.5 mg/g. Moreover, for a KDB-750 dosage of 10 g/L, > 90% of the phenol was removed. Thus, KDB-750, which is a low-cost and abundant adsorbent, could potentially be used as an adsorbent to remove phenol effectively.



中文翻译:

红麻衍生生物炭对苯酚的吸附:物理化学和吸附特性及机理研究

在本研究中,从快速生长的植物洋麻中提取的生物炭被用作吸附剂,以去除水溶液中的苯酚。在不同温度(300-750°C)下制备红麻衍生的生物炭(KDB),并研究了苯酚吸附机制与物理化学性质之间的关系。KDB 对苯酚的最高吸附是在 750 °C 时实现的,而在 750 °C 下热解的 KDB (KDB-750) 具有最低的 O/C (0.11) 和 H/C (0.01) 值以及最高的比表面积(116.74 米2/G)。苯酚分子可以通过疏水吸引力和π-π相互作用吸附在KDB表面。动力学研究表明,吸附在 48 h 时达到平衡,吸附过程可以用准二级模型很好地解释。从平衡吸附实验中获得的最大苯酚吸附量为 41.1 mg/g,与文献报道的相当。KDB-750吸附苯酚时的焓变和熵变分别为22.3 kJ/mol和64.2 J/K‧mol。随着溶液的 pH 值从 3 增加到 9,苯酚的吸附量从 38.5 逐渐下降到 32.4 mg/g,随着 pH 值从 9 增加到 11,苯酚的吸附量从 32.4 急剧下降到 28.9 mg/g。当 0 到 200将 mM NaCl 添加到苯酚溶液中,吸附量从 38.1 降至 29.5 mg/g。而且,对于 10 g/L 的 KDB-750 剂量,去除了 > 90% 的苯酚。因此,KDB-750 是一种低成本且含量丰富的吸附剂,可用作有效去除苯酚的吸附剂。

更新日期:2022-09-06
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