Department of Civil and Environmental Engineering, University of Ulsan, Daehak-ro 93, Nam-gu, Ulsan, 680-749, Republic of Korea.
Research Center for Chemistry, National Research and Innovation Agency, PUSPIPTEK Area, Serpong, 15314, Indonesia.
Environ Sci Pollut Res Int. 2022 Sep;29(41):62382-62392. doi: 10.1007/s11356-022-19866-9. Epub 2022 Apr 9.
Low-cost adsorbent, pine bark biochar (PBB) from the forest residue, was produced and applied to remove tetracycline (TC) from aqueous solution via adsorption pathway. The PBB, hence obtained, was modified using aqueous ferric and ferrous ion solutions to obtain magnetic pine bark biochar (M-PBB). Batch adsorption experiments were conducted to examine the adsorption of TC by PBB and M-PBB in the variation of pH, contact time, dosage, and temperature. The adsorbents were characterized by SEM/EDX, TGA, and pH. The adsorption mechanism was evaluated by fitting Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R) isotherms model. Also, the experimental data were analyzed by kinetics models (pseudo-first-order, pseudo-second-order, intra-particle diffusion, and Elovich) and thermodynamics. The maximum adsorption capacity (q) of M-PBB was 15.3 mg/g from the experiment at pH 6. A high correlation coefficient (R ≈ 0.9) of Freundlich isotherm postulated multi-layer adsorption of TC on M-PBB at pH 6. The kinetic studies showed that the pseudo-first-order was more suitable for representing the adsorption of TC molecules on the surface. The thermodynamic analysis was showed that the adsorption process is favorable, spontaneous, and endothermic at studied temperatures. M-PBB demonstrated a potential for removal of TC from water as a low-cost and convenient adsorbent.
低成本吸附剂——来自森林残留物的松树皮生物炭（PBB），通过吸附途径被制备并应用于从水溶液中去除四环素（TC）。所得的 PBB 用铁离子和亚铁离子的水溶液进行改性，得到磁性松树皮生物炭（M-PBB）。通过改变 pH 值、接触时间、剂量和温度，进行了批量吸附实验，以研究 PBB 和 M-PBB 对 TC 的吸附作用。通过 SEM/EDX、TGA 和 pH 对吸附剂进行了表征。通过拟合 Langmuir、Freundlich、Temkin 和 Dubinin-Radushkevich（D-R）等温线模型评估了吸附机理。此外，通过动力学模型（伪一级、伪二级、内扩散和 Elovich）和热力学对实验数据进行了分析。在 pH 值为 6 的实验中，M-PBB 的最大吸附容量（q）为 15.3 mg/g。Freundlich 等温线的高相关系数（R ≈ 0.9）表明，在 pH 值为 6 时，TC 多分子层吸附在 M-PBB 上。动力学研究表明，伪一级更适合表示 TC 分子在表面的吸附。热力学分析表明，吸附过程在研究温度下是有利的、自发的和吸热的。M-PBB 作为一种低成本、方便的吸附剂，具有从水中去除 TC 的潜力。
