Department of Biological Engineering, College of Engineering, Konkuk University, Seoul, 05029, Republic of Korea.
Department of Pharmacy, College of Pharmacy, Jeju National University, Jeju, 63243, Republic of Korea.
Chemosphere. 2022 Jun;296:134034. doi: 10.1016/j.chemosphere.2022.134034. Epub 2022 Feb 17.
The existing study deals with adsorptive removal of the endocrine-disrupting chemical bisphenol-A and toxic azo dye solvent black-3 from single and binary solutions. These two chemicals are commonly used as an additive in the synthetic plastic industries. Among the tested twenty pristine and modified biochars, the pristine pinecone biochar produced at 750 °C revealed greater bisphenol-A removal. Simulation of the experimental data obtained for bisphenol-A and dye removal from the single-component solution offered a best-fit to Elovich (R > 0.98) and pseudo-second-order (R > 0.99) kinetic models, respectively. Whereas for the bisphenol-A + dye removal from binary solution, the values for bisphenol-A adsorption were best suited to Elovich (R > 0.98), while pseudo-second-order (R > 0.99) for dye removal. Similarly, the two-compartment model also demonstrated better values (R > 0.92) for bisphenol-A and dye removal from single and binary solutions with greater F values (except for bisphenol-A in binary solution). The Langmuir isotherm model demonstrated the highest regression coefficient values (R > 0.99) for bisphenol-A and dye removal with the highest adsorption capacity of 38.387 mg g and 346.856 mg g, correspondingly. Besides, the co-existence of humic acid revealed a positive impact on bisphenol-A removal, while the dye removal rate was slightly hindered in presence of humic acid. The absorption process showed monolayer coverage of biochar surface with contaminants using a chemisorption mechanism with fast reactions between functional groups on the adsorbate and adsorbent. Whereas the adsorption mechanism was primarily controlled by hydrogen bonding, hydrophobic and π-π electron-donor-acceptor interactions as confirmed by FTIR, XPS, and pH investigations.
本研究涉及到从单组分和双组分溶液中去除内分泌干扰化学物质双酚 A 和有毒偶氮染料溶剂黑 3 的吸附去除。这两种化学物质通常用作合成塑料工业中的添加剂。在所测试的二十种原始和改性生物炭中，在 750°C 下制备的原始松果生物炭对双酚 A 的去除效果更好。对单一组分溶液中双酚 A 和染料去除实验数据的模拟，分别拟合到 Elovich（R>0.98）和伪二阶（R>0.99）动力学模型。而对于双酚 A+染料从二元溶液中的去除，双酚 A 吸附的拟合值更适合 Elovich 模型（R>0.98），而染料的拟合值更适合伪二阶模型（R>0.99）。同样，双室模型也为单组分和双组分溶液中双酚 A 和染料的去除提供了更好的值（R>0.92），且 F 值更高（双酚 A 除外）。Langmuir 等温线模型对双酚 A 和染料的去除表现出最高的回归系数值（R>0.99），相应的最大吸附容量分别为 38.387mg/g 和 346.856mg/g。此外，腐殖酸的共存对双酚 A 的去除有积极影响，而在腐殖酸存在下，染料的去除率略有下降。吸附过程显示，生物炭表面的污染物单层覆盖，吸附质和吸附剂之间的官能团发生快速反应，采用化学吸附机制。而吸附机制主要受氢键、疏水和π-π 电子供体-受体相互作用控制，这一点通过 FTIR、XPS 和 pH 值研究得到了证实。
