Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, 100193, China.
Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, 100193, China.
Chemosphere. 2021 Oct;280:130877. doi: 10.1016/j.chemosphere.2021.130877. Epub 2021 May 15.
A mild and one-pot activation approach of activated carbon was found. The feasibility of boric acid as the activated reagent which was used for the adsorption of four tetracyclines antibiotics (TCs) in water. Boric acid activated carbon (BAC) from bioresource has a much higher removal efficiency than currently reported biochar. The maximum adsorption capacity of BAC is 173.9 mg/g for TCs. BAC is an ecofriendly, nontoxic, and low-cost absorbent from sawdust waste. BAC and TCs could keep coalescing at least 55 days on the surface without stable release. BAC was fully characterized by using scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, Raman, zeta potential, and Brunauer-Emmett-Teller analysis; the large surface area and rich pore structure were proved. The interaction between BAC and TCs are hydrogen bond interaction, π-π interaction, and electrostatic interaction. These interactions are also related to the surface charge of BAC and the TCs' species of ions in different pH. Furthermore, the adsorption kinetics and adsorption isotherm of BAC were studied thoroughly. The pseudo-first-order, pseudo-second-order, intra-particle diffusion, Elovich Langmuir, Freundlich, and Dubinin-Radushkevich models were fitted and the physical adsorption process was proved. After the study on adsorption thermodynamics, adsorption exhibits a spontaneous and favorable process.
一种温和且一锅法的活性炭活化方法被发现。硼酸作为一种活化试剂的可行性，用于水中四种四环素类抗生素（TCs）的吸附。生物资源的硼酸活性炭（BAC）比目前报道的生物炭具有更高的去除效率。BAC 对 TCs 的最大吸附容量为 173.9 mg/g。BAC 是一种环保、无毒、低成本的吸附剂，来源于木屑废料。BAC 和 TCs 在表面上至少可以保持 55 天的凝聚而没有稳定释放。通过扫描电子显微镜、X 射线光电子能谱、X 射线衍射、拉曼、动电位和 Brunauer-Emmett-Teller 分析对 BAC 进行了全面表征；证明了其具有较大的表面积和丰富的孔结构。BAC 和 TCs 之间的相互作用是氢键相互作用、π-π 相互作用和静电相互作用。这些相互作用也与 BAC 的表面电荷和不同 pH 值下 TCs 的离子种类有关。此外，还深入研究了 BAC 的吸附动力学和吸附等温线。拟合了伪一级、伪二级、内扩散、Elovich Langmuir、Freundlich 和 Dubinin-Radushkevich 模型，证明了物理吸附过程。通过对吸附热力学的研究，吸附过程是自发和有利的。
