College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China.
Department of Chemistry, Capital Normal University, Beijing 100048, China.
Bioresour Technol. 2020 Sep;311:123455. doi: 10.1016/j.biortech.2020.123455. Epub 2020 Apr 28.
Rice straw derived biochar shows low-cost superiority as a potential adsorbent in tetracycline (TC) removal, but limited by its poor adsorption capacity and N, P leaking risk. Herein, an alkali-acid combined and magnetization method was proposed for its modification. The sorption kinetic and isotherm data showed modification enhanced the performance for tetracycline removal with adsorption capacity up to 98.33 mg·g. The strong adsorption mechanisms were dominated by hydrogen bonding and pore-filling effect due to the increase of specific surface area and pore volume. Furthermore, the effect of pH was insignificant over a pH range from 3 to 10. The strong competition between ionic and TC was identified, where Ca and PO markedly inhibited the sorption. The enhanced TC adsorption, strong N and P removal, easy magnetic recovery, and good reusability in water samples entrusted it with good potential for wastewater treatment and rice straw resource disposal.
稻草衍生生物炭作为一种潜在的吸附剂，在去除四环素（TC）方面表现出低成本的优势，但由于其吸附容量有限，存在氮、磷泄漏的风险。为此，本研究提出了一种酸碱联合磁化的方法对其进行改性。吸附动力学和等温线数据表明，改性后生物炭对四环素的去除性能得到了增强，吸附容量高达 98.33mg·g。由于比表面积和孔体积的增加，主要通过氢键和孔填充效应来增强吸附性能。此外，在 pH 值为 3 到 10 的范围内，pH 值的影响可以忽略不计。研究还确定了离子和 TC 之间的强烈竞争，其中 Ca 和 PO 显著抑制了吸附。该生物炭在水样中具有增强的 TC 吸附能力、良好的氮磷去除能力、易于磁回收以及良好的可重复使用性，这使其在废水处理和稻草资源处理方面具有良好的应用潜力。
