Hunan International Scientific and Technological Cooperation Base of Agricultural Typical Pollution Remediation and Wetland Protection, College of the Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.
Department of Soil Science and Agricultural Chemistry, Univ. Santiago de Compostela, Engineering Polytechnic School, Campus Univ. S/n, 27002 Lugo, Spain.
Waste Manag. 2023 Aug 1;168:386-395. doi: 10.1016/j.wasman.2023.06.014. Epub 2023 Jun 20.
The treatment of combined antibiotics and heavy metals pollution is a critical challenge. Herein, iron and nitrogen co-doped biochar (Fe/N-BC) was synthesized using rape straw as precursor, and applied for the adsorption of ciprofloxacin (CIP) and Cu in single and binary systems. The q for CIP and Cu were 46.45 mg g and 30.77 mg g, respectively. Adsorption decreased in a binary matrix, indicating that there was a competitive effect between CIP and Cu, which might be due to CIP and Cu sharing similar active adsorption sites on Fe/N-BC. Interestingly, CIP and Cu co-adsorption was a pH-dependent process. Fe/N-BC has potential to highly selectively separate CIP/Cu from mixed solutions through adjusting pH values. Furthermore, adsorption mechanisms were systematically investigated in this research. This research could help to provide a deeper understanding of the synchronously removing specific antibiotics and heavy metals by biochar adsorbents.
抗生素和重金属污染的联合处理是一个关键的挑战。在此，采用油菜秸秆为前驱体合成了铁氮共掺杂生物炭（Fe/N-BC），并将其用于单组分和双组分体系中吸附环丙沙星（CIP）和 Cu。CIP 和 Cu 的吸附量分别为 46.45 mg g 和 30.77 mg g。在双组分基质中，吸附量降低，表明 CIP 和 Cu 之间存在竞争作用，这可能是由于 CIP 和 Cu 在 Fe/N-BC 上共享相似的活性吸附位。有趣的是，CIP 和 Cu 的共吸附是一个依赖于 pH 值的过程。通过调节 pH 值，Fe/N-BC 有可能从混合溶液中高度选择性地分离 CIP/Cu。此外，本研究还系统地研究了吸附机制。这项研究有助于深入了解生物炭吸附剂同步去除特定抗生素和重金属的机制。
