The extensive and accumulative use of tetracycline (TC) in the environment has become a serious problem. In this study, MIL-88A/g-C₃N₄ micro-nano particles were successfully prepared through a simple, low-cost, one-step hydrothermal method for TC adsorption in water. At a pH of 7.0, the maximum adsorption capacity (154.51 mg·g⁻¹) of MIL-88A/g-C₃N₄ is reached at room temperature. Owing to its porous structure and large pore size (>2.06 nm) of MIL-88A/g-C₃N₄, TC can be adsorbed on both external and internal surfaces. Kinetic and thermodynamic studies have shown that the pseudo-second-order kinetic and the Langmuir-Freundlich model can be used to describe the adsorption process, which is a spontaneous endothermic process. The mechanism study reveals that the TC adsorption process by MIL-88A/g-C₃N₄ is mainly through electrostatic interaction and the ion exchange of COOH and NH₂ groups on MIL-88A/g-C₃N₄ to TC. After simple pickling and water washing, MIL-88A/g-C₃N₄ can still reach 83.1% of the original adsorption capacity after five cycles, which proves that MIL-88A/g-C₃N₄ can be a promising adsorbent.

在环境中广泛和累积使用四环素（TC）已成为一个严重的问题。在这项研究中，MIL-88A / gC ₃ N ₄微纳米粒子是通过一种简单，低成本，一步一步的水热法成功地将TC吸附在水中而制备的。在7.0的pH下，室温下达到MIL-88A / gC ₃ N ₄的最大吸附容量（154.51 mg·g ^-1）。由于其多孔结构和MIL-88A / gC ₃ N _4的大孔径（> 2.06 nm），TC可以同时吸附在内外表面上。动力学和热力学研究表明，伪二级动力学和Langmuir-Freundlich模型可以用来描述吸附过程，这是一个自发的吸热过程。机理研究表明，MIL-88A / gC ₃ N ₄对TC的吸附过程主要是通过静电作用以及MIL-88A / gC ₃ N ₄上COOH和NH ₂基团与TC的离子交换。经过简单的酸洗和水洗后，MIL-88A / gC ₃ N ₄在五个循环后仍可达到原始吸附容量的83.1％，这证明了MIL-88A / gC ₃N ₄是有希望的吸附剂。