Toxic mercury ions in wastewater from industrial activities can wreak havoc on the natural environment and ecosystems. Adsorption treatment has been proved to be an effective measure to reduce mercury load in wastewater, but conventional adsorbents have lower adsorption performance. In this study, titanium-metal organic framework (Ti-MOF) was synthesized by solvothermal method, and then further modified by 2,5-thiophene dicarboxylic acid. In order to explore the morphology of the resulting material (OB-MIL-125 (Ti)) and the differences before and after modification, different characterization instruments have been employed. Meanwhile, the properties of materials at different pH were explored, and the adsorption capacity was deeply studied through thermodynamics, kinetics, and adsorption isotherms. The surface of OB-MIL-125 (Ti) had a rich pore structure, so the specific surface area is large, reaching 328.7 m²/g. At room temperature and pH= 5, the maximum removal rate of a 100 ppm solution reached 93.66%. The actual measured maximum adsorption capacity was 1435.98 mg/g. According to isotherm, kinetic and thermodynamic analysis, the process of removing Hg²⁺ was a multi-layer heterogeneous process, relying on chemical action for adsorption, and it was also a spontaneous exothermic process. The adsorbent presented excellent affinity for mercury and good regeneration ability. To sum up, the OB-MIL-125 (Ti) has great potential for remediation mercury-containing wastewater.

工业活动废水中的有毒汞离子会对自然环境和生态系统造成严重破坏。吸附处理已被证明是降低废水中汞负荷的有效措施，但常规吸附剂的吸附性能较低。本研究采用溶剂热法合成了钛金属有机骨架材料（Ti-MOF），并用2,5-噻吩二甲酸对其进行了进一步修饰。为了探索所得材料（OB-MIL-125（Ti））的形貌以及改性前后的差异，采用了不同的表征仪器。同时探索了材料在不同pH值下的性能，以及吸附能力通过热力学、动力学和吸附等温线进行了深入研究。OB-MIL-125(Ti)表面具有丰富的孔隙结构，因此比表面积较大，达到328.7 m ²/g。在室温、pH=5下，100 ppm溶液的最大去除率达到93.66%。实测最大吸附容量为1435.98 mg/g。根据等温线、动力学和热力学分析，去除Hg²⁺是一个多层非均相过程，依靠化学作用进行吸附，同时也是一个自发放热过程。该吸附剂具有良好的汞亲和力和良好的再生能力。综上所述，OB-MIL-125（Ti）对于含汞废水的修复具有巨大的潜力。