Adsorption characteristics of metal-organic framework MIL-101(Cr) towards sulfamethoxazole and its persulfate oxidation regeneration

作者：Huang, Xiaoli; Hu, Qi; Gao, Lei; Hao, Qirui; Wang, Peng; Qin, Dongli^*

来源：RSC Advances, 2018, 8(49): 27623-27630.

DOI：10.1039/c8ra04789h

• GRANULAR ACTIVATED CARBON
• SIMULTANEOUS REMOVAL
• WATER
• PHARMACEUTICALS
• DEGRADATION
• ADSORBENT
• KINETICS
• SORPTION
• TETRACYCLINE
• ANTIBIOTICS

A metal-organic framework, MIL-101(Cr), was used to adsorb sulfamethoxazole (SMZ) in water and activated persulfate (PS) oxidation was investigated to regenerate SMZ-saturated MIL-101(Cr). Adsorption and oxidation were combined in this study. MIL-101(Cr) was characterized by SEM, BET, XPS and FT-IR analyses. Effects of various operating parameters on adsorption efficiency were studied. The dosages of persulfate for SMZ desorption and oxidation were investigated. The results showed that the recommended pH was 6-8 for SMZ adsorption and optimum MIL-101(Cr) dosage was 0.1 g L-1. SMZ adsorption by MIL-101(Cr) was a spontaneous process and nearly exothermic. Saturation adsorption capacity was achieved in 180 s and the adsorption followed the pseudo-second-order model. The maximum adsorption amount of MIL-101(Cr) to SMZ was 181.82 mg g (1) (Langmuir). MIL-101(Cr) also showed good adsorption capacities for sulfachloropyridazine (SCP), sulfamonomethoxine (SMM), and sulfadimethoxine (SDM). Persulfate was helpful for SMZ desorption from the surface of saturated MIL-101( Cr) and sufficient persulfate could simultaneously oxidize the SMZ. XPS analysis showed that the structure of MIL-101(Cr) was stable after the persulfate oxidation process. Regenerated MIL-101(Cr) had the same level of adsorption capacity as fresh MIL-101(Cr). An adsorption-oxidation combined process may be set up based on the results. This study provides basic data for the deep treatment of organic micropollutants in urban water bodies.

• 出版日期2018
• 单位中国水产科学研究院; 沈阳药科大学