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Ibuprofen contamination from water sources has been increasingly alarming due to its environmentally accumulative retention; however, the strategies for ibuprofen-containing water treatment are still an enormous challenge. Herein, we described the utilization of metal-organic frameworks MIL-53(Fe) (MIL = Materials of Institute Lavoisier) for the adsorption of ibuprofen in synthetic solution. Firstly, the MIL-53(Fe) was solvothemally synthesized and then characterized using the X-ray diffraction and Fourier-transform infrared spectroscopy techniques. The optimization of ibuprofen adsorption over MIL-53(Fe) was performed with three independent variables including ibuprofen concentration (1.6–18.4 mg/L), adsorbent dosage (0.16–1.84 g/L), and pH (2.6–9.4) according to the experimental design from response surface methodology. Under the optimized conditions, more than 80% of ibuprofen could be eliminated from water, indicating the promising potential of the MIL-53(Fe) material for treatment of this drug. Kinetic and isotherm models also were used to elucidate the chemisorption and monolayer behavior mechanisms of ibuprofen over MIL-53(Fe).

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Hybrid nanocomposites of poly(2-hydroxyethyl methacrylate) (PHEMA) and TiO 2 nanoparticles were synthesized via surface thiol-lactam initiated radical polymerization by following the grafting from strategy. Initially, TiO 2 nanoparticles were modified by 3-mercaptopropyl trimethoxysilane to prepare thiol functionalized TiO 2 nanoparticles (TiO 2 ASH). Subsequently, surface initiated polymerization of 2-hydroxyethyl methacrylate was conducted by using TiO 2 ASH and butyrolactam as an initiating system. The anchoring of PHEMA onto the surface of TiO 2 nanoparticles was investigated by FTIR, 1 H-NMR, XPS, TGA, and XRD analyses. The experimental results indicated a strong interaction between PHEMA and TiO 2 nanoparticles owing to covalent bonding. The TEM and SEM images of PHEMA-g-TiO 2 showed that the agglomeration propensity of TiO 2 nanoparticles was significantly reduced upon the PHEMA functionalization. The molecular weight and polydispersity index of the cleaved PHEMA from the surface of TiO 2 nanocomposites were estimated by GPC analysis. An improved thermal property of the nanocomposites was observed from TGA analysis. PHEMA-g-TiO 2 nanocomposites were found to be highly dispersible in organic solvents.