alieh moeinipour

In the present study, HKUST-1 (Hong Kong University of Science and Technology), HKUST-1@PVA, and Fe3O4@HKUST-1, metal-organic framework, were synthesized by hydrothermal, post-synthetic modification and pre-synthetic modification methods, respectively. These sorbents were applied to remove the meloxicam drug as the model drug from aqueous solutions. The adsorption isotherm, kinetic, and thermodynamic experiments were done and confirmed that the adsorption behaviors of HKUST-1, Fe3O4@HKUST-1, and HKUST-1@PVA are based on Langmuir isotherm (the values of qmax were obtained as 883.33, 2.50E+03 mg/g for HKUST-1@PVA and Fe3O4@HKUST-1, respectively) and Freundlich isotherm (the values of KF were obtained as 3.02E+03 (n=0.74), 7.24E+03 (n=0.99) and 7.99E+04 (n=1.49) for HKUST-1, Fe3O4@HKUST-1 and HKUST-1@PVA, respectively), with an endothermic mechanism and enthalpy-driven process. The kinetic results showed well-fitting with the pseudo-second-order kinetic model for all of them. The speed of the adsorption process, low cost, high efficiency, and high surface area are the main advantages of the proposed compounds as sorbents. The functionalization of HKUST-1 with magnetic nanoparticles decreased the adsorption time, and with PVA provides more functional group on the surface of HKUST-1 and increases its adsorption efficiency. Further, an easy separation with an external magnet in 30 seconds is another advantage of magnetic functionalization. The aforementioned features make these adsorbents appropriate candidates for cost-effective water treatment.

In the present study, HKUST-1 magnetic nanocomposite was prepared using the hydrothermal method and pre-synthesis modification. The aforementioned magnetic nanocomposite was characterized by the FT-IR, SEM, XRD and VSM techniques. In addition, the ability of this metal-organic framework to remove of the non-steroidal anti-inflammatory drug, Meloxicam, from aqueous solutions was studied. The widespread application of Meloxicam and the inefficient treatment of wastewater have resulted in the detect of the drug in water resources which can affect human health and/or ecosystems negatively. Therefore, the removal process of meloxicam was investigated by Fe3O4@HKUST-1 as the sorbent. Thus, the effect of variables factors on the removal process such as pH (7), absorbent weight (0.7 mg) and absorbent and absorbed proximity time (3 min) were optimized by the Central Composite Design at Design Expert software (10.0.7 version), the optimal conditions with desired function were obtained by the response surface methodology. Investigating the absorption isotherm confirms the adsorption behavior based on Freundlich and Langmuir isotherm. The most important advantages of the proposed nanocomposite as the absorbent include fast absorption process, low costs, high efficiency due to the large surface area and the porous structure of the Metal-organic framework. The resulted data showed the high removal efficiency (93.14%) and adsorption capacity (125.11mg g -1 ) of the proposed sorbent.

Water quality protecting in Swimming pools is important for the health of swimmers. Chlorine and its derivatives, which are added to the water as a disinfectant, interact with uric acid from the sweat and urine in water. This procedure produces toxic compounds in the water that endanger the health of the swimmer, even in small amounts. Based on this, introducing a method for removing and separation of this compound from water and treatment of pool water is more important. In this work, adsorption method using metal-organic framework MIL-100 (Fe) as sorbent was applied as for the removal of uric acid from water solutions. This adsorbent can remove uric acid (mg L-1) under ultrasonic waves, the amount of 3 mg of MIL-100(Fe) in initial pH=10 of analyte solution, recovery of removal is 60% of uric acid from water in 30 min. This method is a good and efficient strategy for removing of uric acid due to using a porous metal organic framework material as sorbent.