Magnetic coordination polymer for dye removal and antibacterial activity

Abstract

BackgroundColor elimination from dye wastewater is one of the major environmental concerns, therefore, finding an eco-friendly, recyclable, and effective sorbent for dye treatment is very important. This work aims to scrutinize the performance of a new magnetic amino-coordinated metal–organic framework, namely NiFe2O4/[Zn4(BTC)2(Hbtc)(L-His)2(H2O)4] 1.5H2O (NF/LHTZn), in Acid Red 14 (AR14) and methylene blue (MB) elimination, and antibacterial activity. MethodHere, NiFe2O4 (NF), LHTZn, and NF/LHTZn materials were successfully constructed via the hydrothermal condition and checked via several characterizations (i.e., X-ray diffraction and Fourier transform infrared). Batch adsorption studies were performed to appraise the influence of operational factors like solution preliminary concentration (A), adsorbent dosage (B), contact time (C), temperature (D), and pH on the removal of MB and AR14 dyes. The response surface methodology (RSM) has helped to optimize two dye sorption processes. Significant findingsBased on experimental results, sorption kinetics were correctly matched by the pseudo 2nd order model for both dyes. Freundlich's isotherm indicated that the best fit for MB removal and maximal uptake capacity (Qmax) was 375.93 mg/g, while Langmuir was best fitted for AR14 (Qmax= 276.24). Thermodynamic results revealed that both dye adsorption was spontaneous in nature. According to RSM data, the maximum removal of MB was 292.61 mg/g under optimal conditions, A= 100 mg/L, B= 0.3 g/L, C= 140 min, D= 30 °C and, pH 7, and a maximum AR14 adsorption of 272.35 mg/g gained at an A= 100 mg/L, B= 0.3 g/L, C= 126 min, D= 40 °C and pH 2. Based on disk diffusion results, NF/LHTZn has also a proper antibacterial performance toward Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria.