Fabrication of PEBA/HZIF-8 Pervaporation Membranes for High Efficiency Phenol Recovery

Abstract

Phenol and its chemical derivatives serve as essential chemical materials are indispensable for the synthesis of many kinds of polymers. However, they are highly toxic, carcinogenic, difficult to be degraded biologically, and often found in aqueous effluents. Recovery of hazardous phenol from wastewater remains a daunting challenge. Herein, we prepared a hybrid membrane containing polyether block amide (PEBA) matrix and HZIF-8 fillers. To improve the compatibility between ZIF-8 and PEBA, ZIF-8 was modified by using polystyrene (PS) as a template to prepare porous HZIF-8. ZIF-8, composed of zinc nodes linked by the imidazole ring skeleton, is a kind of inorganic material with high hydrothermal stability, ordered pores, and hydrophobic microporous surfaces, which has a wide range of applications in membrane separation. The separation performance of the PEBA/HZIF-8 based membranes for phenol/water is improved due to the presence of PS on the surface of HZIF-8 and the imidazole ring skeleton in ZIF-8, which enhance the π–π interaction between HZIF-8 and phenol molecules. The effects of HZIF-8 content, feed phenol concentration, and feed temperature on the pervaporation performance of PEBA/HZIF-8 membranes were further investigated. The results showed that the pervaporation performance of the PEBA/HZIF-8-10 membrane was promising with a separation factor of 80.89 and permeate flux of 247.70 g/m 2 ·h under the feed phenol concentration of 0.2 wt % at 80 °C. In addition, the PEBA/HZIF-8-10 membrane presented excellent stability, which has great prospect for practical application in phenol recovery from waste water.

Controlling the magnitude and polarity of surface charges in PEBA polymers by adding UIO-66 MOFs

“…1), as was also observed in the case of PEBA/ZIF-8 mixed matrix membranes. 15 The spectra of the composites with the highest 5 wt% amounts of MOF inclusions show the appearance of an absorption band at 3670 cm À1 , corresponding to the n(OH) vibrations of UIO-66 and UIO-66-NH 2 MOFs. 16,17 The absorption increasing with MOF concentration was observed at 1506 cm À1 in PEBA/UIO-66 and at 765 cm À1 (N-H vibrations) in PEBA/UIO-66-NH 2 composites (ESI † Fig.…”

Holmium-Containing Metal-Organic Frameworks as Modifiers for PEBA-Based Membranes

“…These polymers have a number of properties, such as flexibility, chemical resistance and strength, that make them promising for use in membrane technologies [ 54 , 55 , 56 ]. Recently, a number of studies have been carried out on the use of mixed matrix membranes based on PEBA not only for the separation of gases [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ] but also for the extraction of various biofuel components [ 67 , 68 ], alcohols [ 69 , 70 ], desulphurization [ 71 ], alcohol dehydration [ 72 ], esterification [ 73 ] and pervaporation [ 74 , 75 ]. The high degree of combinatoriality in the preparation of block copolymers makes it possible to obtain a large number of commercially available polymers with different compositions and properties [ 76 ].…”