Xunke Zhao,Kaihuan Nie,Fuyi Sun,Cheng Xie,Yanran Cheng,Yuanyuan Che
Nanofiltration holds promise for treating dyeing and printing wastewater on account of its key merits: low consumption, easy manipulation, and absence of secondary contamination. In this study, the fabrication of a uniform permselective ZIF-8@GO composite membrane in the alumina ceramic tube by the continuous flow combined with in situ self-assembly way was investigated. Subsequently, the properties of ZIF-8@GO membrane were examined in relation to reaction time, reaction temperature, flow rate, and GO concentration. Furthermore, the durability of the membrane was tested. It was observed that under optimal conditions, the rejection rate and permeation flux of methyl blue solutions remained essentially constant during 24 hours of continuous operation, with values of 98.39% and 38.27 L/(m 2 ·h·bar), respectively. This work aims to simplify and smoothly implement the industrialized production of MOF-based composite membranes and offers a potential solution for the low-cost and efficient treatment of organic dye wastewater in the printing and dyeing industry.
Ning Wei,Xudong Zheng,Hongxiang Ou,Peilin Yu,Qiao Li,Shanshan Feng
Metal–organic framework (MOF) materials are a class of hybrid organic–inorganic supramolecular materials. Owing to their highest specific surface area, lowest crystal density and adjustable pore size and functional structure, MOF materials have the potential for some special applications in the field of adsorption of heavy metal contaminants. However, it is difficult to collect and reuse them in adsorption separation because of their nanometer size. Therefore, graphene oxide (GO) with good film-forming properties is used. In this paper, an f-ZIF-8@GO composite membrane material was developed by using GO and a zeolitic imidazolate framework (ZIF-8) material and was modified with 3-aminopropyl-triethoxysilane (APTES) by amine functionalization. After a series of structural characterizations, it was applied to the adsorption of copper ions in water and its adsorption properties were tested. The results showed that the adsorption capacity at pH = 6.0 was the largest, and an increase in temperature was not conducive to the adsorption reaction. The adsorption data were fitted to the Freundlich equation and the quasi-second order kinetic equation. The adsorption of Cu2+ on water was multilayer, and the equilibrium adsorption capacity was up to 1872.24 mg g−1. The prepared materials exhibited high selectivity to copper ions; they could be reused as adsorbents for many times and maintained high adsorption capacity. This kind of material is of great significance for the adsorption and separation of heavy metal ions in water.
危险品化学品经营许可证（带存储）