Green Preparation of a Carboxymethyl Cellulose-Coated Membrane for Highly Efficient Separation of Crude Oil-In-Water Emulsions

Abstract

Developing high-performance membranes is an extremely significant strategy to combat increasing severe oil pollution. However, most of the previously reported superwettable membranes have been inevitably involved with the use of toxic solvents and complicated preparation processes. In addition, most of them lacked the capacity of separating crude oil-in-water emulsions. Herein, a facile and green strategy is employed to fabricate a polytetrafluoroethylene (PTFE) membrane with a mixed suspension of PDA@ZIF-8 and carboxymethyl cellulose (CMC) using water as a solvent via the vacuum filtration method.

Self-Assembled CMC/UiO-66-NH2 Membrane with Anti-Crude Oil Adhesion Property for Highly Efficient Oil–Water Separation

“…On the other hand, some UiO-66-NH 2 nanoparticles wrapped by CMC could be embedded into the hole of the base membrane, which could be regarded as the anchors for CMC and be conducive to forming the high structural stability of the composite membrane. 44 In addition, it was generally known that UiO-66-NH 2 possessed excellent stability under weak acid and low salt solution conditions but was relatively less stable under alkaline conditions. 45 However, relying on the physical enwinding−wrapping between CMC and UiO-66-NH 2 nano-particles, introduction of CMC effectively inhibited the attack on the UiO-66-NH 2 sites from a weak alkaline environment and endowed the composite membrane with better alkali stability.…”

“…The reason for robust stabilization of the CMC/UiO-66-NH 2 membranes could be ascribed to the following aspects: on the one hand, CMC cellulose macromolecule chains possessed abundant negatively charged carboxyl groups, which could effectively adsorb UiO-66-NH 2 with positively charged amino groups; their synergy effects of electrostatic interaction and physical enwinding–wrapping could prompt the formation of a stable composite layer onto the membrane surface during the self-assembly process. On the other hand, some UiO-66-NH 2 nanoparticles wrapped by CMC could be embedded into the hole of the base membrane, which could be regarded as the anchors for CMC and be conducive to forming the high structural stability of the composite membrane . In addition, it was generally known that UiO-66-NH 2 possessed excellent stability under weak acid and low salt solution conditions but was relatively less stable under alkaline conditions .…”

Demulsification Performance and Mechanism of Tertiary Amine Polymer-Grafted Magnetic Nanoparticles in Surfactant-Free Oil-in-Water Emulsion

“…Therefore, it is of great significance to develop a class of materials to separate the emulsified oil within tens of seconds. Recently, emulsified oil–water separation using magnetic nanoparticles (MNPs) has attracted considerable research attention. , As compared with previously reported filtration/membrane separations, − the magnetic demulsification/separation technique is characterized by convenience, low energy consumption, and high efficiency. At present, magnetic separation exhibits a wide application prospect in the fields of emulsified oil–water separation.…”

Stainless Steel Screen Modified with Renatured Xerogel for Efficient and Highly Stable Oil/Water Separation via Gravity

“…With the increasing amount of oily wastewater and occasional oil spill accidents in the petroleum-based industry, there is a growing need for innovative technology to separate oil from water. − Conventional methods, such as centrifugation, oil fences, and in situ combustion, possess the drawbacks of high operating costs, low separation efficiency, and a prolonged operation time . In light of the background, it is imperative to develop novel methods for recovering oil and other chemical pollutants as well as for removing pure water from the oil/water mixture efficiently and economically. − Due to its cost-effectiveness, high efficiency, and excellent repeatability, the membrane-based separation approach has gained widespread acceptance for wastewater separation. , …”