MOF-Like 3D Graphene-Based Catalytic Membrane Fabricated by One-Step Laser Scribing for Robust Water Purification and Green Energy Production

Abstract

Increasing both clean water and green energy demands for survival and development are the grand challenges of our age. Here, we successfully fabricate a novel multifunctional 3D graphene-based catalytic membrane (3D-GCM) with active metal nanoparticles (AMNs) loading for simultaneously obtaining the water purification and clean energy generation, via a “green” one-step laser scribing technology. The as-prepared 3D-GCM shows high porosity and uniform distribution with AMNs, which exhibits high permeated fluxes (over 100 L m−2 h−1) and versatile super-adsorption capacities for the removal of tricky organic pollutants from wastewater under ultra-low pressure-driving (0.1 bar). After adsorption saturating, the AMNs in 3D-GCM actuates the advanced oxidization process to self-clean the fouled membrane via the catalysis, and restores the adsorption capacity well for the next time membrane separation. Most importantly, the 3D-GCM with the welding of laser scribing overcomes the lateral shear force damaging during the long-term separation. Moreover, the 3D-GCM could emit plentiful of hot electrons from AMNs under light irradiation, realizing the membrane catalytic hydrolysis reactions for hydrogen energy generation. This “green” precision manufacturing with laser scribing technology provides a feasible technology to fabricate high-efficient and robust 3D-GCM microreactor in the tricky wastewater purification and sustainable clean energy production as well.

Microreactor-based micro/nanomaterials: fabrication, advances, and outlook

“…36,64,65 Moreover, to optimize the cost of X-raybased lithography, cheaper lithography light sources and mask manufacturing processes have emerged. For example, laser-LIGA technology uses an excimer laser as a light source for lithography, 66 and mask making by micro electro-discharge machining (EDM) technology. 67 Generally, the LIGA technique comprises three phases: (i) the pattern is transferred to a photoresist (which is typically a resin-type material placed on an electrically conductive or conductive coating), (ii) removing the mask and any undesirable structural layers and electroplating by the short wavelength X-ray radiations to form a relief structure onto the substrate area, and (iii) the withdrawal of the excess electrodeposited material and photoresist or epoxy after metal structures are formed by photoirradiation.…”

CuCo Nanoparticle, Pd(II), and l-Proline Trifunctionalized UiO-67 Catalyst for Three-Step Sequential Asymmetric Reactions

“…Metal–organic frameworks (MOFs), which consist of metal nodes and bridging ligands, are regarded as a kind of promising and tunable supports for different active sites to construct multifunctional catalysts because of their thermal/chemical stability, ,− adjustable porous frameworks, well-defined structures, , high density of uniformed catalytic sites, and crystalline nature for easily elucidating structure–function relationships. − Numerous MOF-based heterogeneous catalysts have been successfully synthesized and reported in the past decade via precisely introducing programmed catalytic sites into their frameworks. − Such active sites can be divided into active metal nodes (including uncoordinated metal centers as Lewis acid and organic/inorganic catalysts ligated to metal nodes), functional organic linkers via coordination interaction or covalent linkage, and encapsulated active species (such as metal/bimetal nanoparticles − and polymers and enzymes) (Figure a). The combination and cooperation of two or more of such active sites, which are spatially distributed in MOFs, promote MOFs to be promising multifunctional catalysts for multi-step sequential reactions.…”

A Novel P@SiO2 Nano-Composite as Effective Adsorbent to Remove Methylene Blue Dye from Aqueous Media

“…Several strategies have been investigated and developed to purify water from such harmful material, including photocatalytic degradation, solvent extraction, coagulation, biodegradation, oxidation, zonation, and adsorption [ 5 , 8 , 9 ]. Adsorption, among the techniques, is the most powerful, economical, and efficient technique utilized to decontaminate dyes from wastewater at low concentrations due to its simplicity, low cost, and not requiring advanced technology [ 10 , 11 , 12 , 13 ]. During this year, novel adsorbent materials have been reported to remove toxic dyes such as methylene blue from wastewater [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”