One object (MOFs catalyst and light) with multiple purposes: The photocatalytic precursor detoxification and photo-induced green synthesis for fabrication of eco-friendly filtrate reducer

Abstract

With the increasingly stringent environmental rules around the world, new drilling fluid additives having high efficiency, non-biotoxicity and low cost by green synthesis strategy will be the developing trends. Herein, under acting on the prefabricated MIL-Fe/NH₂-D(5) photocatalyst, the photo-induced detoxification of toxic sulfonated phenolic resin (SMP-3) was successfully completed for the first time, which further photopolymerized with tea polyphenol (TP), acrylamide (AM) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) to prepare eco-friendly fluid loss agent LI-3. The homemade MIL-Fe/NH₂-D(5) demonstrates dramatically increased light absorption in UV–VIS-NIR range with a significantly reduced band gap of 1.68 eV, and exhibits excellent efficiency of separating interface charges with rapid transfer dynamic. As expected, LI-3 filtrate reducer effectively controls the rheology of slurry, and possesses excellent loss-reducing properties even at high temperatures and high salinity conditions. Compared with base mud, the filtrate volumes of LI-3/BT-WBDFs containing 2.0 % LI-3 are reduced by 83.91 % and 83.42 % before and after aging at 180 °C, respectively. Finally, the possible mechanisms involved are explored. Particularly in both photo-induced detoxification and green synthesis periods, the photo thermal conversion based on localized surface plasmon resonance (LSPR) ensures mild conditions with energy saving.