Anti-stacking, recyclable and electron-rich Fe3O4 modified L-glutamic acid functionalized graphene oxide towards Cr(VI) removal by adsorption-reduction behavior

Separation and Purification Technology, Journal Year: 2025, Volume and Issue: unknown, P. 132090 - 132090

Published: Feb. 1, 2025

Language: Английский

Hybrid Adsorption–Microfiltration Process for the Pretreatment of Sulfide-Containing Seawater: A Promising Strategy to Mitigate Membrane Fouling

Membranes, Journal Year: 2025, Volume and Issue: 15(4), P. 100 - 100

Published: March 31, 2025

The presence of dissolved sulfides in feed seawater causes severe elemental sulfur fouling the reverse osmosis (RO) process. However, current pretreatment methods suffer from large footprint, high energy consumption, and limitations effluent quality. In this study, adsorption microfiltration are merged into a single process for sulfide-containing seawater. Powdered activated carbon (PAC) was selected its superior capacity (14.6-fold) faster kinetics (3.9-fold) sulfide removal compared to granular carbon. surface area multiple pore structures PAC facilitate intraparticle diffusion, as well anion–π conjugation likely occur between sulfide. Polypropylene microporous membranes, capable tolerating dosages, were used hybrid Long-term pilot tests demonstrated that (turbidity < 1 NTU SDI15 ≈ 2.50) met quality requirements RO unit feedwater, achieving 100% efficiency over 101 h, with no risk leakage throughout entire operation formation loose, porous cake layer alleviates membrane enhances retention metal(loid)s Moreover, low permeate flux polymeric membranes significantly mitigates filter formation. system adapts variations feedwater quality, making it highly suitable desalination plants limited space budget. These findings offer valuable insights practical guidance advancing pretreatment.

Language: Английский

Preparation of graphene aerogel with three-dimensional soft layered structure using waste graphite as precursor for efficient removal of Cr(Ⅵ) from wastewater

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 116727 - 116727

Published: April 1, 2025

Language: Английский