Selective and Efficient Removal of Fluoride from Water: In Situ Engineered Amyloid Fibril/ZrO₂ Hybrid Membranes

Abstract

We report a new strategy for efficient removal of F− from contaminated water streams, and it relies on carbon hybrid membranes made of amyloid fibril/ZrO2 nanoparticles (<10 nm). These membranes exhibit superior selectivity for F− against various competitive ions, with a distribution coefficient (Kd) as high as 6820 mL g−1, exceeding commercial ion‐exchange resins (IRA‐900) by 180 times and outdoing the performance of most commercial carbon‐activated aluminum membranes. At both low and high (ca. 200 mg L−1) F− concentrations, the membrane efficiency exceeds 99.5 % removal. For real untreated municipal tap water (ca. 2.8 mg L−1) under continuous operating mode, data indicates that about 1750 kg water m−2 membrane can be treated while maintaining drinking water quality, and the saturated membranes can be regenerated and reused several times without decrease in performance. This technology is promising for mitigating the problem of fluoride water contamination worldwide.

Synthesis of a novel magnetic Caragana korshinskii biochar/Mg–Al layered double hydroxide composite and its strong adsorption of phosphate in aqueous solutions

“…7b) could be tted to three peaks, namely, O 2À at 529.5 eV, OH À at 530.4 eV, and CO 3 2À at 531.4 eV. 16,45,46 Aer phosphate adsorption, the area ratio XPS spectra (Fig. 2b) of FCB/MAC before and aer adsorption were similar, indicating that the iron oxide did not participate in the adsorption process.…”

Half a century of amyloids: past, present and future

“…25,456,458 The concept has further been extended to remove halogen contaminants from water, such as in the case of fluoride, by first capturing transition metals on the fibrils, then growing them in situ into fine transition metal nanoparticles, which finally, by adhering to the amyloid surface, are capable of binding targeted fluoride contaminants. 459 The growth of metal ions on the surface of amyloids into metal nanoparticles conjugated to the amyloid fibrils can be further exploited for applications as diverse as heterogeneous catalysis 460 and human nutrition. For example, by growing iron oxide nanoparticles from Fe 2+ bound on the surface of b-lactoglobulin amyloid fibrils, Shen et al 24 showed that the resulting hybrids maintained iron at the right oxidation state (i.e., the II form, which is more bioavailable than the III form), which could then be used to target iron deficiency in vivo.…”

Constructing Hierarchical Porous Carbons With Interconnected Micro-mesopores for Enhanced CO2 Adsorption

“…In the past decade, various types of solid sorbents have been attempted for CCS. Examples include zeolites (Megías-Sayago et al, 2019), modified porous silicas (Dassanayake et al, 2017), metal organic frameworks (MOFs) (Shi et al, 2019), calcium looping sorbents (Zhu et al, 2017), polymer membranes (Ahmad et al, 2016;Zhang et al, 2019), and nanoporous carbons (NCs) . In particular, MOFs and NCs have received much attention due to their excellent capture performance.…”