Uranium(VI) adsorption from carbonate solutions using cetyltrimethylammonium bromide modified purified-bentonite-MOF composite
Source abstract
Abstract
A novel cetyltrimethylammonium bromide (CTABr) modified purified-bentonite ( p-Bent)-MOF composite (CTABr/ p-Bent-Co 2(OH) 2 BDC) was first prepared to study the uranium(VI) adsorption from a variety of carbonate solutions. The experiments showed that at pH 8.0, the high concentration of carbonates and halides significantly suppressed the U VI adsorption. Compared with Co 2(OH) 2BDC (4.3 ± 0.9 mg·g −1), p-Bent (47.2 ± 3.7 mg·g −1), and CTABr/ p-Bent (104.8 ± 0.8 mg·g −1), this ternary composite achieved an improved adsorption capacity of 111.7 ± 1.4 mg·g −1 . The XPS spectra and DFT calculations indicated that carbonates and halides can compete for free uranyl ions with the –COOH and –OH groups on the composite surface. Particularly, CO 3 2− and F − can inhibit the U VI adsorption from carbonate solutions by forming uranyl carbonates and uranyl fluorides. The Br − anion exchange and electrostatic attraction were demonstrated to be the dominant mechanisms for U VI adsorption on the composite, together with the –COOH/–OH complexation. This work presents a feasible strategy to prepare new clay-based multicomponent composites for extracting uranium from carbonate solutions, and provides new insight into the understanding of uranium adsorption in natural waters.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Radioactive element chemistry and processing · Geochemistry and Elemental Analysis · Mercury impact and mitigation studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (73)
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