ArticleScientific reports2025
Removal of hexavalent chromium from contaminated synthetic groundwater via functionalized carbon nanomaterials modified with zinc and potassium.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
1 citing paper in PubMed.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Chromium has been shown to be a significant contributor to water pollution, leading to cancer. This study aimed to investigate the potential of various functionalized carbon nanomaterials for removing Cr(VI) from synthetic groundwater. Functionalized carbon nanomaterials with layered and tube-like structures were designed on the basis of thermal methods (KOH-activated micrographite sheets) and impregnation methods by anchoring K and Zn on carbon nanotubes (CNTs), respectively, for the removal of Cr(VI) from contaminated synthetic groundwater. Several experimental parameters, including the concentration of the solution, pH, adsorbent dosage, and duration of contact, were systematically varied in a series of batch experiments. The optimal conditions were determined to be a 30 mg/20 mL adsorbent dosage (after the dosage test was 5-50 mg), a pH of 2 (tested at 1-240 min), and a constant agitation speed for all adsorbents. The maximum Cr(VI) removal by K-CNTs (83.04%) occurred at pH 4 and 25 °C and at a constant agitation speed. Zn-CNTs achieved up to 79% removal efficiency at pH 2. However, at neutral pH (8), only K-CNTs maintained a high removal capacity (97%), whereas the other adsorbents exhibited an approximately 53% decrease in removal efficiency. The Cr(VI) removal efficiency reached 95% and 32.7% after five adsorption/desorption cycle tests for K and Zn-CNTs, respectively, at pH = 8, and K-CNTs achieved 91% removal after six cycles, which is particularly noteworthy. Fourier transform infrared (FTIR) spectroscopy was employed to observe the adsorption processes in the polluted water samples, both before and after treatment. The results indicated an increase in the specific surface area and beneficial development of adsorption sites on the CNTs. To elucidate the adsorption mechanisms, the experimental data were analyzed via various isotherm models, namely, the Langmuir, Freundlich, Temkin, and Sips models. Additionally, the adsorption kinetics were examined via pseudo-first-order and pseudo-second-order kinetic models to characterize the temporal aspects of the adsorption process.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.