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Reviewing variables and their implications affecting adsorption of Cr(VI) onto activated carbon: an in-depth statistical case study

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Abstract

Removal of Cr(VI) from the aqueous phase using numerous activated carbons (AC) has been broadly studied in the last decades. Nevertheless, the diversity of activation methods, AC properties, and adsorption conditions precludes the standardization of specific characteristics required to achieve better adsorption results. This work reviewed the pertinent literature on Cr(VI) adsorption onto AC published over the past four decades. Pearson’s correlation matrix and principal component analysis (PCA) assisted in identifying the parameters and AC characteristics that have the greatest influence on the maximum adsorption capacity (qm). Two hundred thirty-six adsorption assays were found reporting data on 110 ACs and different parameters. Of these, 39.8% of the studies contemplated the variables qm, pH, temperature (T), surface area (SBET), micropore volume (Vmicro), and mesopore volume (Vmeso), and only 19.5% reported the point of zero charge (pHPZC). Statistical analysis disclosed that SBET and Vmicro have a strong positive correlation with qm, while Vmeso, T, and pH show little or no correlation. The difference between pH and pHPZC (PZCdiff) indicated a significant anticorrelation with qm, thus evidencing that lower PZCdiff values enhance adsorption. The findings are useful for all researchers that work with Cr(VI) adsorption on AC since they provide a start point concerning the required adsorbent characteristics and process conditions to be employed.

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The data and methods not presented in the manuscript can be found in the supplementary material;

Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior — Brasil (CAPES) — Finance Code 001.

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Lucas Mironuk Frescura, conceptualization, writing — original draft, writing — review and editing, formal analysis, investigation, and software. Bryan Brummelhaus de Menezes, conceptualization, methodology, software, formal analysis, investigation, writing — original draft, and writing — review and editing. Sabrina Frantz Lütke, investigation, writing — original draft, and preparation. Ronaldo A.F. Junior, investigation, writing — original draft, and preparation. Guilherme Luiz Dotto, writing — review and editing. Marcelo Barcellos da Rosa, supervision, resources, and writing — review and editing.

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Correspondence to Marcelo Barcellos da Rosa.

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The authors declare that no experiments were performed on humans or animals for this study.

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The authors declare no competing interests.

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Responsible Editor: Philippe Garrigues

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Frescura, L.M., de Menezes, B.B., Lütke, S.F. et al. Reviewing variables and their implications affecting adsorption of Cr(VI) onto activated carbon: an in-depth statistical case study. Environ Sci Pollut Res 29, 49832–49849 (2022). https://doi.org/10.1007/s11356-022-19169-z

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  • DOI: https://doi.org/10.1007/s11356-022-19169-z

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