What question did this study set out to answer?

To determine the kinetics and molecular removal mechanisms of Cr(VI) reduction by humic acids derived from lignite and peat across terrestrial pH ranges.

December 18, 2018Environmental Science and Pollution ResearchOpen Access

Abiotic reduction of Cr(VI) by humic acids derived from peat and lignite: kinetics and removal mechanism

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Authors

SASuha T. AldmourMutah University IBIan T. BurkeUniversity of Leeds ABAndrew W. BrayUniversity of Leeds

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Implication

Experimental analysis reveals abiotic reduction and removal of Cr(VI) by peat and lignite humic acids across environmental pH levels, highlighting remediation potential.

Key Points

To determine the kinetics and molecular removal mechanisms of Cr(VI) reduction by humic acids derived from lignite and peat across terrestrial pH ranges.
Measured Cr(VI) reduction kinetics across a pH gradient (3.7 to 10.5) in aqueous suspensions of humic acids isolated from Miocene lignite and peat.
Identified humic acid structural modifications and chromium binding environments using 13C NMR, pyrolysis GC-MS, and X-ray absorption spectroscopy.
Cr(VI) was reduced to Cr(III) through a first-order reaction with respect to Cr(VI) concentration and a partial-order (~0.5) dependency on [H+].
Peat humic acid exhibited faster reduction than lignite across all tested pH conditions (3.7 ≤ pH ≤ 10.5).
Spectroscopy revealed that ester formation consumed phenolic and hydroxyl moieties, yielding Cr(III) that formed an inner-sphere adsorption complex with degraded humic acid.

Cite This Study

Aldmour et al. (2018) studied this question.

synapsesocial.com/papers/6a721e2c75498292b70b5943 https://doi.org/10.1007/s11356-018-3902-1

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Implication

Experimental analysis reveals abiotic reduction and removal of Cr(VI) by peat and lignite humic acids across environmental pH levels, highlighting remediation potential.

Abiotic reduction of Cr(VI) by humic acids derived from peat and lignite: kinetics and removal mechanism

Discussion

Member takes

Implication

Key Points

Cite This Study

Abiotic reduction of Cr(VI) by humic acids derived from peat and lignite: kinetics and removal mechanism

Discussion

Member takes

Implication

Key Points

Cite This Study

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