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Copper-based ternary hydrotalcite as a catalyst for hydroxylation of phenolic compounds
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Copper-based ternary hydrotalcite as a catalyst for hydroxylation of phenolic compounds. / Dai, Rongrong; Liu, Baogui; Zhang, Yan et al.
In: Journal of Environmental Chemical Engineering, Vol. 9, No. 6, 106390, 12.2021.Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review
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TY - JOUR
T1 - Copper-based ternary hydrotalcite as a catalyst for hydroxylation of phenolic compounds
AU - Dai, Rongrong
AU - Liu, Baogui
AU - Zhang, Yan
AU - Pedersen, Jacob Nedergaard
AU - Zhang, Xiaowen
AU - Dong, Mingdong
AU - Guo, Zheng
PY - 2021/12
Y1 - 2021/12
N2 - Hydrotalcites with different cations were synthesized by co-precipitation method and characterized using different techniques. The catalytic activity of the hydrotalcites was studied using hydroxylation of phenol by H 2O 2 as a model reaction. The CuNiAl ternary hydrotalcite was found to be the best catalyst in this work; and the effects of reaction temperature, ratio of substrate:catalyst, H 2O 2 concentration, solvent and pH value of the medium were investigated. The results showed that under optimal reaction conditions, the conversion of phenol can reach up to 62.8%, with catechol and hydroquinone as the main products. The substrate scope was expanded to other phenol-derivatives, such as m-cresol and 3-ethylphenol. A plausible reaction mechanism was proposed based on the control reactions and XPS analysis. The CuNiAl hydrotalcite shows high toxicity (the 48 h LC 50 value of CuNiAl hydrotalcite was 2.12 mg/L) in the acute toxicity tests of Daphnia magna. However, after simple filtration of the solid catalyst, the 48 h LC 50 value of the remaining solution was increased to 83.46 mg/L. In all, the as-synthesized CuNiAl35 hydrotalcite offers a novel biodegradation pathway for in situ treatment of phenol-contaminated water or other phenolic pollutions when applied together with dioxygenases for further degradation of resulting catechols or hydroquinones.
AB - Hydrotalcites with different cations were synthesized by co-precipitation method and characterized using different techniques. The catalytic activity of the hydrotalcites was studied using hydroxylation of phenol by H 2O 2 as a model reaction. The CuNiAl ternary hydrotalcite was found to be the best catalyst in this work; and the effects of reaction temperature, ratio of substrate:catalyst, H 2O 2 concentration, solvent and pH value of the medium were investigated. The results showed that under optimal reaction conditions, the conversion of phenol can reach up to 62.8%, with catechol and hydroquinone as the main products. The substrate scope was expanded to other phenol-derivatives, such as m-cresol and 3-ethylphenol. A plausible reaction mechanism was proposed based on the control reactions and XPS analysis. The CuNiAl hydrotalcite shows high toxicity (the 48 h LC 50 value of CuNiAl hydrotalcite was 2.12 mg/L) in the acute toxicity tests of Daphnia magna. However, after simple filtration of the solid catalyst, the 48 h LC 50 value of the remaining solution was increased to 83.46 mg/L. In all, the as-synthesized CuNiAl35 hydrotalcite offers a novel biodegradation pathway for in situ treatment of phenol-contaminated water or other phenolic pollutions when applied together with dioxygenases for further degradation of resulting catechols or hydroquinones.
KW - Catechol
KW - Cu-containing hydrotalcites
KW - Daphnia magna
KW - Hydroxylation
KW - Phenol
KW - Toxicity
U2 - 10.1016/j.jece.2021.106390
DO - 10.1016/j.jece.2021.106390
M3 - Journal article
VL - 9
JO - Journal of Environmental Chemical Engineering
JF - Journal of Environmental Chemical Engineering
SN - 2213-3437
IS - 6
M1 - 106390
ER -