Li, Jiaxin;
Shen, Tianyang;
Wang, Huijuan;
Li, Shaoquan;
Wang, Jikang;
Williams, Gareth R;
Zhao, Yufei;
... Song, Yu-Fei; + view all
(2022)
Insights into the Superstable Mineralization of Chromium(III) from Wastewater by CuO.
ACS Applied Materials & Interfaces
, 14
(33)
pp. 37823-37832.
10.1021/acsami.2c10298.
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Abstract
The removal of Cr^{III} ions from contaminated wastewater is of great urgency from both environmental protection and resource utilization perspectives. Herein, we developed a superstable mineralization method to immobilize Cr^{3+} ions from wastewater using CuO as a stabilizer, leading to the formation of a CuCr layered double hydroxide (denoted as CuCr-LDH). CuO showed a superior Cr^{3+} removal performance with a removal efficiency of 97.97% and a maximum adsorption capacity of 207.6 mg/g in a 13000 mg/L Cr^{3+} ion solution. In situ and ex situ X-ray absorption fine structure characterizations were carried out to elucidate the superstable mineralization mechanism. Two reaction pathways were proposed including coprecipitation–dissolution and topological transformation. The mineralized product of CuCr-LDH can be reused for the efficient removal of organic dyes, and the adsorption capacities were up to 248.0 mg/g for Congo red and 240.1 mg/g for Evans blue, respectively. Moreover, CuCr-LDH exhibited a good performance for photocatalytic CO2 reduction to syngas (H_{2}/CO = 2.66) with evolution rates of 54.03 μmol/g·h for CO and of 143.94 μmol/g·h for H2 under λ > 400 nm, respectively. More encouragingly, the actual tanning leather Cr^{3+} wastewater treated by CuO showed that Cr^{3+} can reduce from 3438 to 0.06 mg/L, which was much below discharge standards (1.5 mg/L). This work provides a new approach to the mineralization of Cr^{3+} ions through the “salt-oxide” route, and the findings reported herein may guide the future design of highly efficient mineralization agents for heavy metals.
| Type: | Article |
|---|---|
| Title: | Insights into the Superstable Mineralization of Chromium(III) from Wastewater by CuO |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acsami.2c10298 |
| Publisher version: | https://doi.org/10.1021/acsami.2c10298 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions |
| Keywords: | Cr^{3+} ions, layered double hydroxide, superstable mineralization, reutilization, photocatalytic CO_{2} reduction |
| UCL classification: | UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy > Pharmaceutics UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10153846 |
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