The Potential of Spent Coffee Grounds @ MOFs Composite Catalyst in Efficient Activation of PMS to Remove the Tetracycline Hydrochloride from an Aqueous Solution

Wei Zhang; Jiajia Lu; Shoushu Liu; Chen Wang; Qiting Zuo; Lin Gong

doi:10.3390/toxics11020088

The Potential of Spent Coffee Grounds @ MOFs Composite Catalyst in Efficient Activation of PMS to Remove the Tetracycline Hydrochloride from an Aqueous Solution

Toxics. 2023 Jan 17;11(2):88. doi: 10.3390/toxics11020088.

Authors

Wei Zhang^{1

2

3

4

5}, Jiajia Lu¹, Shoushu Liu¹, Chen Wang¹, Qiting Zuo^{2

3

6}, Lin Gong^{1

2

3

4

5}

Affiliations

¹ School of Ecology and Environment, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, China.
² Yellow River Institute for Ecological Protection and Regional Coordination Development, Zhengzhou University, 100 Kexue Avenue, Zhengzhou 450001, China.
³ Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Pingdingshan 467036, China.
⁴ Henan International Joint Laboratory of Water Cycle Simulation and Environmental Protection, Zhengzhou 450001, China.
⁵ Zhengzhou Key Laboratory of Water Resource and Environment, Zhengzhou 450001, China.
⁶ School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China.

Abstract

The efficient removal of Tetracycline Hydrochloride (TC) from wastewater, which is a difficult process, has attracted increasing attention. Aiming to synchronously achieve the goal of natural waste utilization and PMS activation, we have combined the MOFs material with waste coffee grounds (CG). The catalytic activity of the CG@ZIF-67 composite in the TC removal process was thoroughly evaluated, demonstrating that the TC removal rate could reach 96.3% within 30 min at CG@ZIF-67 composite dosage of 100 mg/L, PMS concertation of 1.0 mM, unadjusted pH 6.2, and contact temperate of 293.15 K. The ¹O₂ and ·SO₄^- in the CG@ZIF-67/PMS/TC system would play the crucial role in the TC degradation process, with ¹O₂ acting as the primary ROS. The oxygen-containing functional groups and graphite N on the surface of CG@ZIF-67 composite would play a major role in efficiently activating PMS and correspondingly degrading TC. In addition, the CG@ZIF-67/PMS/TC system could withstand a wide pH range (3-11). The application of CG in preparing MOF-based composites will provide a new method of removing emerging pollutants from an aqueous solution.

Keywords: CG@ZIF-67 composite; peroxymonosulfate; tetracycline hydrochloride; utilization of natural waste.

Grants and funding

52000163/Natural Sciences Foundation of China