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On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
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MIL-125-NH2@Co-HHTP based solid phase microextraction for vulcanization accelerators determination in water samples
Long Pang1, Haiyang Feng1, Xingru Hu1
1School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, 450002, China.
Environmental Research
|May 7, 2026
Summary
A novel MOF-on-MOF heterojunction coating efficiently detects toxic vulcanization accelerators (VAs) in water. This sensitive method offers a reliable approach for environmental monitoring of these persistent pollutants.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
- Materials Science
Background:
- Vulcanization accelerators (VAs) are persistent toxic pollutants in aquatic environments.
- Trace detection of VAs is challenging due to their low concentrations and complex matrices.
- Development of sensitive and reliable analytical methods for VA monitoring is crucial for environmental and human health protection.
Purpose of the Study:
- To construct a novel MOF-on-MOF heterojunction (MIL-125-NH2@Co-HHTP) for solid-phase microextraction (SPME).
- To develop an efficient method for the trace determination of benzothiazole (BTA), 1,3-diphenylguanidine (DPG), and N-cyclohexyl-2-benzothiazolesulfenamide (CBS) in water samples.
- To investigate the synergistic effects and immobilization mechanisms of VAs on the MOF-based heterojunction coating.
Main Methods:
- Fabrication of a MOF-on-MOF heterojunction coating (MIL-125-NH2@Co-HHTP) for SPME.
- Coupling the SPME method with gas chromatography-flame photometric detection (GC-FPD) for VA analysis.
- Optimization of extraction conditions and characterization of the coating using FTIR, XPS, and electrostatic potential calculations.
Main Results:
- The developed SPME method achieved wide linear ranges (0.5-200 μg L-1) and low detection limits (0.14-0.29 μg L-1) for BTA, DPG, and CBS.
- The MOF-based coating exhibited high enrichment factors (22.2-60.1) and excellent reusability (>40 cycles).
- The heterojunction coating demonstrated superior extraction performance compared to a commercial fiber, with high spike recoveries (87.5-105.1%) in real water samples.
Conclusions:
- The MOF-on-MOF heterojunction coating provides a sensitive, reliable, and reusable platform for the trace determination of VAs in aquatic environments.
- Synergistic effects, including hydrogen bonding, π-π stacking, and coordination interactions, enhance VA immobilization and extraction efficiency.
- This work highlights the potential of MOF-based heterojunction materials in advanced sample preparation for environmental pollutant monitoring.
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