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Effect of Pd-Sensitization on Poisonous Chlorine Gas Detection Ability of TiO2: Green Synthesis and Low-Temperature Operation

Summary

Researchers developed a new sensor to detect dangerous chlorine gas using tiny titanium dioxide particles created with help from Ganoderma lucidum mushrooms. The sensor was improved by adding palladium, making it work at much lower temperatures and respond much faster than previous versions. This green synthesis method is environmentally friendly, cost-effective, and could help protect workers and the environment from chlorine gas exposure in industrial settings.

Background

Chlorine gas is a toxic gas widely used in industrial processes including water treatment and paper manufacturing. Metal oxide-based gas sensors have gained attention for environmental monitoring and protection. TiO2 is particularly promising due to its low cost, eco-friendly nature, and suitability for gas detection applications.

Objective

This study aimed to develop a green synthesis method for nanocrystalline TiO2 using Ganoderma lucidum mushroom extract at low temperature and to enhance its chlorine gas sensing properties through Pd-sensitization for improved response and recovery times.

Results

Pd-TiO2 sensors demonstrated superior performance with 136% response at 150°C operating temperature compared to pristine TiO2 (57% response at 250°C) for 100 ppm Cl2. Response/recovery times were significantly improved (16 s/52 s for Pd-TiO2 vs 97 s/56 s for TiO2). The sensors showed excellent selectivity, reproducibility, and 92% stability over 30 days.

Conclusion

Green synthesis of Pd-sensitized TiO2 nanocrystallites using Ganoderma lucidum mushroom extract provides an environmentally friendly, cost-effective approach for developing efficient low-temperature chlorine gas sensors with superior sensing properties compared to pristine TiO2.
  • Published in:Sensors (Basel),
  • Study Type:Experimental Research,
  • Source: PMID: 35684819, DOI: 10.3390/s22114200
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