研究目的
To demonstrate the recovery and reuse of tellurium from waste thermoelectric modules for the synthesis of tellurium nanorods and their application in gas sensing.
研究成果
The research successfully demonstrates an economic and eco-friendly method for synthesizing tellurium nanorods from recovered tellurium in waste electronic devices, with intermediate recovery of bismuth and p-type semiconductors. The tellurium nanorods exhibit excellent NO2 gas sensing properties at room temperature, with low detection limit and fast response times. This approach highlights the potential for integrating nanotechnology with recycling to recover valuable materials from electronic waste, contributing to sustainable resource management.
研究不足
The study uses specific waste thermoelectric modules, which may limit generalizability to other electronic waste types. The synthesis requires precise pH control and use of chemicals like hydrazine, which could pose safety and environmental concerns. The gas sensing performance is tested only for NO2 at room temperature, and scalability to industrial levels is not addressed.
1：Experimental Design and Method Selection:
The study uses chemical leaching and hydrothermal synthesis methods to recover tellurium from waste thermoelectric modules and synthesize tellurium nanorods. The rationale is based on cost-effectiveness, eco-friendliness, and scalability of hydrothermal routes.
2：Sample Selection and Data Sources:
Waste thermoelectric modules are used as the source of tellurium. The semiconductors are separated and treated with acids to obtain precursors.
3：List of Experimental Equipment and Materials:
Equipment includes autoclave, oven, centrifuge, filtration setup, XRD (ULTIMA IV, Rigaku), FE-SEM (Sigma 500, CARL ZEISS), TEM (JEOL 2100F), EDS (EDAX Pegasus 4040, EDAX), ICP-OES (Optima 8300, Perkin Elmer), and gas sensing setup with NI PXle-
4：Materials include HCl, HNO3, NaOH, ethylene glycol, hydrazine monohydrate, PVP (1300K), DI water, isopropyl alcohol, carbon black, and N2/O2 gases. Experimental Procedures and Operational Workflow:
10 Semiconductors are separated from modules, immersed in HCl to remove impurities, dissolved in HNO3, filtered, pH adjusted to 13 with NaOH, reduced with hydrazine to form Bi particles, Bi removed by centrifugation, solution pH adjusted to 7, PVP and hydrazine added, hydrothermal reaction at 160°C for 6 hours, product collected by centrifugation, washed, and characterized. Gas sensing tests involve drop-casting Te NRs on electrodes and measuring resistance changes under NO2 flow.
5：Data Analysis Methods:
XRD for crystal structure, SEM and TEM for morphology, ImageJ for size analysis, EDS and ICP-OES for elemental analysis, and custom software for gas response calculations.
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