研究目的
To investigate the synthesis of ZnO nanorods via hydrothermal route and their application for the adsorption of Cr(VI) ions from aqueous medium.
研究成果
ZnO nanorods synthesized via hydrothermal route showed promising adsorption efficiency for Cr(VI) ions, with a maximum adsorption capacity of 250 mg/g. The adsorption process was best described by the pseudo-second-order kinetic model and Langmuir isotherm, indicating a monolayer chemisorption process. The process was found to be spontaneous and endothermic. ZnO nanorods could be effectively used for the removal of Cr(VI) ions from wastewater and potentially for other heavy metals.
研究不足
The study focuses on the adsorption of Cr(VI) ions onto ZnO nanorods under specific conditions. The applicability of the findings to other heavy metals or under different environmental conditions was not explored.
1：Experimental Design and Method Selection:
Hydrothermal synthesis was chosen for the fabrication of ZnO nanorods. Zinc nitrate hexahydrate and Triton-x 100 were used as precursors and capping agent, respectively.
2：Sample Selection and Data Sources:
ZnO nanorods were synthesized and characterized using UV-visible spectroscopy, FTIR, SEM, and EDX techniques.
3：List of Experimental Equipment and Materials:
Zinc nitrate hexahydrate, Triton-x 100, potassium dichromate, sodium hydroxide, nitric acid, methanol, T90+ Spectrometer, 7000-FTIR Varian, scanning electron microscope (SEM), energy dispersive X-Ray analyzer (EDX), Thermo Scientific pH meter, PerkinElmer flame atomic absorption spectrophotometer (FAAS).
4：Experimental Procedures and Operational Workflow:
The synthesis involved mixing NaOH solution with Zn(NO3)2.6H2O solution containing Triton X-100, stirring, transferring to a Teflon lined steel autoclave, and heating. The product was then centrifuged, washed, and dried.
5：6H2O solution containing Triton X-100, stirring, transferring to a Teflon lined steel autoclave, and heating. The product was then centrifuged, washed, and dried.
Data Analysis Methods:
5. Data Analysis Methods: Adsorption capacity and percentage removal were calculated using specific equations. The effect of various parameters on adsorption was studied, and data was analyzed using Langmuir and Freundlich isotherm models, pseudo-first and pseudo-second order kinetic models, and intra-particle diffusion model.
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