研究目的
To synthesize reduced graphene oxide with columnar-shaped ZnO composites and evaluate their photocatalytic performance with natural dye under sunlight irradiation.
研究成果
The two-step synthesis method successfully produced columnar-shaped ZnO structures in rGO composites, with improved crystallinity and reduction. The morphology significantly influenced optical absorption and photocatalytic activity, achieving up to 64.40% degradation of natural dye under sunlight in 120 minutes. The composites show promise for photocatalytic applications, with recommendations for future studies on optimizing conditions and exploring other morphologies.
研究不足
The study is limited to specific pH conditions (6, 9, 12) and rGO concentrations (0.01, 0.03, 0.05 mg/mL). The photocatalytic efficiency of 64.40% might be optimized further, and the reusability showed slight decreases due to photo-corrosion. The method may not be scalable for industrial applications without further refinement.
1：Experimental Design and Method Selection:
A two-step synthesis method was used, involving the preparation of reduced graphene oxide (rGO) via the modified Hummers Hoffman method and subsequent composite formation with ZnO by varying pH conditions (6, 9, 12). This method was chosen for its low complexity, cost-effectiveness, purity, and ability to produce columnar structures.
2：2). This method was chosen for its low complexity, cost-effectiveness, purity, and ability to produce columnar structures.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Commercially available highly pyrolytic graphite (HOPG) flakes and analytical grade chemicals (e.g., ZnSO4·7H2O, H2SO4, NaOH) were used. Natural dye was extracted from Ficus religiosa leaves.
3：List of Experimental Equipment and Materials:
Equipment included X-ray diffractometer (Bruker D8), SEM (Zeiss EVO 18), HR-TEM (FEI TECHNAI G220), FTIR spectrometer (IS10 Nicolet), UV-visible absorption spectrometer (Jasco V-770), and centrifuge. Materials included graphite powder, acids, salts, and ethanol.
4：Experimental Procedures and Operational Workflow:
rGO was synthesized by oxidizing graphite with acids and KMnO4, then reducing it. Composites were prepared by mixing rGO with ZnSO4 solution, adding NaOH to adjust pH, centrifuging, washing, drying, and grinding. Characterization involved XRD, SEM, TEM, FTIR, UV-vis, and Raman spectroscopy. Photocatalytic tests were conducted by exposing composites to sunlight with natural dye and measuring degradation over time.
5：Data Analysis Methods:
XRD data were analyzed using Scherer's formula and Williamson-Hall method for crystallite size and strain. UV-vis data were used to calculate band gaps. Photocatalytic degradation efficiency was calculated based on concentration changes, and kinetics were analyzed using first-order reaction models.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
