In this article, we demonstrates the growth of phase pure ZnO nanostructures from Aloe-Vera leaf extract and degradation of an organic dye-Malachite Green (MG)- from aqueous medium using the same as catalyst. Adsorption mechanisms were evaluated using Lagergren’s pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. X-Ray diffraction data showed that the synthesised ZnO is crystalline with hexagonal wurtzite phase. Average crystallite size and lattice strain was estimated from Scherrer equation and Williamson-Hall analysis with the help of Rietveld refinement data. Crystallite size obtained from Scherrer method is 12.62 nm while that from Williamson-Hall analysis is 19.27 nm. Uniform growth of ZnO nano-sheets were confirmed by FE-SEM analysis. Optical characterisation was carried by UV-Visible spectroscopy and the band gap ZnO nanoparticles was found to be 3.19 eV. Zn-O stretching vibrations were recorded at 550 cm⁻¹ using FTIR spectrophotometer. Results showed that biosynthesised ZnO nanosheets are particularly effective for the degradation of MG dye.

在本文中，我们展示了来自芦荟的纯相 ZnO 纳米结构的生长使用相同的催化剂从水介质中提取和降解有机染料 - 孔雀石绿（MG）。使用 Lagergren 的伪一级、伪二级和颗粒内扩散动力学模型评估吸附机制。X 射线衍射数据表明合成的 ZnO 是具有六方纤锌矿相的结晶。在 Rietveld 精修数据的帮助下，从 Scherrer 方程和 Williamson-Hall 分析估计平均微晶尺寸和晶格应变。从 Scherrer 方法获得的微晶尺寸为 12.62 nm，而从 Williamson-Hall 分析获得的微晶尺寸为 19.27 nm。通过FE-SEM分析证实了ZnO纳米片的均匀生长。通过紫外-可见光谱进行光学表征，发现带隙 ZnO 纳米颗粒为 3.19 eV。⁻¹使用 FTIR 分光光度计。结果表明，生物合成的 ZnO 纳米片对 MG 染料的降解特别有效。