Viện KH&CN thông báo lịch seminar thường kỳ của Viện tháng 1-2024

- Thời gian: 10h00, 9/1/2024 (thứ ba)

- Địa điểm: Phòng họp số 1 - Tầng 4 - Nhà Hiệu bộ - Trường Đại học Khoa học

- Báo cáo viên: TS. Nguyễn Thị Luyến

- Chủ đề: One-step Pyrolysis of Nano Oxide Materials and Biochar for Highly Efficient Waste Water Removal from Aqueous Solution

 

we developed a facile one-step pyrolysis method for preparing porous nano oxide and biochar with a large surface area to enhance the removal efficiency of waste water from aqueous solution. Agriculture waste were pyrolyzed under oxygen-limited conditions with a molten salt such FeCl₂, ZnCl₂ which played the roles of activating agent and precursor for the formation of nanoparticles. The effects of mass ratio between the molten salt and the agriculture waste as well as pyrolysis temperature on the formation of nanocomposites were investigated. The prepared nanocomposites were evaluated for textural characteristics such as crystalline structure, surface chemical functional groups, vabriation mode, magnetic properties, pore structure, morphology and the adsorption capacity using the methods such as X-ray diffraction, Fourier transform infrared spectroscopy, Raman spectra, vibrating sample magnetometer, N₂ adsorption-desorption isotherms, scanning electron microscopy and transmission electron microscopy. Characterization results revealed that the as-synthesized nanocomposites exhibited a highly porous structure with a specific surface area suggesting a good adsorbent for efficient removal of waste water. The formation mechanism of nanoparticles on the biochar surface was due to molten salt vaporization and reaction with water molecules extracted from the lignocellulosic structures. This study provides a basis for developing a simple and large-scale synthesis method for wastewater with a high adsorption capacity.