Authors : Thuan Van Tran, Bich Ngoc Hoang, Hien Thien Tran, Nhan Phu Thuong Nguyen, Van Thi Thanh Ho, Nguyen Dai Hai, Vu Dai Cao, Trinh Duy Nguyen and Long Giang Bach
Abstract: Tea waste is a abundant and low-cost biomass resource for preparation of Activated Carbons (ACs) The present study addressed a pyrolysis route using KOH as an activating agent to develop with new pores of the ACs from tea industry waste. The effects of activation temperatures (600-800°C) on the structure of ACs were investigated. Characteristics of ACs were analyzed by several physical techniques such as analysis methods including X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Thermo-Gravimetric Analysis (TGA) and nitrogen adsorption/desorption. The characterization results indicated that the as-synthesized ACs possess amorphous structure for all activation temperatures and the largest BET specific surface area (1107.5 m2/g) accompanied with the highest pore volume (0.579 cm3/g) at 800°C. The average micropore size fluctuated in the range of 5-7 A depending on the activation temperature. Therefore, the KOH-activated carbons with high porosity can offer a great adsorption capacity as promising for applications in many areas especially in removal of environmental pollutants.
Thuan Van Tran, Bich Ngoc Hoang, Hien Thien Tran, Nhan Phu Thuong Nguyen, Van Thi Thanh Ho, Nguyen Dai Hai, Vu Dai Cao, Trinh Duy Nguyen and Long Giang Bach, 2019. Activated Carbon via. Pyropysis of Tea Industry Waste Biochar with KOH Activation: Preparation and Characterization. Journal of Engineering and Applied Sciences, 14: 1755-1759.