Trinh  Duy Nguyen, Thuan  Van Tran, Bich  Ngoc Hoang, Hien  Thien Tran, Nhan  Phu Thuong Nguyen, Van  Thi Thanh Ho, Nguyen  Dai Hai, Vu  Dai Cao, Long  Giang Bach, 
    Activated Carbon via. Pyropysis of Tea Industry Waste Biochar with
KOH Activation: Preparation and Characterization,
    Journal of Engineering and Applied Sciences,
    Volume 14,Issue 6,
    2019,
    Pages 1755-1759,
    ISSN 1816-949x,
    jeasci.2019.1755.1759,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2019.1755.1759)
    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 m<sup>2</sup>/g) accompanied with the highest pore volume (0.579 cm<sup>3</sup>/g) at 800&deg;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.
    Keywords: Activated carbon;tea industry waste;KOH activation;characterization;environmental;pollutants