Invited Speaker

Dr. Collin G. Joseph

Dr. Collin G. Joseph

Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Malaysia
Speech Title: Preparation and Characterization of Activated Carbon from Coffee Waste for the Removal of 2,4-Dichlorophenol in Aqueous Medium

Abstract: Activated carbon was prepared from coffee waste via two-stage self-generated atmosphere using zinc chloride (ZnCl2) activation. The effect of impregnation ratio (IR) on the physicochemical properties and adsorption capacity for 2,4-dichlorophenol (2,4-DCP) was studied. The prepared activated carbons underwent characterization such as the percentage of yield, moisture and ash contents, pH, surface chemistry studies, and morphological studies. An increase in IR was inversely proportional to the percentage of yield for the prepared activated carbon. Activated carbon which produced with the IR of 4:1 (AC4) had the highest adsorption capacity for 2,4-DCP, 21.72 mgg-1. The effects of different experimental parameters such as initial concentration, adsorbent dosage, and solution pH were investigated. The adsorption was more favourable in acidic pH as compared to alkaline pH while pseudo-second-order kinetic model best described the sorption kinetic of 2,4-DCP. The data proved that 2,4-DCP adsorption by AC4 was a chemisorption process as corroborated with the Langmuir isotherm model.

Keywords: Activated carbon, coffee waste, adsorption kinetics, 2,4-dichlorophenol

Biography: Collin G. Joseph is a Professional Chemist and an Associate Professor in the Industrial Chemistry Program of Universiti Malaysia Sabah, which he joined as an academician in 2003. He obtained his PhD in Chemical Engineering from the University of Nottingham, UK in 2011 and to-date he has received several Excellence and Service awards as well as research and innovation Gold Medals in MTE, ITEX and PEREKA research competitions. He is an accomplished researcher and author in the field of Adsorbent Technology, Sonophotochemistry and Ozone Chemistry research. Since 2020, he has been serving as the Head of the Industrial Chemistry Programme at the Faculty of Science and Natural Resources, Universiti Malaysia Sabah. Due to his outstanding accomplishments in the field of Chemistry, he has been invited by many Tier 1 journals to serve as a reviewer under various publishers such as Elsevier B.V, Springer and Taylor & Francis. He sits on the Editorial board of the Malaysian Journal of Chemistry (ISSN: 2550-1658), as a Review Editor on the Editorial Board of Photocatalysis (Frontiers of Chemistry (ISSN: 2296-2646)) and serves as a Guest Editor for Catalysts (ISSN 2073-4344). He is an active member (Fellow) of the Malaysian Institute of Chemistry and American Chemical Society. He also serves as a volunteer (Life-time member) with MERCY Malaysia and the UMS4WDVC, carrying out various community-based activities in Sabah, Malaysia.