title: Development of coconut pith chars towards high elemental mercury adsorption performance - Effect of pyrolysis temperatures.
abstract: In this study, chars from coconut pith (CP) were prepared aiming for superior adsorption towards elemental mercury (Hg(o)). The yield, proximate analysis, textural characteristics, surface functional groups and elemental composition analyses of the chars produced at pyrolysis temperature of 300 °C, 500 °C, 700 °C and 900 °C were compared. The surface area, pore volume, ash and carbon content of chars increased, while the yield and moisture content decreased with increasing pyrolysis temperatures. The changing of physical and chemical properties of the chars produced at variety pyrolysis temperature was much effect on the Hg(o) adsorption performance and definitely provides important information on the Hg(o) adsorption mechanism. The highest Hg(o) adsorption capacity was observed for CP900 (6067.49 μg/g), followed by CP700 (2395.98 μg/g), CP500 (289.76 μg/g), CP300 (1.68 μg/g), and CP (0.73 μg/g). The equilibrium data were well described by the Freundlich adsorption isotherm model. The pseudo-second order best described the kinetic data of the Hg(o) adsorption onto CP and CP300. For chars produced at higher pyrolysis temperature, however, the pseudo-zero order and pseudo-second order fitted well for the adsorption and breakthrough regions, respectively. The Hg(o) adsorption capacity of chars obtained from high pyrolysis temperature of CP significantly outperformed the commercial activated carbon (Darco KB-B) as well as superior to chars reported in the literature indicating the CP can be used as a precursor for preparation of chars as elemental mercury adsorbents.
authors.affiliation: Department of Chemical Engineering, Universiti Teknologi PETRONAS, 32610, Bandar Seri Iskandar, Perak, Malaysia.
authors.forename: Khairiraihanna
authors.initials: K
authors.lastname: Johari
authors.affiliation: Advanced Materials and Process Engineering Laboratory, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310, UTM Skudai, Johor, Malaysia.
authors.forename: Norasikin
authors.initials: N
authors.lastname: Saman
authors.affiliation: Advanced Materials and Process Engineering Laboratory, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310, UTM Skudai, Johor, Malaysia.
authors.forename: Shiow Tien
authors.initials: ST
authors.lastname: Song
authors.affiliation: Advanced Materials and Process Engineering Laboratory, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310, UTM Skudai, Johor, Malaysia.
authors.forename: Siew Chin
authors.initials: SC
authors.lastname: Cheu
authors.affiliation: Advanced Materials and Process Engineering Laboratory, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310, UTM Skudai, Johor, Malaysia.
authors.forename: Helen
authors.initials: H
authors.lastname: Kong
authors.affiliation: Advanced Materials and Process Engineering Laboratory, Faculty of Chemical and Energy Engineering, Universiti Teknologi Malaysia, 81310, UTM Skudai, Johor, Malaysia; Advanced Materials and Separation Technologies (AMSET) Research Group, Health and Wellness Research Alliance, Universiti Teknologi Malaysia, 81310, UTM Skudai, Johor, Malaysia. Electronic address: hbmat@cheme.utm.my.
authors.forename: Hanapi
authors.initials: H
authors.lastname: Mat
mesh_terms: D000327:Adsorption; D000393:Air Pollutants / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry*; D003059:Cocos; D006358:Hot Temperature; D007700:Kinetics; D008628:Mercury / Q000737:chemistry*; D018547:Plant Stems
chemical_list: D000393:Air Pollutants; C540010:biochar; D002606:Charcoal; D008628:Mercury
keywords: Adsorption; Chars; Coconut pith; Elemental mercury; Pyrolysis