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Volume 9
Chemical Sciences Journal
Asia Chemistry 2018
September 12-13, 2018
11
th
Annual Congress on
September 12-13, 2018 Singapore
Chemistry
Characteristics influenced by Post modification of Tea waste biochars pyrolyzed at different
temperatures
Oshani Nayanathara
1
, Sameera R Gunatilake
1
, Chathuri Peiris
1, 2
, Priyani A Paranagama
1, 3
, Meththika Vithanage
3, 5
, M N Kaumal
4
and Todd Mlsna
6
1
Institute of Chemistry Ceylon, Sri Lanka
2
University of Colombo, Sri Lanka
3
University of Kelaniya, Sri Lanka
4
National Institute of Fundamental Studies, Sri Lanka
5
University of Sri Jayewardenepura, Sri Lanka
6
Mississippi State University, USA
B
iochar (BC) is a low cost adsorbent produced by the pyrolysis of biomass which can be used for water remediation and soil
amendment purposes. Tea waste is an excellent biomass for BC production since it is an abundant solid waste in Sri Lanka. A
systematic comparison was carried out to evaluate the characteristics influenced by post modification of tea waste BC pyrolyzed
at 300, 500 and 700 ºC. According to FTIR spectra, BC produced at Low Temperatures (LTBC) contained high content of oxygen
containing Surface Functional Groups (SFGs) in comparison with BC produced at High Temperatures (HTBC). Peaks observed
mainly at 3300-3400, 1650-1700 and 1350-1450 cm-1. In order to enhance adsorption characteristics, three post modification
methods have been carried out using hydrochloric, sulfuric and nitric acids. Surface acidities of BC were determined by Boehm
titration method. All three BC contained a significantly high amount of Phenolic functional groups than lactonic and carboxylic
SFGs. Nitric acid modification considerably increased the carboxylic acid content while the total acidic FG content was increased
by acid modifications. Surface Morphology of BC was evaluated by SEM imaging. An increment of Cation Exchange Capacity
(CEC) was observed at elevated pH and highest CEC was obtained by nitric acid modified BC when comparing with hydrochloric
and sulfuric acid treatments.The pHat the point of zero charge of non-modified BCwas ranged from6.3-7.5 whichwere decreased
upon acid treatment up to 2.6. The produced BC contained 6.75-11.40% ash content whereas the moisture content varied from
6.33-9.70%.
onayanathara@gmail.comChem Sci J 2018, Volume 9
DOI: 10.4172/2150-3494-C5-030