TY  - JOUR
T1  - Cr(VI) Removal by a New Biocarbon Material Prepared from Local S. <I>Thaipingensis</I>
(&#145;Pokok Gapis&#146;) Leaf Biomass: Characterization, Isotherm and Kinetic Studies
AU - Sannasi Abdullah, Palsan AU - Najua Md Hafiz, Nuramira AU - Chau Hui Foong, Jenny 
JO  - Journal of Engineering and Applied Sciences
VL  - 12
IS  - 9
SP  - 2449
EP  - 2460
PY  - 2017
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2017.2449.2460
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2017.2449.2460
KW  - water pollution
KW  -Adsorption
KW  -biocarbon
KW  -carbonization
KW  -heat treated
KW  -heavy metals
AB  - This study reports the preparation of a new biocarbon material from the leaf biomass of local
S. thaipingensis tree by heat treatment for use as low cost bioadsorbent material for Cr(VI) removal. To the best
of our knowledge there is no literature to date on the exploitation of this species for similar purpose. The newly
prepared biocarbon had higher carbon (58.35%) and lower ash (5.98%) content than its precursor. Batch
sorption experiment was carried out at varying contact time (30-300 min), biocarbon dosage (0.125-0.500 g),
initial pH(2-8) and Cr(VI) concentrations (10-100 mg/L) to ascertain Cr(VI) removal capability. Results showed
that 0.125 g of biocarbon material was able to remove Cr(VI) as much as 72.72&plusmn;0.27 to 98.81&plusmn;0.82% at
10-100 mg/L, pH 2 and 180 min of agitation time (p<0.05). Adsorption followed the Freundlich model (K<sub>f</sub> = 4.80, n = 2.85, R<sup>2</sup> = 0.9963) and pseudo-second order kinetics (R<sup>2</sup> = 0.9946) implying a multilayer surface chemisorption
accompanied by interactions between the adsorbed Cr on the biocarbon surface and Cr ions in the solution.
SEM examination revealed pore like structures that can adsorb Cr in the biocarbon and the rich and
diverse chemical functional groups (-C-H-, -C-C-, -C = C-, -C-N-, -N-H-) and oxides (Ca, Na, Si) that
can facilitate adsorption were observed through FTIR and XRF analyses. This study affirms the suitability of
S. thaipingensis leaf powder biomass as a biocarbon precursor for use as low cost bioadsorbent material for
waste effluent remediation.
ER  -