A heavy metal contamination problem in Thailand is an important issue that needs to be addressed
urgently, particularly contaminated in water. Heavy metal contamination in water can spread to
other environments faster. This research aims to apply chitosan-magnetic biochar synthesized
from water hyacinth in order to solve the problem of copper and nickel contaminated in water.
Data from SEM indicated that chitosan-magnetic biochar had a smoother surface and had
smaller holes than the magnetic biochar. When tested with Autosorb-1, results indicated that the
adsorbent with chitosan had a slightly lower porosity compared to without chitosan. Data from
FTIR found evidence of chitosan on the adsorbent. According to the XRD study, peaks of iron
oxide presented. The point of zero charges (pHPZC) of chitosan-magnetic biochar was 7.03. The
adsorption isotherms, kinetics, and thermodynamics were observed. The adsorption of both Cu
and Ni followed Langmuir isotherm. The value of qmax for Cu was 38.4615 mg/g and for Ni was
0.4858 mg/g. The R2 value of Dubinin-Radushkevich isotherm was also high. The E value of Cu
and Ni was 0.316 kJ/mol and 1.8962 kJ/mol, respectively. The best-fitting kinetic model for Cu was
the pseudo-second-order model and for Ni was the intra-particle diffusion. The adsorption was
an endothermic process. The process was spontaneous at high temperatures and non-spontaneous
at low temperatures.
Keywords
Adsorption; Chitosan; Magnetic biochar; Metal; Wastewater
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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