| Summary: | The widespread water pollution issues are becoming the major water threat
in Malaysia. The ability of agricultural by-products to remove contaminants from
water was investigated and reviewed in this study. Coffee waste, rice husk and mango
leaves were utilized in the uptake of Cu(II) in batch experiments. The effect of pH,
contact time and initial copper concentration were studied. Equilibrium data were
fitted into Langmuir and Freundlich isotherm models. The data was fitted better in
Langmuir isotherm with correlation coefficient of 0.8991, 0.9949 and 0.9918. The
maximum adsorption capacity was 15.24, 12.30 and 15.77 mg/g on coffee waste, rice
husk and mango leaves respectively which indicated the adsorption was in monolayer
pattern. The results revealed that coffee waste, rice husk and mango leaves are capable
to remove Cu(II) when compares with other adsorbent. The study also revealed the
use of different agriculture by-products in the remediation of heavy metal and
pollutants contamination in wastewater.
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