Heavy metal polluted water threatens the integrity of ecosystem. The use of agricultural waste as adsorbent becomes popular due to its biodegradability and availability. However, limited research works has been done to process agricultural waste for heavy metal adsorption purpose. The objective of this study is to propose a new approach to treat banana peel using ZnCl2 prior to alkali and acid treatment and explore the potential of dragon fruit peels as the adsorbent for Cu2+ adsorption. Seven adsorption isotherm was adopted to identify the adsorption mechanism and four statistical parameters were calculated for model verification purpose. The experiment was conducted by dispersing ZnCl2 treated and untreated adsorbents into Cu2+solution. Results showed that ZnCl2 treated adsorbents performed better in terms of Cu2+ removal compared with untreated adsorbents due to higher surface area for Cu2+ adsorption. The treated banana peel ( Act.-B) performed approximately 30％ better than the treated dragon fruit peel ( Act.-D ) due to the presence of hydroxyl and carboxyl groups. The equilibrium adsorptive capacity of Act.-B was 1872.8 mg Cu2+/g and the experimental data fitted Freundlich isotherm well with R2= 0.9978, 0.0161 of residual sum of error ( SSE) , 0.0068 of χ2 , and 0.0567 of root mean square error ( RMSE) values. This suggests non-linear adsorption and multi-layer adsorption on heterogenous surfaces. Thus, it is recommended to further improve the surface properties of Act.-B by steam pyrolysis and surface modification.

Centre for Water Research,Faculty of Engineering,Built Environment and Information Technology,SEGi University Sdn Bhd,Petaling Jaya 47810,Selangor,Malaysia

[1]S.Y.Tai;L.L.Fong;M.K.Chan;P.K.Bullar-.Adsorption Isotherm Study of Activated Fruit Peels for Copper Removal)[J].哈尔滨工业大学学报（英文版）,2022(03):93-100

Isotherm,Peels,Cu2+solution

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