Green and Ecofriendly Biochar Preparation from Pumpkin Peel and Its Usage as an Adsorbent for Methylene Blue Removal from Aqueous Solutions

Bal, D. V.; Özer, Çiğdem; İmamoğlu, Mustafa

doi:10.1007/s11270-021-05411-w

Cited by 15 publications

(1 citation statement)

References 57 publications

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“…For red beet peel, a pH PZC of 5.48 was obtained, indicating that at pH < 5.48, the surface of the biomass will be positively charged and the affinity with the anions will be higher [ 43 ]. Further, similar results have been reported for banana peels (pH PZC 5.63), gibto seed peel (4.3) [ 44 ], pumpkin peel biochar (5.5) [ 45 ], and groundnut husk modified with Guar Gum (7.0) [ 46 ].…”

Section: Resultssupporting

confidence: 80%

High-Efficiency Removal of Lead and Nickel Using Four Inert Dry Biomasses: Insights into the Adsorption Mechanisms

2023

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In this study, inert dry bioadsorbents prepared from corn cob residues (CCR), cocoa husk (CH), plantain peels (PP), and cassava peels (CP) were used as adsorbents of heavy metal ions (Pb2+ and Ni2+) in single-batch adsorption experiments from synthetic aqueous solutions. The physicochemical properties of the bioadsorbents and the adsorption mechanisms were evaluated using different experimental techniques. The results showed that electrostatic attraction, cation exchange, and surface complexation were the main mechanisms involved in the adsorption of metals onto the evaluated bioadsorbents. The percentage removal of Pb2+ and Ni2+ increased with higher adsorbent dosage, with Pb2+ exhibiting greater biosorption capacity than Ni2+. The bioadsorbents showed promising potential for adsorbing Pb2+ with monolayer adsorption capacities of 699.267, 568.794, 101.535, and 116.820 mg/g when using PP, CCR, CH, and CP, respectively. For Ni2+, Langmuir’s parameter had values of 10.402, 26.984, 18.883, and 21.615, respectively, for PP, CCR, CH, and CP. Kinetics data fitted by the pseudo-second-order model revealed that the adsorption rate follows this order: CH > CP > CCR > PP for Pb2+, and CH > CCR > PP > CP for Ni2+. The adsorption mechanism was found to be controlled by ion exchange and precipitation. These findings suggest that the dry raw biomasses of corn cob residues, cocoa husk, cassava, and plantain peels can effectively remove lead and nickel, but further research is needed to explore their application in industrial-scale and continuous systems.

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