摘要
In the present study, a novel approach was used to control zero valent iron aggregation and separation problems by fixing zero valent iron （ZVI） on bentonite-fly ash pellets. For this purpose, porous low cost bentonite-fly ash （BFA） pellets with size of 2.00 cm in length and 0.35 cm in diameter were prepared and fixed with ZV1 to manufacture zero valent iron bentonite-fly ash （ZVI-BFA） pellets. Importantly, unlike powdered adsorbents, ZVI-BFA can easily be separated from final effluents when exhausted without any disintegration. The performance of the developed novel adsorbent was investigated for the removal of Pb2＋ and Cd2＋ from aqueous media. At 100 mg.L I and 1 g adsorbent, a maximum of 89.5% ofCd2＋ and 95.6% ofPb2＋ was removed by ZVI-BFA as compared to 56% and 95% removal by BFA. At 200 mg.L 10 Cd2＋ and Pb2＋ removal by ZVI-BFA was 56% and 99.8% respectively as compared to only 28% and 96% by BFA. Further, the removal kinetics was best fitted for pseudo-second order model. The study provides the basis for improving the removal capacity of porous materials by iron fixation while taking separation ability into consideration.
In the present study, a novel approach was used to control zero valent iron aggregation and separation problems by fixing zero valent iron （ZVI） on bentonite-fly ash pellets. For this purpose, porous low cost bentonite-fly ash （BFA） pellets with size of 2.00 cm in length and 0.35 cm in diameter were prepared and fixed with ZV1 to manufacture zero valent iron bentonite-fly ash （ZVI-BFA） pellets. Importantly, unlike powdered adsorbents, ZVI-BFA can easily be separated from final effluents when exhausted without any disintegration. The performance of the developed novel adsorbent was investigated for the removal of Pb2＋ and Cd2＋ from aqueous media. At 100 mg.L I and 1 g adsorbent, a maximum of 89.5% ofCd2＋ and 95.6% ofPb2＋ was removed by ZVI-BFA as compared to 56% and 95% removal by BFA. At 200 mg.L 10 Cd2＋ and Pb2＋ removal by ZVI-BFA was 56% and 99.8% respectively as compared to only 28% and 96% by BFA. Further, the removal kinetics was best fitted for pseudo-second order model. The study provides the basis for improving the removal capacity of porous materials by iron fixation while taking separation ability into consideration.
