猪粪活化成能去除Cr(VI)的低成本活性炭

L. Gonsalvesh, G. Gryglewicz, R. Carleer, J. Yperman
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引用次数: 4

摘要

研究了猪粪样品,即脱水饼(SMc)和固体消化液(SMd)在具有有益价值的产品,即低成本活性炭(ACs)中的增值作用。为此目的,在三种不同的持续时间下应用缓慢热解和蒸汽活化。此外,所获得的ac进行了表征和测试,以去除水溶液中的Cr(VI)。结果表明,SMc制得的ACs的BET表面积在236 ~ 267 m2 /g之间,SMd制得的ACs的BET表面积在411432 m2 /g之间。尽管制备的活性炭的确定表面积低,但通过“耦合吸附-还原”机制观察到高的总Cr去除能力。具有更高表面积的活性炭(根据Langmuir模型,qm为140.9 mg/g)具有更高的Cr(VI)去除能力。Cr(VI)的去除率与pH值有关,在pH值为1时达到最大值。然而,在该pH下,大量的Cr以Cr(III)的形式留在溶液中。在pH值为2时,较少量的Cr(VI)被较高的Cr(III)去除所补偿,从而产生较高的吸附crot量。因此,在pH 2下吸附是合适的。活性炭对Cr(VI)的去除能力几乎与活化时间无关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Valorization of swine manure into low cost activated carbons capable of Cr(VI) removal
The valorization of swine manure samples, i.e., de-watered cake (SMc) and solid digestate (SMd), in products with beneficial value, i.e., low cost activated carbons (ACs), is studied. For this purpose slow pyrolysis and steam activation at three different duration times are applied. Additionally, the obtained ACs are characterized and tested towards removal of Cr(VI) from aqueous solutions. It is revealed that BET surface area varies in the range of 236-267 m 2 /g for ACs prepared from SMc sample and in the range of 411432 m 2 /g for ACs prepared from SMd sample. Despite the low determined surface area of prepared ACs, a high total Cr removal capacity is observed occurring through a “coupled adsorption-reduction” mechanism. Higher Cr(VI) removal capacity is demonstrated for ACs having higher surface area (qm is 140.9 mg/g according Langmuir modelling). Cr(VI) removal is found to be pH dependent with a maximum at pH 1. However at that pH significant amounts of Cr remain in the solution as Cr(III). At pH 2 lower amount of Cr(VI) is removed compensated by a higher removal of Cr(III) resulting in a higher amount of adsorbed Crtot. Therefore adsorption at pH 2 is found to be appropriate. The removal capacity of the studied ACs towards Cr(VI) is almost independent of activation time.
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