ABSTRACT

This work evaluates the performance of activated carbon obtained from sugarcane straw (SCAC) as an adsorbent for polyaromatic hydrocarbons (PAHs) present in model wastewater. Two commercial samples of activated carbons with different textural properties were also studied for comparison. The activated carbon prepared from sugarcane straw presents a well-developed porosity with a high surface area, which was comparable to that of one of the commercial samples studied. For all the studied carbons, adsorption followed pseudo-second-order kinetics, and the higher rate constants were found for the SCAC sample for the four PAHs. Sips and Hill isotherms best fitted the adsorption equilibrium data of the PAHs on all activated carbons investigated. The activated carbon obtained from sugarcane straw (SCAC) presented a higher adsorption capacity (2.08 mmol g⁻¹ for naphthalene, 1.26 mmol g⁻¹ for fluorene, 1.14 mmol g⁻¹ for phenanthrene, and 0.98 mmol g⁻¹ for fluoranthene) when compared to the commercial carbon samples studied in this work as well as for those related in the literature. It confirms that its use of SCAC as an adsorbent for PAHs is a promising application for the valorization of this biomass waste.

摘要

这项工作评估了从甘蔗秸秆 ( SCAC ) 中获得的活性炭作为模型废水中存在的多环芳烃 (PAH) 的吸附剂的性能。还研究了两种具有不同质地特性的商业活性炭样品以进行比较。由甘蔗秸秆制备的活性炭具有发达的孔隙率和高表面积，可与所研究的商业样品之一相媲美。对于所有研究的碳，吸附遵循准二级动力学，并且发现SCAC的速率常数更高四种 PAH 的样品。Sips 和 Hill 等温线最适合所有研究的活性炭上 PAHs 的吸附平衡数据。从甘蔗秸秆（SCAC）中获得的活性炭具有更高的吸附容量（萘为2.08 mmol g ^-1，芴为 1.26 mmol g -1 ，菲为 1.14 mmol g ^-1，荧蒽为 0.98 mmol ^g -1 ^）与本工作中研究的商业碳样品以及文献中相关的碳样品相比。它证实了它使用SCAC作为 PAHs 的吸附剂是一种很有前景的应用，可以用于这种生物质废物的增值。