Murari Gabriella Frade, Penido Jussara Alves, da Silva Heriveltom Morais, Baêta Bruno Eduardo Lôbo, de Aquino Sérgio Francisco, de Lemos Leandro Rodrigues, Rodrigues Guilherme Dias, Mageste Aparecida Barbosa
Departamento de Química, ICEB, Universidade Federal de Ouro Preto, Ouro Preto, Minas Gerais, Brazil.
Departamento de Química, FACET, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Minas Gerais, Brazil.
J Environ Manage. 2017 Aug 1;198(Pt 1):43-49. doi: 10.1016/j.jenvman.2017.04.046. Epub 2017 Apr 24.
Linear alkylbenzene sulfonates (LAS) are synthetic anionic surfactants that are extensively used in many industries. As a result, large volumes of effluents containing high levels of these compounds are discharged into water bodies, causing risks to aquatic flora and fauna. Then, there is a need for environmentally safe and economically viable technologies for the removal of LAS from aqueous matrices. The present work evaluates the use of aqueous two-phase systems (ATPS) composed of PEG and sulfate salts for this purpose, considering the effects of tie line length (TLL), molar mass of polymer, and type of cation-forming salt on the partitioning behavior of LAS. All the LAS partition coefficient (K) values were greater than unity, and the LAS extraction efficiencies (%E) were higher than 97%. The system consisting of PEG 1500 + (NH)SO + HO provided the highest K (1083.34) and %E (99.9%), indicating that the method provided good extraction of LAS to the top phase. This system was applied using a real effluent sample in laboratory-scale experiments as well as in bench-scale batch trials. The results obtained at the laboratory scale showed %E values greater than 98%, while the best K value obtained in the batch experiments was 8.50 (±1.75) (%E = 78.17%). These values demonstrated the potential of ATPS for the removal of LAS from industrial effluents.
直链烷基苯磺酸盐（LAS）是一类合成阴离子表面活性剂，广泛应用于许多行业。因此，大量含有高浓度此类化合物的废水被排放到水体中，对水生动植物造成风险。于是，需要开发环境安全且经济可行的技术来从水相中去除LAS。本研究评估了由聚乙二醇（PEG）和硫酸盐组成的双水相体系（ATPS）用于此目的的效果，考察了系线长度（TLL）、聚合物摩尔质量以及形成阳离子的盐的类型对LAS分配行为的影响。所有LAS的分配系数（K）值均大于1，LAS的萃取效率（%E）高于97%。由PEG 1500 + (NH₄)₂SO₄ + H₂O组成的体系具有最高的K值（1083.34）和%E值（99.9%），表明该方法能将LAS很好地萃取到上相中。该体系在实验室规模实验以及中试规模间歇试验中应用于实际废水样品。实验室规模实验得到的%E值大于98%，而间歇实验中获得的最佳K值为8.50（±1.75）（%E = 78.17%）。这些结果证明了双水相体系用于去除工业废水中LAS的潜力。
