Samal Kulbhushan, Das Chandan, Mohanty Kaustubha
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India.
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India.
J Environ Manage. 2017 Dec 1;203(Pt 1):8-16. doi: 10.1016/j.jenvman.2017.07.073. Epub 2017 Aug 1.
The potential of saponin, a biosurfactant, in the micellar enhanced ultrafiltration (MEUF) process was tested systematically for removal of methyl violet from wastewater. For this, the aqueous extract of reetha (Sapindus mukorossi) pericarp which contains saponin was used as the biosurfactant. First, the micellar solubilization of methyl violet in saponin micelles was investigated in terms of molar solubilization power (SP) of saponin. It was observed that the adsorption of methyl violet on the agglomerates of saponin micelles was mainly responsible for the enhanced solubilization. The Gibbs free energy of solubilization (calculated as -29.63 kJ mol) suggested that process was feasible and spontaneous. The MEUF experiments were performed in batch as well as continuous mode using saponin biosurfactant, and the effect of operating parameters on permeate flux and solute retention were evaluated. The removal of methyl violet in MEUF process was >99% achieved with 10 kDa polyethersulfone (PES) membrane for feed dye concentration of 250 mg L at studied conditions. Finally, the saponin in permeate was recovered using n-heptane and n-butanol by solvent extraction process. The solvent n-butanol showed better extraction efficiency as compared to n-heptane for saponin extraction.
对生物表面活性剂皂苷在胶束强化超滤（MEUF）过程中去除废水中甲基紫的潜力进行了系统测试。为此，将含有皂苷的无患子果皮水提取物用作生物表面活性剂。首先，从皂苷的摩尔增溶能力（SP）方面研究了甲基紫在皂苷胶束中的胶束增溶作用。观察到甲基紫在皂苷胶束聚集体上的吸附是增溶作用增强的主要原因。增溶的吉布斯自由能（计算值为-29.63 kJ/mol）表明该过程是可行且自发的。使用皂苷生物表面活性剂以间歇和连续模式进行了MEUF实验，并评估了操作参数对渗透通量和溶质保留率的影响。在研究条件下，对于进料染料浓度为250 mg/L的情况，使用10 kDa聚醚砜（PES）膜在MEUF过程中甲基紫的去除率>99%。最后，通过溶剂萃取法使用正庚烷和正丁醇回收渗透液中的皂苷。与正庚烷相比，正丁醇在皂苷萃取方面表现出更好的萃取效率。
