Polydimethylsiloxane (PDMS) membrane has attracted increasing attention due to its potential application in separating organic–organic liquid mixtures and removing volatile organic compounds from water and soil. However, solvents like n-hexane, n-heptane and others are generally used in large amounts during its traditional preparation process. This study aimed to provide a low-pollution and high-efficiency preparation method using water as a solvent in the presence of surfactant (dodecylbenzene sulfonic acid, DBSA). Comparisons between the membranes prepared separately with the traditional method and the green method were conducted by scanning electron microscopy (SEM), atomic force microscopy (AFM), attenuated total reflection Fourier transform infrared (FTIR-ATR) spectroscopy and pervaporation (PV) experiments. The results showed that they performed basically the same in the first three aspects but displayed markedly different characteristics in the PV experiments. The separation factors of the PDMS membranes prepared using the green method for separating 1.5 wt% n-butanol aqueous solution at 55 °C increased by 30–53% relative to those of membranes prepared using the traditional method, while the total flux only decreased by 7–10%. These performance improvements resulted from the shortening of evaporation time induced by the decrease of n-hexane content. Further, this hypothesis was confirmed by the performance of membranes prepared using the green method, from angles of crosslinking density, water contact angle and swelling degree (SD). Comparison with previous reports on PV performance of PDMS membranes implied that the green method was not only environment-friendly and economically competitive but also led to enhanced PV performance.

Producing furfural based on the hydrolysis of biomass rich in hemicellulose is a sustainable technique; however, separating furfural from the hydrolysate by the conventional methods like distillation is energy-intensive and environmentally unfriendly. Pervaporation, an energy-efficient ‘clean technology’, is thus suggested for the separation of furfural. A polydimethylsiloxane (PDMS) membrane was prepared using water as a solvent in the presence of a surfactant (sodium dodecyl sulfate, SDS). Effects of feed concentration and temperature, thickness of the PDMS layer and operation time on pervaporation performance were investigated, and the apparent activation energies of furfural and water permeating through the membrane were calculated according to the Arrhenius-type equation. Permeate concentration and furfural flux reached 62.4 wt% and 3222.6 g m⁻² h⁻¹ when separating 6.5 wt% furfural aqueous solution at 95 °C. Compared to distillation, pervaporation by the PDMS membrane provided higher selectivity while consuming 70% less evaporation energy. Additionally, the PDMS membrane displayed more promising potential in industrial application than those reported in the literature due to its higher furfural flux.