Rapid and selective recycling of Ag(I) from wastewater through an allylrhodanine functionalized micro-filtration membrane

作者：Yin, Xiaocui; Zhang, Qiming; Yang, Liming; Geng, Zhiwei; Luo, Xubiao^*; Ren, Wei^*

来源：Chemical Engineering Journal, 2022, 443: 136376.

DOI：10.1016/j.cej.2022.136376

• Micro-filtration membrane
• Selective filtration
• 3-allylrhodanine
• Silver ion

Balance between membrane flux and ion rejection rate of filtration membranes is an important crucial technology to achieve an efficient wastewater treatment. In this work, a polyvinylidene fluoride (PVDF) with 3-allylrhodanine (3-AR) modified composite 3-AR/PVDF membrane was fabricated by non-solvent induced phase separation method. Some parameters, such as water flux, selectivity and rejection, were investigated during the membrane treatment. Morphology characterizations, such as scanning electron microscope (SEM), nitrogen adsorption-desorption and contact angle techniques confirmed 3-AR/PVDF had hydrophilic surface and uniform porous structure with average pore size about 65.67 -39.32 nm. Surface chemical structure characterizations, such as Fourier transformed infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS) uncovered that the retention of Ag+ was mainly relied on the chemical bonding of C = S and C-S groups on 3-AR. 3-AR/PVDF-0.130 membrane exhibited excellent performance in adsorption (46.42 mg cm-2), water flux (196.04 L m-3 h-1), rejection (8.75 mg), and selectivity (beta > 10). Membrane thickness exhibited good linear relationships with water flux and interception (R2 > 0.94), which could be regulated by the thickness of membrane. The membranes maintained excellent stability in wide pH range 1 -5, and retained > 95% rejection and water flux after 6 cycles. Most important, the costs of membrane and operation were assessed during the long-term filtration, which is of significance for practical applications.

• 单位
  南昌大学; 南昌航空大学