Hexavalent chromium is one of the main heavy metal pollutants. As the environmental legislation becomes increasingly strict, seeking new technology to treat wastewater containing hexavalent chromium is becoming more and more important. In this research, a novel modified ultrafiltration membrane that could be applied to adsorb and purify water containing hexavalent chromium, was prepared by polyvinylidene fluoride (PVDF) blending with 2-aminobenzothiazole via phase inversion. The membrane performance was characterized by evaluation of the instrument of membrane performance, infrared spectroscopy (FTIR), scanning electron microscope (SEM), and water contact angle measurements. The results showed that the pure water flux of the PVDF/2-aminobenzothiazole modified ultrafiltration membrane was 231.27 L/m2·h, the contact angle was 76.1°, and the adsorption capacity of chromium ion was 157.75 µg/cm2. The PVDF/2-aminobenzothiazole modified ultrafiltration membrane presented better adsorption abilities for chromium ion than that of the traditional PVDF membrane.
A simple self-sacrificed template method was used to prepare a polypyrrole (PPy) nanotubes sensor for the detection of ammonia (NH 3). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyse the morphology of the fabricated membrane. The results show that pyrrole was uniformly polymerised around the sodium vanadate (Na 5 V 12 O 32) nanowires, and the Na 5 V 12 O 32 nanowires along with Ti foil were subsequently dissolved thoroughly with citric acid (0.5 M) and hydrofluoric acid (10%, v/v) to obtain a freestanding flexible PPy nanotube membrane. The resulting PPy membrane was sensitive to NH 3 and exhibited rapid and reproducible response at room temperature.
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