Abstract
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.
Highlights
Today, the emission of heavy metals into the aquatic and marine water systems has attracted increasing concerns, because these emissions create environmental issues that are associated with human health
polyvinylidene fluoride (PVDF) was purchased from Shanghai San Aifu New Chemical Materials Co. (Shanghai, China), N,N-dimethyl acetamide (DMAc) was obtained from Beijing Yili fine chemicals Co. (Beijing, China), 2-aminobenzothiazole and 1,5-diphenylcarbazide (DPCI) were obtained from Shanghai JingChun biological technology Co., Ltd. (Shanghai, China), Tween 80 was purchased from Sinopharm Chemical
Effect of 2-Aminobenzothiazole Dosage on Membrane Performance dosage ofAs2-aminobenzothiazole into the blend membrane
Summary
The emission of heavy metals into the aquatic and marine water systems has attracted increasing concerns, because these emissions create environmental issues that are associated with human health. With rapid development of society and economy, large quantities of wastewater containing heavy metals are generated from industries, including textiles, leather tanning, electroplating, steel making, metal finishing, pigment manufacture, wood preservatives, as well as in mine tailings [1,2]. The methods of dealing with wastewater containing chromium include chemical reduction precipitation [3], electrolytic process [4], biological method [5], adsorption method [6], and ion exchange. All of the above methods have disadvantages to a certain degree, such as high costs, use of toxic compounds, large space requirements for installation, generation of secondary pollutants, and others. A number of technologies have been introduced to deal with Cr(VI) in water, such as adsorption, chemical precipitation, ion-exchange, nanofiltration, and ecological remediation [8,9,10,11]
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