Chang-Lian Xu , Na Ji , Xingyue Wu , Xiaoxun Xu , Guiyin Wang , Zhanbiao Yang , Zhang Cheng , Shirong Zhang , Ting Li , Pietro Paolo de Oliveira e Silva , Guochun Lv , Junzhuo Cai , Xin Qi
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引用次数: 0
Abstract
Purifying oily and Cu2+ ions-containing waste waters is still a challenge over the world. Traditional adsorption materials struggle to efficiently remove both pollutants. In this study, an underwater superoleophobic polyvinyl alcohol (PVA) and tannic acid (TA) based PVA-TA hydrogel was first prepared for the removal of both oils and Cu(II) ions. CaCO3 was subsequently incorporated to enhance the mechanical properties and Cu2+ adsorption capacities through electrostatic attractions. Both PVA-TA and PVA-TA/CaCO3 hydrogel-intermediated materials exhibited underwater superoleophobic and can be used to purify oily water, achieving separation efficiencies exceeding 99.20 % even after 60 cycles. Furthermore, these materials demonstrated excellent self-cleaning performance against viscous oil. The addition of CaCO3 can also improve the mechanical durability and chemical resistance of the PVA-TA under robbing, varying pH levels, and saline conditions. Moreover, the maximum Cu(II) adsorption capacity and removal efficiency of the PVA-TA/CaCO3 are 62.11 mg g−1 and 86.71 %, respectively; surpassing those of the PVA-TA due to increased micro-hole density and electrostatic interactions between CaCO3 and Cu(II). These porous materials can be further applied to purify real-life wastewater, indicating their potential for efficient practical wastewater treatment. This work not only provides effective porous materials for purifying oily and Cu2+-containing waste waters but also improves a simple method for preparing underwater superoleophobic hydrogel-intermediated materials.
期刊介绍:
The Journal of Environmental Chemical Engineering (JECE) serves as a platform for the dissemination of original and innovative research focusing on the advancement of environmentally-friendly, sustainable technologies. JECE emphasizes the transition towards a carbon-neutral circular economy and a self-sufficient bio-based economy. Topics covered include soil, water, wastewater, and air decontamination; pollution monitoring, prevention, and control; advanced analytics, sensors, impact and risk assessment methodologies in environmental chemical engineering; resource recovery (water, nutrients, materials, energy); industrial ecology; valorization of waste streams; waste management (including e-waste); climate-water-energy-food nexus; novel materials for environmental, chemical, and energy applications; sustainability and environmental safety; water digitalization, water data science, and machine learning; process integration and intensification; recent developments in green chemistry for synthesis, catalysis, and energy; and original research on contaminants of emerging concern, persistent chemicals, and priority substances, including microplastics, nanoplastics, nanomaterials, micropollutants, antimicrobial resistance genes, and emerging pathogens (viruses, bacteria, parasites) of environmental significance.