Zejun Zhang,Xuening Feng,Guanxin Zeng,Huanyu Liu,Liwei Shen,Ying Yang,Huaikui Yuan,Xuemin Yan,Yuanzhu Mi
Hyperbranched poly(amido amine) demulsifiers (PNDA-1 or PNDA-2) were synthesized with 1,5-diaminonaphthalene or 1,8-diaminonaphthalene as the central core by an improved “one-pot” method. Fourier transform infrared spectroscopy, nuclear magnetic resonance hydrogen spectra, and thermogravimetric analysis were utilized to explore their structure and thermal stability. It indicated that the two hyperbranched demulsifiers had good thermal stability. To evaluate their demulsification performance, some important factors such as concentration of the demulsifier, types of emulsion, temperature, and settling time were systematically investigated. When 80 mg/L of PNDA-1 or PNDA-2 was used in oily wastewater (O/W emulsion) at room temperature for 4 h, the light transmittance of the separated water reached 73.7 and 59.3%, respectively. The corresponding oil removal rate reached as high as 99.62 and 99.50%, respectively. After demulsifying with the concentration of 80 mg/L at 70 °C for 120 min, the demulsification efficiency (DE) of PNDA-1 and PNDA-2 in the crude oil emulsion (W/O emulsion) reached 92 and 83%, respectively. The DE of PNDA-1 is obviously better than that of PNDA-2 in both O/W and W/O emulsions. The possible demulsification mechanism was discussed by the interfacial tension, zeta potential, and micrograph analysis. The current work provided new hyperbranched demulsifiers, and the discussion on the mechanism also provided some references for the research of a demulsifier.
Shuai Li,Dachang Liu,Yusen He,Mingxing Li,Xiaochun Yang,Yingying He,Li Zhou,Huihong Xie,Hongxia Liu
Polydiaminonaphthalene (PDAN) is an advanced conjugated polymer with a range of photothermal, chelating, and reducing properties by the virtue of electron-donating groups in its molecular chain. In this study, in situ polymerized PDAN nanoparticles were innovatively introduced into the cellulose nanofiber (CNF)/polylactide (PLA)/PDAN hybrid aerogels formed by CNF-stabilized Pickering emulsion gel, and thus created a multifunction hybrid aerogel capable of reducing silver ions during solar-driven interfacial evaporation hybrid aerogel as a solar-driven interfacial evaporator and silver nanoparticle generator. The polymerization technology of PDAN was investigated in detail to study the effect of the morphology and structure of PDAN on its photothermal and reducing properties. The optimized hybrid aerogels integrate self-floatability, high light absorption, hydrophilicity, and cycling stability, and thus achieves a satisfactory evaporation rate (1.50 kg m–2 h–1) under the irradiation of 1 sun (100 mw/cm2). This multifunction aerogel is not only capable of extracting fresh water from various raw waters but can also reduce silver ions (Ag+) in wastewater to silver nanoparticles during evaporation. More interestingly, the hybrid aerogel containing reduced silver nanoparticles exhibited an excellent antibacterial property. This multifunction green and sustainable aerogel is promising for applications in practical wastewater treatment, the reduction of silver ions, and antibacterial treatment.
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