The recovery of indium from impregnating resins in water is usually limited by the poor bonding of the extractant to the carrier resin. Pickering emulsion hydrogels (PEHGs) encapsulating extractant bis(2-ethylhexyl) phosphate are prepared by oil-in-water Pickering emulsions polymerization method using polyvinyl alcohol and sodium alginate as continuous phases and nano-SiO 2 and alkylphenol ethoxylates-10 (OP-10) as emulsifiers. PEHGs are used to recover trivalent In(III) from water to study its encapsulation and adsorption properties. Pickering emulsions are characterized by optical microscopy. PEHGs are characterized by Fourier transform infrared spectrometer and scanning electron microscopy. The results showed that the stabilization time of Pickering emulsions improved from 3 min to ≈14 days after the addition of 5 wt.% of OP-10. The internal structure of 4-Pickering emulsion hydrogels (4-PEHGs) prepared from Pickering emulsions co-stabilized by nano-SiO 2 and OP-10 is changed from core-shell to honeycomb structure and no oil phase leakage occurred. In(III) adsorption is carried out on 4-PEHGs. The results showed that the maximum adsorption of In(III) in water by 4-PEHGs is 18.03 mg g −1 . The adsorption process of In(III) is controlled by chemisorption. This study showed that 4-PEHGs can be used as an effective adsorbent for the recovery of indium in water.
For improving the compatibility of oil‐based flame retardants and waterborne substrates, Bisphenol A‐bis(diphenyl phosphate) (BDP) is used as the dispersed phase, sodium alginate (SA) solution as the continuous phase, and hydrophilic silica as the emulsifier in the preparation of stable oil‐in‐water (O/W) Pickering emulsions. Then, the emulsions are added into CaCl2 solution in the atomized form to polymerize the aqueous phase to calcium alginate (CA) and to obtain BDP/SiO2/CA microcapsules. BDP/SiO2/CA microcapsules are used as a flame retardant to improve the fire safety of waterborne polyacrylic acid (PAA) coatings. To verify that BDP/SiO2/CA is successfully prepared, Fourier‐transform infrared spectra (FTIR) and scanning electron microscopy (SEM) are used after microencapsulation. The results show that the physical barrier formed by the SiO2 particle layer has successfully stabilized the BDP in the CA gel network. Subsequently, the flame retardance of PAA with BDP/SiO2/CA is tested using limiting oxygen index (LOI) test and cone calorimeter(CONE) test. Compared with pure PAA, when BDP/SiO2/CA (4:6) microcapsules are added at 20 wt %, the LOI of the PAA coating is increased from 18.6% to 28.4%, the peak heat release rate (PHRR) value of that is reduced by 52.66%. The microcapsules endow oily BDP hydrophilicity and good compatibility with waterborne PAA coatings.
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