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An amino-rich hollow polyphosphazene microcapsule with rigid-flexible coupling cationic skeleton (HTCM) was facilely prepared by a one-step precipitation polycondensation of hexachlorocyclotriphosphazene and tetraethylenepentamine at room temperature, which exhibited a highly efficient, rapid and selective adsorption behavior towards anionic dyes. [Display omitted] • HTCM was facilely synthesized by one-step polymerizaiton at room temperature. • HTCM owned hollow structure and rigid-flexible coupling cationic skeleton. • The average adsorption capacity of HTCM for MO reached 1009.66 mg g−1 at 25 °C. • The α values of MO for MB, CV and RhB reached 124.22, 124.87 and 136.35 respectively. • The adsorption mechanism of HTCM involved electrostatic interaction and H-bonding. An amino-rich hollow polyphosphazene microcapsule with rigid-flexible coupling cationic skeleton (HTCM) was facilely prepared by one-step polycondensation from hexachlorocyclotriphosphazene and tetraethylenepentamine. The systematic adsorption studies for six single dye systems and three binary mixed dye systems showed that HTCM possessed a highly-efficient and selective adsorption behavior towards anionic dyes from water. Especially, the adsorption capacity of HTCM towards methyl orange (MO) at equilibrium reached 1009.66 mg g−1 at 25 °C, and the relative separation factors of anionic dye MO for three cationic dyes (methylene blue, Crystal violet and Rhodamine B) was up to 124.22, 124.87 and 136.35, respectively. The adsorption rate of MO onto HTCM was very rapid, attaining 68.6 % of adsorption equilibrium capacity for MO within the first 30 min. The adsorption kinetics, isotherm and thermodynamic analysis revealed that the uptake behavior of HTCM towards MO obeyed pseudo-second-order kinetic model, intraparticle diffusion model and Langmuir model, and the uptake process was spontaneous and endothermic. As verified from FT-IR and XPS analysis for HTCM before and after MO adsorption, the adsorption mechanism of HTCM for MO involved electrostatic interaction and hydrogen bonding. The present study promises the potential of HTCM for highly selective separation of anionic dyes from wastewater. [ABSTRACT FROM AUTHOR]

We proposed a feasible strategy to prepare a rigid-flexible coupled polyphosphazene supported polyurethane foam (PUF-PCP) adsorbent by in situ polycondensation between hexachlorocyclotriphosphazene and polyethyleneimine on the surface of polyurethane foam (PUF) at room temperature. Owing to combination of the open cell porous structure of PUF support and the superior adsorption capacity of PCP coatings, the PUF-PCP composite adsorbent exhibited good adsorption behavior towards anionic dyes. Especially, the experimental adsorption capacity of PUF-PCP for methyl orange (MO) dye was up to 978.56 mg g−1 at 25 ºC. The relative separation factors of MO for methylene blue, crystal violet and rhodamine B were 224.1, 78.1 and 161.8 respectively, exhibiting an excellent adsorption selectivity of PUF-PCP towards MO. Moreover, the used PUF-PCP adsorbent can be easily collected and regenerated. The adsorption test data were best explained by Langmuir model and pseudo-second-order model. The adsorption process of MO onto PUF-PCP was spontaneous and endothermic. XPS and FT-IR analysis confirmed that electrostatic adsorption and hydrogen bonding were the plausible uptake mechanism of PUF-PCP for MO molecules. The present work demonstrated that PUF-PCP has promising potential in removing environmental anionic pollutants from waterbody. [Display omitted] • PUF-PCP was facilely fabricated by in situ polycondensation at room temperature. • The maximum adsorption capacity of PUF-PCP for MO was up to 978.56 mg g−1. • PUF-PCP can selectively adsorb anionic dyes from binary mixed dye system. • The relative separation factor of anionic MO for cationic MB was as high as 224.1. • PUF-PCP absorbent exhibited good reusability for MO removal. [ABSTRACT FROM AUTHOR]

[Display omitted] • A kind of novel polymorphic graphene-like carbon with N-doping/Ni magnetic nanohybrids were controllably prepared. • The fabricated NC@Ni nanohybrids own large specific surface area and abundant pore structure. • The NC@Ni-1 electrode exhibited an attractive specific capacitance of 590C g−1 at 1 A g−1, remarkable rate performance (74%, from 1 to 20 A g−1). • The NC@Ni-0.75 adsorbent displayed high capture capability towards MG dye and phosphate. Porous carbon with heteroatom-doping/metal nanohybrids are of specific interest for many promising applications such as supercapacitors and pollutants removal, while their controllable synthesis is still a considerable challenge. Herein, we report a kind of novel polymorphic porous carbon with N-doping/Ni magnetic nanohybrids (NC@Ni), which can be fabricated via a simple self-jet vapor-phase growth assisted strategy, and the microstructure of the NC@Ni nanohybrids can be facilely controlled through adjusting the stoichiometric ratio of the precursors nickel nitrate hexahydrate and lactose monohydrate. Characterization results show that the fabricated NC@Ni nanohybrids own large specific surface area, ultrahigh nitrogen and oxygen doping content, abundant pore structure and attractive saturation magnetization. When used as supercapacitor electrode material, the typical NC@Ni-1 electrode exhibited an attractive specific capacity of 590C g−1 at 1 A g−1, remarkable rate performance (74.5%, 1–20 A g−1), and excellent cycling stability. Meanwhile, the assembled asymmetric supercapacitor delivered an excellent energy density up to 75.1 Wh kg−1 at a power density of 1055 W kg−1. As an adsorbent, the typical product NC@Ni-0.75 displayed high capture capability towards MG dye (889 mg g−1) and phosphate (26.2 mg P g−1) at 25 OC. [ABSTRACT FROM AUTHOR]