Novel approach to recover copper ions using poly(ethylene imine) based layer‐by‐layer coatings on icosane particles

Abstract

The low‐density materials are developed for the wastewater treatment, the particles could be easily recovered when floating upon water surface and be recycling of a large fraction. Simultaneously, we selected the low melting point of material, which is possible to separate easily the compounds after usage. We chose icosane as a core material with layer‐by‐layer (LbL) films as an adsorbent for wastewater containing copper ions. The icosane particles were coated by poly(ethylene imine) (PEI) as positively charged layer and either poly(acrylic acid) (PAA) or poly(styrene sulfonate) as counterpart. Glutaraldehyde was introduced as a crosslinking agent to create multilayered shells with various active sites as scavenger. The copper adsorption abilities of PEI‐PAA‐coated particles were examined by inductively coupled plasma mass spectrometry. Interestingly, the adsorption amount of copper ions on PEI/PAA coated particles (16.5 mg) was optimized at 82 μg/L after 5 min of elution time, which shows a good potential of our material in the field of application. With the facile and consistent separation of the core and LbL coating, the thermal properties were revealed a stable melting temperature at around 38°C.

Novel Floating Adsorbent for Water Treatment: Organically Modified Layered Alkali Silicate by Facile Mechanochemical Reaction

“…In addition to the hydrophobic materials and/or low-density materials, surface modification has been employed to make materials float. For example, icosane (C 20 H 42 ) was modified with poly­(ethylenimine), poly­(acrylic acid), and poly­(styrenesulfonate) by a layer-by-layer assembly method to be used as a floating adsorbent for Cu 2+ removal . Vermiculite was modified with a porous carbon layer with the thickness of 2–5 μm by the impregnation of glycerol and subsequent carbonization at 600 °C under N 2 , and the products were used for oil separation and phosphate adsorption. , In these approaches, − multiple and complicated procedures were necessary to obtain floating adsorbents.…”

“…For example, icosane (C 20 H 42 ) was modified with poly­(ethylenimine), poly­(acrylic acid), and poly­(styrenesulfonate) by a layer-by-layer assembly method to be used as a floating adsorbent for Cu 2+ removal . Vermiculite was modified with a porous carbon layer with the thickness of 2–5 μm by the impregnation of glycerol and subsequent carbonization at 600 °C under N 2 , and the products were used for oil separation and phosphate adsorption. , In these approaches, − multiple and complicated procedures were necessary to obtain floating adsorbents. Furthermore, the adsorption capacity (based on the total amount of sample) was relatively low due to the presence of core–shell structures and the large proportion of components for floating rather than for adsorption.…”

Shell-Driven Localized Oxide Nanoparticles Determine the Thermal Stability of Microencapsulated Phase Change Material

“…6 Thereafter, not all encapsulation methods are universally suitable for every type of PCM. For example, while both the complex coacervation and spray-drying methods have been deemed appropriate for encapsulating PCMs for solar energy storage, 7 they may not be ideal for PCMs with low melting points, 8 sensitivity to viscosity, or a diverse particle size distribution.…”