Functionalised poplar catkins aerogels: Synthesis, characterisation and application to adsorb Cu(II) and Pb(II) from wastewater

A novel ion-responsive photonic hydrogel sensor for portable visual detection and timely removal of lead ions in water

“…We also summarized the Pb 2+ detection or adsorption performance achieved by some other materials reported recently, and compared their sensitivity, selectivity, and adsorption performance (Table 2). 6,7,9,10,12,18,35,44,46,60,62 Although few materials or devices show higher detection or adsorption capacities toward Pb 2+ than our developed PNBC hydrogel, they cannot simultaneously colorimetrically detect and remove Pb 2+ in water. This hampers their wide applications to some extent.…”

“…Slight protonation of the B18C6Am groups at a low solution pH reduce the complexing ability to Pb 2+ . Upon raising the solution pH from 2 to 5.5, the B18C6Am ligands gradually deprotonate, thus increasing the effective complex sites, 12,60 which makes the 18crown-6 units bind more Pb 2+ in solution, eventually resulting in remarkable redshifts in the structural colors of the hydrogel. However, the diffraction wavelength is blueshifted as the solution pH is increased from 5.5 to 7.…”

“…So far, various functional materials or devices, such as fluorescent probes, DNAzymes, nanogels, diffraction gratings, aerogels, and clay materials, have been developed for real-time detection or elimination of Pb 2+ in water. [6][7][8][9][10][11][12][13] For example, Sharma et al designed a sensitive fluorescent probe based on functionalized molybdenum disulfide (MoS 2 ) quantum dots for Pb 2+ monitoring with a detection limit of 50 mM. 6 Fu et al developed a label-free DNAzyme biosensor for amplified ''turnon'' fluorescence sensing of Pb 2+ with a detection limit of 3 nM.…”

“…11 Bai et al reported the adsorption of copper ions (Cu 2+ ) and Pb 2+ from wastewater using an aerogel formed from functionalized poplar catkins. 12 Chen et al studied the removal of Pb 2+ from aqueous solutions using both modified and unmodified kaolinite clays. 13 Although these materials or devices show reasonable detection or adsorption performances toward Pb 2+ , there have been few reports on the simultaneous portable, naked-eye visual detection and timely removal of Pb 2+ in water.…”

A Highly Expanded Polycarboxylate Gel and New Environmental Response Effects for Efficiently Adsorbing and Recovering Cu(II) from Water

“…Heavy-metal wastewater has caused serious environmental pollution and public health concerns, destroying the global sustainable development. − The copper of Cu­(II) is considered to be one of the most common heavy-metal pollutants in wastewater from many industries, such as printed circuit, paint, copper polishing, electroplating, mining, smelting, petroleum refining, metal cleaning, fertilizer, and battery − The discharge of Cu­(II)-containing wastewater will cause damage to the liver and heart and even lead to cancer, besides the serious pollution to the water environment. The World Health Organization (WHO) and the United State Environmental Protection Agency (USEPA) have ruled that the concentration of copper in drinking water should not exceed 1.5 and 1.3 mg/L, respectively .…”