An efficient supramolecular adsorbent for co-adsorption of dyes and metal ions from wastewater and its application in self-healing materials

Abstract

Herein, a novel type of two-component supramolecular adsorbent, 2-OA, was developed based on non-covalent interactions using tetrazolyl derivative with octadecylamine (OA) and fully characterized using a number of structural and spectral techniques. The self-assembled 2-OA gels displayed remarkable stimuli-responsiveness as well as shape-persistent and self-healing properties. In addition, it was found that the adsorbent 2-OA was able to remove dyes (10 kinds of cationic and anionic dyes) and metal ions (Cu and Fe) simultaneously from wastewater owing to synergistic electrostatic attraction, hydrogen-bonding, and hydrophobic and coordination interactions. It also exhibited excellent co-adsorption capability to dye mixtures and binary mixtures of dyes and metal ions. In particular, the dye/metal-loaded adsorbents could be obtained easily from the aqueous phase, and recycling of the adsorbents could thus be achieved. These results suggest that the supramolecular gel 2-OA not only has great potential application in wastewater treatment but also provides a strategy for the development of intriguing self-healing materials.

Environmentally Friendly Eutectogels Comprising l‐amino Acids and Deep Eutectic Solvents: Efficient Materials for Wastewater Treatment

“…[32] Our eutectogel results competitive with respect to recent systems reported in the literature also by considering Q e values. For instance, it exceeds the values obtained in the presence of the same dye with organogels [33] and metal organic frameworks [31] (1200 mg/g and 1000 mg/g, respectively), approaching the highest value so far reported for the removal of a cationic dye by a polymeric gel, 2100 mg/g. [34] This highlights the good potential of our gels for application in the treatment of wastewater.…”

Selective and Recyclable Congo Red Dye Adsorption by Spherical Fe3O4 Nanoparticles Functionalized with 1,2,4,5-Benzenetetracarboxylic Acid

“…There are many techniques for wastewater treatment, for instance, coagulation, electrocoagulation, chlorination, ozonation, flotation, chemical oxidation, filtration, membrane separation, adsorption, and ultrafiltration [10][11][12][13][14][15][16][17] . Among various reported techniques, the adsorption is the most convenient and well-established technique because of high efficiency, simplicity, and minimum energy requirement [18][19][20][21][22][23][24] .…”

Smart Adsorbents for Aquatic Environmental Remediation

“…[66] A reversible pH, temperature, and mechanical stimuliresponsive supramolecular organo-gel (2-OA) was synthesized, through non-covalent interactions between tetrazolyl derivative and octadecylamine (OA). [225] 2-OA adsorbed dyes and heavy metals ions and had self-healing properties. Upon addition of acetic acid (HOAc), this organogel turned into a suspension as primary amine units of OA got protonated by acid addition.…”