A Smart Phase‐Selective Gelator for Recycling Aromatic Solvents, the Removal of Toxic Dyes, and Molecular Delivery

Abstract

The phase-selectiveg elation properties of al owmolecular-mass organogelator, N-(3,4,5-tributoxyphenyl)-N'-4-[(4-hydroxyphenyl)azophenyl] benzohydrazide (BNB-t4), and its applications in recycling aromatic solvents, removing toxic dyes, andm olecular delivery,a re reported. The hydroxy head group, hydrazide group, and three butyl chains in this compound provide the collective driving force for self-assembly and make BNB-t4 an excellent phase-selective gelator (PSG). FTIR and UV/Vis spectroscopy suggest that the driving forces for the gelation are hydrogen-bonding, p-p stacking and Vand er Waals interactions. The criticalg elation concentration (CGC) of BNB-t4 in aromatics olvents is very low (e.g.,0 .6 mg mL À1 in toluene), which suggests that the BNB-t4 PSG could extract aromatic solvents from aqueous mixtures. Our resultsi ndicatet hat the entangled fibrousn etwork and its rheological properties enable BNB-t4 to function as ar eversible materialf or removing toxic dyes from aqueous solution with efficiencies as high as 97 %. Furthermore, its combined phase-selectiona nd reversible phasetransition properties conferB NB-t4 the ability to absorba nd releaseo rganic compounds with efficiencies of up to 98 %. Ta ken together,t hese results demonstrate that BNB-t4c ould be used to construct smart materials for environment remediation and molecular delivery.Scheme1.Molecular structure of BNB-t4.[a] Dr. Figure 11. Absorptionspectra of water contaminated with RhB dye on alternating the temperature from 85 8CtoRTto858Cf or five cycles.

First in situ vesicular self-assembly of ‘binols’ generated by a two-component aerobic oxidation reaction

“…Thus to breakdown the gel network, greater shear strain is required at higher frequency than that of lower frequency. 47,48 Thus, both in frequency sweep as well as amplitude sweep experiments, an increase in G 0 and G 00 were observed with increase in frequency and % shear strain respectively. These results indicated the gel behavior and elastic nature of the organogels in the binary liquid mixtures studied.…”

Monopeptide-Based Powder Gelators for Instant Phase-Selective Gelation of Aprotic Aromatics and for Toxic Dye Removal

“…Adding into this growing list of recently reported yet limitedly available powder gelators, ,− in this work, we describe our systematic efforts toward the discovery of some powerful powder gelators for instant phase-selective gelation of aprotic aromatics (e.g., benzene, toluene, xylene, and nitrobenzene) at room temperature. These aromatics, which are one important source of environmental pollutions, nevertheless have remained much less studied so far, ,− especially when compared to more widely studied petroleum oils. − Additionally, we have also demonstrated their usefulness in efficiently removing highly concentrated dyes from dye-contaminated water.…”

“…This certainly enables not only near-complete elimination of toxicity caused by either oil or gelator molecules immiscible with water but also possible reclamation of treated oil. This noteworthy advantage both intrinsic and unique to PSOGs has aroused intensive interest from researchers worldwide, resulting in rapid development of diverse types of PSOGs that have now emerged as promising oil-scavenging and dye-removing materials. − …”

One-step-synthesized d-gluconic acetal-based supramolecular organogelators with effective phase-selective gelation

“…), which was benecial to the recycling of gelators and organic solvent. [5][6][7] Therefore, many scientists have been committed to nding suitable PSSGs for application research in organic solvent pollution control. [8][9][10] The current self-assembly process of PSSGs needed to be achieved by heating-cooling, ultrasonic and mechanical stirring methods.…”