Silica bonded calix[4]arene as an efficient, selective and reusable sorbent for rubber chemical additives

Synthesis and characterization of a new reusable calix[4]arene-bonded silica gel sorbent for antidiabetic drugs

“…Results suggest that C4BS was approximately 10 mm larger than bare silica gel, and it appears that immobilization alters the particle size to some extents. 20 The specic surface area, average pore diameter and total pore volume of bare silica gel and C4BS are 406 m 2 g À1 , 6.69 nm, 0.68 cm 3 g À1 , and 256 m 2 g À1 , 4.35 nm, and 0.28 cm 3 g À1 , respectively (Table 2). The decrease in pore diameter, pore volume and surface area of C4BS clearly supports that the immobilization has been occurred.…”

“…In other words, the hysteresis in the desorption branch clearly shows the presence of mesoporosity. 20 Fig. 8 represents the TGA thermodiagrams of silica gel, thiolated silica gel and C4BS, respectively.…”

“…18,19 In another study, a chlorosulfonyl calix[4]arene attached to silica gel was used as the sorbent of rubber chemical additive. 20 Moreover, calix[4]arene derivatives covalently attached to mesoporous silica via a diisocyanate were utilized to examine the sorption properties of some organotin compounds. 21 Based on these backgrounds, we were persuaded to design a new calix[4]arene-bonded silica gel, with tendency to selectively bind to DAPA, EMPA and LINA, and thus to be used for separation of such drugs from pharmaceutical effluents.…”

Recent progress to construct calixarene-based polymers using covalent bonds: synthesis and applications

“…Scheme 37 illustrates the synthetic strategy for silica bonded calix [4]arene 126. 102,103 A top priority of enzyme technology is to improve the conformational stability of the enzyme. Erdemir et al examined new calix[n]arene-based silica polymers to immobilize candida rugosa lipase (Scheme 38).…”

Application of Silica Supported Calix[4]arene Derivative as Anti-reversion Agent in Tire Tread Formulation

“…Calixarenes and their derivatives have many applications in membrane electrodes, construction of polyurethane foams and composites, remove ions, sensors, catalyst, adsorption, binders, detection and extraction. [15][16][17][18][19][20][21] In rubber industry, they used as filler, 22 coupling agent, 23 tackifier resin, 24 adsorbent of CBS, DPG 25 and antioxidant. 26 Prevent the reversion phenomenon using anti-reversion agents has been investigated by different researchers, while the possible influence of calixarenes as anti-reversion element have not been properly studied in the existing literature.…”