New amino-functionalized 1,3-alternate calix[4]arene bis- and mono-(benzo-crown-6 ethers) for pH-switched cesium nitrate extraction

Use of surfactants for the remediation of contaminated soils: A review

“…Considering the above features of macrocyclic compounds, researchers introduce hydrophobic groups (e. g. alkyl and phenyl) into the rings of annular polyoxyethylene, or link calixarene to hydrophilic poly(oxyethylene) and polyether [73], to obtain a group of macrocyclic compounds-based surfactants, which have better washing performances on radionuclides contaminated soils and radioactive waste. Bonnesen et al [74,75] found that calixcrown ether (BOBCalixC6, see Scheme 1a) had a good performance for the extraction of radioactive cesium compounds. Boda et al [76] further confirmed the superior selectivity of macrocyclic hybrid calixcrown ether toward Cs + by a density functional theory (DFT) calculation.…”

“…Innovations on surfactant chemistry, biotechnology and remedial engineering technology are necessary to spur the application of biosurfactants and other surfactant-based techniques in the future.AcknowledgementThe authors thank the financial support from national Natural Science Foundation of China (grant No 51108353), from the interdisciplinary research project of Wuhan University (2042014Kf0275). The authors appreciated Miss Tiantian Liu from the Central China Normal University for her work on Molecule structure of (a) BOBCalixC6[74,75] and (b) DTBCH18C6[77].…”

1,3-Alternate, the Smart Conformation of Calix[4]arenes

“…Conducting polythiophenes generated form thiophenyl derivatives 14j and 14k of 1,3-alternate calix [4]crowns have been shown to be selective electrochemical sensors for various alkali metal ions depending on the crown size [46]. The selectivity coefficients of both the mono-benzocrowns 15a-f [55][56][57][58] and the dibenzocrowns 16a,b [59,60] are higher than those of analogous simple calix [4]arene-crown-6 ligands, though a crystal structure determination indicates that this is not to be associated with any cation-interactions involving the benzo units [59]. The selectivity coefficients of both the mono-benzocrowns 15a-f [55][56][57][58] and the dibenzocrowns 16a,b [59,60] are higher than those of analogous simple calix [4]arene-crown-6 ligands, though a crystal structure determination indicates that this is not to be associated with any cation-interactions involving the benzo units [59].…”

Multi-staging for extraction of cesium from nitric acid by a single liquid–liquid countercurrent centrifugal extractor with Taylor vortices

“…For the selective separation of Cs from both acidic and alkaline solutions by liquid-liquid extraction, BOBCalixC6 and its derivatives have been extensively studied as appropriate extractants owing to their excellent extraction ability and selectivity for Cs ions, and they are resistant against acidic, alkaline and radiation conditions [22][23][24][25]. Also, many works related to the extractants have been studied [26][27][28][29], and Cs-7SB was introduced to avoid the formation of a third phase [30,31] and trioctylamine was added for effective back extraction [32]. Before the continuous extraction of Cs was performed using the centrifugal extractor, batch extraction tests were conducted for selecting suitable solution conditions ( Table 2).…”