Characterization and adsorption properties of cross-linked yeast/β-cyclodextrin polymers for Pb(ii) and Cd(ii) adsorption

Abstract

A cross-linked yeast/β-cyclodextrin polymer (Y–β-CDP) was synthesized to remove Pb(ii) and Cd(ii) from aqueous solution.

Electrochemical Asymmetric Reduction of Ketoesters Induced by β‐Cyclodextrin Modified by (1S,2S)‐(+)‐1,2‐Diaminocyclohexane

“…The unique cavity structure of β‐CD can contain guest molecules and provide a suitable microenvironment for the asymmetric reduction of guest molecules. It happens that the change of microenvironment will affect the physical and chemical properties of the reactants [13,20,21] . And through the modification of β‐CD, catalytic sites can be added on the basis of maintaining the original function of β‐CD containing the guest.…”

“…The yield increased from 35 % to 57 %, while the current density increased from 3 to 5 mA/ cm 2 . But when the current density continued to increase from 5 to 6 mA/cm 2 , the yield dropped from 57 % to 38 % ( entries 4,11,12,13). From these results, we know that too high and too low current density are not conducive to the yield of the target product.…”

“…In recent years, more and more studies have proved that βcyclodextrin (β-CD, Figure 1A) and its derivatives are effective inducers in asymmetric catalytic reactions. [13][14][15][16] β-CD is a conical enzyme-like catalyst composed of glucose units with hydroxyl groups distributed at both ends of the conical cavity. [17][18][19] The unique cavity structure of β-CD can contain guest molecules and provide a suitable microenvironment for the asymmetric reduction of guest molecules.…”

“…It happens that the change of microenvironment will affect the physical and chemical properties of the reactants. [13,20,21] And through the modification of β-CD, catalytic sites can be added on the basis of maintaining the original function of β-CD containing the guest. As an important chiral inducer of primary amines, (1S,2S)-(+)-1,2-diaminocyclohexane (S-DACH, Figure 1B) has simple skeleton structure, high reaction activity and good selectivity.…”

PAMPS-graft-Ni3Si2O5(OH)4 multiwalled nanotubes as a novel nano-sorbent for the effective removal of Pb(ii) ions

“…[12][13][14] Various adsorbents, including biomass, polymers, activated carbons and minerals, have been applied to remove Pb(II) from contaminated wastewater. [14][15][16][17] Moreover, it has been observed that these adsorbents require further modications to increase the number of active binding sites and make them readily available for adsorption. 18,19 Although some of the abovementioned adsorbents are able to remove Pb(II) from contaminated wastewater, high cost is still the main concern or disadvantage of these adsorbents in practical applications.…”