Luo X.,Key Laboratory of Jiangxi Province for Ecological Diagnosis |
Luo X.,Nanchang Hangkong University |
Dong R.,Key Laboratory of Jiangxi Province for Ecological Diagnosis |
Dong R.,Nanchang Hangkong University |
And 8 more authors.
Journal of Applied Polymer Science | Year: 2013
Water-compatible molecularly imprinted polymers (MIPs) for caffeine were synthesized in aqueous medium with a new functional monomer, 1-(α-methyl acrylate)-3-methylimidazolium bromide (1-MA-3MI-Br), which had π-π and hydrogen-bonding interactions. Caffeine-imprinted polymers were prepared in suspension polymerization with 1-MA-3MI-Br and methacrylic acid (MAA), which only had hydrogen bonding, as a functional monomer. For the specific binding characteristics of the new functional monomer 1-MA-3MI-Br, the adsorption capacity and relative separation factor (β) of MIPs for caffeine were significantly enhanced. The maximum adsorption capacities of 1-MA-3MI-Br-MIP and MAA-MIP imprinted microspheres for caffeine were 53.80 and 28.90 μmol/g, respectively. Moreover, the relative separation factors were measured by comparison of the separation characteristics under competitive adsorption conditions. The results showed that the β of MAA-MIP for caffeine relative to theophylline was only 1.65; this showed a very poor recognition selectivity for caffeine, but β of 1-MA-3MI-Br-MIP for caffeine with respect to theophylline was remarkably enhanced to 3.19; this showed an excellent recognition selectivity and binding affinity toward caffeine molecules in an aqueous environment. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 Copyright © 2012 Wiley Periodicals, Inc.
Luo S.,Hunan University |
Luo S.,Key Laboratory of Jiangxi Province for Ecological Diagnosis |
Xiao X.,Hunan University |
Xi Q.,Hunan University |
And 6 more authors.
Journal of Hazardous Materials | Year: 2011
Bioremediations of cadmium by endophytic bacterium (EB) L14 (Bacillus sp.) in the presence of industrially used metabolic inhibitors (DCC or DNP) were investigated. In the presence of DCC or DNP, the biomass population of EB L14 was greatly inhibited. However, the cadmium removal of EB L14 increased from 73.6% (in the absence of DCC or DNP) to 93.7% and 80.8%, respectively. The analysis of total and intracellular cadmium concentrations during 24. h of incubation indicated that this enhanced cadmium removal was the inhibition effect of DCC or DNP on the cations export resistance system of EB L14. This unique property strongly indicated the superiority of this endophyte for practical application in cadmium bioremediation in the presence of industrially used metabolic inhibitors. © 2011 Elsevier B.V.