The potential to remove xylenol orange (XO) from aqueous solutions through adsorption on γ-cyclodextrin-grafted carboxymethyl cellulose (CCMC) was investigated in batch experiments. The effects of contact time, adsorption temperature and initial XO concentration were discussed. Results of batch experiments showed that CCMC exhibited some sorption capacities towards XO. It was found that isotherm fitted Languir and Freundlich models for the adsorption of XO on CCMC. On the basis of the Langmuir analysis, the maximum adsorption capacities were determined to be 29.9, 27.1, 21.9, 16.2 and 16.1 mg of XO per gram of CCMC at 283, 288, 293, 298 and 303K, respectively. The negative values of free energy change indicated the spontaneous nature of adsorption.
The interaction of the Trp-Sm(III) complex with herring sperm DNA (hs-DNA) was investigated with the use of acridine orange (AO) dye as a spectral probe for UV-vis spectrophotometry and fluorescence spectroscopy. The results showed that the both the Trp-Sm(III) complex and the AO molecule could intercalate into the double helix of the DNA. The Sm(III)-(Trp)3 complex was stabilized by intercalation into the DNA with binding constants: K(Ө)25°C = 7.14 × 10(5) L·mol(-1) and K(Ө) 37°C = 5.28 × 10(4) L·mol(-1), and it could displace the AO dye from the AO-DNA complex in a competitive reaction. Computation of the thermodynamic functions demonstrates that Δr Hm (Ө) is the primary driving power of the interaction between the Sm(III)(Trp)3 complex and the DNA. The results from Scatchard and viscometry methods suggested that the interaction mode between the Sm(III)(Trp)3 complex and the hs-DNA is groove binding and weak intercalation binding.
SiO2/TiO2 composite mesoporous materials prepared by sol-gel method with bacterial cellulose(BC)as a surface esterification agent and porous template was as photocatalyst in the degradation of methyl orange(MO)in water under UV- irradiation. The results show that the best heat treatment condition is at 600°Cfor 3 h and the optimum content of SiO2 is 30% (30 denotes the weight percent of SiO2). The photoactivity of 30SiO2/TiO2 catalyst prepared with BC was much better than that of reference catalyst prepared with no BC. An addition of BC not only raises the adsorbability of the photocatalyst, but also effectively inhibits anatase-rutile transformation and effectively induce amorphous-anatase transformation of TiO2. The BET surface area of 30%SiO2/TiO2 composite mesoporous materials was the largest. The resulting mesoporous materials showed a high photocatalytic activity for the photodegradation of methyl orange in the UV-irradiation.
The objective of this study was to convert γ-cyclodextrin to a polymer and further to investigate the potential of using the polymer for the removal of methylene blue (MB) from aqueous solution. The sorption properties of γ-cyclodextrin polymer (γ-CDP) toward MB were investigated. The effects of contact time, sorption temperature and initial MB concentration were discussed. Batch sorption studies and kinetic studies have also been performed to understand the MB extraction ability of the γ-CDP. Results of experiments showed that γ-CDP exhibited some sorption capacities toward MB. It was found that kinetics followed Ho and McKay equation and isotherm fitted Langmuir model. The negative values of free energy change indicted the spontaneous nature of sorption.
The extraction of polyethylene residue components in soil was presented in this work, where polyethylene (PE) powder (Mw=5598) was taken as a simulated polyethylene residue, and decalin was as an excellent solvent. The effects of times of reflux extraction, total extraction time and soil type on the extraction ratio were investigated, aimed at finding out the optimum extraction condition. Results show that the optimum extraction ratio achieves up to 90 % (w/w) at 100 after extraction for 20 mins thrice. Meanwhile, the times of reflux extraction has the most significant influence on extraction ratio, followed by the total extraction time. However, soil type has little influence. The FTIR spectra illustrates that the structure of PE is not destroyed during the extraction. However, the molecular weight and molecular weight distribution test show the average molecular weight of PE decreases after the extraction, which is possibly caused by the degradation of PE.
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