Sulfate-modified titanium dioxide-bearing blast furnace slag（STBBFS） photocatalysts were prepared by the high energy ball milling method with（NH4）2SO4 and titanium dioxide-bearing blast furnace slag（TBBFS） as ra...Sulfate-modified titanium dioxide-bearing blast furnace slag（STBBFS） photocatalysts were prepared by the high energy ball milling method with（NH4）2SO4 and titanium dioxide-bearing blast furnace slag（TBBFS） as raw materials.X-ray photoelectron spectroscopy（XPS）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,thermogravimetric analysis（TGA）,UV-visible diffuse reflectance absorption spectra（UV-Vis）,adsorption experiment and photocatalytic degradation measurement were conducted to characterize the structure,surface status,light absorption capacity,adsorption capacity and photocatalytic activity of the obtained photocatalysts.The adsorption equilibrium was described by the Langmuir isotherm model with a maximum adsorption capacity of 8.25 mg/g of Cr（VI） ions onto the STBBFS photocatalysts.As a result,sulfation of TBBFS improved the photocatalytic activities of STBBFSx photocatalysts.At a low calcination temperature,the photocatalytic activity of STBBFS300 photocatalyst was markedly higher compared with TBBFSx prepared at high calcination temperature,indicating that the photocatalytic activity of STBBFSx photocatalyst was determined by the balanced result between adsorption capacity and perovskite content.展开更多
A calcium sulfate whisker （CSW） coated with glutaraldehyde crosslinked chitosan （GACS） was prepared to reinforce polyvinyl chloride （PVC） in this study. The results show that the optimum concentration of both ch...A calcium sulfate whisker （CSW） coated with glutaraldehyde crosslinked chitosan （GACS） was prepared to reinforce polyvinyl chloride （PVC） in this study. The results show that the optimum concentration of both chitosan （CS） and glutaraldehyde （GA） is 0.05 wt%. The tensile strength, impact strength, flexural modulus and vicat softening temperature of the PVC composite with 12 wt% of modified CSW are in- creased by 1 Z5%, 40.4%, 0.8% and 3.8% compared with those of the PVC composite with 12 wt~ of unmodified CSW, and by 2.9%, 42.4%, 2Z1% and 6.8% compared with those of pure PVC, respectively. The dynamic mechanical analysis results indicate that the modified CSW/PVC composite exhibits much higher storage modulus and glass transition temperature than those of unmodified CSW/PVC composite and pure PVC. In addition, the modified CSW/PVC composite also demonstrates good thermal properties with a high rapidest decomposition temperature （Trvd） and char residue. The scanning electron microscopy images of tensile-fractured surfaces show that the modified CSW has a strong interfacial adhesion with PVC matrix.展开更多
In this study,the rice bran polysaccharide(RBP)was modified using the sulfur trioxide-pyridine complexation method.The effects of sulfation modification on the physicochemical properties,structure,bacterial inhibition...In this study,the rice bran polysaccharide(RBP)was modified using the sulfur trioxide-pyridine complexation method.The effects of sulfation modification on the physicochemical properties,structure,bacterial inhibition,and inhibitory mechanism of the polysaccharide were investigated.Sulfated modification reduces the carbohydrate and protein content,increases the molecular weight,and changes the proportion of monosaccharides of RBP.UV-Vis,FT-IR,and NMR spectra confirmed that the modification was successful and the sulfation substitution occurred on hydroxyl groups at C-6.The sulfated rice bran polysaccharide(SRBP)inhibited all the five pathogenic bacterial strains,among which Staphylococcus aureus was the most sensitive,with an MIC of 4 mg/mL.Scanning electron microscopy images revealed that SRBP caused morphological damage and cell rupture of the bacterium,thereby causing an increase in nucleic acid and protein contents,conductivity,alkaline phosphatase,and Na^(+)/K^(+)-ATPase.Clearly,SRBP can act as an alternative derivative of natural antibacterial agents for industrial applications.展开更多
基金Project (2007CB613504) supported by the National Basic Research Program of ChinaProject (307009) supported by the Foundation for Key Program of Ministry of Education,China+1 种基金Project (N110423003) supported by the Fundamental Research Funds for the Central Universities,ChinaProject (E2012501012) supported by Natural Science Foundation-Steel and Iron Foundation of Hebei Province,China
文摘Sulfate-modified titanium dioxide-bearing blast furnace slag（STBBFS） photocatalysts were prepared by the high energy ball milling method with（NH4）2SO4 and titanium dioxide-bearing blast furnace slag（TBBFS） as raw materials.X-ray photoelectron spectroscopy（XPS）,X-ray diffraction（XRD）,scanning electron microscopy（SEM）,thermogravimetric analysis（TGA）,UV-visible diffuse reflectance absorption spectra（UV-Vis）,adsorption experiment and photocatalytic degradation measurement were conducted to characterize the structure,surface status,light absorption capacity,adsorption capacity and photocatalytic activity of the obtained photocatalysts.The adsorption equilibrium was described by the Langmuir isotherm model with a maximum adsorption capacity of 8.25 mg/g of Cr（VI） ions onto the STBBFS photocatalysts.As a result,sulfation of TBBFS improved the photocatalytic activities of STBBFSx photocatalysts.At a low calcination temperature,the photocatalytic activity of STBBFS300 photocatalyst was markedly higher compared with TBBFSx prepared at high calcination temperature,indicating that the photocatalytic activity of STBBFSx photocatalyst was determined by the balanced result between adsorption capacity and perovskite content.
基金supported by the National Natural Science Foundation of China (No. U 1507123)the Foundation from Qinghai Science and Technology Department (No. 2014-HZ-817)
文摘A calcium sulfate whisker （CSW） coated with glutaraldehyde crosslinked chitosan （GACS） was prepared to reinforce polyvinyl chloride （PVC） in this study. The results show that the optimum concentration of both chitosan （CS） and glutaraldehyde （GA） is 0.05 wt%. The tensile strength, impact strength, flexural modulus and vicat softening temperature of the PVC composite with 12 wt% of modified CSW are in- creased by 1 Z5%, 40.4%, 0.8% and 3.8% compared with those of the PVC composite with 12 wt~ of unmodified CSW, and by 2.9%, 42.4%, 2Z1% and 6.8% compared with those of pure PVC, respectively. The dynamic mechanical analysis results indicate that the modified CSW/PVC composite exhibits much higher storage modulus and glass transition temperature than those of unmodified CSW/PVC composite and pure PVC. In addition, the modified CSW/PVC composite also demonstrates good thermal properties with a high rapidest decomposition temperature （Trvd） and char residue. The scanning electron microscopy images of tensile-fractured surfaces show that the modified CSW has a strong interfacial adhesion with PVC matrix.
基金Financial support for this research was provided by Shanghai Sailing Program(21YF1441400)Shanghai Agricultural Products Preservation and Processing Professional Technical Service Platform(21DZ2292200)Agri-food Storage and Processing Engineering Technology Research Center of Shanghai(19DZ2251600).
文摘In this study,the rice bran polysaccharide(RBP)was modified using the sulfur trioxide-pyridine complexation method.The effects of sulfation modification on the physicochemical properties,structure,bacterial inhibition,and inhibitory mechanism of the polysaccharide were investigated.Sulfated modification reduces the carbohydrate and protein content,increases the molecular weight,and changes the proportion of monosaccharides of RBP.UV-Vis,FT-IR,and NMR spectra confirmed that the modification was successful and the sulfation substitution occurred on hydroxyl groups at C-6.The sulfated rice bran polysaccharide(SRBP)inhibited all the five pathogenic bacterial strains,among which Staphylococcus aureus was the most sensitive,with an MIC of 4 mg/mL.Scanning electron microscopy images revealed that SRBP caused morphological damage and cell rupture of the bacterium,thereby causing an increase in nucleic acid and protein contents,conductivity,alkaline phosphatase,and Na^(+)/K^(+)-ATPase.Clearly,SRBP can act as an alternative derivative of natural antibacterial agents for industrial applications.
