Roof greening is crucial for improving urban eco-environment, showing benefits, ecological y or social y, but it is so hard for investors in terms of capitals or promotion. The research introduced sponge-type composit...Roof greening is crucial for improving urban eco-environment, showing benefits, ecological y or social y, but it is so hard for investors in terms of capitals or promotion. The research introduced sponge-type composite vegetation carpet techniques and constructionprocess, making a breakthrough in greening form and having formulated a new one.展开更多
A BiOCl-Bi12O17Cl2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal method.The texture,structu...A BiOCl-Bi12O17Cl2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal method.The texture,structure,optical,and photocatalytic properties of the composite were characterized.The results showed that the composite had a sheet flower-like structure with a large specific surface area.Ultraviolet-visible diffuse reflection spectra and photoluminescence spectra showed that the composite had an excellent visible-light response and a low recombination rate of photoinduced electron hole pairs.The photocatalytic property of the composite was evaluated by the removal efficiency of rhodamine B and ciprofloxacin under visible-light illumination.The composite’s reaction rate constant of removing rhodamine B(/ciprofloxacin)was approximately 8.14(/4.94),42.63(/11.91)and 64.66(/36.07)times that of Bi12O17Cl2,P25,and BiOCl,respectively.Furthermore,the composite showed a wide applicable pH range and excellent reusability.Mechanism analysis showed that photogenerated holes played a dominant role and·O2–also contributed to photocatalytic degradation.In summary,this study presents a high-efficiency photocatalyst for wastewater treatment.展开更多
CdSe quantum dots(QDs)hybridized with graphene oxide(GO)are synthesized by a facile chemical precipitation method.The absorption of the CdSe/GO nanocomposite is increased with a significantblue shift with respect to C...CdSe quantum dots(QDs)hybridized with graphene oxide(GO)are synthesized by a facile chemical precipitation method.The absorption of the CdSe/GO nanocomposite is increased with a significantblue shift with respect to CdSe QDs.The specific surface area of the CdSe/GO nanocomposite is10.4m2/g,which is higher than that of CdSe QDs(5m2/g).The PL intensity of the CdSe/GO nanocomposite is lower than that of the CdSe QDs owing to the inhibition of the recombination of electron‐hole pairs in the composite.In Raman analysis,the two bands of the CdSe/GO nanocomposite are shifted to higher wavenumbers with respect to graphene oxide,which is attributed to electron injection that is induced by CdSe QDs into graphene oxide.Using the Brilliant Green dye,the photocatalytic reduction efficiency of CdSe QDs and the CdSe/GO nanocomposite under sunlight irradiation for90min are approximately81.9%and95.5%,respectively.The calculated photodegradation rate constants for CdSe QDs and the CdSe/GO nanocomposite are0.0190min–1and0.0345min–1,respectively.The enhanced photocatalytic activity of the CdSe/GO nanocomposite can be attributed to the high specific surface area and the reduction of electron‐hole pair recombination because of the introduction of graphene oxide.展开更多
基金Supported by Guangdong Province Soft Science Research Program(2014B090903015)Guangdong Province Science&Technology Cooperation Program([2015]162)~~
文摘Roof greening is crucial for improving urban eco-environment, showing benefits, ecological y or social y, but it is so hard for investors in terms of capitals or promotion. The research introduced sponge-type composite vegetation carpet techniques and constructionprocess, making a breakthrough in greening form and having formulated a new one.
基金supported by National Water Pollution Control and Treatment Science and Technology Major Project(2018ZX07110003)Key Research and Development Project of Shandong Province(2018CXGC1007)~~
文摘A BiOCl-Bi12O17Cl2 nanocomposite with a high visible-light response and a low photoinduced electron-hole pair recombination rate was successfully synthesized using an ultrasonic-hydrothermal method.The texture,structure,optical,and photocatalytic properties of the composite were characterized.The results showed that the composite had a sheet flower-like structure with a large specific surface area.Ultraviolet-visible diffuse reflection spectra and photoluminescence spectra showed that the composite had an excellent visible-light response and a low recombination rate of photoinduced electron hole pairs.The photocatalytic property of the composite was evaluated by the removal efficiency of rhodamine B and ciprofloxacin under visible-light illumination.The composite’s reaction rate constant of removing rhodamine B(/ciprofloxacin)was approximately 8.14(/4.94),42.63(/11.91)and 64.66(/36.07)times that of Bi12O17Cl2,P25,and BiOCl,respectively.Furthermore,the composite showed a wide applicable pH range and excellent reusability.Mechanism analysis showed that photogenerated holes played a dominant role and·O2–also contributed to photocatalytic degradation.In summary,this study presents a high-efficiency photocatalyst for wastewater treatment.
基金supported by the National Natural Science Foundation of China(51774259)Engineering Research Center of Nano-Geo Materials of Ministry of Education(NGM2017KF004 and NGM2017KF012)~~
文摘CdSe quantum dots(QDs)hybridized with graphene oxide(GO)are synthesized by a facile chemical precipitation method.The absorption of the CdSe/GO nanocomposite is increased with a significantblue shift with respect to CdSe QDs.The specific surface area of the CdSe/GO nanocomposite is10.4m2/g,which is higher than that of CdSe QDs(5m2/g).The PL intensity of the CdSe/GO nanocomposite is lower than that of the CdSe QDs owing to the inhibition of the recombination of electron‐hole pairs in the composite.In Raman analysis,the two bands of the CdSe/GO nanocomposite are shifted to higher wavenumbers with respect to graphene oxide,which is attributed to electron injection that is induced by CdSe QDs into graphene oxide.Using the Brilliant Green dye,the photocatalytic reduction efficiency of CdSe QDs and the CdSe/GO nanocomposite under sunlight irradiation for90min are approximately81.9%and95.5%,respectively.The calculated photodegradation rate constants for CdSe QDs and the CdSe/GO nanocomposite are0.0190min–1and0.0345min–1,respectively.The enhanced photocatalytic activity of the CdSe/GO nanocomposite can be attributed to the high specific surface area and the reduction of electron‐hole pair recombination because of the introduction of graphene oxide.
