The NaAlO_2,Na_2SiO_3-9H_2O,NaOH and CsOH·H_2O were used as raw materials to synthesize Cs-doped sodahte samples by a chemical synthetic approach.The effects of different Cs doping contents on structural and UV-p...The NaAlO_2,Na_2SiO_3-9H_2O,NaOH and CsOH·H_2O were used as raw materials to synthesize Cs-doped sodahte samples by a chemical synthetic approach.The effects of different Cs doping contents on structural and UV-photochromic properties of sodalite were investigated.The results suggested that the maximum doping content of Cs in sodalite was about 2.9%,and the impure phase CsAlSiO_4·H_2O arose exceeding the doping content.The lattice parameters(a and v) of sodalite decreased integrally due to the effect of hydrated Cs ions on sodalite lattice.Meanwhile,the surface morphology of Cs-doped sodalite consisted of petal shaped aggregated particles at the maximum Cs doping content,which was basically similar as pristine sodalite.In addition,the ultraviolet(UV) absorptance of the Cs-doped sodalite,compared with pure sodalite,increased about 1.3%-2.3%from 225 to 280 nm and about 1.8%-2.8%from 280 to 350 nm,respectively.展开更多
Molecular oxygen(O_(2))is activated to reactive oxygen species(ROS)by transferring energy and carriers in the photocatalytic process,which plays an important role in environmental remediation.Herein,Cs-doped carbon ni...Molecular oxygen(O_(2))is activated to reactive oxygen species(ROS)by transferring energy and carriers in the photocatalytic process,which plays an important role in environmental remediation.Herein,Cs-doped carbon nitride(CN-xCs,x=0.2,0.8,1)was prepared by CsCl directly inducing the structural reconstruction of carbon nitride(CN),which had obvious molecular oxygen activation ability to promote tetracycline(TC)degradation.Besides,we explored the influence of Cs doping concentration.As a consequence,the doping concentration of Cs was an important factor affecting the activation of O_(2),which could cause changes in the physical and chemical structure of CN,make O enter the CN structure,form N vacancy defects and cyano groups.In addition,a proper amount of Cs doping could reduce the band gap value,increase the light absorption range,have better charge separation and transfer performance,which could remarkably promote the activation of O_(2).Benefiting from these advantages,CN-0.8Cs could generate a higher concentration of superoxide radicals(•O_(2)^(−),179.30µmol/L),which was much higher than CN(6.22µmol/L).Therefore,it exhibited excellent TC degradation photocatalytic performance,and the rate constant k of TC degradation was 0.020 min^(−1),which was 6.7 times the degradation rate of CN(k=0.0030 min^(−1)).Furthermore,the possible degradation pathways of TC were proposed based on the results of HPLC-MS.展开更多
The physico-chemical properties of cesium doped SnO2 nanocrystals synthesized by wet chemical method have been investigated. Scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive X-ray ana...The physico-chemical properties of cesium doped SnO2 nanocrystals synthesized by wet chemical method have been investigated. Scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive X-ray analysis （EDAX）, inductively coupled plasma （ICP）, atomic absorption spectroscopic （AAS） analyses, UV-vis-NIR spectral studies and dielectric studies were carried out for both pure SnO2 and cesium doped SnO2 nano-samples. All samples of SnO2 did not show any metallic cluster, but the sample containing cesium as a dopant displayed significant activity. The products formed were chloride and water representing a competitive advantage from the stand point of environmental protection.展开更多
基金sponsored by National Natural Science Foundation(China)(41372052)Innovation Funds of Southwest University of Science and Technology (Sichuan Province,China)(14ycx028)Key Laboratory of Solid Waste Treatment and Resource Recycling Ministry of Education(Sichuan Province,China)
文摘The NaAlO_2,Na_2SiO_3-9H_2O,NaOH and CsOH·H_2O were used as raw materials to synthesize Cs-doped sodahte samples by a chemical synthetic approach.The effects of different Cs doping contents on structural and UV-photochromic properties of sodalite were investigated.The results suggested that the maximum doping content of Cs in sodalite was about 2.9%,and the impure phase CsAlSiO_4·H_2O arose exceeding the doping content.The lattice parameters(a and v) of sodalite decreased integrally due to the effect of hydrated Cs ions on sodalite lattice.Meanwhile,the surface morphology of Cs-doped sodalite consisted of petal shaped aggregated particles at the maximum Cs doping content,which was basically similar as pristine sodalite.In addition,the ultraviolet(UV) absorptance of the Cs-doped sodalite,compared with pure sodalite,increased about 1.3%-2.3%from 225 to 280 nm and about 1.8%-2.8%from 280 to 350 nm,respectively.
基金supported by the National Natural Science Foundation of China(Nos.21872102,21906001 and 22172080)。
文摘Molecular oxygen(O_(2))is activated to reactive oxygen species(ROS)by transferring energy and carriers in the photocatalytic process,which plays an important role in environmental remediation.Herein,Cs-doped carbon nitride(CN-xCs,x=0.2,0.8,1)was prepared by CsCl directly inducing the structural reconstruction of carbon nitride(CN),which had obvious molecular oxygen activation ability to promote tetracycline(TC)degradation.Besides,we explored the influence of Cs doping concentration.As a consequence,the doping concentration of Cs was an important factor affecting the activation of O_(2),which could cause changes in the physical and chemical structure of CN,make O enter the CN structure,form N vacancy defects and cyano groups.In addition,a proper amount of Cs doping could reduce the band gap value,increase the light absorption range,have better charge separation and transfer performance,which could remarkably promote the activation of O_(2).Benefiting from these advantages,CN-0.8Cs could generate a higher concentration of superoxide radicals(•O_(2)^(−),179.30µmol/L),which was much higher than CN(6.22µmol/L).Therefore,it exhibited excellent TC degradation photocatalytic performance,and the rate constant k of TC degradation was 0.020 min^(−1),which was 6.7 times the degradation rate of CN(k=0.0030 min^(−1)).Furthermore,the possible degradation pathways of TC were proposed based on the results of HPLC-MS.
文摘The physico-chemical properties of cesium doped SnO2 nanocrystals synthesized by wet chemical method have been investigated. Scanning electron microscopy （SEM）, X-ray diffraction （XRD）, energy dispersive X-ray analysis （EDAX）, inductively coupled plasma （ICP）, atomic absorption spectroscopic （AAS） analyses, UV-vis-NIR spectral studies and dielectric studies were carried out for both pure SnO2 and cesium doped SnO2 nano-samples. All samples of SnO2 did not show any metallic cluster, but the sample containing cesium as a dopant displayed significant activity. The products formed were chloride and water representing a competitive advantage from the stand point of environmental protection.
