n-Butylacetate is synthesized using H2SO4-K2Cr2O7 modified coal activated carbon as catalyst.Factors influencing the reaction are discussed.It is showed that the fractional conversion of acetic acid could reach 99.2% ...n-Butylacetate is synthesized using H2SO4-K2Cr2O7 modified coal activated carbon as catalyst.Factors influencing the reaction are discussed.It is showed that the fractional conversion of acetic acid could reach 99.2% when the molar ratio of acid to n-butanol is 1∶1.5,reaction time is 2.5h,the amount of catalyst is as 5.26% as the mass of total reactants.In addition,the catalyst can be used repeatedly and has no pollution to environment.展开更多
The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA....The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA. The treatment of plasmid DNA with β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O resulted in a fast moving band in front of the three normal conformations(super coiled DNA, linear DNA and relaxed circular DNA) in agarose gel electrophoresis . These results indicate that this chemical material may have the ability to specifically cleavage DNA or to alter conformation of DNA molecules.展开更多
Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The ...Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The phase diagram of the system consisted of two invariant points E and F, five univariant curves, and four crystallization fields that belonged to K 2CO 3·3/2H 2O,Li 2 B 4O 7·3H 2O, K 2 B 4O 7 ·4H 2O and Li 2CO 3. The composition of the solution corresponding to E was w(CO 2- 3)=2.27 %, w(B 4O 2- 7) =6.05 %, w(K + ) =4.30%,w(Li + )=0.30 % and the equilibrium solids were Li 2 B 4O 7· 3H 2O+K 2 B 4O 7·4H 2O+Li 2CO 3;The composition of the solution for F was w(CO 2- 3) =22.45%,w(B 4O 2- 7)=1.88%,w(K + )=29.96%,w(Li + )=0.03% and the equilibrium solids were K 2CO 3·3/2H 2O+ K 2 B 4O 7·4H 2O+Li 2CO 3. K 2CO 3 possesses strong salting-out effect on K 2 B 4O 7,Li 2CO 3 and Li 2 B 4O 7.展开更多
ZHOU Bai-Bin *,1,2 WEI Yong-De 1 LI Zhong-Hua 1 ( 1 Department of Applied Chemistry,Ha rbin Institute of Technology ￡?Harbin￡±￡ì￡°￡°￡°￡±￡(c)( 2 Department of Chemistry,Harbin Norm...ZHOU Bai-Bin *,1,2 WEI Yong-De 1 LI Zhong-Hua 1 ( 1 Department of Applied Chemistry,Ha rbin Institute of Technology ￡?Harbin￡±￡ì￡°￡°￡°￡±￡(c)( 2 Department of Chemistry,Harbin Normal University￡?Harbin￡±￡ì￡°￡°￡?￡°￡(c) The air-solid interface reaction of Ce,Lu with K10 H 3[Gd (SiMo 4 W￡*O￡3￡1￡(c) 2]through chemistry-heated permeation is reported for the fi rst time￡(r)The permeated complex is characterized by ICP and the result shows tha t the mini mum Ce,Lu can permeate into the inner sph ere of K 10 H ￡3 ￡?Gd ￡¨SiMo ￡′ W ￡* O ￡3￡1 ￡(c) 2]The IR ,XRD patterns give the eviden ce that after permeation the comple x still keeps the Keggin structure,howe ver,its crystal structure is different from the complex before permeation￡(r)The cond uctivity of the permeated complex has been measured with the four-electr ode method and the data show that the co nductivity of the complex after permeation is 10 6 times higher than that of the sample before permeation and reaches ￡′￡(r)84 6×10 -1 S·cm -1 ￡(r)These indicate that the permeated c omplex is a good solid electrolyte and further appli cations are also expected￡(r)展开更多
Proper utilization of the FeSO4·7H2O waste slag generated from TiO2 industry is an urgent need, and Fe3O4 particles are currently being widely used in the wastewater flocculation field. In this work, magnetite wa...Proper utilization of the FeSO4·7H2O waste slag generated from TiO2 industry is an urgent need, and Fe3O4 particles are currently being widely used in the wastewater flocculation field. In this work, magnetite was recovered from ferrous sulphate by a novel co-precipitation method with calcium hydroxide as the precipitant. Under optimum conditions, the obtained spherical magnetite particles are well crystallized with a Fe304 purity of 88.78%, but apt to aggregate with a median particle size of 1.83 μm. Magnetic measurement reveals the obtained Fe304 particles are soft magnetic with a saturation magnetization of 81.73 A-m2/kg. In addition, a highly crystallized gypsum co-product is obtained in blocky or irregular shape. Predictably, this study would provide additional opportunities for future application of low-cost Fe3O4 particles in water treatment field.展开更多
文摘n-Butylacetate is synthesized using H2SO4-K2Cr2O7 modified coal activated carbon as catalyst.Factors influencing the reaction are discussed.It is showed that the fractional conversion of acetic acid could reach 99.2% when the molar ratio of acid to n-butanol is 1∶1.5,reaction time is 2.5h,the amount of catalyst is as 5.26% as the mass of total reactants.In addition,the catalyst can be used repeatedly and has no pollution to environment.
文摘The interaction between β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O and DNA was investigated by agarose gel electrophoresis. The results suggest that β-K 4H 3[SiW 9O 37(CpTi) 3]·11H 2O can degrade the genomic DNA. The treatment of plasmid DNA with β-K 4H 3 [SiW 9O 37(CpTi) 3]·11H 2O resulted in a fast moving band in front of the three normal conformations(super coiled DNA, linear DNA and relaxed circular DNA) in agarose gel electrophoresis . These results indicate that this chemical material may have the ability to specifically cleavage DNA or to alter conformation of DNA molecules.
文摘Solubilities and properties (density, conductivity and pH value) of solutions in the quaternary system Li +,K +//CO 2- 3,B 4O 2- 7-H 2O at 288 K were experimentally studied with the isothermal equilibrium method. The phase diagram of the system consisted of two invariant points E and F, five univariant curves, and four crystallization fields that belonged to K 2CO 3·3/2H 2O,Li 2 B 4O 7·3H 2O, K 2 B 4O 7 ·4H 2O and Li 2CO 3. The composition of the solution corresponding to E was w(CO 2- 3)=2.27 %, w(B 4O 2- 7) =6.05 %, w(K + ) =4.30%,w(Li + )=0.30 % and the equilibrium solids were Li 2 B 4O 7· 3H 2O+K 2 B 4O 7·4H 2O+Li 2CO 3;The composition of the solution for F was w(CO 2- 3) =22.45%,w(B 4O 2- 7)=1.88%,w(K + )=29.96%,w(Li + )=0.03% and the equilibrium solids were K 2CO 3·3/2H 2O+ K 2 B 4O 7·4H 2O+Li 2CO 3. K 2CO 3 possesses strong salting-out effect on K 2 B 4O 7,Li 2CO 3 and Li 2 B 4O 7.
文摘ZHOU Bai-Bin *,1,2 WEI Yong-De 1 LI Zhong-Hua 1 ( 1 Department of Applied Chemistry,Ha rbin Institute of Technology ￡?Harbin￡±￡ì￡°￡°￡°￡±￡(c)( 2 Department of Chemistry,Harbin Normal University￡?Harbin￡±￡ì￡°￡°￡?￡°￡(c) The air-solid interface reaction of Ce,Lu with K10 H 3[Gd (SiMo 4 W￡*O￡3￡1￡(c) 2]through chemistry-heated permeation is reported for the fi rst time￡(r)The permeated complex is characterized by ICP and the result shows tha t the mini mum Ce,Lu can permeate into the inner sph ere of K 10 H ￡3 ￡?Gd ￡¨SiMo ￡′ W ￡* O ￡3￡1 ￡(c) 2]The IR ,XRD patterns give the eviden ce that after permeation the comple x still keeps the Keggin structure,howe ver,its crystal structure is different from the complex before permeation￡(r)The cond uctivity of the permeated complex has been measured with the four-electr ode method and the data show that the co nductivity of the complex after permeation is 10 6 times higher than that of the sample before permeation and reaches ￡′￡(r)84 6×10 -1 S·cm -1 ￡(r)These indicate that the permeated c omplex is a good solid electrolyte and further appli cations are also expected￡(r)
基金Project(2013A090100013)supported by the Special Project on the Integration of Industry,Education and Research of Guangdong Province,ChinaProject(201407300993)supported by the High-Tech Research and Development Program of Xinjiang Uygur Autonomous Region,China
文摘Proper utilization of the FeSO4·7H2O waste slag generated from TiO2 industry is an urgent need, and Fe3O4 particles are currently being widely used in the wastewater flocculation field. In this work, magnetite was recovered from ferrous sulphate by a novel co-precipitation method with calcium hydroxide as the precipitant. Under optimum conditions, the obtained spherical magnetite particles are well crystallized with a Fe304 purity of 88.78%, but apt to aggregate with a median particle size of 1.83 μm. Magnetic measurement reveals the obtained Fe304 particles are soft magnetic with a saturation magnetization of 81.73 A-m2/kg. In addition, a highly crystallized gypsum co-product is obtained in blocky or irregular shape. Predictably, this study would provide additional opportunities for future application of low-cost Fe3O4 particles in water treatment field.
