Intensity of cavitation is significant in ultrasonic wastewater treatment,but is complicated to measure.A time difference based method of ultrasonic cavitation measurement is proposed.The time differences at different...Intensity of cavitation is significant in ultrasonic wastewater treatment,but is complicated to measure.A time difference based method of ultrasonic cavitation measurement is proposed.The time differences at different powers of 495 kHz ultrasonic are measured in experiment in comparison with conductimetric method.Simulation results show that time difference and electrical conductivity are both approximately positive proportional to the ultrasonic power.The degradation of PNP solution verifies the availability in wastewater treatment by using ultrasonic.展开更多
In this paper,a new delaminated mesoporous material was prepared by swelling the lamellar phyllosilicate Magadiite using cetyltrimethylammonium bromide and tetrapropylammonium hydroxide solution,followed by delaminati...In this paper,a new delaminated mesoporous material was prepared by swelling the lamellar phyllosilicate Magadiite using cetyltrimethylammonium bromide and tetrapropylammonium hydroxide solution,followed by delamination under the cavitation of ultrasonic treatment.Various characterization tools including XRD,N2 adsorption,NMR,IR,SEM and TEM were employed to observe its structure and morphology.XRD results show that the delaminated material has no long-range crystalline order.Furthermore,not only high surface area is obtained,but almost half of it is external surface.The observation for the morphology further reveals that it is made up of the random stacking of single or few layers.All these characters show that this delaminated mesoporous material meets the requirements for application as support in the hydrotreatment of heavy molecules.展开更多
基金Supported by the National Natural Science Foundation of China(No.11274092,11274091,11304026)the Fundamental Research Funds for the Central Universities(No.14B10128)
文摘Intensity of cavitation is significant in ultrasonic wastewater treatment,but is complicated to measure.A time difference based method of ultrasonic cavitation measurement is proposed.The time differences at different powers of 495 kHz ultrasonic are measured in experiment in comparison with conductimetric method.Simulation results show that time difference and electrical conductivity are both approximately positive proportional to the ultrasonic power.The degradation of PNP solution verifies the availability in wastewater treatment by using ultrasonic.
文摘In this paper,a new delaminated mesoporous material was prepared by swelling the lamellar phyllosilicate Magadiite using cetyltrimethylammonium bromide and tetrapropylammonium hydroxide solution,followed by delamination under the cavitation of ultrasonic treatment.Various characterization tools including XRD,N2 adsorption,NMR,IR,SEM and TEM were employed to observe its structure and morphology.XRD results show that the delaminated material has no long-range crystalline order.Furthermore,not only high surface area is obtained,but almost half of it is external surface.The observation for the morphology further reveals that it is made up of the random stacking of single or few layers.All these characters show that this delaminated mesoporous material meets the requirements for application as support in the hydrotreatment of heavy molecules.
