In this paper,the hydrolysis of silicon nitride in pure water and 005mol·L-1 H2SO4 solution under the condition of ultrasonic irradiation was studied,and the influences of ultrasonic power and reactio...In this paper,the hydrolysis of silicon nitride in pure water and 005mol·L-1 H2SO4 solution under the condition of ultrasonic irradiation was studied,and the influences of ultrasonic power and reaction time on the hydrolysis of silicon nitride were investigated.In addition,we also compared the hydrolytic result of ultrasound with that of powerful agitation.The experimental results show that the hydrolytic ratio of silicon nitride is increasing with the rising of ultrasonic power and the lengthening of reaction time.The hydrolytic velocity in 005mol·L-1 H2SO4 solution is a little faster than that in pure water.And in lowpower ultrasound(100W～150W),the hydrolytic velocity is approximately equal to that in powerful agitation.However,the hydrolytic velocity is accelerated rapidly with the increasing of ultrasonic power.展开更多
This work is concentrated on elucidating the mechanism of the electric field enhanced water dissociation.
A simple model was established for the theoretical current-voltage characteristics in water dissociation proce...This work is concentrated on elucidating the mechanism of the electric field enhanced water dissociation.
A simple model was established for the theoretical current-voltage characteristics in water dissociation process on a
bipolar membrane based on the existence of a depletion layer and Onsager's theory. Particular attention was given
to the influence of applied voltage on depletion thickness and the dissociation constant. The factors on the water
splitting process, such as water diffusivity, water content, ion exchange capacity, temperature, relative permittivity,
etc. Were adequately analysed based on the derived model equations and several suggestions were proposed for
decreasing the applied voltage in practical operation. The water dissociation tests were conducted and compared
with both the theoretical calculation and the measured current-voltage curves reported in the literature, which
showed a very good prediction to practical current-voltage behavior of a bipolar membrane at high current densities
when the splitting of water actually commenced.展开更多
文摘In this paper,the hydrolysis of silicon nitride in pure water and 005mol·L-1 H2SO4 solution under the condition of ultrasonic irradiation was studied,and the influences of ultrasonic power and reaction time on the hydrolysis of silicon nitride were investigated.In addition,we also compared the hydrolytic result of ultrasound with that of powerful agitation.The experimental results show that the hydrolytic ratio of silicon nitride is increasing with the rising of ultrasonic power and the lengthening of reaction time.The hydrolytic velocity in 005mol·L-1 H2SO4 solution is a little faster than that in pure water.And in lowpower ultrasound(100W～150W),the hydrolytic velocity is approximately equal to that in powerful agitation.However,the hydrolytic velocity is accelerated rapidly with the increasing of ultrasonic power.
基金Supported by the National Natural Science Foundation of China (No. 29976040), the Natural Science Foundation of Anhui Province (No. 99045431) and Youth Foundation of USTC.
文摘This work is concentrated on elucidating the mechanism of the electric field enhanced water dissociation.
A simple model was established for the theoretical current-voltage characteristics in water dissociation process on a
bipolar membrane based on the existence of a depletion layer and Onsager's theory. Particular attention was given
to the influence of applied voltage on depletion thickness and the dissociation constant. The factors on the water
splitting process, such as water diffusivity, water content, ion exchange capacity, temperature, relative permittivity,
etc. Were adequately analysed based on the derived model equations and several suggestions were proposed for
decreasing the applied voltage in practical operation. The water dissociation tests were conducted and compared
with both the theoretical calculation and the measured current-voltage curves reported in the literature, which
showed a very good prediction to practical current-voltage behavior of a bipolar membrane at high current densities
when the splitting of water actually commenced.
