In this paper, magnetic nanospheres coated with polystyrene(Fe3O4@PS) were prepared for the removal of organochlorine pesticides from aqueous solutions. The obtained Fe3O4@PS was round shape with diameter of 55±1...In this paper, magnetic nanospheres coated with polystyrene(Fe3O4@PS) were prepared for the removal of organochlorine pesticides from aqueous solutions. The obtained Fe3O4@PS was round shape with diameter of 55±11 nm. The VSM results illustrated that its higher saturated magnetization was 36.76 emu g-1 and it could be easily separated from aqueous solutions with a permanent magnet. The adsorption results showed that pesticides could be effectively adsorbed and the adsorption equilibrium time was less than 20 mins. The pseudo-second-order model was suitable to describe the adsorption kinetics. Compared with the Freundlich adsorption model, the adsorption data fitted well with Langmuir model. The effect of salinity and humic acid was also studied and the results illustrated that they could be neglected under optimized conditions. The asobtained sorbent showed a good performance with more than 93.3% pesticides removal in treating actual water samples.展开更多
[Objective]The research aimed to study the effect of underground temperature on the adsorption behavior of chlorobenzene under artificial recharge condition. [Method]Based on the prior researches,combining actual cond...[Objective]The research aimed to study the effect of underground temperature on the adsorption behavior of chlorobenzene under artificial recharge condition. [Method]Based on the prior researches,combining actual condition of the artificial recharge test site,the adsorption behavior of chlorobenzene under the background of artificial recharge was discussed. [Result]The adsorption reaction of chlorobenzene corresponded with quasi-first-order and quasi-second-order kinetics equations at certain concentration. When temperature rose,reaction rate accelerated,and adsorption balance time shortened to 12 (0 ℃) ,10 (10 ℃) and 8 (20 ℃) h. The adsorption of chlorobenzene corresponded with isothermal adsorption model very well at different concentrations. When temperature ranged from 0 to 20 ℃,the adsorption amount of medium on chlorobenzene increased at equilibrium time. The maximal adsorption amounts calculated by Langmuir model were 20. 747, 21. 505, 23. 364 μg/g at 0,10 and 20 ℃, respectively. [Conclusion]The adsorption of chlorobenzene in aquifer medium was endothermic reaction,and the best season of artificial recharge was in summer.展开更多
基金Funded by the National Natural Science Foundation of China(No.21007062)SKLECE Open Fund(No.KF2009-21)
文摘In this paper, magnetic nanospheres coated with polystyrene(Fe3O4@PS) were prepared for the removal of organochlorine pesticides from aqueous solutions. The obtained Fe3O4@PS was round shape with diameter of 55±11 nm. The VSM results illustrated that its higher saturated magnetization was 36.76 emu g-1 and it could be easily separated from aqueous solutions with a permanent magnet. The adsorption results showed that pesticides could be effectively adsorbed and the adsorption equilibrium time was less than 20 mins. The pseudo-second-order model was suitable to describe the adsorption kinetics. Compared with the Freundlich adsorption model, the adsorption data fitted well with Langmuir model. The effect of salinity and humic acid was also studied and the results illustrated that they could be neglected under optimized conditions. The asobtained sorbent showed a good performance with more than 93.3% pesticides removal in treating actual water samples.
基金Supported by National Natural Science Foundation Project, China (41103045) "Science Frontier and Interdiscipline Innovation Project" ,Jilin University, China (201003031)
文摘[Objective]The research aimed to study the effect of underground temperature on the adsorption behavior of chlorobenzene under artificial recharge condition. [Method]Based on the prior researches,combining actual condition of the artificial recharge test site,the adsorption behavior of chlorobenzene under the background of artificial recharge was discussed. [Result]The adsorption reaction of chlorobenzene corresponded with quasi-first-order and quasi-second-order kinetics equations at certain concentration. When temperature rose,reaction rate accelerated,and adsorption balance time shortened to 12 (0 ℃) ,10 (10 ℃) and 8 (20 ℃) h. The adsorption of chlorobenzene corresponded with isothermal adsorption model very well at different concentrations. When temperature ranged from 0 to 20 ℃,the adsorption amount of medium on chlorobenzene increased at equilibrium time. The maximal adsorption amounts calculated by Langmuir model were 20. 747, 21. 505, 23. 364 μg/g at 0,10 and 20 ℃, respectively. [Conclusion]The adsorption of chlorobenzene in aquifer medium was endothermic reaction,and the best season of artificial recharge was in summer.
