Adsorption behavior of uranyl ions onto amino-type adsorbents prepared by radiation-induced graft copolymerization

Amino-type adsorbents(ATAs) were prepared by radiation-induced graft copolymerization of 4-hydroxybutyl acry late glycidyl ether(HB) onto a polyethylene-coated polypropylene(PE/PP) duplex fiber of a non-woven fabric,and modified with different amines of ethylenediamine(EDA),diethylenetriamine(DETA),triethylenetetramine(TETA) and diethylamine(DEA).The adsorption behavior of uranyl ions onto the ATAs was studied in batch experiments.The effects of the contact time,initial concentration of the ions,temperature,and pH value.The salinity were investigated along with the adsorption kinetics and the adsorption isotherms.The kinetic experimental data followed the pseudo second-order kinetic model,and the adsorption isotherms correlated well with the Langmuir model.The ATAs showed good efficiency in adsorbing uranyl ions,with the best saturation adsorption capacity being 64.26 mg g~(-1) for ATA-DETA within 120 min.The temperature dependence of ATADETA was quite abnormal and the quickest behavior was obtained at 25 ℃.ATAs showed good adsorption capacity over a wide pH range of 4.0-8.5,and HCl could be used in the elution process.Salinity of the solution had great effect on the adsorption capacity,3.5%salinity resulted in a 55%loss of capacity from ATA-DETA.The selectivity of ATA-DETA showed an order of:UO_2~(2+)≈Fe~(3+) Zn~(2+) VO_3~- Co~(2+) Ni~(2+).     

超声波提取杏鲍菇三萜类化合物工艺的研究

在单因素试验的基础上,利用响应曲面设计(Response surface methodology,RSM)系统研究乙醇浓度、超声波功率、超声时间和料液比等因素对杏鲍菇三萜类化合物提取率的影响。确定超声波辅助提取杏鲍菇三萜类化合物的最佳工艺条件为:乙醇浓度88.20%、超声波功率为207.40 W、超声时间为33.19 min、料液比1∶25。最佳条件下三萜类化合物的提取率可达到16.832%。