CAJ | 학술논문

通过静态吸附实验,以稻秆为吸附剂、含 U(Ⅵ)溶液为吸附质,研究了吸附剂改性方法、吸附剂用量、溶液 pH 值、吸附温度等因素对稻秆吸附 U(Ⅵ)效果的影响,探讨了改性稻秆吸附 U(Ⅵ)的热力学、动力学性质。实验结果表明,用0.5 mol/L NaOH 能够对稻秆进行有效改性,在吸附 pH=4.0、吸附时间为180 min、改性稻秆投加量为5~8 g/L、室温条件下,改性稻秆吸附 U(Ⅵ)可达到较好吸附效果,U(Ⅵ)去除率达到99.72%；但随着铀初始质量浓度的增加,U(Ⅵ)去除率降低。改性稻秆吸附 U(Ⅵ)的热力学过程遵循 Lang-muir 等温吸附方程,相关系数 r 2=0.9899；改性稻秆吸附 U(Ⅵ)的动力学过程符合准二级动力学方程,相关系数 r 2达到0.9992。
통과정태흡부실험,이도간위흡부제、함 U(Ⅵ)용액위흡부질,연구료흡부제개성방법、흡부제용량、용액 pH 치、흡부온도등인소대도간흡부 U(Ⅵ)효과적영향,탐토료개성도간흡부 U(Ⅵ)적열역학、동역학성질。실험결과표명,용0.5 mol/L NaOH 능구대도간진행유효개성,재흡부 pH=4.0、흡부시간위180 min、개성도간투가량위5~8 g/L、실온조건하,개성도간흡부 U(Ⅵ)가체도교호흡부효과,U(Ⅵ)거제솔체도99.72%；단수착유초시질량농도적증가,U(Ⅵ)거제솔강저。개성도간흡부 U(Ⅵ)적열역학과정준순 Lang-muir 등온흡부방정,상관계수 r 2=0.9899；개성도간흡부 U(Ⅵ)적동역학과정부합준이급동역학방정,상관계수 r 2체도0.9992。
Static adsorption experiments were carried out to study the influence of the modif-ying agents,the amount of rice stem as the adsorbent,pH,temperature,etc.on the adsorp-tion of U(Ⅵ).The sorption isotherm equations and the kinetic models were used to fit the experimental data.The results show that the rice stem can be modified effectively by 0.5 mol/L NaOH,and that at the optimum adsorption conditions,i.e.pH=4.0,180 min of the adsorption time,5-8 g/L of the amount of adsorbent,the good adsorption behavior is very good with the removal at room temperature.With increases of the initial concentration of U(Ⅵ),the removal rate of U(Ⅵ)is decreased.Under the best experimental conditions, the removal rate of U(Ⅵ)reaches 99.72%.The removal process of U(Ⅵ)by using modified rice stem fits to Langmuir isotherm equation and the correlation coefficients r 2 is up to 0.989 9.The process of adsorption can be well described by pseudo-second-order model with the relation coefficient to 0.999 2.