CAJ | 학술논문

采用羟基铝改性有机膨润土(organic bentonite modified by hydroxy aluminum,OBA),以提高改性有机膨润土(organic bentonite, OB)对Cr(Ⅵ)的吸附能力.探讨了OBA用量、温度和pH值对Cr(Ⅵ)吸附能力的影响,以及OBA对Cr(Ⅵ)的吸附热力学和吸附动力学过程.结果表明,OBA对Cr(Ⅵ)的吸附能力显著高于OB;温度越高,吸附能力越差,最佳温度为25 ℃左右;在酸性条件下,pH值对OBA吸附Cr(Ⅵ)的影响较小;在碱性条件下,随着pH值提高,其吸附率降低;OBA对Cr(Ⅵ)的吸附符合Langmuir吸附等温曲线,最大吸附量为14.992 5 mg·g-1;OBA对Cr(Ⅵ)的吸附动力学方程符合伪二级动力学方程;OBA吸附Cr(Ⅵ)后可以脱附再生,但是,脱附再生后,Cr(Ⅵ)的吸附能力降低.
채용간기려개성유궤팽윤토(organic bentonite modified by hydroxy aluminum,OBA),이제고개성유궤팽윤토(organic bentonite, OB)대Cr(Ⅵ)적흡부능력.탐토료OBA용량、온도화pH치대Cr(Ⅵ)흡부능력적영향,이급OBA대Cr(Ⅵ)적흡부열역학화흡부동역학과정.결과표명,OBA대Cr(Ⅵ)적흡부능력현저고우OB;온도월고,흡부능력월차,최가온도위25 ℃좌우;재산성조건하,pH치대OBA흡부Cr(Ⅵ)적영향교소;재감성조건하,수착pH치제고,기흡부솔강저;OBA대Cr(Ⅵ)적흡부부합Langmuir흡부등온곡선,최대흡부량위14.992 5 mg·g-1;OBA대Cr(Ⅵ)적흡부동역학방정부합위이급동역학방정;OBA흡부Cr(Ⅵ)후가이탈부재생,단시,탈부재생후,Cr(Ⅵ)적흡부능력강저.
Hydroxy aluminum was used to modify organic bentonite to increase it's adsorption of Cr(Ⅵ). Some factors, such as dosage of adsorbent, temperature and pH value which influence Cr(Ⅵ)removal were examined, and adsorption isotherm, adsorption dynamics, desorption and regeneration of OBA to Cr(Ⅵ) were studied. The results show that OBA has higher adsorption capacity than OB. The adsorption capacity of OBA decreases with the increase of temperature, and the optimum temperature is 25℃. The pH value has little influence on adsorption of Cr(Ⅵ) onto OBA in the acid condition, but the adsorption capacity of OBA decreases with the increase of pH value in the alkaline condition. The adsorption isotherms follow Langmuir equation, and the equation is 1/qe=0.136 6/Ce+0.067 (R2=0.992 9), the maximum adsorption capacity is 14.992 5 mg·g-1. The adsorption dynamics follow the pseudo secondary dynamics equation, and the equation ist/qt=0.104t+0.106(R2=0.999). The adsorption capacity of OBA decreases after desorption and regeneration.