CAJ | 학술논문

采用Langmuir和Freundlich模型线性拟合方法研究了金鱼藻（Ceratophyllum demersum ）对Cr6＋的吸附等温线，分析了2种模型的拟合效果和适用性，结果表明：采用不同等温吸附模型评价植物对重金属的吸附时，根据拟合参数 R2进行适用性判断并不准确，在实践中应结合实测数据与拟合模型重新计算获得的数据进行比较，并根据吸附反应本身的特点进行综合判断选择合适的吸附模型；沉水植物金鱼藻吸附Cr6＋的行为在平衡质量浓度较低（ce＜0．2mg/L）时，Freundlich模型拟合的效果更符合客观实际；在平衡质量浓度较高（ce＞0．2mg/L ）时，两种模型的拟合效果基本重合，均和实测数据较为吻合；根据Langmuir模型线性拟合参数，沉水植物金鱼藻对C r6＋的最大吸附量为1．5142×10-2 m g/g。
채용Langmuir화Freundlich모형선성의합방법연구료금어조（Ceratophyllum demersum ）대Cr6＋적흡부등온선，분석료2충모형적의합효과화괄용성，결과표명：채용불동등온흡부모형평개식물대중금속적흡부시，근거의합삼수 R2진행괄용성판단병불준학，재실천중응결합실측수거여의합모형중신계산획득적수거진행비교，병근거흡부반응본신적특점진행종합판단선택합괄적흡부모형；침수식물금어조흡부Cr6＋적행위재평형질량농도교저（ce＜0．2mg/L）시，Freundlich모형의합적효과경부합객관실제；재평형질량농도교고（ce＞0．2mg/L ）시，량충모형적의합효과기본중합，균화실측수거교위문합；근거Langmuir모형선성의합삼수，침수식물금어조대C r6＋적최대흡부량위1．5142×10-2 m g/g。
In this study ,model linear fitting methods of Langmuir and Freundlich are carried out to investiga-tethe Cr6+ adsorption isotherms to Ceratophyllum demersum .And then the results and applicabilities of the two models are compared .The results show that :(1)When using different adsorption isotherm models to e-valuate the absortion of metals by plants ,it is not accurate to use the fitting parameters R2 to judge the ap-plicability .In practice ,it should compare the measured dates and the dates re -calculated with the fitting model ,and also should take a comprehensive judgement to choose the most suitable model ;(2)Submerged plant Ceratophyllum's adsorption behaviors at the lower (ce<0 .2mg/l) Cr6+ equilibrium concentrations are more in line with the realities by using Freundlich model .When the equilibrium concentrations are higher (ce>0 .2mg/l) ,the two models are coincidence with the fitting results ,they both are in line with the measured dates ;(3)According to the Langmuir model linear regression parameters ,the maximum adsorption of sub-merged plant Ceratophyllum to Cr6+ is 1 .5142 × 10-2 mg/g .