摘要
研究2种人工合成的铁氧化物对磺酰脲类除草剂———苄嘧磺隆(bensulfuron-methyl,BSM)的吸附,以及Zn2+对供试样品吸附苄嘧磺隆的影响。实验结果表明,用Langmuir、Freundlich、Temkin等方程对供试样品加入Zn2+后吸附BSM的数据进行了拟合,发现供试样品吸附苄嘧磺隆的等温曲线较好地符合Freundlich方程。加入Zn2+后,铁氧化物吸附苄嘧磺隆的量较未加Zn2+有较大幅度的增加,但在苄嘧磺隆的平衡质量浓度较低(<4 mg/L)时,氧化物吸附苄嘧磺隆的量不随Zn2+浓度的增加而增加;在苄嘧磺隆的平衡质量浓度较高(>6mg/L)时,氧化物吸附苄嘧磺隆的量随Zn2+浓度的增加而增加。这可能是Zn2+和苄嘧磺隆被吸附时存在竞争和协同交互作用的结果。
The present paper aims to introduce the authors＇ research on the two kinds of synthesized iron oxides--goethite and hematite and their adsorption of bensulfuron-methyl （BSM） by using the batch equilibration technique. At the same time, the effect of Zn^2 ＋ on BSM adsorption has also been investigated. The results show that goethite and hematite have a certain adsorption power on BSM, and the adsorption isothermal data of BSM at the presence of Zn^2＋ have also been described with Langmuir, Freundlich and Temkin equations, while making a comparison with the three equations with the Freundlich equation being the optimal one. When Zn^2＋ were added to the solution, the adsorption power for BSM proves to be higher than that in absence of Zn^2＋ . As long as the equilibrium concentration of BSM remains low （ 〈 4 mg/L）, the higher the concentration of BSM, the lower the BSM＇s adsorption power. However, when the concentration of BSM becomes higher （ 〉 6 mg/L）, the higher the concentration of Zn^2 ＋ , the greater the increase of BSM in goethite and hematite. There may exist some contradictory and complementary mechanisms between Zn^2 ＋ and BSM in different conditions. That is the interaction existing in some metal and organic substances.
出处
《安全与环境学报》
CAS
CSCD
2006年第4期20-22,共3页
Journal of Safety and Environment
关键词
环境工程
铁氧化物
苄嘧磺隆
吸附
ZN^2+
交互作用
environmental engineering
iron oxides
bensulfuronmethyl
adsorption
Zn^2＋
interaction
