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pH值和离子对诺氟沙星在胡敏酸上吸附特征的影响
  • ISSN号:1000-6923
  • 期刊名称:《中国环境科学》
  • 时间:0
  • 分类:X131.3[环境科学与工程—环境科学]
  • 作者机构:[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008, [2]中国科学院南京土壤研究所-香港浸会大学土壤与环境联合开放实验室,江苏南京210008, [3]中国科学院研究生院,北京100049
  • 相关基金:国家自然科学基金资助项目(40671093 20707029); 国家“973”项目(2007CB936604)
中文摘要:

根据OECD Guideline 106批平衡实验,研究了pH值、Ca2+浓度和离子类型对诺氟沙星在胡敏酸上吸附特征的影响.结果表明,吸附系数(Kd)随着pH值的增大有先增加后减小的趋势,在pH 4.0和pH 6.0时吸附系数较大.红外光谱表明,pH 3.0有利于诺氟沙星和胡敏酸形成氢键;pH6.0和7.0时胡敏酸的羧基可能与诺氟沙星的氨基形成了肽键.诺氟沙星在胡敏酸上的吸附量和Kd值随着溶液中Ca2+离子浓度的增加而逐渐减小,表明两者之间存在阳离子吸附和竞争吸附.不同类型的阳离子和阴离子的加入都能导致诺氟沙星在胡敏酸的吸附特性存在差异.阳离子的影响趋势主要为价态的影响,即价态越高,在胡敏酸表面吸附位点的吸附能力就越强,对诺氟沙星吸附阻碍作用越显著,表现在诺氟沙星的最大吸附量(Qm)为:M+(Na+、K+、NH4+)〉M2+(Mg2+、Ca2+、Zn2+);其次受阳离子的离子半径和水解作用的影响.而只有能水解的阴离子才能对诺氟沙星在胡敏酸上的吸附产生明显的阻碍作用.

英文摘要:

The influences of pH,concentrations of Ca2+,and ion types on sorption characteristics of norfloxacin(Nor) on humic acid(HA) were investigated by batch equilibrium studies according to OECD Guideline 106.Sorption coefficient(Kd) tended to increase with pH increasing in the range of 3.0~4.0,but to decrease as pH increase in the range of 6.0~7.0.The Kd values had two peaks at pH 4.0 and 6.0 than those at other tested pH values.The FTIR spectra of HA before and after hydrogen bonds were favorably formed at pH 3.0 between HA and Nor,while peptide bonds were likely formed between carboxyl group of HA and amino group of Nor at pH 6.0 and 7.0.The Kd values and sorption amounts of Nor gradually decreased with the increasing concentration of Ca2+,indicating that the cation exchange and completion sorption occurred between Nor and Ca2+.Addition of different cations and anions in solution led to different sorption characteristics of Nor.The valencies of different cations played the dominating role in affecting the sorption of Nor on HA.The higher valencies cations,the more strongly cations were adsorbed on surface sorption sites of HA,resulting in the following order of the maximum sorption amounts(Qm) for Nor: M+(Na+、K+、NH4+) M2+(Mg2+、Ca2+、Zn2+).On the other hand,the radius and the hydrolysis of cations could also influence the sorption of Nor.The inhibition effect of anions on Nor sorption became pronounced when the hydrolytic anions were added in solution.

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期刊信息
  • 《中国环境科学》
  • 中国科技核心期刊
  • 主管单位:中国科协
  • 主办单位:中国环境科学学会
  • 主编:王文兴
  • 地址:北京市海淀区红联南村54号
  • 邮编:100082
  • 邮箱:zghjkx1981@126.com
  • 电话:010-62215145
  • 国际标准刊号:ISSN:1000-6923
  • 国内统一刊号:ISSN:11-2201/X
  • 邮发代号:2-572
  • 获奖情况:
  • 国家期刊提名奖,国家“双效”期刊,第三届中国科协优秀科技期刊一等奖
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘(网络版),英国农业与生物科学研究中心文摘,波兰哥白尼索引,荷兰文摘与引文数据库,美国工程索引,美国剑桥科学文摘,英国科学文摘数据库,英国动物学记录,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:47702