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林产化学与工业

林产化学与工业 ›› 2007, Vol. 27 ›› Issue (6): 1-7.

• 研究报告 •    下一篇

原位固化落叶松单宁对Cr(Ⅵ)的氧化还原吸附

侯旭1,2, 廖学品1, 石碧1   

  1. 1. 四川大学 皮革化学与工程教育部重点实验室, 四川 成都 610065;2. 四川大学 分析测试中心, 四川 成都 610065
  • 收稿日期:2007-02-27 修回日期:1900-01-01 出版日期:2007-12-30 发布日期:2007-12-30
  • 通讯作者: 石 碧,长江学者特聘教授,博士生导师,主要研究方向:植物单宁化学;E-mail:sibitannin@vip.163.com。

Redox Adsorption of Cr(Ⅵ) by in Situ Immobilized Larch Tannin

HOU Xu1,2, LIAO Xue-pin1, SHI Bi1   

  1. 1. The Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China;2. The Anlytical Testing Center, Sichuan University, Chengdu 610065, China
  • Received:2007-02-27 Revised:1900-01-01 Online:2007-12-30 Published:2007-12-30

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摘要： 研究了树皮原位固化落叶松单宁对水溶液中Cr6+的吸附特性.结果表明,Cr6+在该吸附剂上的吸附属于氧化还原吸附,即Cr6+首先被还原为Cr3+,然后被吸附.当温度为303K、pH值2.0、Cr6+的初始质量浓度为29.3mg/L时,该吸附材料对Cr6+的平衡吸附量为183.6mg/g,随着温度的升高平衡吸附量增加.pH值对平衡吸附量的影响较大,静态吸附时,产生最大吸附容量的pH值为2.0,这是由于该pH值条件有利于Cr6+的还原反应.该吸附材料对Cr6+的吸附平衡符合Freundlich方程;吸附动力学可以用拟二级速度方程来描述.固定床吸附实验表明,当原料液的Cr6+质量浓度为232.4mg/L,流出液的体积约为120个床层体积时达到穿透点.

关键词: 单宁, 落叶松树皮, 原位固化单宁, 吸附

Abstract: The adsorption behaviors of Cr6+ by in situ immobilized larch tannin were investigated. It was found that the adsorption is characterized by redox adsorption, that is, Cr6+ is first reduced into Cr3+ and then adsorbed. The adsorption capacity of this adsorbent to Cr6+ was 183.6 mg/g at 303 K when initial concentration of Cr6+ was 297.3 mg/L and pH value was 2.0, and the adsorption capacity was increased with the increase of temperature. The optimal pH value for the adsorption of Cr6+ was 2.0 because the reduction of Cr6+ is accelerated under acidic condition. The adsorption isotherm of Cr6+ by in situ immobilized larch tannin can be described by the Freundlich equation. The data of adsorption rate can be well fitted by the pseudo-second-order rate model. The breakthrough point of Cr6+ in adsorption column was around 120 bed volumes when the inlet concentration of Cr6+was 232.4 mg/L.

Key words: tannin, larch bark, in situ immobilized tannin, adsorption

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