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中文摘要：
研究了树皮原位固化落叶松单宁对水溶液中Cr^6＋的吸附特性。结果表明，Cr^6＋在该吸附剂上的吸附属于氧化还原吸附，即Cr^6＋首先被还原为Cr^3＋，然后被吸附。当温度为303K、pH值2．0、Cr^6＋的初始质量浓度为297．3mg／L时，该吸附材料对Cr^6＋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Cr^6＋的还原反应。该吸附材料对Cr^6＋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Cr^6＋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。
英文摘要：
The adsorption behaviors of Cr^6＋ by in situ immobilized larch tannin were investigated. It was found that the adsorption is characterized by redox adsorption, that is, Cr^6＋ is first reduced into Cr^3＋ and then adsorbed. The adsorption capacity of this adsorbent to Cr^6＋ was 183.6 mg/g at 303 K when initial concentration of Cr^6＋ 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 Cr^6＋ was 2.0 because the reduction of Cr^6＋ is accelerated under acidic condition. The adsorption isotherm of Cr^6＋ 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 Cr^6＋ in adsorption column was around 120 bed volumes when the inlet concentration of Cr^6＋was 232.4 mg/L.
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