载铁活性炭吸附剂的制备及除砷(Ⅲ)性能研究

Research on the preparation of iron-containing activated carbon adsorbent and its As(Ⅲ) removing capacity

考察了载铁活性炭制备过程中铁盐种类、铁盐浓度、熟化温度对载铁活性炭吸附砷性能的影响，得出最佳制备条件为0．8mol／L氯化铁浸渍、60℃熟化。静态吸附实验表明，载铁活性炭对As（Ⅲ）的吸附去除率明显高于活性炭，吸附等温线更符合Langmuir模型，为单分子层吸附。当pH为7~10时，载铁活性炭对As（Ⅲ）的去除率在70％以上，当pH=8时，As（Ⅲ）去除率高达90．48％。再生实验表明，此吸附剂具有良好的可再生性能。

The effects of the classes and concentrations of ferric salts, and curing temperature in the process of iron- containing granular activated carbon preparation on the adsorbing capacity for As （m） by using iron-containing acti- vated carbon have been investigated. The optimal preparation conditions are as follows：0.8 mol/L of FeCl3 dipping, and 60 ℃ curing. The static adsorption experiments show that the adsorbing removing rate for As （Ⅲ） by using iron- containing activated carbon is remarkably higher than that by using activated carbon. Being mono-layer molecule ad- sorption, the adsorption isotherm is more in accordance with Langmuir model. When its pH is 7-10 ,the As（ Ⅲ ） ad- sorption rate by using iron-containing activated carbon is above 70% ; when its pH is 8, the As （ Ⅲ ） removing rate is as high as 90.48%. The renewable experiment shows that this adsorbent has pretty good renewable performance.