污泥活性炭对活性艳红K-2BP染料的吸附特性研究

以城市污水处理厂脱水污泥作为原料，采用化学活化法（ZnCl₂作为活化剂）制得污泥活性炭，并将其用于吸附活性艳红K-2BP染料.考察了吸附剂投加量、吸附时间和pH值对吸附效果的影响，并对其吸附动力学和热力学特性进行了探讨. 结果表明，所制得的污泥活性炭的碘吸附值为326mg^.g^-1，产率为51.31%，BET比表面积为298m^2.g^-1，具有中孔性和开放的孔结构，浸出液重金属含量不超标；污泥活性炭对活性艳红K-2BP的吸附动力学符合二阶段吸附速率方程和伪二级动力学方程；此吸附为优惠吸附，Langmuir等温方程比Freundlich等温方程更适合于描述此吸附行为；此吸附是一个吸热过程（吸附焓ΔH>0），提高温度有利于吸附的进行，吸附自发进行（吸附自由能ΔG<0），吸附熵ΔS总是正值.

Adsorptive properties of sludge activated carbon to Brilliant Red K-2BP

Sludge activated carbon was prepared from municipal wastewater treatment plant sludge by chemical activation with ZnCl₂ as an activation reagent, which was used for the adsorption of dye (Reactive Brilliant Red K-2BP). The influences of the adsorbent amount, adsorption time and pH value on adsorption effect were studied . The adsorption kinetics, and the adsorption thermodynamics were discussed. The results indicate that sludge activated carbon is mesoporous and has an opened porous structure. The iodine absorption value of sludge activated carbon is 326mg^.g^-1, the yield is 51.31%, the BET surface area is 298m^2.g^-1，and the content of metal elements in the lixivium is lower than the limit. The adsorption kinetics of Reactive Brilliant Red K-2BP the sludge activated carbon accords with the two-step adsorption kinetics rate equation and pseudo-second-order kinetics equation. Compared to the Freundlich isotherm equation, the Langmuir isotherm equation is more appropriate to the adsorption. The ads orption is an endothermic (enthalpy ΔH>0) and spontaneous (free energy ΔG<0) process, with an increase in entropy (ΔS>0).