污泥与煤共热解制备吸附剂及其对活性艳红X-3B的吸附性能

以污水处理站脱水污泥和煤为原料共热解制备吸附剂，将其用于活性艳红X-3B模拟染料废水的吸附处理.考察了吸附时间，温度，pH及吸附剂投加量对吸附效果的影响，并对其吸附动力学和热力学特性进行了探讨.结果表明:所制备吸附剂的碘吸附值为321.62 mg/g，产率为44.85%，比表面积为189.23 m2>/sup>/g，浸出液中未检测出重金属；吸附剂对活性艳红X-3B的去除率随吸附时间、温度和吸附剂投加量的增加均增大，并逐渐趋于平衡，而随pH的增加而减小；吸附剂对活性艳红X-3B的吸附动力学比较符合伪二级吸附动力学方程和二阶段吸附动力学方程，颗粒内扩散过程是吸附速率的控制步骤，但不是唯一的速率控制步骤；Langmuir等温方程比Freundlich等温方程更适合于描述该吸附行为；吸附焓变(ΔH0>/sup>)>0，吸附是一个吸热过程，提高温度有利于吸附的进行，吸附自由能变(ΔG0>/sup>)<0，吸附过程为自发进行，吸附熵变(ΔS0>/sup>)>0. 

Adsorptive Properties of an Adsorbent to Reactive Brilliant Red X-3B Prepared from Sludge and Coal by Co-Pyrolysis

An adsorbent was prepared by co-pyrolysis from wastewater treatment plant dehydration sludge and coal,and was then used for the adsorption of simulated dye wastewater containing Reactive Brilliant Red X-3B.The influences of adsorption time,temperature,pH and the adsorbent dosage on the adsorption were studied,and the adsorption kinetics and thermodynamics were also discussed.The results indicated that the iodine absorption value of the self-prepared sludge adsorbent was 321.62 mg g,its yield was 44.85%,its specific surface area was 189.23 m2 g,and heavy metals were not detected in the leaching solution.The removal efficiency of Reactive Brilliant Red X-3B by the self-prepared sludge adsorbent increased along with the increase of adsorption time,temperature and the adsorbent dosage,and then the value gradually reached equilibrium.However,the removal efficiency decreased along with the increase of pH.The adsorption kinetics of Reactive Brilliant Red X-3B on the adsorbent was in accordance with the pseudo-second-order kinetics equation and the two-step adsorption kinetics rate equation roughly.Intra-particle diffusion was not the only adsorption rate-controlling step.Compared with the Freundlich isotherm equation,the Langmuir isotherm equation was more appropriate for the adsorption.The adsorption was an endothermic(enthalpy change ΔH0>0) and spontaneous(free energy change ΔG0<0) process with an increase in entropy(ΔS0>0).The increase of the adsorption temperature was helpful to the adsorption.