软锰矿-污泥基活性炭对活性艳红X-3B的吸附特性研究

Study on Dye Adsorptive Characteristics of Activated Carbons from Pyrolusite-added Sewage Sludge

以污水处理厂剩余污泥为原料，添加适量天然软锰矿，采用氯化锌化学活化法制备活性炭，用于吸附活性艳红X-3B染料。结果表明，软锰矿的添加可以改善污泥活性炭的吸附性能，使其对染料的饱和吸附容量（Qm）较未投加软锰矿的污泥活性炭增加50mg／g以上，最大可提高56．5％；软锰矿的投加量因污泥种类而异，控制在0．2％-2％范围内；活性炭的最适宜投加量为4g/L，吸附时间90min，pH值对吸附的影响不大；吸附热力学Langmuir模型比Freundlich模型更适合描述本研究中的等温吸附系统。

Activated carbons were prepared from pyrolusite-added sewage sludge by ZnC12 activation method. Batch adsorption experiments were performed by applying the activated carbons into wastewater of synthetic reactive brilliant red X-3B. The results indicated that the addition of pyrolusite could improve the adsorptive proprties of the activated carbon. The adsorbent concentration and adsorption contact time for the optimum dye-removal were 4 g/L and 90 rain, respectively, while the influence of solution pH value seemed inessential. The adsorption data were better fitted to the Langmuir isotherm than the Freundlich model in the studied dye-adsorbent system. The increase of the maximum adsorption capacity （Qm） by above 50 mg/g demonstrated that the addition of pyrolusite improved the adsorptive characteristics of the sludge-based activated carbons by playing a catalyst role during pyrolysis and adsorption process.