秸秆污泥基活性炭的制备及吸附H_2S的实验研究  

Preparation of sludge-straw-based activated carbon and its adsorption of H_2S

作　　者：曾凡[1] 廖筱锋[1] 李勇[1] 何莹[1] 廖利[1] 胡辉[1] ZENG Fan LIAO Xiaofeng LI Yong HE Ying LIAO Li HU Hui(College of Environmental Science and Engineering, Huazhong University of Science and Technology,Wuhan 43007)

机构地区：[1]华中科技大学环境科学与工程学院,武汉430074

出　　处：《环境科学学报》2017年第11期4269-4276,共8页Acta Scientiae Circumstantiae

基　　金：国家科技支撑计划(No.2012BAC18B02)~~

摘　　要：以市政污泥和玉米秸秆的混合物为原材料,KOH为活化剂,制备了秸秆污泥基活性炭(AC).实验考察了秸秆与污泥用量比例,以及活化剂用量对秸秆污泥基活性炭物化特性的影响.结果显示,m(污泥)∶m(秸秆)∶m(KOH)为3∶7∶2的条件下,制备的活性炭C372以微孔为主,微孔率达到0.59,比表面积达到369.271 m2·g-1.该活性炭的穿透硫容与饱和硫容均最高,分别为5.82 mg·g-1(以H2S计)和7.00 mg·g-1(以H2S计),活性炭表面内酯基的存在不利于其对硫化氢的吸附.SEM和BET表征分析显示,随着秸秆在污泥中比例的增加,活性炭比表面积增大,对H2S的吸附量提高.活性炭C372具有较好的再生性能,二次再生后其穿透硫容与饱和硫容均能恢复55%以上.Sewage sludge and corn straw were used to prepare sludge-straw activated carbon（ AC） by pyrolysis with KOH. This study investigated the effects of mixing ratio（ sludge/straw） and the amount of KOH on physical and chemical properties of the sludge-straw activated carbon. The activated carbon named C372 was prepared with the mixing ratio of sludge ∶ straw ∶ activator of 3∶7∶2. The microporosity of the C372 was up to 0.59,and the specific surface area reached 369. 271 m^2·g^-1. The experimental results showed that activated carbon C372 had the highest breakthrough sulfur capacity and saturated sulfur capacity of 5.82 and 7.00 mg H2 S per gram AC,respectively. The presence of the lactone groups on the activated carbon was not conducive to its adsorption to H2 S. The SEM and BET characterization analysis showed that the specific surface area of activated carbon increased as the increase of the proportion of straw in the raw material and the ACs＇ adsorption capacity of H2 S. Activated carbon C372 has good regeneration performance,and the breakthrough sulfur capacity and saturated sulfur capacity can be restored more than 55% after the second cycle.

关 键 词：市政污泥 玉米秸秆 活性炭 脱硫性能 

分 类 号：X701.3[环境科学与工程—环境工程]