污泥基活性炭制备改性及其吸附甲苯性能

doi:10.16085/j.issn.1000-6613.2019-2076

摘要/Abstract

摘要：

以石化企业干化剩余活性污泥为炭源前体、ZnCl₂溶液为活化剂，在613℃条件下炭化70min制得了碘值为683.40mg/g、产率为55.5%的污泥基活性炭（SAC，sludge-based activated carbon）样品，并进一步利用不同浓度的HNO₃、H₂SO₄和H₂O₂溶液为改性剂对SAC氧化改性，通过碘值测定、BET、Boehm滴定、ICP、FTIR、XRD、SEM、TEM等手段对改性前后SAC样品进行了表征分析和对比研究。结果表明，HNO₃和H₂SO₄改性后SAC的BET比表面积、孔容、碘值均明显增加，可有效提高SAC吸附性能，当HNO₃浓度为0.5mol/L、H₂SO₄浓度为1.0mol/L时改性效果最好，动态吸附甲苯的吸附量较改性前分别提高了38.80%和27.19%，吸附穿透时间也明显延长；而对于H₂O₂溶液为改性剂，总体上不利于SAC吸附性能的提高。对甲苯吸附效果最好的几种改性SAC材料进行再生性能测试，均展现了良好的再生循环利用性能。

关键词: 石化企业, 剩余活性污泥, 污泥基活性炭, 制备改性, 甲苯吸附

Abstract:

The sample of sludge-based activated carbon (SAC) with iodine value of 683.40mg/g and yield of 55.5% was prepared by using the dried activated sludge from petrochemical enterprises as carbon source and ZnCl₂ solution as activator. The carbonization condition was 613℃ and 70min. HNO₃, H₂SO₄ and H₂O₂solutions with different concentrations were used to modify the properties of obtained SAC. Iodine value, BET, Boehm titration, ICP, FT-IR, XRD, SEM and TEM were used to characterize different SAC samples. The results indicated that the BET surface area, pore volume, iodine value of SAC increased obviously after modification of HNO₃ and H₂SO₄, which could enhance the SAC’s adsorption ability efficiently. When the concentrations of HNO₃ and H₂SO₄ were 0.5mol/L and 1.0mol/L, the modification effects to SAC were better than other concentration conditions. Compared to original SAC， the adsorption amounts of toluene increased by 38.80% and 27.19%, respectively and the adsorption penetration time extended. But the modifiers of H₂O₂ solution were not favorable to the modification of SAC. Finally, the regeneration abilities of modified SAC were tested and the modified SAC displayed excellent abilities of recycling utilization.

Key words: petrochemical enterprises, excess activated sludge, sludge-based activated carbon, preparation and modification, toluene adsorption

中图分类号:

X705

李石, 邢亚彬, 孙慧, 杜改平, 戴安国, 赵东风. 污泥基活性炭制备改性及其吸附甲苯性能[J]. 化工进展, 2020, 39(6): 2463-2471.

Shi LI, Yabin XING, Hui SUN, Gaiping DU, Anguo DAI, Dongfeng ZHAO. Preparation and modification of sludge based activated carbon and their performance of toluene adsorption[J]. Chemical Industry and Engineering Progress, 2020, 39(6): 2463-2471.

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