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林产化学与工业 ›› 2019, Vol. 39 ›› Issue (4): 56-64.doi: 10.3969/j.issn.0253-2417.2019.04.008

• 研究报告 • 上一篇    下一篇

污泥与杨木屑共热解焦制活性炭及其废水处理应用

吴少基(),江坤,叶跃元,刘运权*(),王夺,李水荣   

  1. 厦门大学 能源学院, 福建 厦门 361102
  • 收稿日期:2019-02-26 出版日期:2019-08-25 发布日期:2019-08-23
  • 通讯作者: 刘运权 E-mail:wushaojixmu@163.com;yq_liu@xmu.edu.cn
  • 作者简介:吴少基(1994-),男,湖南岳阳人,硕士生,研究方向为生物质热解技术; E-mail:wushaojixmu@163.com
  • 基金资助:
    福建省经信委2016年省级企业技术创新专项资金(闽经信计财[2016]411)

Preparation of Activated Carbon from Co-pyrolysis Char of Sewage Sludge and Poplar Sawdust and Its Application in Wastewater Treatment

Shaoji WU(),Kun JIANG,Yueyuan YE,Yunquan LIU*(),Duo WANG,Shuirong LI   

  1. College of Energy, Xiamen University, Xiamen 361102, China
  • Received:2019-02-26 Online:2019-08-25 Published:2019-08-23
  • Contact: Yunquan LIU E-mail:wushaojixmu@163.com;yq_liu@xmu.edu.cn
  • Supported by:
    福建省经信委2016年省级企业技术创新专项资金(闽经信计财[2016]411)

摘要:

以污泥-杨木屑共热解焦为原料,经KOH化学活化法制备了活性炭。对所得的活性炭进行了表征,结果表明:制得的活性炭以微孔为主,BET比表面积可达551.0 m2/g,总孔容达0.294 cm3/g。以苯酚作为含酚废水模型化合物的吸附应用研究表明,当苯酚溶液初始质量浓度为50 mg/L时,活性炭的添加量以1.75 g/L为宜,此时苯酚去除率可达80.6%;实验还发现pH值5的弱酸性对于该活性炭吸附苯酚效果最佳。对实验数据进行关联表明该活性炭吸附苯酚的过程符合准二级动力学模型;且其等温吸附曲线可用Langmuir模型关联。热力学研究表明ΔHΘ、ΔSΘ均小于零,且ΔGΘ介于-0.383~-0.109 J/mol之间,说明此活性炭对苯酚的吸附是自发的、放热的、熵减过程,且以物理吸附为主。

关键词: 污泥, 共热解焦, 活性炭, 废水处理, 吸附动力学, 吸附等温线

Abstract:

The co-pyrolysis chars of sewage sludge and poplar sawdust were activated by using KOH chemical activation method to produce activated carbons(AC). The physical properties of obtained activated carbons were characterized. It was found that the surface area of activated carbon reached 551.0 m2/g and the total pore volume was 0.294 cm3/g, and most of pores were microporous.The phenol-adsorption experiments indicated that the activated carbon was very effective in removing phenols when phenol solution was used as the model of phenol-containing wastewater. It was also found that the phenol removal rate of 80.6%was achieved at the AC addition ratio of 1.75 g/L when the mass concentration of phenol solution was 50 mg/L.Furthermore, the adsorption of phenols could be enhanced at weakly acidic condition of pH 5. Finally, the fitting of experimental data showed that the adsorption of phenols with the prepared AC could be described by pseudo-second order kinetic law, while its adsorption isotherm could be simulated with the Langmuir model.Thermodynamic study showed that ΔHΘ and ΔSΘ were negative, and ΔGΘ ranged from -0.383 to -0.109 J/mol, indicating that the adsorption of phenol was a spontaneous, exothermic, entropy-decreasing, and physical-adsorption dominant process.

Key words: sewage sludge, co-pyrolysis char, activated carbon, wastewater treatment, adsorption kinetics, adsorption isotherm

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