SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (10): 2689-2698.DOI: 10.1016/j.cjche.2020.06.039

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Adsorptive removal of tetracycline from water using Fe (III)-functionalized carbonized humic acid

Dairui Xie1, Hongcheng Zhang1, Meng Jiang1, Hao Huang1, Heng Zhang1, Yang Liao1, Shilin Zhao1,2   

  1. 1 College of Chemistry and Material Science, Sichuan Normal University, Chengdu 610068, China;
    2 Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education of China, Chengdu 610068, China
  • 收稿日期:2020-04-14 修回日期:2020-06-15 出版日期:2020-10-28 发布日期:2020-12-03
  • 通讯作者: Shilin Zhao
  • 基金资助:
    This research was financially supported by the National Natural Science Foundation of China (No.51641209).

Adsorptive removal of tetracycline from water using Fe (III)-functionalized carbonized humic acid

Dairui Xie1, Hongcheng Zhang1, Meng Jiang1, Hao Huang1, Heng Zhang1, Yang Liao1, Shilin Zhao1,2   

  1. 1 College of Chemistry and Material Science, Sichuan Normal University, Chengdu 610068, China;
    2 Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education of China, Chengdu 610068, China
  • Received:2020-04-14 Revised:2020-06-15 Online:2020-10-28 Published:2020-12-03
  • Contact: Shilin Zhao
  • Supported by:
    This research was financially supported by the National Natural Science Foundation of China (No.51641209).

摘要: Humic acid (HA) was carbonized at 300, 400 and 500 ℃ and then functionalized with 1 wt%-12 wt% Fe(III) respectively [CHA300/400/500-Fe(III)]. Adsorption of such Fe(III)-functionalized carbonized HA as adsorbents to aqueous tetracycline (TC: 25 mg·L-1) was studied. The adsorption equilibrium time for CHA400-Fe(III) to TC was 6 h faster and the adsorption removal efficiency (Re) was two times higher than that of HA/CHA. The adsorption R e of CHA400-Fe(III) loaded 10% iron [CHA400-(10%)Fe(III)] to TC could reach 99.8% at 8 h and still kept 80.6% after 8 cycles. The adsorption kinetics were well fitted to the pseudo-second-order equation and the adsorption isotherms could be well delineated via Langmuir equations(R2 > 0.99), indicating that the homogeneous chemical adsorption of TC occurred on the adsorbents. The main adsorption mechanisms of TC were complexation Fe(III) and hydrophobic distribution. Electropositive and electronegative repulsion between TC and CHA400-(10%)Fe(III) at lowly pH(2) and highly pH(8-10) respectively, leaded to the relatively low adsorption capacity and more notable influence of ion concentration. When the pH was between 4 and 8, TC mainly existed in neutral molecules (TCH2), so the influence of ion concentration was not obvious. The dynamic adsorption results showed that the CHA400-(10%)Fe(III) could continuously treat about 2.4 L TC(27 mg·L-1) wastewater with the effluent concentration as low as 0.068 mg·L-1. Our study suggested a broad application prospect of a new, effective, lowcost and environment-friendly adsorbent CHA400-(10%)Fe(III) for treatment of low-concentration TC polluted wastewater.

关键词: Fe(III)-functionalized carbonized humic acid, Composites, Adsorption, Low-concentration tetracycline, Waste water

Abstract: Humic acid (HA) was carbonized at 300, 400 and 500 ℃ and then functionalized with 1 wt%-12 wt% Fe(III) respectively [CHA300/400/500-Fe(III)]. Adsorption of such Fe(III)-functionalized carbonized HA as adsorbents to aqueous tetracycline (TC: 25 mg·L-1) was studied. The adsorption equilibrium time for CHA400-Fe(III) to TC was 6 h faster and the adsorption removal efficiency (Re) was two times higher than that of HA/CHA. The adsorption R e of CHA400-Fe(III) loaded 10% iron [CHA400-(10%)Fe(III)] to TC could reach 99.8% at 8 h and still kept 80.6% after 8 cycles. The adsorption kinetics were well fitted to the pseudo-second-order equation and the adsorption isotherms could be well delineated via Langmuir equations(R2 > 0.99), indicating that the homogeneous chemical adsorption of TC occurred on the adsorbents. The main adsorption mechanisms of TC were complexation Fe(III) and hydrophobic distribution. Electropositive and electronegative repulsion between TC and CHA400-(10%)Fe(III) at lowly pH(2) and highly pH(8-10) respectively, leaded to the relatively low adsorption capacity and more notable influence of ion concentration. When the pH was between 4 and 8, TC mainly existed in neutral molecules (TCH2), so the influence of ion concentration was not obvious. The dynamic adsorption results showed that the CHA400-(10%)Fe(III) could continuously treat about 2.4 L TC(27 mg·L-1) wastewater with the effluent concentration as low as 0.068 mg·L-1. Our study suggested a broad application prospect of a new, effective, lowcost and environment-friendly adsorbent CHA400-(10%)Fe(III) for treatment of low-concentration TC polluted wastewater.

Key words: Fe(III)-functionalized carbonized humic acid, Composites, Adsorption, Low-concentration tetracycline, Waste water