Synthesis of Carbon Nanotubes/FeS Fenton-like Catalyst and Its Catalytic Properties†

doi:10.7503/cjcu20131078

Abstract

Abstract:

Chemical vapor deposition(CVD) was used to fabricate as-prepared multi-walled carbon nanotubes(CNTs). CNTs/FeS Fenton-like catalyst was synthesized by oxidation-reduction-vulcanization method. Furthermore, The catalyst was characterized by TEM, XRD, TG and other material analysis techniques. And then, the catalyst was used for the removal of ciprofloxacin from aqueous solution. The catalytic activity and catalytic mechanism were studied with concentration of H₂O₂, dosage of catalyst, concentration of ciprofloxacin and pH. The results show that there are an optimal H₂O₂ concentration(20 mmol/L) and dosage of catalyst(10 mg) in CNTs/FeS Fenton-like catalytic reaction. The first order kinetics equation is more appropriate to describe the process of catalytic reaction. And the catalytic reaction has better suitability than previsous study in wide range of pH values(pH=3—8). Meanwhile, CNTs/FeS Fenton-like catalyst has good regenerated properties.

Key words: Carbon nanotubes, Fenton-like, Catalysis, Hydroxyl radicals, Ciprofloxacin

CLC Number:

O643

TrendMD:

YANG Mingxuan, MA Jie, SUN Yiran, XIONG Xinzhu, LI Chenlu, LI Qiang, CHEN Junhong. Synthesis of Carbon Nanotubes/FeS Fenton-like Catalyst and Its Catalytic Properties^†[J]. Chem. J. Chinese Universities, 2014, 35(3): 570.

Figures/Tables 10

Fig.1 TEM images of CNTs/FeS catalyst

Fig.2 Raman spectra of APCNTs(a) and CNTs/FeS catalyst(b)

Fig.3 XRD patterns of APCNTs(a), CNTs/FeS(b) and CNTs/FeS-R5(c) catalysts

Fig.4 Thermal analysis of CNTs/FeS catalyst

Fig.5 Effects of H2O2 dose on ciprofloxacin removal ratec(H2O2)=10—100 mmol/L[14]; c(ciprofloxacin)=150 mg/L.

Fig.6 Effects of ciprofloxacin concentration on ciprofloxacin removal ratec(H2O2)=20 mmol/L; c(ciprofloxacin)=20—250 mg/L.

Fig.7 Effects of CNTs/FeS catalyst dosage on ciprofloxacin removal ratec(H2O2)=20 mmol/L; c(ciprofloxacin)=150 mg/L.

Fig.8 Effects of pH on ciprofloxacin removal ratec(H2O2)=20 mmol/L; c(ciprofloxacin)=150 mg/L.

Fig.9 Kinetics of ciprofloxacin decomposition CNTs/FeS catalyst Fenton-like systemc(H2O2)=20 mmol/L; c(ciprofloxacin)=100 mg/L.

Fig.10 Results of CNTs/FeS catalyst life testc(H2O2)=20 mmol/L; c(ciprofloxacin)=150 mg/L.

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