期刊
ENVIRONMENTAL TECHNOLOGY
卷 40, 期 20, 页码 2671-2683出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2018.1449899
关键词
Laterite; herbicides; iron nanoparticles; Fenton-like process; Tectona Grandis
资金
- MHRD Govt. of India
In this work, low cost, locally available laterite-based iron nanoparticles were synthesized using Tectona Grandis extract (Teak extract) with an average size of 75nm. The synthesized FeNPs were applied as a heterogeneous Fenton catalyst for the oxidation of mixture herbicides, namely ametryn, dicamba and 2,4-D in water. The FeNPs were characterized for various analytical methods (field emission scanning electron microscopy-X-ray energy-dispersive spectrophotometer, XRD, FTIR and BET) and the effect of different variables (FeNPs dosage, H2O2, pH) was studied using the responses surface methodology. The initial herbicide concentration was considered as 25, 3.5 and 94mgL(-1) for 2,4-D, ametryn and dicamba, respectively, with the COD value of 172mgL(-1). The 100% degradation and mineralization was achieved in 135min and >85% in 45min (optimum dosage: FeNPs=25.29mgL(-1), H2O2=430mgL(-1) and pH=5). The degradation kinetics were performed for both pseudo-first order and second order, it was observed that first-order kinetics (R-2>0.85) was well fitted in the treatment process. Recycling of FeNPs in five cycles was performed at optimum conditions and 10-40% of reduction in degradation efficiency was achieved. Finally, the whole treatment process was validated with a contour overlay plot and analysis of variance.
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