Journal ArticleDOI
Degradation of aniline with zero-valent iron as an activator of persulfate in aqueous solution
Reads0
Chats0
TLDR
In this paper, the effects of different parameters such as pH, ZVI concentration, aniline concentration, persulfate concentration, and reaction temperature on anilines degradation were investigated under laboratory conditions.Abstract:
Zero valent iron (ZVI) can activate persulfate to generate sulfate free radicals which are a strong oxidant to degrade organic pollutants. The oxidative degradation of aniline in aqueous solution by persulfate activated with zero valent iron was studied under laboratory conditions. Batch experiments were conducted to investigate the effects of different parameters such as pH, ZVI concentration, aniline concentration, persulfate concentration and reaction temperature on aniline degradation. The results showed that aniline degradation increased with increasing temperature. The optimum dosage of ZVI was 0.4 g L−1 and 85% aniline degradation was observed. Maximum aniline degradation was observed at pH 4.0, whereas at pH above or below 4.0, aniline degradation efficiency was decreased. In the persulfate-ZVI system, the apparent energy of activation for aniline degradation was 14.85 kJ mol−1. The existence of persulfate radicals and hydroxyl radicals produced during the degradation of aniline were identified with scavenger ethanol and tert-butyl alcohol. The reaction intermediates nitrobenzene, nitroso-benzene and p-benzoquinone were detected by gas chromatography-mass spectrometry and based on these intermediates obtained a probable pathway for aniline degradation has been proposed.read more
Citations
More filters
Journal ArticleDOI
Activated persulfate for organic chemical degradation: A review.
TL;DR: An extensive review of recently published experimental parameters and results for the destruction of organic compounds via activated persulfate is presented, and focus is placed on emerging methodologies and manipulation of traditional activation techniques.
Journal ArticleDOI
Mechanistic insight into reactivity of sulfate radical with aromatic contaminants through single-electron transfer pathway
Shuang Luo,Zongsu Wei,Dionysios D. Dionysiou,Richard Spinney,Wei-Ping Hu,Liyuan Chai,Zhihui Yang,Tiantian Ye,Ruiyang Xiao +8 more
TL;DR: In this paper, the first step of SET reactions for 76 aromatic contaminants (ACs) with SO4 − was investigated, and it was shown that the Gibbs free energy ( Δ G SET ∘ ) of the reaction increases with a decrease of the electron donating character of the substituents on the ACs.
Journal ArticleDOI
Insights into the mechanism of persulfate activation with nZVI/BC nanocomposite for the degradation of nonylphenol
Imtyaz Hussain,Imtyaz Hussain,Mingyu Li,Yongqing Zhang,Yongqing Zhang,Yichun Li,Shaobin Huang,Shaobin Huang,Xiaodong Du,Guoqiang Liu,Waseem Hayat,Nazia Anwar +11 more
TL;DR: In this article, a nanoscale zero-valent iron (nZVI) supported on biochar (BC) nanocomposite was synthesized using low-cost rice husk through reduction of ferrous iron with sodium borohydride as a reductant under nitrogen atmosphere.
Journal ArticleDOI
Activation of Persulfate by Nanosized Zero-Valent Iron (NZVI): Mechanisms and Transformation Products of NZVI.
TL;DR: Iron speciation analysis (including X-ray absorption spectroscopy) results indicated that a shrinking core/growing shell model explained NZVI transformation during the persulfate/NZVI process.
Journal ArticleDOI
Design and application of heterogeneous catalysts as peroxydisulfate activator for organics removal: An overview
Wen-Da Oh,Teik-Thye Lim +1 more
TL;DR: In this article, a review of recent advancement in the development of metal and carbon-based catalysts for peroxydisulfate (PDS) activation is provided. But, the sustainability of metal-based catalyst as PDS activator is contentious due to metal leaching during application, and various strategies have been employed to address this issue.
References
More filters
Journal ArticleDOI
Radical generation by the interaction of transition metals with common oxidants.
TL;DR: Nine transition metals were tested for the activation of three oxidants and the generation of inorganic radical species such as sulfate, peroxymonosulfate, and hydroxyl radicals to postulate the rate-determining step of the redox reactions taking place when a metal is coupled with an oxidant in aqueous solution.
Journal ArticleDOI
Mechanism of base activation of persulfate.
TL;DR: The results of this research are consistent with the widespread reactivity reported for base-activated persulfate when it is used for ISCO.
Journal ArticleDOI
Sulfate radical-based ferrous-peroxymonosulfate oxidative system for PCBs degradation in aqueous and sediment systems
TL;DR: In this article, the degradation of polychlorinated biphenyls (PCBs) using sulfate radical-based advanced oxidation processes (SR-AOPs) was investigated.
Journal ArticleDOI
The Chemistry of Persulfate. I. The Kinetics and Mechanism of the Decomposition of the Persulfate Ion in Aqueous Medium1
I. M. Kolthoff,I. K. Miller +1 more
Journal ArticleDOI
Influence of pH on persulfate oxidation of TCE at ambient temperatures.
TL;DR: P pH should be monitored and adjusted to near neutral if necessary in a field application of ISCO, and radical scavenging tests used to identify predominant radical species suggested that the sulfate radical (SO(4)(.-)) predominates under acidic conditions and the hydroxyl radical (.OH) predominate under basic conditions.