Radicals induced from peroxomonosulfate by nanoscale zero-valent copper in the acidic solution.

A highly efficient advanced oxidation process for the degradation of benzoic acid (BA) during activation of peroxomonosulfate (PMS) by nanoscale zero-valent copper (nZVC) in acidic solution is reported. BA degradation was almost completely achieved after 10 min in the nZVC/PMS process at initial pH 3.0. PMS could accelerate the corrosion of nZVC in acidic to release Cu+ which can further activate PMS to produce reactive radicals. Both sulfate radical (SO4-•) and hydroxyl radical (•OH) were considered as the primary reactive oxidant in the nZVC/PMS process with the experiments of methyl (MA) and tert-butyl alcohol quenching. Acidic condition (initial pH ≤ 3.0) facilitated BA degradation and pH is a decisive factor to affect the oxidation capacity in the nZVC/PMS process. Moreover, BA degradation in the nZVC/PMS process followed the pseudo-first-order kinetics, and BA degradation efficiency increased with the increase of the nZVC dosage.

[1]  George P. Anipsitakis,et al.  Radical generation by the interaction of transition metals with common oxidants. , 2004, Environmental science & technology.

[2]  P. Neta,et al.  Rate Constants for Reactions of Inorganic Radicals in Aqueous Solution , 1979 .

[3]  Tinglin Huang,et al.  Oxidative degradation of organic pollutants in aqueous solution using zero valent copper under aerobic atmosphere condition. , 2014, Journal of hazardous materials.

[4]  Jun Ma,et al.  Strong enhancement on fenton oxidation by addition of hydroxylamine to accelerate the ferric and ferrous iron cycles. , 2011, Environmental science & technology.

[5]  Yunguo Li,et al.  Bond network topology and antiferroelectric order in cuprice CuOH. , 2015, Inorganic chemistry.

[6]  Peng Zhou,et al.  Activation of persulfate/copper by hydroxylamine via accelerating the cupric/cuprous redox couple. , 2016, Water science and technology : a journal of the International Association on Water Pollution Research.

[7]  A. D. Bokare,et al.  Zero-valent aluminum for oxidative degradation of aqueous organic pollutants. , 2009, Environmental science & technology.

[8]  N. Thomson,et al.  Treatment of Organic Compounds by Activated Persulfate Using Nanoscale Zerovalent Iron , 2013 .

[9]  Zongping Shao,et al.  Surface controlled generation of reactive radicals from persulfate by carbocatalysis on nanodiamonds , 2016 .

[10]  M. Peluffo,et al.  Use of different kinds of persulfate activation with iron for the remediation of a PAH-contaminated soil. , 2016, The Science of the total environment.

[11]  T. Nguyen,et al.  Enhanced Inactivation of Escherichia coli and MS2 Coliphage by Cupric Ion in the Presence of Hydroxylamine: Dual Microbicidal Effects. , 2015, Environmental science & technology.

[12]  F. Millero,et al.  Oxidation of copper(I) in seawater at nanomolar levels , 2009 .

[13]  H. Cohen,et al.  Reactions of low-valent transition-metal complexes with hydrogen peroxide. Are they "Fenton-like" or not? 1. The case of Cu+aq and Cr2+aq , 1988 .

[14]  E. Hayon,et al.  Electronic spectra, photochemistry, and autoxidation mechanism of the sulfite-bisulfite-pyrosulfite systems. SO2-, SO3-, SO4-, and SO5- radicals , 1972 .

[15]  J. Gan,et al.  Oxidative removal of bisphenol A using zero valent aluminum-acid system. , 2011, Water research.

[16]  Jun Ma,et al.  Activation of Peroxymonosulfate by Benzoquinone: A Novel Nonradical Oxidation Process. , 2015, Environmental science & technology.

[17]  G. Buxton,et al.  Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution , 1988 .

[18]  Jun Ma,et al.  Influence of pH on the formation of sulfate and hydroxyl radicals in the UV/peroxymonosulfate system. , 2011, Environmental science & technology.

[19]  C. Liang,et al.  Identification of Sulfate and Hydroxyl Radicals in Thermally Activated Persulfate , 2009 .

[20]  Jun Ma,et al.  Rapid acceleration of ferrous iron/peroxymonosulfate oxidation of organic pollutants by promoting Fe(III)/Fe(II) cycle with hydroxylamine. , 2013, Environmental science & technology.

[21]  I. Kolthoff,et al.  Polarographic Kinetic Currents in Mixtures of Persulfate and Copper(II) in Chloride Medium1 , 1966 .

[22]  T. Waite,et al.  Oxidative degradation of the carbothioate herbicide, molinate, using nanoscale zero-valent iron. , 2004, Environmental science & technology.