Kinetics and Product Analysis of the Electrochemical Dehalogenation of
               Hexachlorobenzene

Gallardo-Rivas, Nohra V.; Guzman, Javier; Gutierrez-Granados, Silvia; Garcia-Jimenez, Maria Guadalupe; Ibanez, Jorge G.; Paramo-Garcia, Ulises

doi:10.5935/0103-5053.20150041

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Articles • J. Braz. Chem. Soc. 26 (4) • Apr 2015 • https://doi.org/10.5935/0103-5053.20150041 linkcopy

Kinetics and Product Analysis of the Electrochemical Dehalogenation of Hexachlorobenzene

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

A method for establishing the kinetics and products of the electrochemical degradation of hexachlorobenzene (HCB) is described. One plausible way of reducing HCB´s toxicity is through cathodic dehalogenation. The characterization of products formed during the electrochemical reduction and the reaction kinetics are both reported. Pentachlorobenzene (PCB), tetrachlorobenzene (TCB) and trichlorobenzene (TriCB) were identified among the degradation products by high performance liquid chromatography (HPLC) with ultraviolet (UV) detection. The kinetics is analyzed under different electrolysis conditions.

hexachlorobenzene; electrochemical dehalogenation; kinetics

Compound	Retention time / min
CB	2.7
1,3-DCB	2.8
1,2,3-TriCB	3.7
1,2,5-TriCB	4.0
1,2,3,4-TCB	4.1
1,2,4,5-TCB	4.2
PCB	4.7
HCB	5.1

Entry	Applied potential / (V/SCE)	Catalyst (CoSalen)	Medium	Reaction rate, –r_HCB = k[HCB]^ro	Effic. / %
1	-1.8	No	Org	3.65 × 10^-3[HCB]^1.5	92.3
2	-1.8	Yes	Org	5.14 × 10^-2	100
3	-1.8	No	^Aq^-Org	3.65 × 10^-3[HCB]^1.5	90
4	-1.8	Yes	^Aq^-Org	2.89 × 10^-2	95.4
5	-1.6	No	Org	5.98 × 10^-2[HCB]²	76.9
6	-1.6	Yes	Org	2.91 × 10^-3[HCB]^1.5	87.2
7	-1.6	No	Aq-Org	1.12 × 10^-2[HCB]²	90.5
8	-1.6	Yes	Aq-Org	3.24 × 10^-3[HCB]^1.5	95.4
9	-1.4	No	Org	nd	-
10	-1.4	Yes	Org	1.19 × 10^-2	77.6
11	-1.4	No	Aq-Org	2.06 × 10^-2	80
12	-1.4	Yes	Aq-Org	1.06 × 10^-2[HCB]^1.5	93.3
13	-1.2	No	Org	2.0 × 10^-4[HCB]¹^.5	92.8
14	-1.2	Yes	Org	1.43 × 10^-2	70.3
15	-1.2	No	Aq-Org	1.0 × 10^-3[HCB]^1.5	79.5
16	-1.2	Yes	Aq-Org	1.87 × 10^-2	82.2

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Sociedade Brasileira de Química Instituto de Química - UNICAMP, Caixa Postal 6154, 13083-970 Campinas SP - Brazil, Tel./FAX.: +55 19 3521-3151 - São Paulo - SP - Brazil
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[1] nd: not determined