Supplementary Information

Electrochemical aspects of photocatalysis: Au@FeS2 nanocomposite for removal of industrial pollutantGurpreet Kaur£, Pooja D. Sharmaǂ, Manjeet KumarɅ, Anup Thakur€, Rajni Balaɤ, Akshay Kumar£*

Figure S1. Chemical structure of Novacron red dye

FigureS2. Absorptional intensity spectral changes with time for the aqueous solution of textile industry based NRH dye (1 mg/L) using different loading of FeS2 (a) (0

g/L) (b) 0.25 g/L (c) 0.5 g/L (d) 0.75 g/L (e) 1 g/L under visible lig

Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics.This journal is © the Owner Societies 2017

Figure S3. Absorption spectra of NRH dye with different catalyst loading of Au@FeS2 (a) 0.25 g/L (b) 0.5g/L (c) 0.75 g/L (d) 1 g/L under visible light irradiation

FigureS4. Effect of Au@FeS2 catalyst dosage (gL-1) on photocatalytic degradation of NRH dye (1 g/L) under visible light irradiation.

Figure S5: (a) CV (scan rate 50 mV/sec) and (b) FRA chracterstic (at OCP) of bare GC electrode in 5 mM ferri/ferro redox system containing 0.1 M KCl

FigureS6. Microchemical analysis of FeS2 by FESEM-EDS.

FigureS7. EDS spectra of respective FESEM image of Au@FeS2.

The chemical composition of synthesized FeS2 and Au@FeS2 which acquired by FESEM-EDS is presented in figure S1 and S2. The EDS spectra of FeS2 and Au@FeS2 composite showed the existence of Fe, S in pure and Au,Fe and S in composite respectively.

Table 1. Calculated photodegaradtion efficiency of different concentrations FeS2 as well as Au@FeS2 catalyst for textile NOVACRON Red NRH dye

(mg/L).

Catalyst/NRH dye (g/L)

Degradation efficiency with FeS2 in 120 min

irradiation (%)

Degradation efficiency with Au@FeS2 in 60 min

irradiation (%)]

0 11.91 7.962

0.25 82.26 44.77

0.5 87.79 61.19

0.75 90.11 84.58

1 95.63 96.02