Supplementary Information

Transformation of catechol coupled to redox alteration of humic acids and

the effects of Cu and Fe cations

Xiong Jia1, Yujie He1,2,*, Philippe Corvini1,3, Rong Ji1,2

1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment,

Nanjing University, Xianlin Avenue 163, 210023, Nanjing, China

2. Quanzhou Institute for Environment Protection Industry, Nanjing University, Beifeng Road,

362000 Quanzhou, China

3. Institute for Ecopreneurship, School of Life Sciences, University of Applied Sciences and Arts

Northwestern Switzerland, Gründenstrasse 40, CH 4132, Muttenz, Switzerland

Journal: Science of the Total Environment

Pages: 3

Figures: S1-S2

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3508501350185023502850335038500

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Wavenumbers (cm-1)

Tran

smitt

ance

%

Figure S1. Fourier transform infrared (FT-IR) spectrophotometry spectra of humic acid. The band of

1645 cm−1 corresponds to a number of bands including aromatic C=C skeletal vibrations, asymmetric

stretching of C=O of quinones and ketones, and symmetric stretching of COO− (Barber et al., 2001;

Traversa et al., 2014).

3460 3470 3480 3490 3500 3510 3520 3530 3540 3550 3560Magnetic Field (G)

Inte

nsity

Figure S2. Electron paramagnetic resonance (EPR) spectra of H2/Pd-reduced HA (HAred) and non-

reduced HA (HAorg). HAred or HAorg suspensions were mixed with 0.1 mM DMPO and bubbled with

air for 2 min prior to EPR analysis.

1645

HAred

HAorg

2

References

Barber L.B., Leenheer J.A., Noyes T.I., Stiles E.A., 2001. Nature and transformation of dissolved

organic matter in treatment wetlands. Environmental Science & Technology 35, 4805-4816.

Traversa A., Loffredo E., Gattullo C., Palazzo A., Bashore T., Senesi N., 2014. Comparative

evaluation of compost humic acids and their effects on the germination of switchgrass

(Panicum vigatum L.). Journal of Soils and Sediments 14, 432-440.

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