Supplementary Data

Fig. A1 a SEM image of zeolite, magnification 1,500X b EDX spectrum of zeolite

1

Fig. A2 a SEM image of activated carbon, magnification 1,500X b EDX spectrum of activated

carbon

0.0029 0.003 0.0031 0.0032 0.0033 0.0034 0.00350

0.5

1

1.5

2

2.5

1/T, (1/K)

ln k

d

Fig.A3 Plot of ln kd versus 1/T for estimation of thermodynamic parameters

2

Fig. A4 a SEM image of MC (before adsorption), and b SEM image of MC (after adsorbed with

AO7) (1000X magnification)

200300

400500

600700

800-0.50

0.51

1.52

2.53

3.54

Before treatmentAfter treatment

Wavelength (nm)

Abs

orba

nce

(a.u

.)

Fig. A5 UV-Vis spectra of AO7 before and after treatment by MC

3

Fig. A6 a Chromatogram of AO7 dye solution (before adsorption) b chromatogram of AO7 dye

solution (after adsorption)

Table A1 Phytotoxicity study of AO7 and its decolorized samples

Observations Phaseolus mungo

I II III

Germination

(%)

100 100 100

Shoot length

(cm)

10 ± 0.5 3.5 ± 0.5 9.0 ± 0.5

I: Seeds germinated in distilled water;

II: Seeds germinated in untreated AO7;

III: Seeds germinated in AO7 decolorized samples

4

Peak 1