Supporting Information

for

Cotton fabric-based facilesolar photocatalytic purification of simulated real dye wastes

Huawen Hu1,2, Menglei Chang*1,Xiaowen Wang2 , Dongchu Chen*1

1 College of Materials Science and Energy Engineering, Foshan University, Guangdong, 528000, China.

2 Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong SAR, 999077, China.

e-mail: ;

Figure S1.The molecular structure of the disperse dye, Blue 79,adopted in the present study for the microencapsulationengineering.

(i) 130oC, 30 min; (ii) separationof microcapsulated disperse dye,(iii)heat preservation for 20min

80oC, 10min 1.5oC/min -2oC/min to 80oC

2.5oC/min Washing (Soaping,Rinsing)

Room Temp.

Microcapsulated disperse dye,Reactive dye, Na2SO4, pH buffering agent

Figure S2. A flow chart showing the microencapsulation-relatedone-bath dyeing of P/C blends,withthe microencapsulated disperse dyecombined with the reactive dye.

130 oC,50 min

80oC, 10 min 1.5oC /min -2oC /min to 80℃

2.5 oC/min Rinsing,Reduction clearing,Rinsing,Soaping,Rinsing

Room Temp.

Disperse dyes,JFC,NNO,Reactive dye, Na2SO4, pH buffering agent

Figure S3. A flow chart showing the conventionalone-bath dyeing of P/C blends,withthe microencapsulated disperse dyecombined with the reactive dye.

Figure S4.SEM images of the microencapsulated disperse dye at different magnification scales.

Figure S5.Calculation of an average crystal size based on Rietveld analysis usingPseudo-Voigt modelfor peak fitting after corrections of background and Kα2.

Figure S6. Schematic presentation of the dip-pad-cure process for preparing the photocatalytically functionalized cotton fabric. The image presented here is reproduced from Ref. [1].

Table S1.Dosage of various additivesloaded in the dyebath for the microencpulation-related one-bath dyeing,withthe microencapsulated disperse dyecombined with the reactive dye.

Reactive dye, Argazol Blue NF-BG / Na2SO4 / pH buffering agent / Microcapsulated
dispersedye, Blue79
2% owf / 40 g·L-1 / 2 g·L-1 / 2% owf

Table S2. Dosage of various additives loaded in the dyebath for the conventional one-bath dyeing, withthe disperse dye combined with the reactive dye.

Reactive dye,Argazol Blue NF-BG / Na2SO4 / pH buffering agent / Disperse dye, Blue 79 / JFC / NNO
2% owf / 40 g·L-1 / 2 g·L-1 / 2% owf / 2 g·L-1 / 1 g·L-1

Table S3.Washing and rubbing fastnesses of P/C blends being dyed for different time using the present microencapsulation-related one-bath dyeing method.

Time min / levelness / Rubbing fastness / Washing fastness（60℃）
Staining
(dry) / Staining
(wet) / Staining
(cotton) / Staining
(polyester) / Change
10 / 4-5 / 5 / 4 / 4 / 4 / 4-5
20 / 4-5 / 5 / 4 / 4 / 4 / 4-5
30 / 4-5 / 5 / 4 / 4-5 / 4-5 / 5
40 / 4-5 / 5 / 4 / 4-5 / 4-5 / 5
50 / 4-5 / 5 / 3-4 / 4 / 4 / 4-5
60 / 4-5 / 5 / 3-4 / 4 / 4 / 4-5

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Table S4.Comparison of the dyeing effect of the two dyeing methods, that is, the conventional one-bath dyeing and microencapsulation-related one-bath dyeing.

Dyeing Method / Levelness / K/S
Value / RubbingFastness / WashingFastness (60oC) / UV/vis absorbance of residual dyebath liquor
Staining
(dry) / Staining
(wet) / Staining
(cotton) / Staining
(polyester) / Change / @ λmax=597nm
Conventional
one-bath dyeing / 4-5 / 17.207 / 4-5 / 4 / 4 / 3-4 / 4-5 / 1.121
Microencapsulation
-related one-bath dyeing / 4-5 / 18.076 / 5 / 4 / 4-5 / 4-5 / 5 / 0.573

Reference

[1]WS Tung, WA Daoud (2011) Self-cleaning fibers via nanotechnology: a virtual reality. J. Mater. Chem. 21: 7858. Doi:10.1039/c0jm03856c

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