Hen Feather: A Remarkable Adsorbent for Dye Removal - Green Chemistry for Dyes Removal from Wastewater - page 415

Table 11.1 Important f facts about Azo Dye-Tartrazine.

Synonyms Acid Yellow 23, Filter Yellow, Food Yellow, Food Yellow

# 4

Chemical Formula C 16 H 9 N 4 Na 3 O 9 S 2

IUPAC Name Trisodium-5-hydroxy-1-(4-sulfonatophenyl)-

4-(4-sulfonato phenylazo)-H- pyrazole-3-carboxylate

Color Index 19140

CAS Number 1934-21-0

Molecular Weight 534.4

Physical State Solid

Color Solid Granular, Light Orange

Melting Point > 300°C (Decomposes at 250°C)

Odor Odorless

Solubility in Water Soluble (140 g/l)

Absorption Maxima 426 nm

Specific Gravity 1.85-1.95

Table 11.2 Important facts about Azo Dye-Amaranth.

Synonyms Acid Red 27, Food Red 9, FD & C Red 2, Azorubin S

Chemical Formula C 20 H 11 N 2 Na 3 O 10 S 3

IUPAC Name Trisodium 3-hydroxy-4-(4-sulfonato-1-naphthylazo)-

2,7-naphthalene disulfonate

Color Index 16185

CAS Number 915-67-3

Molecular Weight 604.48

Physical State Solid

Color Reddish - Brown Powder

Melting Point Decomposes at 120 C (Without Melting)

Odor Odorless

Solubility in Water Soluble (50 g/L)

Absorption Maxima 520 nm

Specific Gravity 1.5