A series of first-, second-, and third-generation dendronic triazolo-pyridazinones were synthesized in good yields via the Cu I -catalyzed azide-alkyne cycloaddition reactions of 4,6-diphenyl-2-(prop-2-yn-1-yl)pyridazin-3(2H)-one, possessing a terminal alkyne functional group with aromatic mono-and diazides with long alkyl and chiral glycol side-chain substituents. The chemical structures of the new compounds were characterized using different spectroscopic methods. The morphology of the dendrons was examined using the scanning electron microscope (SEM) analysis, which revealed the formation of highly ordered nanofiber and nanorod aggregations, directed by π-stacking interactions and van der Waals forces. Graphical abstractKeywords Dendron · Azide-alkyne cycloaddition · Self-assembly · Pyridazin-3(2H)-one · Nanofiber · Nanorod

Today the major environmental concern is the water pollution due to the discharge of colored wastewater from textile industries. This colored wastewater is harmful to human, aquatic life, and ecological sustenance. It is essential to treat this wastewater before discharge into the environment. In this study, we used one of the world's worst weeds water hyacinth (Eichhornia crassipes) as an adsorbent. The combination of water hyacinth with coal and bricks can minimize the number of different contaminants present in the wastewater. The textile wastewater was treated with water hyacinth, coal and bricks and then filtered. The study revealed that after treatment of wastewater with water hyacinth, coal and brick, the value of all parameters was reduced than the untreated wastewater. The results indicate that the water hyacinth have a high possibility of being used as a cheap and efficient adsorbent to remove the color and organic contaminants from wastewater of textile industry.

The chemical contamination of water from a wide range of toxic derivatives, in particular heavy metals, aromatic molecules and dyes, is a serious environmental problem owing to their potential human toxicity. New Eco-labels for textile products and tighter restrictions on wastewater discharges are forcing textile wet processors to reuse process water and chemicals. This challenge has prompted intensive research in new advanced treatment technologies. Among all the treatments proposed, bagasse has been reported to be a potential adsorbent for the removal of pollutants or color from the wastewater. The results showed that there is a recent increasing interest in the bagasse(Saccharum Officinarum) of new low-cost, high performance, environment friendly adsorbents used in wastewater treatment 1 .