Background: It is known that wastewater from textile industries are responsible for producing
large amounts of highly contaminated effluents by various types of synthetic dyes. These compounds
can be toxic, and in some cases, are carcinogenic and mutagenic and its removal is recommended.
Application: In the area of water purification, nanomaterials have been applied for removal of several
compounds. Of the four classes of nanomaterials, zeolites have demonstrated good results for the removal
of dyes. Nanozeolite synthesized from bottom ash and modified with hexadecyltrimethylamonium
(ZMB) was used as adsorbent to removal of Solophenyl Navy (SN), Solophenyl Turquoise (ST)
and their hydrolyzed forms (SNH and STH, respectively) from simulated textile wastewater.
Method: The physical-chemical characterization of materials was presented by using relevant analytical
methods (XRD, SEM, BET surface area, etc.). Effects of parameters such as initial dye concentration,
contact time and equilibrium adsorption were evaluated. The adsorption kinetics followed the
Results: Langmuir isotherm model shows the best fit for most dyes-ZMB systems. In order to identify
if ZMB presented toxicity for the environment, bioassay and toxicity identification evaluation (TIE)
with C. dubia were performed. The leached of ZMB was toxic to daphinids (11.3 TU).
Conclusion: TIE results appointed that the main cause of the toxicity could be due the surfactant and
metal ions presents in aqueous solution.