Abstract
Zn0.3Fe0.45O3 bimetallic oxide nanoparticle (ZnFeBONp) was synthesized and characterized by FESEM, EDS, XRD, BET, TEM and FT-IR techniques with the aim of exploring its application for removing of Congo red dye from waste samples. The effects of pH, contact time, adsorbent dosage and dye concentration on the removal of dye were investigated and optimized as pH 6.5, 40 min contact time, 0.2 g adsorbent dose for 20 ppm dye. Results indicated that the synthesized adsorbent could effectively remove high concentrations of dye in a short contact time. Isotherm modeling revealed that the Langmuir isotherm could better describe the adsorption of the dye on the ZnFeBONp as compared to other models. The qmax up to 333.33 mg g−1. The results showed that the adsorption system followed the Ho and McKay equations for the entire adsorption. Kinetics of Congo red adsorption on ZnFeBONp best fit with the pseudo-second-order model. Because of the high-specific surface area and nano-scale particle size, ZnFeBONp indicated favorable adsorption behavior for dye.
Highlights
Water pollution due to industrial dye effluent is a very serious problem which undergoes chemical as well as biological changes, consume dissolved oxygen, and destroy aquatic life [1–3]
The ZnFeBONP were synthesized according to a co-precipitation method at constant temp 60 °C with stirring
Significant X-ray diffraction peaks occurred at 31.24°, 34.35°, 36.29°, 56.19°, 62.63° and 67.80° corresponds to reflection from (1 1 1), (2 0 0), (0 0 2), (1 0 2), (3 1 1) and (2 0 0) miller planes of ZnFeBONPs and the corresponding peaks became stronger and narrower, which implied that the crystallinity was higher
Summary
Water pollution due to industrial dye effluent is a very serious problem which undergoes chemical as well as biological changes, consume dissolved oxygen, and destroy aquatic life [1–3]. Dyes are used in various industries such as construction, textile, paper, plastics, leather, cosmetics, etc., for the purpose of coloring the related products. Large amount of colored wastewater is produced. Many dyes are highly poisonous, carcinogenic, and stable from daylight and oxidation. Dyes make water colorful and do harm for the survival of aquatic life and the ecosystem [2]. Dyes will deadly affect the photosynthetic aquatic life due to the reduction of light penetration [3]. The researcher working for developing an effective and suitable way to eliminate dye contamination from wastewater has become an urgent issue
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