Abstract
A new sorbent material, barium sulfate-Direct Blending Yellow D-3RNL hybrid (BSD), was synthesized and characterized by various methods. Both the anionic dyes, Reactive Brilliant Red X-3B and Weak Acid Green GS were hardly adsorbed by the BSD material, while the sorption of Ethyl Violet (EV) and Victoria Blue B were extremely obvious. The sorption of cationic dyes obeyed the Langmuir isotherm model, which depended on the electric charge attraction. The saturation amount of EV adsorbed onto the BSD material approached to 39.36 mg/g. The sorption of EV changed little with pH from 3 to 12 while it increased with increasing levels of electrolyte. A dye wastewater sampled from Jinjiang Chemicals was treated, and the color removal rate was more than the COD removal rate. In addition, the cationic dye-BSD sludge was utilized as a colorant fill-in coating. The light stability and thermal stability of the colorant was measured and exhibited good features. This work provided a simple and eco-friendly method for dye wastewater treatment with recycling of waste.
Highlights
A growing population leads to rapid proliferation of industries and their pollution
This work has developed a low-cost sorbent by hybridizing Direct Blending Yellow D-3RNL with barium sulfate
Barium sulfate and D-3RNL were selected for synthesizing a conjugate–BaSO4 hybrid to treat dye wastewater and the dye-BaSO4 hybrid material (BSD) sludge produced during the treatment process may have the potential to be reused as colorant fill-in coating
Summary
A growing population leads to rapid proliferation of industries and their pollution. Over 10,000 dyes and more than 700,000 tons of dyes are produced every year, and over 5% are discharged into the aquatic environment [1]. Most of the absorbents have low adsorption capacity, slow adsorption equilibria and are expensive, and the sludge produced in the treatment is another pollution problem. Zhao and Gao [25] developed a facile treatment of a dye wastewater mixture by in situ hybridization with growing calcium carbonate. This work has developed a low-cost sorbent by hybridizing Direct Blending Yellow D-3RNL with barium sulfate. Barium sulfate and D-3RNL were selected for synthesizing a conjugate–BaSO4 hybrid to treat dye wastewater and the dye-BSD sludge produced during the treatment process may have the potential to be reused as colorant fill-in coating. The dye wastewater and sludge will be treated simultaneously to decrease the discharge of organic pollutants to the environment
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