Biosorption of an Azo Dye by Aspergillus niger and Trichoderma sp. Fungal Biomasses

Abstract

Biosorption is an eco-friendly and cost-effective method for treating the dye house effluents. Aspergillus niger and Trichoderma sp. were cultivated in bulk and biomasses used as biosorbents for the biosorption of an azo dye Orange G. Batch biosorption studies were performed for the removal of Orange G from aqueous solutions by varying the parameters like initial aqueous phase pH, biomass dosage, and initial dye concentration. It was found that the maximum biosorption was occurred at pH 2. Experimental data were analyzed by model equations such as Langmuir and Freundlich isotherms, and it was found that both the isotherm models best fitted the adsorption data. The monolayer saturation capacity was 0.48 mg/g for Aspergillus niger and 0.45 mg/g for Trichoderma sp. biomasses. The biosorption kinetic data were tested with pseudo first-order and pseudo second-order rate equations, and it was found that the pseudo second-order model fitted the data well for both the biomasses. The rate constant for the pseudo second-order model was found to be 10-0.8 (g/mg min⁻¹) for Aspergillus niger and 8-0.4 (g/mg min⁻¹) for Trichoderma sp. by varying the initial dye concentrations from 5 to 25 mg/l. It was found that the biomass obtained from Aspergillus niger was a better biosorbent for the biosorption of Orange G dye when compared to Trichoderma sp.

Removal of Remazol Red Dye With Live Cell Aspergillus Terreus

“…Therefore, the use of bioremediation over physical and chemical procedures is a more efficient and economical way to remove colorants in wastewater. The ability of bacteria [4], fungi [5], and the other biological materials to decolorization dye especially Remozal Red dye has been successfully investigated [6]. Determination of optimum process conditions (pH of solution, biosorbent dosage, agitation period, temperature etc.)…”

Water recycle as a must: decolorization of textile wastewaters by plant‐associated fungi

“…Some recent decolorization studies carried out on model and industrial dyes have shown the biosorption activity of living and dead biomass of several Ascomycetes and Deuteromycetes, among which some specie belonging to the genus Aspergillus , with A. ochraceus and A. niger among the most effective . To the best of our knowledge, until now A. nidulans was never reported to be able to efficiently decolorize textile dyes, although its properties as biosorbent have already been shown for the removal of very dangerous pollutants from wastewaters, such as endosulfan and arsenic .…”

“…Moreover, the results coming from the toxicity studies carried out on D. magna were very supportive for the future industrial application of A. nidulans, which was able to bring the toxicity of treated effluent A and C to naught from the fifth and the second day onwards, respectively. Some recent decolorization studies carried out on model and industrial dyes have shown the biosorption activity of living and dead biomass of several Ascomycetes and Deuteromycetes, among which some specie belonging to the genus Aspergillus, with A. ochraceus and A. niger among the most effective [25,49,76,[82][83][84]. To the best of our knowledge, until now A. nidulans was never reported to be able to efficiently decolorize textile dyes, although its properties as biosorbent have already been shown for the removal of very dangerous pollutants from wastewaters, such as endosulfan [85] and arsenic [86].…”

The Biosorption Features of Cr (VI) Ions by Dried Biomass of a Facultative Anaerobic Bacillus cereus Strain Pf-1

“…The experiments were carried out in a set of Erlenmeyer flasks (250 mL) by shaking desired amount of biosorbent powder in 100 mL Cr (VI) solutions as potassium dichromate (K 2 Cr 2 O 7) of desired concentrations, pH, and temperature to reach equilibrium of the solid-solution mixture. Samples were pelletized in a centrifuge at 10,000 × g for 5 min and the supernatants were essayed for residual Cr (VI) concentration by 1, 5-diphenylcarbazide spectrophotometric method (DPC) measuring the absorbance at 540 nm by using a spectrophotometer (WFZ800-D3B UV/VIS spectrophotometer) [13].…”