Decolorization of dye wastewaters by biosorbents: A review

A simple one step solvothermal strategy using non-toxic and cost-effective precursors has been developed to prepare magnetite/reduced graphene oxide (MRGO) nanocomposites for removal of dye pollutants. Taking advantage of the combined benefits of graphene and magnetic nanoparticles, these MRGO nanocomposites exhibit excellent removal efficiency (over 91% for rhodamine B and over 94% for malachite green) and rapid separation from aqueous solution by an external magnetic field. Interestingly, the performance of the MRGO composites is strongly dependent on both the loading of Fe3O4 and the pH value. In addition, the adsorption behavior of this new adsorbent fits well with the Freundlich isotherm and the pseudo-second-order kinetic model. In further applications, real samples—including industrial waste water and lake water—have been treated using the MRGO composites. All the results demonstrate that the MRGO composites are effective adsorbents for removal of dye pollutants and thus could provide a new platform for dye decontamination.

Magnetite/reduced graphene oxide nanocomposites: One step solvothermal synthesis and use as a novel platform for removal of dye pollutants

Agricultural residues are rich in bioactive compounds. These residues can be used as an alternate source for the production of different products like biogas, biofuel, mushroom, and tempeh as the raw material in various researches and industries. The use of agro-industrial wastes as raw materials can help to reduce the production cost and also reduce the pollution load from the environment. Agro-industrial wastes are used for manufacturing of biofuels, enzymes, vitamins, antioxidants, animal feed, antibiotics, and other chemicals through solid state fermentation (SSF). A variety of microorganisms are used for the production of these valuable products through SSF processes. Therefore, SSF and their effect on the formation of value-added products are reviewed and discussed.

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Agro-industrial wastes and their utilization using solid state fermentation: a review

Carbon nanotube–graphene hybrid aerogels have been fabricated by supercritical CO2 drying of their hydrogel precursors obtained from heating the aqueous mixtures of graphene oxide and carbon nanotubes with Vitamin C without stirring. The resulting hybrid aerogels show very promising performance in water purification including capacitive deionization of light metal salts, removal of organic dyes and enrichment of heavy metal ions.

Green synthesis of carbon nanotube–graphene hybrid aerogels and their use as versatile agents for water purification

Adsorption removal of congo red onto magnetic cellulose/Fe3O4/activated carbon composite: Equilibrium, kinetic and thermodynamic studies

The removal of a carcinogenic dye rhodamine B (C I 45170) from wastewater by biomass of different moulds and yeasts is described Among all of the fungal species tested, the biomass of Rhizopus oryzae MTCC 262 is found to be the most effective Dye adsorption reaches maximum with the biomass harvested from the early stationary phase of growth The optimum temperature and pH for adsorption are observed to be 40 °C and 70, respectively The adsorption rate is very fast initially and attains equilibrium after 5 h The adsorption isotherm follows the Langmuir isotherm model satisfactorily within the studied dye concentration range Of the different metabolic inhibitors tested, 2,4-ditrophenol (DNP) and N,N‘-dicyclohexylcarbodiimide (DCCD) decrease dye adsorption by ∼30% suggesting the role of energy metabolism in the process Spectrophotometric study indicates that the removal of rhodamine B by R oryzae biomass involves an adsorption process Scanning (SEM) and transmission (TEM) electron microscopic inve

Adsorption behavior of rhodamine B on Rhizopus oryzae biomass.

The bioconversion of fruit wastes into single cell protein production has the potential to solve the worldwide food protein deficiency by obtaining an economical product for food and feed. Using food processing leftovers in the production of single cell protein as substrate would alleviate pollution. In this work cucumber and orange peels were evaluated for the production of single cell protein using Saccharomyces cerevisiae by submerged fermentation . Results showed that tested fruit wastes were highly susceptible to hydrolysis. A comparative study of fruit wastes revealed that cucumber peel generates higher amount of protein followed by that of orange with 53.4% and 30.5% crude protein respectively per 100 gm of substrate used. Percentage of protein in single cell protein was much lower (17.47%) when Saccharomyces cerevisiae was grown on supplemented fruit hydrolysate medium that contained inorganic nitrogen sources but devoid of glucose. Addition of glucose to the supplemented fruit hydrolysate medium enhanced the protein content (60.31%) within the yeast cell. Thus the single cell protein production by yeast depends on the growth substrates or media composition.

https://www.ijset.net/vol-5/1/IJSET%209.pdf

Jayati Bhowal

Papers

Adsorption behavior of rhodamine B on Rhizopus oryzae biomass.

Utilization of fruit wastes in producing single cell protein

Purification and molecular characterization of a sialic acid specific lectin from the phytopathogenic fungus Macrophomina phaseolina.

Mucin binding mitogenic lectin from freshwater Indian gastropod Belamyia bengalensis: purification and molecular characterization.

Hypocholesterolemic effect of Spirulina platensis (SP) fortified functional soy yogurts on diet-induced hypercholesterolemia