Removal of trivalent and hexavalent chromium by seaweed biosorbent

Article Abstract:

Sargassum has the potential to be used as an inexpensive alternative to treating wastewater for both trivalent chromium, Cr(III), and hexavalent chromium, Cr(VI), two forms of a toxic heavy metal that comes mainly from the metal-finishing and electroplating industries. Sargassum has been demonstrated to be an excellent biofilter for Cr(VI) at pH 2 while the seaweed is also able to absorb as much as 40 mg per gram of Cr(III) through ion exchange at pH 4. The successful use of sargassum for treating chromium-rich wastewater will result in substantial savings mainly from the replacement of the expensive reducing agents currently being used.

Comment:

Sargassum has the potential to be used as an inexpensive alternative to treating wastewater for both Cr(III) and Cr(VI)

United States, Product information, Article

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Ionic strength and electrostatic effects in biosorption of divalent metal ions and protons

Article Abstract:

A mathematical model for determining the equilibrium of proton and metal ion binding as a function of metal ion concentration, pH, and ionic strength can be derived from the passive biosorption of metal ions by biomass of the brown alga Sargassum. It is more ideal to use models that include the effects of ionic strength in the whole process because the presence of sodium greatly affects Cd binding. Although a simple Donnan model causes some swelling of the biomass particle, it is still very useful in predicting the biosorption results.

Research and Development in the Physical, Engineering, and Life Sciences, Water Pollution, Pollution Control R&D, Models, Algae, Biomass, Pollution control research, Heavy metals

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Removal of trivalent and hexavalent chromium by seaweed biosorbent

Article Abstract:

Protonated sargassum seaweed sorption of chromium (III) and chromium (VI) experiments show that ion-exchange model for chromium hydroxide fits the sorption data for chromium (III). Moreover, experiments also reveal that uptake of chromium (VI) at pH 2 may be explained by chromium (II) reduction coupled with anion exchange. The existence of the optimal pH for chromium sorption is explainable by accounting for biomass desorption of chromium (III) at low pH and the reduction effect of pH on chromium (VI) in aqueous solutions.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Chromium, Industrial Water Pollution, Miscellaneous marine products, Environmental aspects, Bioremediation, Chromium (Metal)

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