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Nanoparticles of magnetic fluids are stabilized with various surfactants. Lignosulfonates are water-soluble byproducts of sulfite pulping process. The aim of our work is to estimate possibility of using nitrated lignosulfonates for stabilization of water-based magnetic fluid and determine optimal nitration conditions. Nitrolignosulfonates were synthesized by nitration of sodium lignosulfonates with nitric acid and the products without further purification were used for preparation of magnetic fluid. Magnetic nanop...

Chromium is widely used in the form of metal and in the form of compounds. The compounds of Cr(VI) are highly toxic. Therefore, the wastewater containing chromium must be thoroughly cleaned by sorption, extraction, electrochemical and biochemicals methods. Methods based on the reduction of Cr(VI) occupy an important place. A large number of reducing agents, including FeSO4, has been proposed for this. Studies carried out earlier showed that during this reaction a magnetoactive compound is formed. Lignosulfonic aci...