Abstract
To solve the problem of excess molybdenum, a new composite nanomaterial was prepared for adsorption and removal of Mo (VI). Chitosan-modified magnetic nanoparticles (Fe3O4/CTS) were prepared by the method of glutaraldehyde crosslinking. The morphology of the composite nanoparticles was characterized by a scanning electron microscope, and the magnetic properties of the nanoparticles were characterized by an external magnetic field. The content of Mo (VI) was determined by thiocyanate spectrophotometry. The relationship between adsorbent dosage, oscillation velocity, contact time and removal of Mo (VI) was studied. The results showed that when the dosage of Fe3O4/CTS magnetic nanoparticles was 0.4 g, the oscillation speed was 100 r min-1, and the contact time was 10 min, 100 ml of Mo (VI) solution was treated under the condition of initial pH =4, and the removal effect of Fe3O4/CTS magnetic nanoparticles on Mo (VI) was the best. Treatment effluent can reach the comprehensive sewage discharge standard in Liaoning Province. At the same time, it is proved that Fe3O4/CTS magnetic nanoparticles are a kind of adsorbent which is easy to recover, easy to separate magnetically, and has the ability to remove Mo (VI) efficiently.
Highlights
Heavy metal molybdenum has the characteristics of high melting point, high density, high temperature resistance and high hardness[1]
The results show that the removal rate of molybdenum by Fe3O4/CTS magnetic nanoparticles has been increasing with the addition of adsorbent
Removal of Mo (VI) in solution by Fe3O4/CTS magnetic nanoparticles prepared by glutaraldehyde crosslinking method is rapid and effective
Summary
Heavy metal molybdenum has the characteristics of high melting point, high density, high temperature resistance and high hardness[1]. It is widely used in electrical industry, iron and steel industry, chemical industry, fertilizer and so on[2]. Excessive intake of molybdenum can lead to poisoning, resulting in weakness of limbs, gout, headache, kidney damage and other symptoms[5]. There is no definite target for molybdenum emission in Integrated Wastewater Discharge Standards of China[7]. Because of the particularity of molybdenum pollution in Liaoning Province, Integrated Wastewater Discharge Standards of Liaoning Province stipulates that the molybdenum concentration allowed for direct discharge is 1.5 mg L-1[8], but many molybdenum mining enterprises do not have a perfect discharge system to dispose of molybdenum wastewater, which leads to serious molybdenum pollution. Because the molybdenum content of mining wastewater from a molybdenum mining enterprise reaches 12-25 mg L-1, attention should be paid to the problem of excess molybdenum emissions discharged by enterprises, and a method to remove molybdenum effectively should be found
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