Facile Yeast @Ti⁴⁺ Microsphere For Effective Removal Of Hexavalent Chromium From Aqueous Solution

Hexavalent chromium,as one of acknowledged heavy metal carcinogen,is highly toxic,which can not only induce lung cancer,liver and kidney damage,but also bring persistent harm to atmosphere,water and soil environment.The hexavalent chromium contamination mainly comes from industries of electroplating,leather,pigment and metal pickling.Urgent solutions are demanded for efficient desorption of hexavalent chromium from water environment.Development of novel materials for efficient desorption of hexavalent chromium from water environment paves the way for environment protection,which is significant and valuable.In this study,facile yeast@Ti⁴⁺ microsphere were prepared based on yeast cell,which have been successfully used for desorption of hexavalent chromium from water environment.Yeast@Ti⁴⁺microsphere in adsorption process was characterized by means of TEM,FTIR and XPS.Influence factor for hexavalent chromium adsorption by yeast@Ti⁴⁺microsphere,such as pH,contact time,yeast dose,coexisting ions and regeneration were also investigated.The results demonstrated that adsorption of Cr?v??on yeast@Ti⁴⁺microsphere was not affected with 0-0.25 mmol L-1NaOH or H2SO4 in solution.Adsorption of Cr?v??on yeast@Ti⁴⁺ microsphere fitted with the pseudo-second-order kinetic and Langmuir isotherm models,and adsorption equilibrium was achieved within 5 min,suggesting chemical adsorption and monolayer adsorption.Under optimum conditions,the maximum adsorption capacity was calculated to be 34.1 mg g-1.Coexisting ions such as SO42–? NO3–? Cl–affected slightly on hexavalent chromium adsorption by yeast@Ti⁴⁺microsphere,while CO32– and PO43– showed certain influence on that.Besides,yeast@Ti⁴⁺microsphere can be well regenerated for five times which showed potential practical application value.