Preparation Of Spinel Adsorbent By Bio-template And Study On Its Adsorption Properties

Magnetic material are of great interest for researchers from a wide range of disciplinesd，including magnetic fluids， catalysis， biotechnology/biomedicine， magnetic resonanceimaging， data storage，and environmental remediation．A number of literatures have beenreported on the the synthesis，protection，functionalization，and application of，magneticmaterial，as well as the magnetic properties．However，same of materials are easy to gathertogether due to their small size，and they are unstable because of the active surface，and theyhave wide size distributions．Hence it is necessary to obtain magnetic material with smallerand narrower size distribution than the ones manipulated with external magnetic fields andwith stable property． Another potentialapplication of these nanoparticles is their use astertiary treatment of residual waters acting as powerful reducer agents of organic andinorganic material，with the advantage that it could be possible to recycle and separate themagnetite particles by an external magnetic field．In this paper，synthesis and application ofspinel and ferrite the conditions of synthesis of magneitc material are studied．The mainresults obtained in the thesis are divided into two parts as following：Firstly， we report a biotemplating approach to produce hierarchically porous magneticMgFe2O4adsorbent with improved adsorbed activity by using egg shell membrane astemplate．SEM revealed that the MgFe2O4adsorbet was composed of granular MgFe2O4Withmesh structure，the specific surface area is26.1m2/g．Giving a comprehensive comparisonand analysis of the adsorption capacity of ferrite material with spinel structure for AF．TheMgFe2O4materia demonstrates an extremely high acid fuchsin (AF) removal efficiency fromthe wastewater almost complete removal within30h．For200mg·L1of AF aqueoussolution，the maximum of AF removal can reach1923.7mg·g1．By the calculation ofLangmuir isotherm model，the maximum adsorption capacity of MgFe2O4for AF is12870mg·g1．The large saturation magnetization (47.898emu·g1) of the material allows fastseparation of MgFe2O4material loaded with AF from the liquid suspension．Because in AFthe removal process of porous structure can promote the adsorption properties of flowadsorption，MgFe2O4synergy to enhance removal ability of AF．Based on the adsorptionproducts identified by XRD and FTIR spectra，a possible adsorption mechanism of AF on the MgFe2O4composite was proposed．The significantly reduced treatment time required toremove the AF and the simple，low-cost and pollution-free preparation method makeMgFe2O4material promising for the highly efficient removal of dyes from the waste water．Secondly，we report a biotemplating approach to produce hierarchically porous magneticCuFe2O4adsorbent with improved adsorbed activity by using silk as template． SEMrevealed that the CuFe2O4adsorbet was composed of granular CuFe2O4With meshstructure，the specific surface area is48.46m2·g1．Giving a comprehensive comparison andanalysis of the adsorption capacity of ferrite material with spinel structure for Ni2+． TheCuFe2O4demonstrates an extremely high acid Ni2+removal efficiency from the wastewateralmost complete removal within10h． For80μg·mL1of Ni2+aqueous solution, themaximum of Ni2+removal can reach33.5909mg·g1．By the calculation of Langmuirisotherm model， the maximum adsorption capacity of CuFe2O4for Ni2+is36.3714mg·g1． The large saturation magnetization (11.384emu·g1) of the material allows fastseparation of CuFe2O4material loaded with Ni2+from the liquid suspension．Because in Ni2+the removal process of porous structure can promote the adsorption properties of flowadsorption, CuFe2O4synergy to enhance removal ability of Ni2+．Based on the adsorptionproducts identified by UV–Vis spectra，XRD and FTIR spectra，a possible adsorptionmechanism of Ni2+on the CuFe2O4composite was proposed．The significantly reducedtreatment time required to remove the Ni2+and the simple，low-cost and pollution-freepreparation method make CuFe2O4material promising for the highly efficient removal ofdyes from the waste water．...