Study On Preparation And Characteristics Of Bamboo Charcoal-Ferrate Composites

In this paper, bamboo charcoal-ferrate composites with adsorption and magnetismwere prepared by combining bamboo charcoal (BC) and ferrate (MnFe₂O₄ and CuFe₂O₄).The preparation conditions of the composites were studied, and the optimal preparationconditions were described. The configuration and magnetic characteristic of thecomposites were characterized. The adsorptive capability for dyestuff molecules (acid redB and methylthionine chloride) and metal ions (Fe²⁺,Cr(â…¥),Ni²⁺,Pb²⁺) was investigatedand the regenerating function was evaluated in order to develop a kind of bamboocharcoal ferrate composites with both good adsorptive capability and favorable magneticcharacteristic which could be recovered by magnetic separation technique. The resultsshowed that:(1)The bamboo charcoal ferrate composites MnFe₂O₄-BC and CuFe₂O₄-BCmagnetized by MnFe₂O₄ and CuFe₂O₄ prepared by chemistry-coprecipitation methodpossessed favorable magnetic characteristic which can be recovered by magneticseparation technique.(2)The bamboo charcoal and ferrate can be combined by two methods which aredirect compounding method and magnetic reagent compounding method. The optimalconditions of direct compounding method were as follows: pH value of soliquoid was 13,water bath temperature was above 90℃, the remaining time in the water bath was 4 h,the time standing in the air was 1 h, and the optimal conditions of magnetic reagentcompounding method were: pH value of magnetic reagent was about 5, using CaCl₂ as aactivator. Comparing the two methods, the adsorptive capability of composites combinedby direct compounding method was better than that of magnetic reagent compoundingmethod, but the magnetic characteristic of composites combined by magnetic reagentcompounding was excellent.(3)MnFe₂O₄-BC possessed favorable adsorptive capability for methylthioninechloride, and the adsorptive capability of CuFe₂O₄-BC toward acid red B was preferable.(4)The adsorptive capability of bamboo charcoal ferrate composites was better thanthat of bamboo charcoal and MnFe₂O₄-BC had better adsorptive capability for the metal ions than CuFe₂O₄-BC. The order of bamboo charcoal ferrate composites of adsorptivecapability for metal ions was Fe³⁺＞Cr(â…¥)＞Ni²⁺＞Pb²⁺.(5)CuFe₂O₄-BC and MnFe₂O₄-BC still possessed good adsorption ability for acid redB and Cr(â…¥) after regeneration.