Preparation Of Magnetic Biomass Carbon And The Study Of Its Removal For Dyes

Dye wastewater emission has caused great attention with the rapid development of the printing and textile and other industries.It is generally recognized that dye wastewater was extremely difficult to deal with due to its high toxicity,high concentration and deep chromaticity.Magnetic nanoparticles not only have the general characteristics of the nanometer materials,but also the advantages of superparamagnetism.In addition,biomass activated carbon?BAC?with developed pore structure and high specific surface area has been widely used to remove pollutants.Therefore,magnetic nanoparticles and biomass activated carbon were combined together and use for preparation of magnetic biomass activated carbon.Several dyes were selected as model pollutants.The main research content of this paper is as follows:?1?A novel and simple method for preparation of Fe₃O₄/BAC based on platane leaves was developed.The BAC was prepared by decomposition of platane leaves,and magnetic nanoparticles were grown in situ on BAC through solvothermal method.To investigate adsorption ability of the composites,several dyes were selected as model pollutants,and the sorbent showed high adsorption capacity for the dyes.Solution pH had no significant effect on adsorption in the range of 5-9.The kinetic study showed that the adsorption of dyes on Fe₃O₄/BAC fitted well with pseudo-second order kinetic equation.The adsorption behavior of Fe₃O₄/BAC for dyes followed Langmuir isotherm model,and the adsorption capacity of congo red,neutral red,and methyl green were 396.8,171.2,and 403.2 mg·g-1,respectively.In addition,the maximum adsorption capacity in natural water showed weak decrease,indicating a good adsorption effect.The adsorption of these dyes on Fe₃O₄/BAC was spontaneous.The Fe₃O₄/BAC showed great potential for removal of dye pollutants from environmental water.?2?Fe₃O₄/BAC was used as adsorbent and Fenton-like reagent for preconcentration and degradation of methylene blue?MB?from an aqueous solution in the presence of H2O2.The removal efficiency reached 97% for 100 mg·L-1 MB with 1.2 g·L-1 of Fe₃O₄/BAC and 0.23 mol·L-1 of H2O2 under the condition of pH 7.0 and temperature of 30 °C.Over 80% of MB could be still removed after five times of recycle reaction.The Fe₃O₄/BAC shows good potential for oxidation of organic pollutants.?3?In this work,magnetic mesoporous carbon?MMC?material based on polydopamine was prepared using mesoporous silica SBA-15 as a hard template,FeCl3 as iron precursor,PDA as carbon precursor,and the adsorption of organic dyes on MMC was investigated.Three organic dyes were selected as target pollutants.Under the optimal condition,the maximum adsorption capacity calculated from Langmuir adsorption isotherm for congo red,neutral red and methyl green were 2315.4,2431.6 and 2927.1 mg·g-1,respectively.The kinetic study showed that the adsorption of dyes on MMC fitted well with pseudo-second order kinetic equation.In addition,the maximum adsorption capacity in natural water showed weak decrease,indicating a good adsorption effect.The adsorption of dyes on MMC was spontaneous process.The magnetic mesoporous carbon showed great potential for dye pollutants removal.