Removal of Cr(Ⅵ)from Water by Magnetic Peanut Shell Biochar
Hexavalent chromium(Cr(Ⅵ))is one of the most toxic pollutants in the environment,and it is much more toxic than Cr(Ⅲ).Iron oxide is one of the most commonly used adsorption and reducing agents in water and soil.In this study,Magnetic Peanut shell Biochar(FeC)was prepared with FeCl3 solution impregnation method,and the iron oxide was introduced into the Biochar pores.FeC was used to separate the chromium from water and soil through the magnetic responds of the iron oxide and its adsorption properties for the containing Cr(Ⅵ)anions.The results showed that,the content of Fe in FeC was 9.66%,and the specific surface area of BET was 365.32 m2·g-1,the two were higher than the original Peanut shell Biochar(PsC).The saturation magnetization value of FeC was 4.72 emu·g-1 with good magnetic responds,and be separated from water or soil readily by using magnetic separation.The fit of Lang-muir equation to the adsorption process was better than that of Freundlich equation,and the Langmuir maximum chromium adsorption was 31.25 mg·g-1.When the solution initial Cr(Ⅵ)concentration was 100 mg·L-1 and the addition amount of FeC was 7 g·L-1,the re-moval rate of Cr(Ⅵ)was greater than 99%,and the adsorption capacity decreases with the increase of pH value of the solution.The chromium adsorption process conforms to the pseudo-second-order kinetic model.Therefore,this magnetic Biochar can be applied to the remediation of Cr(Ⅵ)contaminated water,and can separate the chromium from the water.
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