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The removal of heavy metal ions from aqueous solutions by amine functionalized cellulose pretreated with microwave-H2O2

机译：微波-H 2 O 2 预处理的胺官能化纤维素从水溶液中去除重金属离子

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A new biosorbent (PEI/SA-MCCMV) with abundant amino and carboxyl groups was prepared by grafting polyethylenimine (PEI) onto carboxylated microcrystalline cellulose (SA-MCCMV), which was obtained through grafting succinic anhydride (SA) on pretreated microcrystalline cellulose (MCCMV) with microwave-H2O2. It was confirmed by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray photoelectron microscopy (XPS) and thermogravimetric (TG) that the amino and carboxyl groups were introduced onto the microcrystalline cellulose, and the amino and carboxyl groups content were 2.61 mmol g?1 and 4.64 mmol g?1, respectively. The effects of the contact time and pH on heavy metal ion uptake were investigated. The adsorption kinetic data was described well with the pseudo-second-order model (R2 > 0.99) and the adsorption isotherms were well fitted by the Freundlich isotherm model, demonstrating that chemisorption was the rate-controlling factor for heavy metal ion adsorption on the PEI/SA-MCCMV biosorbent. Furthermore, the remarkable adsorption capacity (217.3 and 357.1 mg g?1 for Cd(II) and Pb(II), respectively) obtained from the Langmuir isotherm indicated that this biomass adsorbent has a promising application in water treatment.
机译：通过将聚乙烯亚胺（PEI）接枝到羧化微晶纤维素（SA-MCC ）上，制备了具有丰富的氨基和羧基的新型生物吸附剂（PEI / SA-MCC MV ）。 MV ），这是通过将琥珀酸酐（SA）与微波H接枝到预处理的微晶纤维素（MCC MV ）上而获得的 2 O 2 。通过傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM），X射线光电子显微镜（XPS）和热解重量（TG）证实，将氨基和羧基引入微晶纤维素，并且将氨基引入羧基。羧基含量分别为2.61 mmol g ？1 和4.64 mmol g ？1 。研究了接触时间和pH值对重金属离子吸收的影响。用伪二级模型（ R 2 MV 生物吸附剂上重金属离子吸附的速率控制因子。此外，其对Cd（ II ）和Pb（ II 的出色吸附容量（217.3和357.1 mg g ？1 分别从Langmuir等温线获得）表明该生物质吸附剂在水处理中具有广阔的应用前景。

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