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采用环氧氯丙烷、乙二胺和三乙胺对麦草秸秆进行化学改性,研究改性麦草秸秆的性能指标并重点考察其对水体中的NO3-,PO43-和Cr2O72-的吸附性能及效果.研究结果表明,改性麦草秸秆引入了带正电荷的胺基基团,可以显著提高对阴离子的吸附性能;改性麦草投加量、pH值、吸附时间和温度对吸附性能影响较大,吸附过程符合伪二级动力学方程和Langmuir等温吸附模式;改性麦草秸秆对NO3-、PO43-(P)和Cr2O72-(Cr)的最大吸附量分别为53.5、62.4和386.2mg·g-1.
Epichlorohydrin, ethylenediamine and triethylamine were used to chemically modify wheat straw. The properties of modified wheat straw were studied, and its adsorption performance and effect on NO3-, PO43- and Cr2O72- in water were investigated. The results showed that the modified wheat straw introduced a positively charged amine group, which can significantly improve the adsorption capacity of the anion.The modified wheat straw dosage, pH value, adsorption time and temperature have a great influence on the adsorption performance, The adsorption process accorded with pseudo-second-order kinetic equation and Langmuir isotherm model. The maximum adsorption amount of NO3-, PO43- (P) and Cr2O72- (Cr) by modified straw was 53.5, 62.4 and 386.2 mg · g-1 .