【摘要】 通过醛与单宁等的反应使木麻黄树皮中单宁等组分原位固化,并考察了原位固化木麻黄树皮(YGMS)对稀水溶液中Cr(Ⅵ)的吸附行为。研究结果表明,当m(甲醛):m(树皮)=1:20、m(乙二醛):m(树皮)=1:4和m(戊二醛):m(树皮)=3:25时,固化树皮收率达到95%以上。YGMS对Cr(Ⅵ)的吸附量随溶液pH值的增大而减小,溶液pH=2.01时吸附量最大。随温度升高YGMS对Cr(Ⅵ)的吸附量增大。用甲醛、乙二醛或戊二醛原位固化的木麻黄树皮对Cr(Ⅵ)的平衡吸附量分别为68.0、83.3和82.0mg/g。YGMS对Cr(Ⅵ)的平衡吸附量越大,其拟二级速率常数越小。更多还原

【Abstract】 Tannin in Casuarina equisetifolia bark was in-situ immobilized by reaction of aldehydes and tannin.The adsorption behavior of the in-situ immobilized modified bark to Cr(Ⅵ) in aqueous solution was investigated.The results showed that the recovery yields of the modified barks were higher than 95% when the mass ratios of the bark to fomaldehyde,glyoxal and glutraldehyde were 1:20,1:4 and 3:25,respectively.The maximal adsorption capacity of the bark to Cr(Ⅵ) was achieved at pH = 2.01.The equilibrium adsorption capacity of the barks modified with fomaldehyde,glyoxal and glutraldehyde was 68.0 mg/g,83.3 mg/g and 82.0 mg/g,respectively.The pseudo-second-order rate constant decreased with increases in the equilibrium adsorption capacity.更多还原