首页> 外文期刊>Journal of Polymers and the Environment >New Schiff-Base's Modified Chitosan: Synthesis, Characterization, Computational, Thermal Study and Comparison on Adsorption of Copper(Ⅱ) and Nickel(Ⅱ) Metal Ions in Aqueous
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New Schiff-Base's Modified Chitosan: Synthesis, Characterization, Computational, Thermal Study and Comparison on Adsorption of Copper(Ⅱ) and Nickel(Ⅱ) Metal Ions in Aqueous

机译:新的Schiff-Base的改良壳聚糖:含水中铜(Ⅱ)和镍(Ⅱ)金属离子在水性中的合成,表征,计算,热研究和比较

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In this paper, four modified chitosan compounds were prepared by reaction between chitosan (CS) and carbonyl groups such as salicylaldehyde (SA), benzaldehyde (BA), para-chloro benzaldehyde (PCBA) and acetanilide (A) as an amide compound. The corresponding Schiff-bases were characterized by FTIR, EDX, FESEM, BET and TGA-DTA techniques. The BET analysis on the prepared Schiff bases shows that the total volume of the pores and their specific surface area is different. The synthesized compounds have got less than 10 nm in diameter. The adsorption of copper and nickel ions in the aqua medium by prepared Schiff bases was studied. A comparison of the adsorption percentage of prepared compounds indicates that Schiff-base CS-A has slightly better adsorption than CS-SA. The calculation of boundary orbital energy (HOMO-LUMO) shows that the chitosan molecule has the highest chemical hardness (eta) and the minimum reactivity to synthesized Schiff-Base compounds. The HOMO-LUMO energy gap of all the adsorbed molecules diminished after the adsorption of metal cations. The adsorption efficiency of Cu(2+)per molar unit changes as: CS-A (92.5%) CS-SA (80.4%) CS-BA (43.2%) CS-PCBA (42.2%) CS (30.5%). The adsorption efficiency of Ni(2+)per molar unit changes as: CS-A (81.8%) CS-SA (59.9%) CS-BA (56.1%) CS-PCBA (46.6%) CS (40.25%). Thus, the modified chitosan compounds by imine bonds are well compounds to adsorption of metal ions.
机译:本文通过壳聚糖(Cs)和羰基(如Salicyldehyde(SA),苯甲醛(Ba),对氯苯苯甲苯胺(PCBA)和乙酰苯胺(A)作为酰胺化合物,制备四种改性的壳聚糖化合物。相应的Schiff-Bases的特征在于FTIR,EDX,FESEM,BET和TGA-DTA技术。对制备的Schiff碱基的BET分析表明,孔的总体积及其比表面积不同。合成的化合物直径少于10nm。研究了制备的Schiff碱基在Aqua培养基中的铜和镍离子的吸附。制备化合物的吸附百分比的比较表明席克碱基Cs-A比CS-SA略微更好地吸附。边界轨道能量(HOMO-LUMO)的计算表明,壳聚糖分子具有最高的化学硬度(ETA)和合成的Schiff-碱化合物的最小反应性。金属阳离子吸附后,所有吸附分子的Homo-Lumo能量隙减少。每磨牙单位Cu(2+)的吸附效率变化为:Cs-A(92.5%)> Cs-SA(80.4%)> Cs-Ba(43.2%)> Cs-PCA(42.2%)> Cs(30.5 %)。每磨牙单位的Ni(2+)的吸附效率变化为:Cs-A(81.8%)> Cs-SA(59.9%)> Cs-Ba(56.1%)> CS-PCA(46.6%)> Cs(40.25 %)。因此,通过亚胺键的改性的壳聚糖化合物是对金属离子吸附的井化合物。

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