微波辐照对硫酸铝溶液水解和配聚行为的影响研究

Study on the Hydrolysis and Olation Behaviors of Aluminum Sulfate under Microwave Irradiation

微波辐照具有快速、均匀和节能的特点,已被作为高效的热源广泛用于各种化学反应。通过对微波辐照和在相同条件下进行水浴保温的硫酸铝溶液的pH值、电导率、介电常数和凝胶过滤色谱(GFC)的测定,研究了微波辐照对硫酸铝溶液水解和配聚行为的影响。结果表明,微波辐照和水浴加热都可以促进硫酸铝溶液的水解和配聚作用,但与水浴加热相比,微波实验样溶液的pH值更低,电导率、极性和水解配聚速率更快,溶液中大分子尺寸铝配合物含量更多。以上证据说明,微波辐照对铝鞣液水解和配聚的促进作用可能是其均匀加热的热效应和非热效应共同作用的结果,非热效应的存在使微波辐照对铝溶液的水解和配聚的促进效果更明显。

Microwave irradiation is an excellent heating resource with advantages of fast,uniform and energy-saving,thus it has been widely used in chemical reactions for heating.To take full advantage of this energy in aluminum tanning,herein,the hydrolysis and olation behaviors of aluminum sulfate solutions under microwave irradiation was investigated.Concretely,the aluminum sulfate solutions under microwave irradiation were tested as experimental samples and compared with the corresponding water bath ones as controls,and the pH value,conductivity,dielectric constant and gel filtration chromatography(GFC)were measured for these samples.Results indicate that the hydrolysis and olation can be promoted by both microwave irradiation and water bath heating,but compared with the control samples,microwave irradiation led to the lower pH of aluminum sulfate,higher conductivity and polarity raised.Under microwave,the hydrolysis and olation of aluminum complexes can be fastened,and the complexes component with large molecular size are observed.In conclusion,the promotion effect on hydrolysis and olation of aluminum sulfate under microwave is caused probably by both thermal and non-thermal effect of microwave,and the latter makes the hydrolysis and olation behaviors more significant.