部分水解聚丙烯酰胺在铝镁氢氧化物上的吸附

研究了部分水解聚丙烯酰胺（ＰＨＰＡ）在具有永久正电荷的铝镁氢氧化物（ＡＭＨ）上的吸附，考察了水解度（α）、ｐＨ、离子强度和温度等因素的影响．发现水解度增大，吸附量降低，ｐＨ增大，水解度低的样品ＰＨＰＡ１（α＝２．４％）的吸附量增大，而水解度高的样品ＰＨＰＡ２（α＝１０．８％）和ＰＨＰＡ３（α＝４１．２％）的吸附量降低．电解质使ＰＨＰＡ１的吸附量降低，而使ＰＨＰＡ２的吸附量升高．温度升高，ＰＨＰＡ的吸附量也升高，说明吸附是吸热过程．对吸附机理进行了探讨．

ADSORPTION OF PARTIAL HYDROLYZED POLYACRYLAMIDE ON ALUMINUM-MAGNESIUM HYDROXIDE

The adsorption of partial hydrolyzed polyacrylamide (PHPA) on aluminum magnesium hydroxide (AMH) possessing permanent positive charges and effects of degree of hydrolysis(α),pH, ionic strength and temperature have been studied. The presence of mutilayer adsorption of PHPA on AMH is found, and the amount of adsorption (A) decreases with increasing α of PHPA. With increasing pH the A of PHPA with lower α such as sample PHPA1 (α=2.4%) increases and however the A of PHPA with higher α such as samples PHPA2(α=10.8%) and PHPA3(α=41.2%) decrease. The presence of NaCl may reduce the A of PHPA1 but may raise the A of PHPA2. The increase of temperature may raise the A of PHPA, which indicates that the adsorption processes studied are endothermic. The mechanism of adsorption has been discussed in the paper. According to the experimental results,in is inferred that the adsorptive force between flexible polymer moleculae and adsorbent has a optimum range in which the amount of adsorption is maximum.When the adsorptive force is too strong,the amount of adsorption will be lower because the adsorbed flexible moleculae may be spreed.Of course,when the adsorptive force is too weak,the amount of adsorption will be lower also.