有机层状双氢氧化物对水体中腐殖酸的吸附及其影响因素

Study on Adsorption and Impact Factors of Organic Layered Double Hydroxides on Humic Acid in Aqueous Solutions

采用共沉淀法合成了十二烷基苯磺酸钠插层的有机镁铝层状双氢氧化物(LDH-SDBS).对合成的有机LDH-SDBS进行超声震荡,使其比表面积增大,以提高吸附能力.研究了LDH-SDBS对水中腐殖酸的去除效果.结果表明,LDH-SDBS可以有效地去除水中腐殖酸.吸附过程受LDH-SDBS的投加量、竞争性阴离子、温度、吸附时间和溶液的pH值等因素的影响.

In this experiment, organic layered double hydroxides is synthesized using coprecipitation method. Then an ultrasonic treatment is conducted on the synthesized LDH-SDBS to enable it to have a large specific surface area and a better adsorption capacity. Then the synthesized LDH-SDBS is used to remove the humic acid from aqueous solutions with a certain gradient. After adsorption, the concentration of humic acid is measured with a spectrophotometer to determine the adsorption capacity. The adsorption capacity of LDH-SDBS towards HA is found to be relatively high. And the adsorption of humic acid by LDH-SDBS could be affected by many factors, such as adsorbent dosage, competing anions, temperature time, and pH of the solution.