双氯芬酸的吸附去除过程与机制

Adsorption removal process and mechanism of diclofenac

研究了非甾体抗炎药双氯芬酸的吸附去除过程与机制。对吸附处理效果较好的活性炭与纳米羟基氧化铁(α-FeOOH)进行了比表面积、Zeta电位等表面特性的表征,研究比较了双氯芬酸在活性炭与α-FeOOH 2种材料上的吸附去除效果与吸附机制。结果表明,在相同的实验条件下,活性炭与α-FeOOH对双氯芬酸吸附去除率可分别达到97.9%和84.3%;双氯芬酸在活性炭上的吸附主要是由于活性炭较大的比表面积与疏水分配作用,在α-FeOOH上的吸附主要是由于静电引力作用;活性炭与α-FeOOH对双氯芬酸的吸附去除效果均随pH的升高而降低;在pH=6时,活性炭与α-FeOOH对双氯芬酸钠的吸附等温线均符合Langmuir方程,单位饱和吸附量分别为109.98 mg/g和58.96 mg/g;活性炭对双氯芬酸具有更强的吸附能力。

The adsorption process and mechanism of diclofenac （an anti-inflammatory drug）on activated carbon and nano-sized α-FeOOH was studied. The physicochemical properties of these two types of materials were characterized. Results suggested that the removal efficiency of diclofenac by the activated carbon and α- FeOOH was 97.9% and 84.3% , respectively. The sorption of diclofenac by activated carbon was attributed to the larger specific surface area as well as hydrophobic partition effect, while electrostatic attraction was the pri- mary mechanism when the α-FeOOH was used. The adsorption capacity of diclofenac decreased as the pH in- creased for both of the activated carbon and α-FeOOH. When pH = 6, the adsorption isotherm of these two types of adsorbents both fitted the Langmuir isotherm model well, and compared to α-FeOOH, the activated carbon had higher adsorption capability, the saturated adsorption amount was 108.96 mg/g, whereas 59.76 mg/g by the α- FeOOH.