新型介孔脱色剂的制备及脱色性能研究

Preparation and Decolorization of a New Kind of Mesoporous Decolorant

采用挥发诱导自组装技术,以乙醇为溶剂、四甲基氢氧化铵(TMAOH)为结构导向剂,合成了介孔孔径为6.1 nm的新型脱色剂来处理偶氮染料废水。选用活性艳红X-3B和酸性橙Ⅱ为目标污染物,考察了初始pH值、振荡时间和染料初始浓度对介孔脱色剂的性能影响。结果表明,强酸性环境(pH≤2)利于吸附反应的发生,且该脱色剂达到吸附平衡的时间短。在温度为25℃、初始pH值为2、振荡时间为1 h、振荡频率为150 r/min、脱色剂投加量为1 g/L的条件下,对两种染料的饱和吸附量分别可达402.3 mg/g和267.2 mg/g,吸附行为符合Langmuir模型。

Using ethanol as the solvent and tetramethylammonium hydroxide （TMAOH） as the structure-directing agent, a new kind of mesoporous decolorant with pore diameter of 6.1 nm was synthesized via the evaporation-induced self-assembly process to treat azo dyeing wastewater. The effects of initial pH, shaking time and initial dye concentration on the decolorant performance were investigated by using reactive brilliant red X-3B and acid orange Ⅱ as target pollutants. The results show that the adsorption reaction easily proceeds in the strong acid environment （pH ≤2 ）, and the decolorant reaches adsorption equilibrium state within a short time. Under the conditions of reaction temperature of 25℃, initial pH of 2, shaking time of 1 h, s saturated adsorption capacity for the haking frequency of 150 r/min and decolorant dosage of 1 g/L, the both dyes can reach 402.3 mg/g and 267.2 mg/g respectively. In addition, the adsorption pattern conforms the Langmuir adsorption model.