CAJ | 학술논문

以4A和13X分子筛为吸附材料，考察废水pH值和Cd2＋初始浓度等对Cd2＋去除率的影响，并研究了分子筛对Cd2＋的吸附性能。结果表明，4A和13X分子筛投加量为0．16 g/L、废水pH值为5、Cd2＋浓度为20 mg/L时，Cd2＋去除率达到95％以上；分子筛对Cd2＋的去除机理以离子交换吸附为主，交换出来的Na＋与分子筛吸附的Cd2＋摩尔浓度比为2；在吸附热力学和动力学方面，4A和13X分子筛均符合Langmuir吸附等温模型和Lagergren二级速率方程，计算的饱和吸附容量 Q0分别为150．15、163．67 mg/g ，二级反应速率常数K2分别为2．45×10-3、3．96×10-4 g/（mg · s）。该吸附反应是一种单分子层反应速度较快的化学吸附过程。
이4A화13X분자사위흡부재료，고찰폐수pH치화Cd2＋초시농도등대Cd2＋거제솔적영향，병연구료분자사대Cd2＋적흡부성능。결과표명，4A화13X분자사투가량위0．16 g/L、폐수pH치위5、Cd2＋농도위20 mg/L시，Cd2＋거제솔체도95％이상；분자사대Cd2＋적거제궤리이리자교환흡부위주，교환출래적Na＋여분자사흡부적Cd2＋마이농도비위2；재흡부열역학화동역학방면，4A화13X분자사균부합Langmuir흡부등온모형화Lagergren이급속솔방정，계산적포화흡부용량 Q0분별위150．15、163．67 mg/g ，이급반응속솔상수K2분별위2．45×10-3、3．96×10-4 g/（mg · s）。해흡부반응시일충단분자층반응속도교쾌적화학흡부과정。
With 4A and 13X molecular sieves as adsorption materials ,the effects of the pH value of waste water and the initial concentration of Cd2+ on Cd2+ removal rate were investigated and the sieves’ adsorption of Cd2+ was studied .The results show that ,at the 0 .16g/L of dosing quantity of 4A and 13X molecular sieves ,5 of initial pH and 20 mg/L of Cd2+ concentration ,Cd2+ removal rate reaches 95% or more .The primary mechanism of Cd2+ removal by molecular sieves is ion exchange adsorption .The molar concentration ratio between exchanged Na + and Cd2+ adsorbed by the sieves is 2∶ 1 ,In adsorption thermodynamics and dynamics ,4A and 13X molecular sieves conform to the Langmuir adsorption isothermal model and Lagergren secondary rate equation ,respectively .The sat-urated adsorption capacities are 150 .15 mg/g and 163 .67 mg/g ,and the secondary reaction rate con-stants are 2 .45 × 10 -3 g/(mg · s) and 3 .96 × 10-4 g/(mg · s) ,respectively .It is also found that the adsorption reaction is a fast single molecular layer chemical process .