Zn_(x)Cd_(1-x)S光催化降解垃圾渗滤液及其产氢性能研究  

Zn_(x)Cd_(1-x)S for photocatalytic degradation of landfill leachate and its hydrogen production activity

作　　者：张腾[1] 蒋灶 杨政鑫 徐龙君 刘成伦[1,2] ZHANG Teng;JIANG Zao;YANG Zheng-xin;XU Long-jun;LIU Cheng-lun(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [2]重庆大学化学化工学院,重庆400044

出　　处：《燃料化学学报》2022年第10期1299-1306,共8页Journal of Fuel Chemistry and Technology

基　　金：重庆市中小学生创新人才培养计划(CY210120)资助。

摘　　要：采用共沉淀法在常温下合成了具有高光催化活性的Zn_(x)Cd_(1-x)S固溶体光催化剂,研究了其在模拟光下降解垃圾渗滤液(LFL)的最佳工艺条件和光催化分解废水的产氢性能,以及Zn原子含量、光催化剂的投入量和光照时间对LFL中COD去除率及产氢速率的影响。结果表明,当Zn∶Cd=1∶1时,Zn_(x)Cd_(1-x)S光催化剂的降解及产氢性能最优;在常温条件下,Zn_(0.5)Cd_(0.5)S投入量为1.0 g/L,光照3 h时,渗滤液中COD的去除率最高可达30.85%。使用Zn_(0.5)Cd_(0.5)S对降解后的垃圾渗滤液进行光催化分解产氢,当投入量为0.6 g/L,光照3 h的产氢量为1533μmol,产氢速率可达8312μmol/(g·h),明显高于光催化分解纯水制氢的产氢量;经过三次产氢循环后,其产氢量仍能保持在初始产氢量的83%以上。Zn_(x)Cd_(1-x)S solid solution photocatalysts with high photocatalytic activity were prepared by the coprecipitation method at room temperature.The optimum process conditions of Zn_(x)Cd_(1-x)S photocatalyst for degradation of landfill leachate(LFL) under simulated light and the hydrogen production rate for decomposition of degraded LFL were investigated,including the effects of Zn atom content,the amount of photocatalyst and illumination time on COD removal efficiency and hydrogen production performance.Results show that Zn_(x)Cd_(1-x)S exhibits the highest photocatalytic activity with Zn∶Cd = 1∶1.Moreover,when the concentration of Zn_(0.5)Cd_(0.5)S is 1.0 g/L,and reaction time is 3 h,the COD removal efficiency of LFL can be up to 30.85% at room temperature.At the same time,Zn_(0.5)Cd_(0.5)S was applied to decompose degraded LFL to produce hydrogen.When the input amount of Zn_(0.5)Cd_(0.5)S is 0.6 g/L and illumination time is 3 h,the maximum hydrogen production is 1533 μmol,and the H_(2) production rate is 8312 μmol/(g·h).The hydrogen production obtained in this process is much higher than that of photocatalytic decomposition of pure water.After three recycles,the hydrogen production can still remain above83% of the initial hydrogen production.

关 键 词：Zn_(x)Cd_(1-x)S 光催化剂 垃圾渗滤液 降解 产氢 

分 类 号：X703.1[环境科学与工程—环境工程]