ZnxCd1−xS for photocatalytic degradation of landfill leachate and its hydrogen production activity
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摘要: 采用共沉淀法在常温下合成了具有高光催化活性的ZnxCd1-xS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,ZnxCd1-xS光催化剂的降解及产氢性能最优;在常温条件下,Zn0.5Cd0.5S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Zn0.5Cd0.5S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1533 µmol,产氢速率可达8312 µmol/(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。Abstract: ZnxCd1−xS solid solution photocatalysts with high photocatalytic activity were prepared by the coprecipitation method at room temperature. The optimum process conditions of ZnxCd1−xS 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 ZnxCd1−xS exhibits the highest photocatalytic activity with Zn∶Cd = 1∶1. Moreover, when the concentration of Zn0.5Cd0.5S 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, Zn0.5Cd0.5S was applied to decompose degraded LFL to produce hydrogen. When the input amount of Zn0.5Cd0.5S is 0.6 g/L and illumination time is 3 h, the maximum hydrogen production is 1533 µmol, and the H2 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 above 83% of the initial hydrogen production.
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Key words:
- ZnxCd1−xS /
- photocatalyst /
- landfill leachate /
- degradation /
- hydrogen production
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表 1 光催化分解纯水及LFL的产氢性能
Table 1 Photocatalytic H2 production of pure water and landfill leachate
Object H2 production/µmol H2O 601 LFL(before) 620 LFL(after) 1533 Note: LFL ( before ) represents landfill leachate without photocatalytic degradation, LFL ( after ) represents the landfill leachate after photocatalytic degradation -
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