Abstract:

The effects of the four adsorbents：activated carbon,artificial zeolite,Al₂O₃ and home-made zeolite molecular sieve on the adsorption of NH⁴⁺-N from wastewater are investigated. The results show that home-made zeiolite molecular sieve has the best adsorption rate. Using the home-made zeolite molecular sieve as carrier,the zeolite molecular sieve Bi₂O₃ has been prepared with the Bi₂O₃ whose loading mass fraction is 10%. Under the following conditions：at room temperature,pH=7,reaction time 1.5 h and in the presence of H₂O₂,the NH⁴⁺-N removing rate from wastewater by using the zeolite molecular sieve-Bi₂O₃ reaches 87.4%. The zeolite molecular sieve-Bi₂O₃ can be used repeatedly. Furthermore,after the catalyst has been used 6 times,its NH⁴⁺-N removing rate still can reach above 70%.

Key words: molecular sieves, adsorption, catalytic oxidation

摘要：

首先通过试验考察了活性炭、合成沸石、Al₂O₃、自制沸石分子筛4种吸附剂对排放废水中NH⁴⁺-N的吸附效果。结果表明,自制沸石分子筛对NH⁴⁺-N的吸附效果最好。以自制沸石分子筛为载体,负载质量分数为10%的Bi₂O₃制备Bi₂O^3-沸石分子筛。在常温、反应时间为1.5 h、pH=7、H2O2存在的条件下,Bi₂O₃-沸石分子筛对废水中的NH⁴⁺-N去除率达到87.4%,并且在重复使用6次后,Bi₂O₃沸石分子筛对NH⁴⁺-N的去除率仍可达70%以上。

关键词: 分子筛, 吸附, 催化氧化

CLC Number: 

• X703.1