摘要
以γ-Al_2O_3为载体,过渡金属离子Mn、Ni为活性组分,通过共浸渍法制备负载有二元金属氧化物的催化剂Mn-Ni/γ-Al_2O_3,利用XRD、XRF和BET对催化剂进行了分析与表征。采用响应面法优化Mn-Ni/γ-Al_2O_3催化臭氧深度处理制浆废水工艺,并考察了催化剂的稳定性和重复使用性能。结果表明:Mn、Ni成功负载到了γ-Al_2O_3表面及内部孔道,负载后催化剂的粒径减小,比表面积、孔容和平均孔径分别降低了11.96%,16.48%和5.28%;在p H值8.7、催化剂用量9.2 g/L、臭氧质量浓度29.6 g/L的最佳工艺条件下,将Mn-Ni/γ-Al_2O_3(Mn与Ni的物质的量比为6∶4)用于催化臭氧深度处理废水,40℃恒温处理30min后废水CODCr的去除率达75.1%,AOX去除率达85.98%;催化剂重复使用6次时,CODCr的去除率仍达70.6%,并且反应过程中Mn、Ni离子溶出量始终保持在1 mg/L以下,表明Mn-Ni/γ-Al_2O_3具有较高的稳定性和较好的重复使用性能。
A loading binary metal oxide Mn-Ni/γ-Al2O3catalyst was synthesized with γ-Al2O3 as support and with the transition metals Mn, Ni as active ingredients. The catalyst was characterized by XRD, XRF, BET. Then the catalyst was used for the ozonation advanced treatment of pulping effluent. The relationship between wastewater CODer and affecting factors was established via the response surface analysis with Box-Behnken mathematical model. The results showed that the Mn and Ni were loaded on the surface and in the internal hole-channel successfully; After the load of these metals, the particle size decreased, and the specific surface area, pore volume and average pore size decreased by 11.96%, 16. 48% and 5.28% respectively. The optimal condition for treatment was initial pH 8. 7, catalyst dosage 9. 2 g/L and ozone concentration 29. 6 mg/L. Under this condition, the removal rates of CODcr and AOX with Mn-Ni/γ-Al2O3（mole ratio of Mn and Ni 6： 4） as catalyst were 75. 1% and 85.98% after 30 min treatment （40 ℃ ）. Furthermore, the removal rate for this catalyst still reached 70. 6% after being repeatedly used for 6 times. And the ionic releases of Mn and Ni was remained below 1 mg/L during the reaction, indicating of the high stability and good performance of the Mn-Ni/γ-Al2O3 catalyst had for repeated use.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2017年第6期56-64,共9页
Chemistry and Industry of Forest Products
基金
国家水体污染控制与治理科技重大专项(2014ZX07213001)
