CIESC Journal ›› 2018, Vol. 69 ›› Issue (9): 3869-3878.DOI: 10.11949/j.issn.0438-1157.20180186

Previous Articles     Next Articles

Synergetic effect of Ru and Cu on catalytic wet oxidation of ammonia-wastewater

GENG Lili1, YANG Kaixu2, ZHANG Nuowei2, CHEN Binghui1,2   

  1. 1. Department of Chemistry and Applied Chemistry, Changji University, Changji 831100, Xinjiang, China;
    2. College of Chemistry and Chemical Engineering, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2018-02-09 Revised:2018-06-18 Online:2018-09-05 Published:2018-09-05
  • Supported by:

    supported by the Educational Commission of Xinjiang (XJEDU2016S083) and the Natural Science Foundation of Fujian Province (2015J05031).

Ru和Cu协同催化湿式氧化处理氨氮废水

耿莉莉1, 杨凯旭2, 张诺伟2, 陈秉辉1,2   

  1. 1. 昌吉学院化学与应用化学系, 新疆 昌吉 831100;
    2. 厦门大学化学化工学院, 醇醚酯化工清洁生产国家工程实验室, 福建 厦门 361005
  • 通讯作者: 张诺伟, 陈秉辉
  • 基金资助:

    新疆维吾尔自治区高校科研计划项目(XJEDU2016S083);福建省自然科学基金项目(2015J05031)。

Abstract:

RuCu/TiO2 bimetallic catalysts which were prepared via chemical reduction methods and the synergetic effect between Ru and Cu in the detoxification of ammonia-wastewater to nitrogen via catalytic wet air oxidation (CWAO) were investigated. The results showed that the addition of Cu in Ru/TiO2 can effectively improve the selectivity of N2, while the presence of Ru in Cu/TiO2can greatly enhance the catalytic activity of the catalyst. The catalyst (1Ru2Cu/TiO2) with 1% and 2% loading of Ru and Cu has the best catalytic performance among the prepared catalysts. With the reaction conditions of 0.5 MPa,150℃,[NH3]0=1000 mg·L-1,pH=12 and the application to the simulated wastewater was about 33 L·(kg cat)-1·h-1, 1Ru2Cu/TiO2 achieved 87.7% ammonia conversion and 85.9% N2 selectivity. The characterization results demonstrated that the synergetic effect of Ru and Cu played a key role in the catalytic of the ammonia to nitrogen, mainly reflects in the following:the strong interaction between Ru and Cu results in good anti-leaching of 1Ru2Cu/TiO2 catalyst, leading to excellent stability for the catalyst. The electron transfer between Ru and Cu makes 1Ru2Cu/TiO2 has a moderate oxygen affinity, which has effectively enhanced the catalytic activity of the catalyst.

Key words: RuCu/TiO2, catalytic wet air oxidation, ammonia-wastewater, synergetic effects, nanomaterials, catalysis, degradation

摘要:

采用化学还原法制备了RuCu/TiO2双金属催化剂,并探究了Ru和Cu的协同作用对催化湿式氧化(CWAO)无害化处理氨氮废水催化性能的影响。研究结果表明,Cu的添加可有效改善Ru/TiO2催化剂的N2选择性,而Ru的存在可有效提高Cu/TiO2催化剂的催化活性。反应条件为0.5 MPa、150℃、[NH3]0=1000 mg·L-1、pH=12、模拟废水处理量为33 L·(kg cat)-1·h-1时,1Ru2Cu/TiO2能使废水的氨氮转化率和N2选择性分别高达87.7%和85.9%。表征结果表明:Ru和Cu的协同在催化氧化氨氮废水过程中起了关键作用,主要体现在:Ru和Cu的强相互作用导致1Ru2Cu/TiO2催化剂具有良好的抗流失性能,进而使得催化剂具有良好的稳定性;Ru和Cu的电子转移使得1Ru2Cu/TiO2具有适中的亲氧性能,有效提高了催化剂的催化活性。

关键词: RuCu/TiO2, 催化湿式氧化, 氨氮废水, 协同作用, 纳米材料, 催化(作用), 降解

CLC Number: