TiO_2纳米管阵列膜制备及用于光催化氧化深度处理造纸废水  

Preparation of TiO_2 Nanotube Arrays and Advanced Treatment of Papermaking Wastewater by Photocatalytic Oxidation

作　　者：宋树芳 陈小泉[1] 彭向阳 沈文浩[1] SONG Shu-fang;CHEN Xiao-quan;PENG Xiang-yang;SHEN Wen-hao(State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《造纸科学与技术》2018年第2期51-57,共7页Paper Science & Technology

基　　金：广东省科技计划专项项目(2015A020215012);广州市科技计划项目(201607010050);制浆造纸工程国家重点实验室研究基金项目(2015C05)

摘　　要：采用电化学阳极氧化法在纯钛板表面制备了高度有序的TiO_2纳米管阵列膜(TANs)。考察了氧化电压、氧化时间和电解液含水量等参数对TANs形貌的影响,采用SEM和XRD对TANs形貌和晶型进行表征。通过模拟浅池反应器,研究絮凝-光催化氧化深度处理造纸废水的效果,分析不同纳米管长度对造纸废水CODCr去除效果的影响。结果表明:在一定范围内,TiO_2纳米管形貌参数(管径、管长)与氧化电压和氧化时间呈线性关系;经450℃焙烧2 h后的TNAs晶型完全为锐钛矿型;生化后的造纸废水经聚铝(PAC)絮凝预处理,用制备的TANs光催化降解CODCr去除率为53.0%,CODCr降至40 mg/L。另外,研究结果表明:当TNAs管长接近光线渗透深度时,会表现出最好的光催化效果,在该研究中TNAs管长为1500 nm时光催化氧化深度处理造纸废水的效果最好。Highly ordered TiO2 nanotube arrays （TNAs） were fabricated via the electrochemical anodic oxidation process. The effects of applied anodization potential, anodization time and electrolyte water content on the microstructure of nanotubes were investigated with SEM. The crystalline phase was characterized with XRD. The papermaking wastewater was treated through photocatalytic oxidation process,in which the TNAs were used as the photocalyst and the wastewater went through the pretreatment by the flocculation of polyaluminium chloride （PAC）. The effect of the length of titanium nanotube on the photocatalytic degradation was evaluated. The results showed both the tube diameter and the tube length had a linear relation with anodization voltage and anodization time within a certain range. TNAs calcined at 450℃ for 2h was pure anatase phase. The highest removal rate of CODcr after photocatalytic reaction reached 52.94% when the nanotube length was 1500 nm and the CODcr was reduced to 40 mg/L. On the other hand, the study found that the TNAs showed up the best photocatalytic activity when the actual tube length was near the Penetration denth of UV light.

关 键 词：TiO2纳米管阵列膜 阳极氧化 形貌控制 造纸废水 絮凝-光催化氧化 

分 类 号：X793[环境科学与工程—环境工程]