Enhanced electrochemical nitrate removal from groundwater by simply calcined Ti nanopores with modified surface characters  

作　　者：Yuan Meng Wanli Tan Shuang Lv Fang Liu Jindun Xu Xuejiao Ma Jia Huang 

机构地区：[1]China First Highway Xiamen Engineering Co.Ltd,Xiamen 361000,China [2]School of Art and Architecture,Xiamen Xingcai Vocational&Technical College,Xiamen 361000,China [3]Institute of Transportation,Inner Mongolia University,Hohhot 010040,China [4]School of Engineering and Built Environment,Griffith University,Brisbane 4111,Australia [5]Department of Environmental Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第11期74-85,共12页中国化学工程学报（英文版）

基　　金：supported by the Inner Mongolia Natural Science Foundation(2024MS02012);the College Students Innovation and Entrepreneurship Training Program(2024J00131);the Inner Mongolia Autonomous Region Education Science Research“14th Five-Year Plan”Project(NGJGH2022411).

摘　　要：A simple and convenient preparation method with high catalytic reduction activity is crucial for the remediation of nitrate contamination.In this study,the innovation for fabricating a nanoelectrode was developed by calcinating the anodized plate to alter the surface crystalline phase of the material.The prepared calcined Ti nanopores(TNPs)electrode could effectively remove up to 95.1%nitrate from simulated groundwater at 30 mA·cm^(-2)electrolysis for 90 min,while under the same conditions,the removal efficiency of nanoelectrode prepared by conventional methods was merely 52.5%.Scanning electron microscopy images indicated that the calcined TNP nanoelectrode was porous with different pore sizes.The higher nitrate removal efficiency of TNPs-500(95.1%)than TNPs-400(77.5%)and TNPs-550(93.4%)may resulted from the positive nonlinear response of the larger electrochemical active surface area,the improved electron transfer and suitable surface structure,and not the“anatase-torutile”of surface TiO_(2)nanotubes.After 90 min of electrolysis,using RuO_(2)as an anode and adding 0.3 g·L^(-1)NaCl solution,87.5%nitrate was removed,and the by-products(ammonia and nitrite)were negligible.Increased temperature and alkaline conditions can enhance the nitrate removal,while higher initial nitrate concentration only improved the nitrate removal slightly.Moreover,The TNPs-500 electrode also exhibited excellent nitrate removal performance in real groundwater with the efficiency at 82.9%and 92.1%after 90 and 120 min,which were 0.87(removal efficiency=95.1%),0.92(removal efficiency=100%)of the efficiency for simulated groundwater,indicating the widely applicable conditions of the TNPs-500 electrode.This approach of surface-bonded elements and structure modification through calcination significantly improves catalytic activity and will guide the simple designing of functional nanostructured electrodes with wide application conditions.

关 键 词：Nitrate reduction ELECTROCHEMISTRY CALCINATION GROUNDWATER NANOMATERIALS Environment 

分 类 号：O643.36[理学—物理化学] O646[理学—化学] X523[环境科学与工程—环境工程]