Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, Canada P7B 5E1.
Water Environ Res. 2013 Jan;85(1):3-12. doi: 10.2175/106143012x13378023685790.
In this article, photocatalytic degradation of humic acid, a predominant type of natural organic matter present in ground and surface waters, was conducted using a commercial titanium dioxide catalyst under natural sunlight irradiation in a batch photoreactor. Various parameters, such as photocatalyst loading, pH value, irradiation intensity, initial concentration, and illumination time, had a significant influence on humic acid removal. The adsorption isotherm of TiO2 dosage fit to Langmuir's isotherm equation well, and the reaction kinetics of initial dissolved organic carbon (DOC) concentration increased with the increase of TiO2 dosage but decreased with the increase of initial DOC. The mineralization of humic acid revealed that the large molecular weight organics with aromatic and hydrophobic properties were removed, while the most persistent components were the shortest UV-absorbing and hydrophilic low-molecular-weight compounds. This study indicates that the solar/ TiO2 photocatalytic degradation is a promising process for humic acid removal from water.
本文采用商业二氧化钛催化剂，在批式光反应器中利用自然阳光辐照，对天然水体中存在的主要类型天然有机物腐殖酸进行了光催化降解研究。催化剂负载量、pH 值、辐照强度、初始浓度和光照时间等各种参数对腐殖酸去除有显著影响。TiO2 用量的吸附等温线很好地符合朗缪尔等温方程，初始溶解有机碳（DOC）浓度的反应动力学随 TiO2 用量的增加而增加，但随初始 DOC 的增加而降低。腐殖酸的矿化表明，去除了具有芳香性和疏水性的大分子量有机物，而最持久的成分是紫外吸收最短和亲水性的低分子量化合物。本研究表明，太阳能/二氧化钛光催化降解是一种很有前途的去除水中腐殖酸的方法。
