Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, China.
Water Sci Technol. 2012;65(5):948-53. doi: 10.2166/wst.2012.941.
The degradation of 3,4-dihydroxybenzoic acid (3,4-DHBA) in the presence and absence of Pb(2+) under UV illumination was studied. Addition of Pb(2+) caused the formation of precipitate during photoreaction when the solution pH was higher than 6. The presence of Pb(2+) remarkably inhibited the degradation of 3,4-DHBA and its photodegradation intermediates, while complexation of 3,4-DHBA and its photodegradation intermediates with Pb(2+) decreased the free Pb(2+) in aqueous solutions. Molecular oxygen played an important role in photodegradation of 3,4-DHBA in the presence of Pb(2+). UV-Vis spectroscopy was used to investigate the interaction between Pb(2+) and 3,4-DHBA at different pH conditions, and FT-IR was used to characterize the precipitate formed during photoreaction. The mineralization of 3,4-DHBA was investigate by total organic carbon analysis.
在紫外光照射下，研究了 3,4-二羟基苯甲酸（3,4-DHBA）在存在和不存在 Pb(2+) 时的降解情况。当溶液 pH 值高于 6 时，Pb(2+) 的存在会在光反应过程中形成沉淀。Pb(2+) 的存在显著抑制了 3,4-DHBA 及其光降解中间产物的降解，而 3,4-DHBA 及其光降解中间产物与 Pb(2+) 的络合降低了水溶液中游离的 Pb(2+)。分子氧在 Pb(2+)存在下对 3,4-DHBA 的光降解起着重要作用。紫外-可见光谱用于研究不同 pH 条件下 Pb(2+)与 3,4-DHBA 的相互作用，傅里叶变换红外光谱用于表征光反应过程中形成的沉淀。通过总有机碳分析研究了 3,4-DHBA 的矿化。
