Institut national de la recherche scientifique, Université du Québec, Québec, Canada.
Water Sci Technol. 2013;67(10):2141-7. doi: 10.2166/wst.2013.117.
The present work evaluates the potential of the photocatalysis (PC) process for the degradation of butylparaben (BPB). Relatively high treatment efficiency was achieved by comparison to photochemical process. Prior to photocatalytic degradation, adsorption (AD) of BPB occurred on the titanium dioxide (TiO2)-supported catalyst. AD was described by Langmuir isotherm (KL = 0.085 L g(-1), qm = 4.77 mg g(-1)). The influence of angle of inclination of the reactor, pH, recirculation flow rate and initial concentration of BPB were investigated. The PC process applied under optimal operating conditions (recirculation flow rate of 0.15 L min(-1), angle of inclination of 15°, pH = 7 and 5 mg L(-1) of BPB) is able to oxidize 84.9-96.6% of BPB and to ensure around 38.7% of mineralization. The Langmuir-Hinshelwood kinetic model described well the photocatalytic oxidation of BPB (k = 7.02 mg L(-1) h(-1), K = 0.364 L mg(-1)).
本研究评估了光催化（PC）工艺在降解丁基对羟基苯甲酸酯（BPB）方面的潜力。与光化学过程相比，该工艺具有较高的处理效率。在光催化降解之前，BPB 在负载二氧化钛（TiO2）的催化剂上发生吸附（AD）。AD 符合朗缪尔等温线（KL = 0.085 L g(-1)，qm = 4.77 mg g(-1)）。考察了反应器倾斜角度、pH 值、循环流量和 BPB 初始浓度对 AD 的影响。在最佳操作条件下（循环流量为 0.15 L min(-1)，倾斜角度为 15°，pH = 7，BPB 初始浓度为 5 mg L(-1)）下应用 PC 工艺，能够氧化 84.9-96.6%的 BPB，并确保大约 38.7%的矿化度。朗缪尔-欣谢尔伍德动力学模型很好地描述了 BPB 的光催化氧化（k = 7.02 mg L(-1) h(-1)，K = 0.364 L mg(-1)）。
