Abstract Hydrogen peroxide (H2O2) is potentially an attractive alternative to chlorine-based (hypochlorous acid and monochloramine) antifouling agents in reverse osmosis (RO) because H2O2 does not form toxic disinfection byproducts and is tolerated by polyamide (PA) membranes up to high concentrations. However, aqueous H2O2 solutions are corrosive and iron corrosion products activate H2O2 to reactive oxygen species (ROS) that can degrade the PA separation layer. The impact of iron oxides on membrane stability was studied in the presence of H2O2 in two different systems: a corrosion-resistant system (constructed with plastic components) and an all-steel system. Tests in the all-steel system were conducted under enhanced corroding conditions and in deoionized (DI) water. H2O2 concentrations were 2.0 mM (68 mg/L) or 10 mM (340 mg/L). Corrosion was enhanced by adding 10 mM Cl- or suppressed by adding phosphate buffer. Membrane performance was evaluated by determining salt rejection and the water flux. Under corrosion-suppressed conditions, membranes were stable during the 8-d test. In the all-steel testing system containing 10 mM Cl- ion as corrosion promoter, the membrane tolerance was significantly diminished. In DI water, corrosion was relatively slow but degradation of the membranes was noticeable. Kinetic data of pCBA degradation indicated that membrane damage was caused by ·OH radicals. Quenching of the ·OH radical by methanol, and X-ray photoelectron spectroscopy (XPS) and Scanning Electron Microscopy (SEM) data are consistent with the hypothesis that Fenton reactions caused cleavage of the polyamide cross-linkages.

中文翻译：

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铁对薄膜复合聚酰胺反渗透膜对过氧化氢耐受性的催化作用

摘要 过氧化氢 (H2O2) 是反渗透 (RO) 中氯基（次氯酸和一氯胺）防污剂的潜在替代品，因为 H2O2 不会形成有毒的消毒副产物，并且聚酰胺 (PA) 膜可耐受高达高浓度. 然而，H2O2 水溶液具有腐蚀性，铁腐蚀产物会将 H2O2 活化为活性氧 (ROS)，从而降解 PA 分离层。在 H2O2 存在的情况下，在两种不同系统中研究了氧化铁对膜稳定性的影响：耐腐蚀系统（由塑料部件构成）和全钢系统。全钢系统的测试是在增强腐蚀条件下和去离子 (DI) 水中进行的。H2O2 浓度为 2.0 mM (68 mg/L) 或 10 mM (340 mg/L)。通过添加 10 mM Cl- 或通过添加磷酸盐缓冲液来抑制腐蚀。通过测定脱盐率和水通量来评估膜性能。在腐蚀抑制条件下，膜在 8 天测试期间是稳定的。在含有 10 mM Cl-离子作为腐蚀促进剂的全钢测试系统中，膜耐受性显着降低。在去离子水中，腐蚀相对缓慢，但膜的降解很明显。pCBA降解的动力学数据表明膜损伤是由·OH自由基引起的。甲醇对·OH 自由基的淬灭、X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM) 数据与芬顿反应导致聚酰胺交联断裂的假设一致。