光激发下硝酸纤维素膜降解对乙酰氨基酚的光解影响

硝酸纤维素膜(NCM)作为一种新型环保材料，在光激发下可产生强氧化性的羟基自由基，促进污染物降解. 为研究NCM对对乙酰氨基酚(APAP)的光解效果及影响因素，采用模拟太阳光源，考察了3种反应体系、光谱区间、APAP浓度、光照强度、温度、溶液pH以及水体成分等因素对光解效果的影响. 结果表明:APAP在纯水中几乎不发生光解，而在NCM体系中其光解速率常数为2.85×10?3 min?1；模拟太阳光源的UVA、UVB和可见光(Vis)波段均能促进APAP的光解，其中UVA波段对APAP光解的贡献最大. APAP的光解速率与其浓度呈负相关，低浓度APAP的光解效果更好. 在一定范围内，APAP光解速率与光照强度呈正相关，且随反应温度的增加而增大. 弱碱性环境更有利于APAP的光解，当pH=8.0时，APAP降解率为73.72%，降解效果最佳. 水体中NO₃?、Cl?、SO₄2?、CO₃2?、Mg2+、Ca2+和可溶性有机质(DOM)浓度的增加可以促进NCM对APAP的光解. 研究显示，光激发下利用NCM降解APAP反应迅速且效果显著，可为APAP的去除提供一种新方法. 

Influence of Photolysis on Acetaminophen via Nitrocellulose Membrane under Photoexcitation

Nitrocellulose membranes (NCM), which is a novel material for degrading organic pollutants, can generate strong oxidizing hydroxyl radicals under photoexcitation to promote the degradation of contaminants. To investigate the photolysis effect of NCM on acetaminophen (APAP) and the influencing factors, the effects of three reaction systems, spectral interval, APAP concentration, light intensity, temperature, solution pH and water composition were investigated by using a simulated solar light source. The results showed that APAP in pure water was almost non-photodegradable, while the photolysis rate in NCM system was 2.85×10?3 min?1. The UVA, UVB and visible light (Vis) bands of the simulated solar light source promoted photolysis, while the UVA band contributed the most to the photolysis of APAP. The photolysis rate of APAP was negatively correlated with its concentration, and the photolysis effect was better for lower concentrations of APAP. Within a certain range, it was positively correlated with the light intensity and increased with the increase of the reaction temperature. The weak alkaline environment was more favorable for APAP photolysis, and the degradation rate was 73.72% at pH=8.0. The increased concentrations of NO₃?, Cl?, SO₄2?, CO₃2?, Mg2+, Ca2+ and DOM in water could promote the photolysis of APAP by NCM. The research showed that the degradation of APAP by NCM under light excitation is rapid and effective, providing a new method for the removal of APAP.