再次求冷冻干燥的相关问题！谢谢！！？貌似你看文献没看懂??这篇文献Insight into the Mechanism of Graphene Oxide Degradation via the Photo-Fenton Reaction的LDI-MS部分并没有说??“这样可以除去衡量的金属离子和无机盐” 老师，这个在讨论里面第一句说了的~~为什么要这样呢？查看更多
羟基自由基的检测？苯甲酸的紫外吸收波长230nm，2，4-二羟基苯甲酸紫外吸收波长是280nm，溶液配个500mg/L的浓度试试 我看文献上说是用的苯甲酸，它的激发波长为312nm，发射波长为425nm，但是我发现苯甲酸本身是不容于水的，并且氧化锌会在碱性或者中性的溶液中发生溶解，我特别想知道它这个苯甲酸是怎么配置的？Estimation of Hydroxyl Radical (?OH). Hydroxyl radicals were estimated using fluorescence spectroscopy. Terephthalic acid (TA)with hydroxyl radicals forms a 2-hydroxyl terephthalic acid complex which gives fluorescence, and its intensity is a direct measure ofhydroxyl radical concentration.21 In a typical procedure, to aqueous suspensions of ZnO (0.1 g/L), 2 mM of TA was added and stirredunder ambient light. At regular intervals, 3 mL aliquots were withdrawn and filtered through a membrane filter and fluorescencewas measured at excitation wavelength of 312 nm. The intensity of emission at 425 nm is correlated to the hydroxyl radical concentration.The experiment was performed in the dark also，查看更多
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