Au、Ag纳米粒子制备时如何避光?以两篇文章为例??甲:Ag-modified zeolite (Ag/HZSM-5) was prepared by ion-exchange of 2.5 g of H-ZSM-5 with 25 mL of 0.15 M AgNO3 aqueous solution overnight at 25°C in the dark with subsequent filtration,19 washing with distilled water, drying at 393 K for 14 h, and further calcination at 673 K for 4 h in a flow of air calcination at 673 K for 4 h乙:All the preparations were performed in the absence of light, which is known to decompose the gold precursors ( deposition–precipitation )1.两篇文章皆提及,沉积沉淀法制备Au NP,离子交换法制备Ag粒子,需避光制备。文中所言避光指的是什么光?太阳光?灯光?具体避光实验操作应该如何进行呢?2. Ag粒子也可由AgNO3热分解而来?无需H2还原?【unexchanged silver exists as metallic species formed by thermal decomposition of AgNO3 during calcination】?? ? Au可从Au2O3任何气氛下高温分解而来【干燥样品(As prepared),金以+3价氧化态存在。Au2O3不稳定,任何气体下加热都可还原得到Au0,但是不一定保证所有Au物种都变成Au0,部分阳离子物种也可能存在。通常在373K条件下,Au前提开始分解并还原为Au0】。查看更多6个回答 . 14人已关注