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[求助]
Au、Ag納米粒子制備時如何避光? 已有1人參與
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以兩篇文章為例 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 ) 1.兩篇文章皆提及,沉積沉淀法制備Au NP,離子交換法制備Ag粒子,需避光制備。文中所言避光指的是什么光?太陽光?燈光?具體避光實驗操作應該如何進行呢? ![]() 2. Ag粒子也可由AgNO3熱分解而來?無需H2還原? 【unexchanged silver exists as metallic species formed by thermal decomposition of AgNO3 during calcination】?Au可從Au2O3任何氣氛下高溫分解而來【干燥樣品(As prepared),金以+3價氧化態(tài)存在。Au2O3不穩(wěn)定,任何氣體下加熱都可還原得到Au0,但是不一定保證所有Au物種都變成Au0,部分陽離子物種也可能存在。通常在373K條件下,Au前提開始分解并還原為Au0】。 |
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