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帝国小经营家

金虫 (小有名气)

[求助] 求助:{010} and {110}晶面的钒酸铋(BiVO4)合成 已有1人参与

我根据“Spatial separation of photogenerated electronsand holes among {010} and {110} crystal facets of BiVO4”这篇论文的合成方法,合成BiVO4.具体合成方法如下:All chemicals were analytical grade and were used without further purification. BiVO4 sample was synthesized by a hydrothermal procedure. Typically, the precursors NH4VO3 (36 mmol) and Bi(NO3)3·5H2O (36 mmol) were dissolved in 300 mL of 2.0 M nitric acid solution, and the pH value of the solution was then adjusted to 2.0 with ammonia solution under stirring until formation of an orange precipitate. After about 2 h aging, the orange precipitate at the bottom of the beaker was transferred to a Teflon-lined stainless steel autoclave with a capacity of 100 mL and hydrothermally treated at 200 oC for 24 h. After the autoclave was cooled to room temperature, a vivid yellow powder was separated by filtration, washed with de-ionized water for more than 3 times, and then dried at 60 oC in air for overnight. 但是得到的形貌与论文相差甚远,不知道哪个环节出问题。现有几个疑问,望大牛们解答:1.调节 pH到2的过程中,我使用pH计边搅拌边测量,是否需要配合精密pH试纸精准控制?    2.调节完pH后,我是直接将沉淀溶液转移到反应釜进行水热反应,而论文中是“orange precipitate at the bottom of the beaker was transferred to a Teflon-lined stainless steel autoclave”,是否需要将沉淀过滤,去除溶液水分,然后转移至反应釜进行反应?或者是存在其他合成过程中需要特别注意的问题,希望大牛们能指点一二,感谢!!!!!!
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星火abcd

至尊木虫 (著名写手)

直接发邮件问作者啊。
没有理想
2楼2019-07-25 22:07:08
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cyz719986425

铁虫 (初入文坛)

【答案】应助回帖

我最近也在尝试合成,参考了好多文献,发现转移量大约为70 ml至100 ml反应釜中,调节PH值我是用的精密PH试纸。但是结果还是不算好,有晶型产生,但是不均匀。
3楼2020-09-17 17:31:49
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