| 查看: 470 | 回复: 2 | |||
tianwei1332铁杆木虫 (著名写手)
|
[交流]
改变酸度和温度，合成正钒酸盐 已有1人参与
|
|
求解答下面三个问题，谢谢： pH在8～2范围内时,钒酸盐以“多钒酸盐”的形式存在与水溶液中。如果除去水，并在600℃焙烧，应该可以转化为正钒酸盐，是吧？ 另外，如果在上述pH范围内，对钒酸盐进行的水热合成（＞100℃），多钒酸盐也能转化为正钒酸盐，对吗？ 钨酸盐和磷酸盐也类似吧？ |
回复此楼» 猜你喜欢
武汉纺织大学-材料科学与工程学院-姜伟杰青团队-招生物方向调剂
已经有0人回复
-
武汉纺织大学-材料科学与工程学院-招 生物方向 硕士！
已经有0人回复
-
有机高分子材料论文润色/翻译怎么收费?
已经有209人回复
-
武汉纺织大学-材料科学与工程学院-姜伟杰青团队-招生物方向调剂
已经有0人回复
-
[武汉纺织大学]材料学院[姜伟团队名称]课题组-2026年硕士研究生调剂信息
已经有0人回复
-
武汉纺织大学-材料科学与工程学院-姜伟杰青团队-招调剂
已经有0人回复
-
生物医学材料前沿科普：低密度、高孔隙率的“多孔微球”核心技术与应用全景
已经有1人回复
-
湖南工业大学周贵寅组招生物医学工程（学硕07、08都行）、生物与医药（专硕08）硕士生
已经有0人回复
-
湖南工业大学周贵寅组招生物医学工程（学硕07、08都行）和生物与医药（专硕08）硕士生
已经有0人回复
-
考研求调剂
已经有0人回复
-
2026年中南民族大学化学与材料科学学院调剂公告
已经有20人回复
» 本主题相关价值贴推荐，对您同样有帮助:
- 硫酸盐的分解温度一般为多少？
已经有8人回复
2楼2014-11-16 21:32:36
tianwei1332
铁杆木虫 (著名写手)
- 应助: 25 (小学生)
- 金币: 9788.5
- 散金: 258
- 红花: 6
- 帖子: 1761
- 在线: 181.5小时
- 虫号: 628753
- 注册: 2008-10-17
- 专业: 催化化学
|
请看一下下面这两种办法能得到正钒酸盐吗？谢谢指导 Pure t-LaVO4（水热法合成） was prepared through several steps using a hydrothermal method. First, a predetermined amount of La2O3 was dissolved in 6 M HNO3 solution. Then, the obtained La(NO3)3 solution was mixed with 0.4 M NH4VO3 at the V:La mole ratio of 1:1 to form a precipitate, followed by adjusting the pH of the new mixture to 7 with a 2 M NH3 solution and transferring it into a 100-mL Teflon-lined stainless-steel autoclave. The autoclave was sealed and maintained at 180°C for 24 h and then air-cooled to room temperature. The resulting products were filtered, washed with deionized water, and dried at 80°C for 12 h. Pure m-LaVO4（普通沉淀法） was prepared via a precipitation method. Specifically, 20 mL of0.4 M NH4VO3 and 20 mL of 0.4 M La(NO3)3 were used for the mixing and generation of a precipitate. The pH of the mixture was controlled at 5, using a 2 M NH3 solution. After aged at room temperature for 30 min, the precipitate was filtered, washed three times by deionized water, dried at 100 ℃ for 12 h and calcined at 600 °C for 4 h.The LaVO4/g-C3N4 composite catalysts were prepared as follows. LaVO4 and g-C3N4 with given ratios were mixed and ground in an agate mortar for 20 min, and then calcined at 450℃ for 2 h to obtain the LaVO4/g-C3N4 catalyst. The actual LaVO4 concentration was determined with thermogravimetry(TG) experiments (see Figure S1 in the Supporting Information). For simplification, the synthesized LaVO4/gC3N4 composites are denoted as xwt %t-LC or xwt %m-LC,in which xrepresents the LaVO4 concentration. |
3楼2014-11-17 10:39:13
10