A new one-step, environmentally friendly and economical method for the production of layered double hydroxides

A new one-step, environmentally friendly and economical method for the production of layered double hydroxides

by KeAi Communications Co.

5(CO3)4(OH)24 hours2O, LDH-25, LDH-25-60 and LDH-25-180. Recognition: magnetic resonance letters (2022). DOI: 10.1016/j.mrl.2022.06.004″ width=”800″ height=”530″/>
TEM images of Mg5(CO3)4(OH)24 hours2O, LDH-25, LDH-25-60 and LDH-25-180. Recognition: magnetic resonance letters (2022). DOI: 10.1016/j.mrl.2022.06.004

Layered double hydroxides (LDHs) have a unique structure and many advantages that have led to their widespread use in areas such as catalysis, environmental management, and medical applications. Typically, soluble metal salts such as metal nitrates are used as starting materials for the synthesis of LDHs, but they are relatively expensive and can be inconvenient to store and transport due to their explosive nature.

In a study published in the journal magnetic resonance lettersa group of researchers from China outlines a new synthetic approach they have developed – a one-step manufacturing route for layered double hydroxides that uses basic magnesium carbonate.

According to Luming Peng, a professor at Nanjing University’s School of Chemistry and Chemical Engineering, who led the team, this new process is not only cheaper than existing options, but also offers the potential to increase production. He explains: “Basic magnesium carbonate is a widely used mineral in geology and planetology. It is inexpensive and available in large quantities, making it a perfect option for large-scale production of LDHs.”

In addition, the team believes that the new process is more environmentally friendly. “Traditional manufacturing routes for LDHs require the use of chemicals that have to be manufactured separately, e.g. B. Mg2+ Salts and materials that produce CO32- during synthesis, such as urea,” says Prof. Peng.

“But the basic magnesium carbonate that we use as a starting point produces these naturally. In addition, traditional preparation methods require high temperatures between 60 and 100 degrees Celsius, while our process works at room temperature.”

The team found that when they added caustic soda to a mixture of Al3+ Solution with basic magnesium carbonate, LDHs containing magnesium (Mg) and aluminum (Al) formed rapidly at room temperature, possibly via a dissolution-recrystallization mechanism.

Teacher. Peng says, “The LDHs thus produced are associated with nanosheet morphology and many defects, while LDHs with high crystallinity and few defects can be obtained by high-temperature hydrothermal treatment.”

He adds: “Our study is an innovation in the field of LDH synthesis. We believe it offers a promising avenue for further research and hope that it will support the production of lower cost LDHs for more applications in the near future.”

More information:
Li Jin et al, A green way to produce layered double hydroxides from basic magnesium carbonate, magnetic resonance letters (2022). DOI: 10.1016/j.mrl.2022.06.004

Provided by KeAi Communications Co.

Quote: A new one-step, green and economic way to Preparation layered double hydroxides (2022, November 15), retrieved November 15, 2022 from https://phys.org/news/2022-11-one-step-green- economical-layered-Hydroxide.html

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