Structural transformations at semiconductor-metal transition

Лазарев, В. Б.; Shevchenko, Vitaly

doi:10.1016/0025-5408(78)90126-5

Cited by 1 publication

(2 citation statements)

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“…The degree of this covalent bond is determined by the nature of the cation bound to the oxygen atom. This shows that the bond O-Me n+ in functional group Si-O-Me n+ should have some covalence, the degree of which increases with an increase in the acceptor ability of the metal ion [100]. This happens due to competition between the ions of metal and silicon for the free electron pair on the oxygen atom.…”

Section: Discussionmentioning

confidence: 97%

“…As early as 1960, it was considered, starting with the scientist Pauling, that there might be a pπ-dπ interaction between silicon atoms and elements which have free electron pairs. It has been identified that there is an extra π-interaction in siloxane bonds SiO, which is the cause of significant covalence of this bond [97][98][99][100]. The degree of this covalent bond is determined by the nature of the cation bound to the oxygen atom.…”

Section: Discussionmentioning

confidence: 99%

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Investigation on Applying Biodegradable Material for Removal of Various Substances (Fluorides, Nitrates and Lead) from Water

Albrektienė-Plačakė,

Bazienė,

Gargasas

2023

Materials

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Sapropel was used as a biodegradable material for water treatment. Sapropel is a sedimentary layer of a mix of organic and inorganic substances accumulated in the bottoms of lakes for thousands of years. It is a jelly-like homogeneous mass and has properties of sorption. Sapropel is used as a biosorbent and an environment-friendly fertiliser, and it is used in building materials and in the beauty industry as well. In water, there are abundant various solutes that may cause a risk to human health. Such substances include fluorides, nitrates and lead in different sources of water. The goal of this investigation is to explore and compare the efficiencies of removal of different pollutants (fluorides, nitrates and lead) from aqueous solutions upon using sapropel as a sorbent. In this research, various doses of sapropel (0.1, 0.5, 1, 5, 10, 20, 50, 100 and 200 g/L) and various mixing times (15, 30, 60, 90 and 120 min) were used for removal of fluorides, nitrates and lead from aqueous solutions. It was found that the maximum efficiency (up to 98.57%) of lead removal from aqueous solutions by sapropel was achieved when the minimum doses of it (0.1 and 0.5 g/L) were used. The most efficient removal of fluorides (64.67%) was achieved by using 200 g/L of sapropel and mixing for 120 min. However, sapropel does not adsorb nitrates from aqueous solutions.

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Section: Discussionmentioning

confidence: 97%