Abstract
The purpose of the article is to research the mechanism of gold-thiocarbamide complex sorption by activated carbons by studying the properties of the resulting electric double layer. The study of the electric double layer of coal sorption surface is conducted using a polar conductometric method based on the simultaneous use of polarization dependences on direct current and conductometric measurements on alternating current. It is shown that the sorption of thiocarbamide complexes of gold occurs more intensively at the cathodic values of sorbent potentials. Dependence of the adsorption value on the potential is actually linear in the negative region from 0.05 to 0.2 V. The absolute value of goldthiocarbamide sorption at the negative sorbent potential of 0.2 V coincides with the maximum values of the polarization current for direct current and conductivity for alternating current. The electrochemical reduction reaction of thiocarbamide compounds results in the formation of neutral thiocarbamide molecules, it might be the reason for gold deposition in a metallic form on the surface of the carbon sorbent. Neutralization of active compounds in the electric double layer creates conditions for the activation of positively charged gold ions directing to the negatively charged sorbent surface. The anodic region of sorbent polarization is characterized by the maximum values of gold ion sorption at the positive potential of 0.2 V. In this case the sorbent surface should be recharged, since in the same region of the potential the maximum AC conductivity is observed. Such conditions should lead to the destruction of the thick part of the electric double layer and, consequently, create favorable sorption conditions. The conducted studies allowed to derive a conclusion that the sor ption of gold-thiocarbamide complexes by activated carbons is significantly influenced by the sorbent potential. The use of the polar conductometric method for studying the electric double layer makes it possible to explain the features of given compound sorption on activated carbons.
Highlights
The purpose of the article is to research the mechanism of gold-thiocarbamide complex sorption by activated carbons by studying the properties of the resulting electric double layer
In this case the sorbent surface should be recharged, since in the same region of the potential the maximum AC conductivity is observed. Such conditions should lead to the destruction of the thick part of the electric double layer and, create favorable sorption conditions
The conducted studies allowed to derive a conclusion that the sor ption of gold-thiocarbamide complexes by activated carbons is significantly influenced by the sorbent potential
Summary
Резюме: Цель – изучение механизма сорбции тиокарбамидных комплексов золота активированными углями путем исследования свойств возникающего двойного электрического слоя. Для исследования двойного электрического слоя сорбционной поверхности углей был принят полярокондуктометрический метод, основанный на одновременном использовании поляризационных зависимостей на постоянном токе и кондуктометрических измер ений на переменном токе. Что сорбция тиокарбамидных комплексов золота происходит более инте нсивно при катодных значениях потенциалов сорбента, а в отрицательной области от 0,05 до 0,2 В зависимость величины адсорбции от потенциала имеет фактически линейный характер. Для анодной области поляризации сорбента характерны максимальные значения сорбции ионов золота при положительном потенци але 0,2 В, при этом должна быть перезарядка поверхности сорбента, т.к. Такие условия должны приводить к разрушению плотной части двойного электрического слоя и, следовательно, созданию благоприятных условий для сорбции. Исследование двойного электрического слоя при сорбции золота из тиокарбамидных растворов на активированные угли.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
