Autor: Xu, Yang - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Adsorption Behavior of Glucuronic Acid on Pyrite Surface: an electrochemical and DFT Study
Autorzy:: Ning, Xu Jia
Ying, Yang Hong
Lin, Tong-Lin
Powiązania:: https://bibliotekanauki.pl/articles/355049.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: glucuronic acid
pyrite
adsorption
Opis:: Bacterial adsorption on mineral surface is one of the key steps in bioleaching process. The bacteria adsorb on the mineral surface via the extracellular polymeric substances (EPS) layer. In this paper, the behavior of glucuronic acid, one of the key substances in EPS layer, adsorbed on the pyrite surface is studied using DFT and electrochemical methods. Adsorption capacity of glucuronic acid is stronger than that of water. Glucuronic acid adsorbs on pyrite surfaces and it follows a mixed type of interactions (physisorption and chemisorption). Adsorption of glucuronic acid on pyrite surface followed Langmuir’s adsorption isotherm with adsorption standard free energy of –27.67kJ mol^-1. The structural and electronic parameters were calculated and discussed.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 1; 433-440
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effects of cations on rare earth adsorption and desorption in binding sites of montmorillonite
Autorzy:: He, Zhengyan
Nie, Wenrui
Yang, Huifang
Tang, Yuchen
Sha, Aoyang
Qu, Jun
Xu, Zhigao
Chi, Ruan
Powiązania:: https://bibliotekanauki.pl/articles/24085808.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: adsorption
desorption
external site
interlayer site
basal spacing
Opis:: The exchangeability of rare earth (RE) in weathered crust elution-deposited rare earth ores largely depends on its interaction with clay minerals, which may be significantly influenced by various cations. Therefore, the effects of K+, Ca2+ and Al3+ on RE3+ adsorption and desorption in binding sites of montmorillonite (MMT) were investigated. Through the pre-saturation, the interlayer ions of MMT had been replaced by K+, Ca2+ or Al3+. RE3+ can adsorb on the interlayer sites of Ca-MMT and K-MMT, but nearly not Al-MMT. The basal spacing of Ca-MMT is larger than K-MMT, which provides a smaller hinder effect of interlayer collapse for the interlayer diffusion of RE3+. The adsorption capacity followed the order: Ca-MMT＞K-MMT＞Al-MMT and La3+＞Y3+＞Eu3+. It can predict that the grade of the exchangeable RE in ores abundant in Ca2+ is the most, followed by the ore rich in K+ and Al3+ the least. Clay minerals tend to adsorb light RE and hard to adsorb middle and heavy RE. The reversibility of RE adsorbed in interlayers, especially in collapsed interlayers, is far worse than that on externals. The desorption rates of RE were in the order of RE-Al-MMT＞RE-K-MMT＞RE-Ca-MMT and Eu3+＞Y3+＞La3+. For the desorption of interlayer RE3+, NH4+ is better than Mg2+ because the larger change of the basal spacings (Δd) provides more minor activation energy barriers (ΔE) for NH4+ diffusion within interlayers. It can enrich the metallogeny theory of weathered crust elution-deposited rare earth ores and provide a certain theoretical basis for its efficient exploitation.
Źródło:: Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168280
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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