The specific adsorption of radiolabeled sulfate ions from perchlorate supporting electrolyte on hematite powder has been investigated. It was demonstrated that a measurable adsorption occurs only at pH values under 5. The adsorption capacity of a given amount of hematite powder tends to a limiting value with decreasing pH. A Langmuir-like adsorption isotherm describes the concentration dependence of the adsorption of sulfate species. It was found that the experimental results are in good agreement with the model suggested recently (Hug, S. J. J. Colloid Interface Sci. 188, 415 (1997)). Copyright 2000 Academic Press.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1006/jcis.2000.6852 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Integration of ratiometric, ultrafast, sensitive detection as well as rapid and efficient removal of tetracycline based on a novel Zn (II) functionalized magnetic covalent organic framework.
Anal Chim Acta
March 2025
State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, PR China. Electronic address:
Background: Based on the low volatility and refractory nature of Tetracycline (TC), excessive use leads to its continuous accumulation in water environments, posing serious risks to the ecological environment and human health. Although a very limited number of nanomaterials capable of simultaneously detecting and removing TC have been fabricated, they generally exist issues associated with a single detection signal ("on" or "off") or low adsorption rates with low adsorption capacities. As a result, it is crucial to develop a reliable technique to achieve ratiometric detection as well as rapid and efficient removal of TC.
View Article and Find Full Text PDFCofactor-directed co-immobilization of dual-enzyme on functionalized montmorillonite with enhanced catalytic performance.
Int J Biol Macromol
January 2025
School of Environment and Resource, Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China.
Recently, multi-enzyme cascade catalysis has attracted increasing attention due to the advantages of integrating multiple enzymes, few side reactions and high catalytic efficiency. Herein, a novel dual-enzyme cascade system (GOx-FMt-HRP) was developed through cofactor-directed orientational co-immobilization of glucose oxidase (GOx) and horseradish peroxidase (HRP) onto functional montmorillonite (FMt). The presented method realizes the reconstitution of cofactors and apo-enzymes (enzymes without cofactors), which enables enzymes to be immobilized in specific orientations on the support, thereby effectively reducing changes in their conformation.
View Article and Find Full Text PDFPreparation of the immobilized α-adrenoceptor column by the ultra-high affinity protein pair CL7/Im7 and its application in drug-protein interaction analysis.
J Chromatogr B Analyt Technol Biomed Life Sci
January 2025
Northwest University Chang An Hospital, Faculty of Life Sciences and Medicine, Northwest University, Xi'an, Shaanxi 710069, China; Department of Clinical Pharmaceutics, Chang An District Hospital, Xi'an, Shaanxi 710118, China. Electronic address:
Immobilizing the target protein on a solid surface with controlled orientation, high specificity, and maintained activity is a proven strategy to enhance the stability of the protein. In this study, we employed an ultra-high affinity protein pair consisting of a mutant of colicin E7 Dnase and its corresponding inhibitor, immunity protein 7(Im7), to develop an immobilized α-adrenoceptor (α-AR) column. Briefly, we expressed α-AR fused with CL7 as a tag at its C-terminus in Escherichia coli cells.
View Article and Find Full Text PDFUnraveling Ofloxacin Behavior in Aqueous Environments: Molecular Dynamics of Colloidal Formation and Surface Adsorption Mechanisms.
Langmuir
January 2025
School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
Ofloxacin, a commonly prescribed antibiotic, raises serious environmental concerns due to its persistence in aquatic systems. This study offers new insights into the environmental behavior of ofloxacin and its interactions with carbon-based adsorbents with the aim of enhancing our understanding of its removal mechanisms via adsorption processes. Using a comprehensive computational approach, we analyzed the speciation, pK values, and solubility of ofloxacin across various pH conditions, accounting for all four microspecies, including the often-overlooked neutral form.
View Article and Find Full Text PDFMolecular and Electronic Structures at Electrochemical Interfaces from Resonant X-Ray Diffraction.
J Am Chem Soc
January 2025
Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, Grenoble INP, LEPMI 38000 Grenoble, France.
An original approach to characterize electrochemical interfaces at the atomic level, a challenging topic toward the understanding of electrochemical reactivity, is reported. We employed surface resonant X-ray diffraction experiments combined with their simulation using first-principle density functional theory calculations and were thus able to determine the molecular and electronic structures of the partially ionic layer facing the electrode surface, as well as the charge distribution in the surface metal layers. Pt(111) in an acidic medium at an applied potential excluding specific adsorption was studied.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!