Development and characterization of clay-based composites for innovative and environmentally friendly applications
Eiropas Zaļais kurss uzsver nozīmīgumu palielināt drošu un ilgtspējīgu materiālu izmantošanu, kas nekaitē cilvēkiem un videi. Promocijas darbs piedāvā risinājumu, kas sintētiskās un toksiskās vielas vides tehnoloģijās ļauj aizstāt ar dabiskiem, plaši pieejamiem un lētiem materiāliem – māla minerāliem. Pētījuma mērķis ir izstrādāt un raksturot ar organiskām un neorganiskām vielām modificētus māla minerālus un eksperimentāli pārbaudīt sintezēto kompozītmateriālu pielietojumu videi draudzīgās tehnoloģijās. Rezultāti atklāj, ka modifikācijas metodes sniedz iespēju mērķtiecīgi mainīt mālu īpašības, tādējādi nodrošinot jaunus pielietojumus - indikatorus pārtikas kvalitātes kontrolei; sorbentus ci…
Clay-Humic Substance Composites for Removal of Pharmaceuticals from Water
Humic substances are the main component of soil organic matter and they actively interact with substances in soils, including pollutants. Humic acid-clay mineral composite materials can be considered as prospective and low-cost sorbents for contaminant removal. The aim of this study is to develop clay mineral and humic acid composite materials and to characterise their possible applications. For this research, montmorillonite, kaolinite and bentonite were saturated with three types of humic substances: technical humic acid from lignite, humic substances extracted from raised bog peat (Latvia) and technical K humate from lignite. Obtained sorbents were characterized using FTIR. The sorption …
Bentonite-ionic liquid composites for Congo red removal from aqueous solutions
Abstract Clay-organic composites have attracted great interest due to their ability to remove various contaminants from wastewater. The surfactants are the most commonly used organic compounds for clay modification. However, cationic surfactants are toxic and can be environmentally hazardous. Ionic liquids are a new promising alternative to the cationic surfactants due to lesser toxicity and appropriate thermal stability. The research aim is to prepare an environmentally friendly new class of clay sorbents modified with ionic liquids for potential applications in wastewater treatment from the textile industry. Imidazolium-based ionic liquids with different lengths of alkyl chains were inter…
Microbiological Stability of Bio-Based Building Materials
The aim of this paper was to study the microbiological stability of bio-based composite building materials, which are made using organic-rich lake sediments (further – sapropel) with lime and magnesium cement as binders and hemp shives as filler. The microbial stability properties of the obtained composite materials were investigated and compared to similar composites. Because of their high organic content, these materials are prone to biodegradation; therefore, they were coated with ALINA LIFE TM organoclay coating, which helps to extend the product life, reducing the rate of biodegradation compared to the biocides used in industry. The effect of the coating on the resistance to decay by t…