Modified clays alter diversity and respiration profile of microorganisms in long‐term hydrocarbon and metal co‐contaminated soil

Biswas, Bhabananda; Juhasz, Albert L.; Rahman, Mohammad Mahmudur; Naidu, Ravi

doi:10.1111/1751-7915.13510

Cited by 12 publications

(3 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1,2 It is also an important catalyst for petroleum cracking and refining. 3,4 The application of clay in remediating environmental pollution 5,6 and dealing with nuclear waste [7][8][9] has also achieved great progress. In addition, research on clays and the origin of life has also aroused great interest.…”

Section: Introductionmentioning

confidence: 99%

X‐ray spectral characteristics of typical clays in China and their application in clay classification

et al. 2023

View full text Add to dashboard Cite

The variety and content of minerals in clay determine its quality and use. The x‐ray fluorescence characteristics of seven elements, that is, Mg, Al, Si, K, Ca, Ti, and Fe, in clay samples were studied using the energy‐dispersive x‐ray fluorescence (EDXRF) method. The application of wavelet transform was used to analyze the overlapping peaks of the FeKα and MnKβ and the CaKα and KKβ spectral lines and to measure the spectral peak count rate and the content of seven elements. The weight of classified elements in clay was calculated through principal component analysis, and the clay samples from four clay‐producing areas were classified using the K‐means clustering method. The results showed that the accuracy of classification using the count rate of seven elements reached 97.73%. The average accuracy of the classification results of the content of seven elements reached 80.68%. A comparison of the results showed that the EDXRF spectral peak information provides a reliable scientific method for the identification and tracing of clay and its products. In addition, tracing the origin of clay and its products can also indirectly assess the radiation level and its impact on the radiation environment based on the radiation index test results.

show abstract

Section: Introductionmentioning

confidence: 99%

X‐ray spectral characteristics of typical clays in China and their application in clay classification

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The presence of these cations can result in a wide range of chemical compositions for clay minerals through substitutions of aluminum for magnesium and iron [2]. Clays are classified into different groups based on their structural arrangements and chemical compositions, and these properties determine their applications [2,3]. Two examples of clay groups are smectite and kaolinite.…”

Section: Introductionmentioning

confidence: 99%

“…Smectites, including minerals like montmorillonite, saponite, hectorite, nantronite, and beidellite, belong to the hydroxy alumino-silicate group and are formed through the weathering of soil, rock, or volcanic ash [3,4]. Chemical substitution, exchangeable cations, and impurities can influence the physical and chemical properties of smectites [5].…”

Section: Introductionmentioning

confidence: 99%

Characterization of South African Bentonite and Kaolin Clays

Kgabi,

Ambushe

2023

Sustainability

View full text Add to dashboard Cite

The present study aimed to investigate the mineralogical and morphological properties of two South African clays, namely bentonite and kaolin. These clays are mined in specific regions of the country but have not been fully characterized in terms of their properties for potential application in a number of industries. Bentonite was found to have a larger specific surface area, pore size, and more interchangeable cations than kaolin. The bentonite was also identified as Na-bentonite due to the huge Na content present in the clay. The powder X-ray diffraction (PXRD) patterns revealed that both clays are crystalline, together with the Fourier-transform infrared (FTIR) spectrophotometer results; presumably, some impurities of quartz could be present in the clay materials. The most prevalent functional groups present include Al-OH, Si-O-Mg, Si-O, and Si-O-Al groups. The surface charge of bentonite was consistently negative across all pH values, indicating its potential for adsorption applications. On the other hand, kaolin exhibited a negative charge at pH values greater than 2.4. The scanning electron microscopy (SEM) images provided visual evidence of the presence of pores in the clay structures, which supported the Brunauer–Emmett–Teller (BET) results classifying both bentonite and kaolin as mesoporous and macroporous materials. The particle size analysis revealed a broad distribution for bentonite and a bimodal distribution for kaolin. Overall, the clays revealed interesting features that can be useful for application in several industries, for example, in the treatment of wastewater. Further research and development can explore their potential to address environmental challenges, particularly the application of bentonite and kaolin in water treatment processes to remove toxic metal ions.

show abstract

Importance of substrate quality and clay content on microbial extracellular polymeric substances production and aggregate stability in soils

et al. 2022

View full text Add to dashboard Cite

We investigated the effects of substrate (cellulose or starch) and different clay contents on the production of microbial extracellular polymeric substances (EPS) and concomitant development of stable soil aggregates. Soils were incubated with different amounts of montmorillonite (+ 0.1%, + 1%, + 10%) both with and without two substrates of contrasting quality (starch and cellulose). Microbial respiration (CO2), biomass carbon (C), EPS-protein, and EPS-polysaccharide were determined over the experimental period. The diversity and compositional shifts of microbial communities (bacteria/archaea) were analysed by sequencing 16S rRNA gene fragments amplified from soil DNA. Soil aggregate size distribution was determined and geometric mean diameter calculated for aggregate formation. Aggregate stabilities were compared among 1–2-mm size fraction. Starch amendment supported a faster increase than cellulose in both respiration and microbial biomass. Microbial community structure and composition differed depending on the C substrate added. However, clay addition had a more pronounced effect on alpha diversity compared to the addition of starch or cellulose. Substrate addition resulted in an increased EPS concentration only if combined with clay addition. At high clay addition, starch resulted in higher EPS concentrations than cellulose. Where additional substrate was not provided, EPS-protein was only weakly correlated with aggregate formation and stability. The relationship became stronger with addition of substrate. Labile organic C thus clearly plays a role in aggregate formation, but increasing clay content was found to enhance aggregate stability and additionally resulted in the development of distinct microbial communities and increased EPS production.

show abstract

Modified clays alter diversity and respiration profile of microorganisms in long‐term hydrocarbon and metal co‐contaminated soil

Cited by 12 publications

References 59 publications

X‐ray spectral characteristics of typical clays in China and their application in clay classification

X‐ray spectral characteristics of typical clays in China and their application in clay classification

Characterization of South African Bentonite and Kaolin Clays

Importance of substrate quality and clay content on microbial extracellular polymeric substances production and aggregate stability in soils

Contact Info

Product

Resources

About