keyword
https://read.qxmd.com/read/38533018/anionic-dye-removal-by-immobilized-bacteria-into-alginate-polyvinyl-alcohol-bentonite-matrix
#1
JOURNAL ARTICLE
Adi Setyo Purnomo, Frida Wahyu Hairunnisa, Misdar, Virda Putri Maria, Alya Awinatul Rohmah, Surya Rosa Putra, Herdayanto Sulistyo Putro, Hamdan Dwi Rizqi
Methyl orange (MO) is commonly used in the textile dyeing industry, posing serious health and environmental hazards due to its carcinogenic, mutagenic properties, and potential for bioaccumulation. Appropriate handling is needed to solve these problems by harnessing the capacity of living microorganisms and the adsorption properties of bentonite clay minerals. Although the conventional approach predominantly depends on free cells, recent study has developed other methods such as immobilization techniques. Therefore, this study aimed to investigate the efficiency of the immobilization matrix comprising sodium alginate (SA), polyvinyl alcohol (PVA), and bentonite by modifying Pseudomonas aeruginosa , Bacillus subtilis , and Ralstonia pickettii for MO removal of 50 mg/L...
March 30, 2024: Heliyon
https://read.qxmd.com/read/38492679/functional-upcycling-of-waste-pet-plastic-to-the-hybrid-magnetic-microparticles-adsorbent-for-cesium-removal
#2
JOURNAL ARTICLE
Kayee Chan, Anatoly Zinchenko
Accumulation of mismanaged plastic in the environment and the appearance of emerging plastic-derived pollutants such as microplastics strongly demand technologies for waste plastic utilization. In this study, polyethylene terephthalate (PET) from waste plastic bottles was directly utilized to prepare a matrix of an adsorbent for cesium (Cs+ ) removal. The organic matrix of PET-derived oligomers obtained from aminolysis was impregnated with bentonite clay and magnetite nanoparticles (Fe3 O4 NPs), playing the roles as a major adsorptive medium for Cs+ removal and as a functional component to primarily provide efficient separation of the hybrid adsorbent from aqueous system, respectively...
March 14, 2024: Chemosphere
https://read.qxmd.com/read/38485735/gas-entry-pressure-impact-on-the-evaluation-of-hydrogen-migration-at-different-scales-of-a-deep-geological-disposal-of-radioactive-waste
#3
JOURNAL ARTICLE
Zakaria Saâdi
Although the importance of gas-entry pressure in simulating two-phase liquid-gas flow in porous media has been studied at the column and borehole scales, its impact on the simulation of transient hydraulic-gas at different scales of a deep geological repository of radioactive waste (DGR) in low permeability clay rock during the post-closure phase has not yet been studied. The purpose of this work is to show that neglecting this phenomenon can lead to underestimation of the maximum gas pressure and water-gas fluxes simulated within the host rock and backfilled drift network...
March 14, 2024: Scientific Reports
https://read.qxmd.com/read/38458234/impact-of-dry-density-and-incomplete-saturation-on-microbial-growth-in-bentonite-clay-for-nuclear-waste-storage
#4
JOURNAL ARTICLE
Rachel C Beaver, Melody A Vachon, Claire S Tully, Katja Engel, Emilie Spasov, W Jeffrey Binns, James J Noël, Josh D Neufeld
AIMS: Many countries are in the process of designing a deep geological repository (DGR) for long-term storage of used nuclear fuel. For several designs, used fuel containers will be placed belowground with emplacement tunnels being backfilled using a combination of highly compacted powdered bentonite clay buffer boxes surrounded by a granulated "gapfill" bentonite. To limit the potential for microbiologically influenced corrosion of used fuel containers, identifying conditions that suppress microbial growth is critical for sustainable DGR design...
March 8, 2024: Journal of Applied Microbiology
https://read.qxmd.com/read/38457944/potential-retention-of-dissolved-organic-matter-by-soil-minerals-during-wetland-water-table-fluctuations
#5
JOURNAL ARTICLE
Simin Wang, Ting Liu, Erxiong Zhu, Chen He, Quan Shi, Xiaojuan Feng
Wetlands export large amounts of dissolved organic carbon (DOC) downstream, which is sensitive to water-table fluctuations (WTFs). While numerous studies have shown that WTFs may decrease wetland DOC via enhancing DOC biodegradation, an alternative pathway, i.e., retention of dissolved organic matter (DOM) by soil minerals, remains under-investigated. Here, we conducted a water-table manipulation experiment on intact soil columns collected from three wetlands with varying contents of reactive metals and clay to examine the potential retention of DOM by soil minerals during WTFs...
March 3, 2024: Water Research
https://read.qxmd.com/read/38434831/erratum-antibacterial-efficacy-of-zno-bentonite-clay-nanocomposites-against-multidrug-resistant-escherichia-coli
#6
Susanta Kumar Behera, Gausal A Khan, Swati Sucharita Singh, Bhumika Jena, Kali Sashank, Srinivas Patnaik, Ramesh Kumar, Byong-Hun Jeon, Sankha Chakrabortty, Suraj K Tripathy, Amrita Mishra
[This corrects the article DOI: 10.1021/acsomega.3c07950.].
February 27, 2024: ACS Omega
https://read.qxmd.com/read/38434826/comparison-of-dye-adsorption-of-chitosan-and-polyethylenimine-modified-bentonite-clays-optimization-isotherm-and-kinetic-studies
#7
JOURNAL ARTICLE
Nilay Kahya, Begüm Şen, Demet Berber, Nevin Öztekin
The aim of this study was to compare the effect of modifying calcium bentonite (Bent-Ca) clay with two cationic polymers, chitosan (Chi) and polyethylenimine (PEI), on the removal of remazol black B (RB-B) dye from an aqueous solution. The samples were characterized by using scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The fractional factorial design of 2(6-1) was applied to investigate the effects of pH, temperature, amount of adsorbent, initial dye concentration, contact time, and shaking rate on the adsorption process...
February 27, 2024: ACS Omega
https://read.qxmd.com/read/38402975/membrane-behavior-of-clay-under-mixed-solution-conditions
#8
JOURNAL ARTICLE
Zhihong Zhang, Haowen Yang, Zhaoyang Song
Compacted clay is employed as the buffer material for landfills, and multiple ions are dissolved in the leachate restricted by the compacted clay layer. The membrane efficiency is an important indicator to assess the barrier properties of the compacted clay layer and is measured through membrane tests. However, most membrane tests are currently conducted with a single solute solution, which does not reflect the mixed solution characteristics of leachates. To assess the membrane efficiency of compacted clay under mixed solution conditions, 13 membrane tests were conducted on a bentonite-amended soil using KCl-NaCl mixed solutions, KCl-CaCl2 mixed solutions, and KCl-AlCl3 mixed solutions with different mixing ratios at a total concentration of 20 mM...
February 23, 2024: Science of the Total Environment
https://read.qxmd.com/read/38401220/the-effect-of-tween-80-on-monochlorobenzene-migration-in-bentonite
#9
JOURNAL ARTICLE
Changxiang Wang, Changzhong Xu, Danqing Liu, Zhe Yang, Sen Yang, Zhi Feng, Jiali Xu, Yilian Li
Several studies conducted at industrial sites have documented the infiltration of dense non-aqueous phase liquids (DNAPLs) into clay layers, a phenomenon potentially influenced by the coexistence of chemicals like surfactants in some common pollutants. Bentonite (Ben), monochlorobenzene (MCB), and Tween 80 (T80) were selected as reference components to investigate the influences of nonionic surfactants on DNAPLs migration in clays. Results showed that T80 promotes MCB dissolution and encourages MCB adsorption on Ben...
February 13, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38398995/passively-q-switched-er-doped-fiber-laser-based-on-bentonite-clay-al-2-h-2-o-6-si-saturable-absorber
#10
JOURNAL ARTICLE
Haroon Asghar, Umer Sayyab Khalid, Muhammad Sohail, Tahani A Alrebdi, Zeshan A Umar, A M Alshehri, Rizwan Ahmed, M Aslam Baig
This paper presents the investigations toward the direct use of bentonite clay (Al2 H2 O6 Si) nanoparticles to act like a saturable absorber (SA) for the Q-switched pulse operation of an erbium-doped fiber laser (EDFL). The measured results reveal that with the incorporation of bentonite clay nanopowder as a SA, an EDFL is realized with a Q-switching mechanism starting at a pump power of 30.8 mW, and a Q-switched emission wavelength was noticed at 1562.94 nm at 142 mW pump power. With an increased pump from 30...
February 13, 2024: Micromachines
https://read.qxmd.com/read/38391426/preparation-and-performance-evaluation-of-ionic-liquid-copolymer-shale-inhibitor-for-drilling-fluid-gel-system
#11
JOURNAL ARTICLE
Zhiwen Dai, Jinsheng Sun, Zhuoyang Xiu, Xianbin Huang, Kaihe Lv, Jingping Liu, Yuanwei Sun, Xiaodong Dong
An inhibitor that can effectively inhibit shale hydration is necessary for the safe and efficient development of shale gas. In this study, a novel ionic liquid copolymer shale inhibitor (PIL) was prepared by polymerizing the ionic liquid monomers 1-vinyl-3-aminopropylimidazolium bromide, acrylamide, and methacryloyloxyethyl trimethyl ammonium chloride. The chemical structure was characterized using fourier transform infrared spectroscopy (FT-IR) and hydrogen-nuclear magnetic resonance (H-NMR), and the inhibition performance was evaluated using the inhibition of slurrying test, bentonite flocculation test, linear expansion test, and rolling recovery test...
January 26, 2024: Gels
https://read.qxmd.com/read/38378814/bentonite-as-eco-friendly-natural-mineral-support-for-pd-cofe-2-o-4-catalyst-applied-in-toluene-diamine-synthesis
#12
JOURNAL ARTICLE
Alpár F Hatvani-Nagy, Viktória Hajdu, Ágnes Mária Ilosvai, Gábor Muránszky, Emőke Sikora, Ferenc Kristály, Lajos Daróczi, Béla Viskolcz, Béla Fiser, László Vanyorek
Toluene diamine (TDA) is a major raw material in the polyurethane industry and thus, its production is highly important. TDA is obtained through the catalytic hydrogenation of 2,4-dinitrotoluene (2,4-DNT). In this study a special hydrogenation catalyst has been developed by decomposition cobalt ferrite nanoparticles onto a natural clay-oxide nanocomposite (bentonite) surface using a microwave-assisted solvothermal method. The catalyst particles were examined by TEM and X-ray diffraction. The palladium immobilized on the bentonite crystal surface was identified using an XRD and HRTEM device...
February 20, 2024: Scientific Reports
https://read.qxmd.com/read/38365155/lawsonia-inermis-organically-modified-chitosan-intercalated-bentonite-clay-a-multifunctional-nanotheranostic-system-for-controlled-drug-delivery-sensing-and-cellular-imaging
#13
JOURNAL ARTICLE
P Sirajunnisa, S Sreelakshmi, G S Sailaja
This study presents the development of organo-bentonites (OBs); a cost-effective drug delivery system holding both sensing and imaging capabilities. The OBs were synthesized using quaternary ammonium cations derived from chitosan, Lawsonia inermis, and pyrene/anthracene carboxaldehyde combinations through a three-step process: Mannich reaction, quaternization, and intercalation. Physicochemical characterization confirms the organic modification of bentonite. The OBs: NQPB and NQAB hold substantial ciprofloxacin (Cipro) loading capacities (71...
February 14, 2024: International Journal of Biological Macromolecules
https://read.qxmd.com/read/38336238/pica-behavior-of-laboratory-rats-rattus-norvegicus-domestica-nauseated-animals-ingest-kaolin-zeolite-bentonite-but-not-calcium-carbonate-chalk
#14
JOURNAL ARTICLE
Sadahiko Nakajima
"Pica" refers to the ingestion of non-nutritive substances by animals that would not typically consume them. The pica behavior can be utilized to investigate the internal conditions of animals' bodies. For example, rats, due to neuroanatomical reasons, cannot vomit; nevertheless, when nauseated, they ingest kaolin clay. This renders the ingestion of kaolin a practical proxy for measuring nausea in rats. The question of whether rats consume minerals other than kaolin during nauseous episodes remains unanswered...
February 7, 2024: Behavioural Processes
https://read.qxmd.com/read/38325142/recent-advances-in-natural-nanoclay-for-diagnosis-and-therapy-of-cancer-a-review
#15
REVIEW
Mohamed J Saadh, Waleed K Abdulsahib, Anfal Nabeel Mustafa, Rahman S Zabibah, Zainab Hussein Adhab, Nodir Rakhimov, Fahad Alsaikhan
Cancer is still one of the deadliest diseases, and diagnosing and treating it effectively remains difficult. As a result, advancements in earlier detection and better therapies are urgently needed. Conventional chemotherapy induces chemoresistance, has non-specific toxicity, and has a meager efficacy. Natural materials like nanosized clay mineral formations of various shapes (platy, tubular, spherical, and fibrous) with tunable physicochemical, morphological, and structural features serve as potential templates for these...
January 26, 2024: Colloids and Surfaces. B, Biointerfaces
https://read.qxmd.com/read/38321086/proportional-impact-prediction-model-of-coating-material-on-nitrate-leaching-of-slow-release-urea-super-granules-usg-using-machine-learning-and-rsm-technique
#16
JOURNAL ARTICLE
Sidhartha Sekhar Swain, Tapan Kumar Khura, Pramod Kumar Sahoo, Kapil Atmaram Chobhe, Nadhir Al-Ansari, Hari Lal Kushwaha, Nand Lal Kushwaha, Kanhu Charan Panda, Satish Devram Lande, Chandu Singh
An accurate assessment of nitrate leaching is important for efficient fertiliser utilisation and groundwater pollution reduction. However, past studies could not efficiently model nitrate leaching due to utilisation of conventional algorithms. To address the issue, the current research employed advanced machine learning algorithms, viz., Support Vector Machine, Artificial Neural Network, Random Forest, M5 Tree (M5P), Reduced Error Pruning Tree (REPTree) and Response Surface Methodology (RSM) to predict and optimize nitrate leaching...
February 6, 2024: Scientific Reports
https://read.qxmd.com/read/38318622/clay-based-heterogeneous-catalysts-for-carbon-nitrogen-bond-formation-a-review
#17
REVIEW
P Vinoth Kumar, G Madhumitha
Clay and modified clay-based catalysts are widely used in organic transformation. Owing to the interlayer ions and good ion exchange capacity of clay, replacement with another ion and incorporation of different nanomaterials can be done. Due to these significant properties of clay, it can be utilized in the synthesis of various organic compounds. Carbon-nitrogen bonded compounds possess diverse applications in different fields. These compounds are prepared using different solid acid heterogeneous catalysts...
January 31, 2024: RSC Advances
https://read.qxmd.com/read/38295723/enhanced-fertilizer-utilization-and-heavy-metals-immobilization-by-ball-milling-bentonite-with-nh-4-cl-experiments-and-dft-calculations
#18
JOURNAL ARTICLE
Meng Ren, Pengjie Zhao, Xuedan Cui, Chen Wang, Yinjie Zhang, Lin Guo, Aijun Lin, Lei Zheng, Congbin Xu
Over-application of nitrogen fertilizer induces soil acidification, which activates heavy metals availability and poses significant challenge to crop production and food safety. In this study, we prepared a clay-based material by ball-milling bentonite with NH4 Cl (NH4 Cl@bentonite) and assessed its synergistic performance in enhancing nitrogen fertilizer utilization efficiency, immobilizing heavy metals, and improving crop yield and safety. The results showed that the optimal performance of NH4 Cl@bentonite was achieved by milling bentonite with NH4 Cl at a 4:1 mass ratio for 9 h...
January 24, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38291042/temperature-humidity-evolution-and-radon-exhalation-mechanism-of-red-clay-bentonite-covering-layer-in-uranium-mill-tailings-pond
#19
JOURNAL ARTICLE
Chao Xie, Wenjun Lu, Hong Wang, Xiangshuai Wang, Tao Yu
To ensure the safety and stability of the beach surface of the decommissioned uranium mill tailings pond, this paper uses red clay-bentonite and red clay (1:1) to carry out covering layer radon reduction simulation experiments to study the temperature, humidity, and radon reduction effect of the covering layer under natural conditions. The results show that the radon exhalation rate of red clay-bentonite cover layer is only 0.32 times that of red clay, which has a better radon reduction effect. The red clay-bentonite cover layer has better water retention and comparable heat preservation effect than red clay cover layer...
January 30, 2024: Scientific Reports
https://read.qxmd.com/read/38271875/fate-and-cotransport-of-pb-ii-and-cd-ii-heavy-ions-with-bentonite-colloidal-flow-in-saturated-porous-media-the-role-of-filter-cake-counter-ions-colloid-concentration-and-fluid-velocity
#20
JOURNAL ARTICLE
Hamed Movahedi, Kaveh Shaygan, Nicolas Bovet, Adrian Alexander Schiefler, Saeid Jamshidi
This study examines the transport and retention of colloidal particles and heavy ions in porous sand, focusing on the environmental risks associated with waste from oil and gas drilling. Experimental and numerical models assess the influence of flow rate, external filter cake layer, and ionic strength on bentonite clay particles and heavy ions, such as cadmium (Cd) and lead (Pb), in near-wellbore (high-flux) and far-field (low-flux) scenarios. Colloidal filtration theory and the one-dimensional convection-dispersion equation with two-site kinetic model for attachment and detachment were utilized to calibrate and predict the transport of colloidal suspension in porous media...
January 20, 2024: Journal of Hazardous Materials
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