keyword
https://read.qxmd.com/read/38535651/energy-storage-performance-of-electrode-materials-derived-from-manganese-metal-organic-frameworks
#1
JOURNAL ARTICLE
Gyeongbeom Ryoo, Seon Kyung Kim, Do Kyung Lee, Young-Jin Kim, Yoon Soo Han, Kyung-Hye Jung
Metal-organic frameworks (MOFs) are porous materials assembled using metal and organic linkers, showing a high specific surface area and a tunable pore size. Large portions of metal open sites in MOFs can be exposed to electrolyte ions, meaning they have high potential to be used as electrode materials in energy storage devices such as supercapacitors. Also, they can be easily converted into porous metal oxides by heat treatment. In this study, we obtained high energy storage performance by preparing electrode materials through applying heat treatment to manganese MOFs (Mn-MOFs) under air...
March 11, 2024: Nanomaterials
https://read.qxmd.com/read/38529512/the-technology-of-polychrome-glazed-ceramics-in-ifriqiya-new-data-from-the-site-of-chimtou
#2
JOURNAL ARTICLE
V Occari, H Möller, C Fenwick, P Quinn, I C Freestone, M Chaouali, P von Rummel
UNLABELLED: Ifriqiya (roughly Tunisia and eastern Algeria) is believed to have played a significant role in the diffusion of ceramic glazed technologies into other regions of the Western Mediterranean. However, due to limited analysis on North African glazed ceramics, its role in technology transfer remains poorly understood. This paper uses SEM-EDS and petrographic analyses to understand the technology employed in the production of Tunisian ceramics through the study of 30 polychrome glazed ceramics from a medieval settlement at the site of Chimtou (ancient Simitthus), Tunisia, dated to the late ninth-twelfth century...
2024: Archaeological and Anthropological Sciences
https://read.qxmd.com/read/38527895/catalytic-oxidation-of-toluene-by-manganese-oxides-effect-of-k-doping-on-oxygen-vacancy
#3
JOURNAL ARTICLE
Zhenzhen Huang, Haiyang Li, Xuejun Zhang, Yanli Mao, Yinghan Wu, Wei Liu, Hongrun Gao, Mengru Zhang, Zhongxian Song
Alkali metal potassium was beneficial to the electronic regulation and structural stability of transition metal oxides. Herein, K ions were introduced into manganese oxides by different methods to improve the degradation efficiency of toluene. The results of activity experiments indicated that KMnO4 -HT (HT: Hydrothermal method) exhibited outstanding low-temperature catalytic activity, and 90% conversion of toluene can be achieved at 243°C, which was 41°C and 43°C lower than that of KNO3 -HT and Mn-HT, respectively...
August 2024: Journal of Environmental Sciences (China)
https://read.qxmd.com/read/38527888/iodine-enrichment-in-the-groundwater-in-south-china-and-its-hydrogeochemical-control
#4
JOURNAL ARTICLE
Fengping Zhou, Qianting Xu, Yuyun Chen, Weihua Zhang, Rongliang Qiu
In North China, iodine-rich groundwater has been extensively studied, but few in South China. This study aimed to investigate the characteristics of iodine-rich groundwater in South China and identify potential contamination sources. The results revealed that the average concentration of iodine in groundwater was 890 µg/L, with a maximum concentration of 6350 µg/L, exceeding the permitted levels recommended by the World Health Organization (5-300 µg/L). Notably, the enrichment of iodide occurred in acidic conditions (pH = 6...
August 2024: Journal of Environmental Sciences (China)
https://read.qxmd.com/read/38522271/selenium-increases-antimony-uptake-in-ramie-boehmeria-nivea-l-by-enhancing-the-physiological-antioxidative-and-ionomic-mechanisms
#5
JOURNAL ARTICLE
Yi Lu, Fangyuan Peng, Yingyang Wang, Zhaoguang Yang, Haipu Li
Ramie (Boehmeria nivea L.) is a promising phytoremediation candidate due to its high tolerance and enrichment capacity for antimony (Sb). However, challenges arise as Sb accumulated mainly in roots, complicating soil extraction. Under severe Sb contamination, the growth of ramie may be inhibited. Strategies are needed to enhance Sb accumulation in ramie's aboveground parts and improve tolerance to Sb stress. Considering the beneficial effects of selenium (Se) on plant growth and enhancing resistance to abiotic stresses, this study aimed to investigate the potential use of Se in enhancing Sb uptake by ramie...
March 23, 2024: Journal of Environmental Management
https://read.qxmd.com/read/38521357/heavy-metal-pollution-near-an-abandoned-mercury-bearing-waste-recovery-enterprise-in-southwestern-china-spatial-distribution-and-its-sources-in-soil-and-plants
#6
JOURNAL ARTICLE
Jianbo Guo, Liyuan Liu, Qinzhong Feng, Camillus Uchenna Okonkwo, Xiujin Zhang, Jun Chen, Shitong Yang, Chen Yang
The contribution of smelting of nonferrous metals to heavy metals in surface soil have become increasingly important over the past decade. In this study, the distribution of heavy metals around an abandoned mercury-bearing waste recovery enterprise were investigated. Soil (14) and plant (18) samples were collected in the surrounding area. The total concentration of heavy metals and methyl mercury content were measured by ICP-MS and HPLC-ICP-MS. The results show that the average contents of Cd, Cr, Pb, Hg and As in all soil samples are higher than the second-level values of Soil environmental quality-Risk control standard for soil contamination of development land (GB 36600-2018)...
March 21, 2024: Environmental Research
https://read.qxmd.com/read/38521035/can-xenobiotics-support-the-growth-of-mn-ii-oxidizing-bacteria-mnob-a-case-of-phenol-utilizing-bacteria-pseudomonas-sp-an-1
#7
JOURNAL ARTICLE
Aonan Qiao, Haixia Pan, Jiaxi Zang, Yiwen Zhang, Xianliang Yi, Yang Liu, Jingjing Zhan, Xiaojing Yang, Xu Zhao, Ang Li, Hao Zhou
Biogenic manganese oxides (BioMnOx ) produced by Mn(II)-oxidizing bacteria (MnOB) have garnered considerable attention for their exceptional adsorption and oxidation capabilities. However, previous studies have predominantly focused on the role of BioMnOx, neglecting substantial investigation into MnOB themselves. Meanwhile, whether the xenobiotics could support the growth of MnOB as the sole carbon source remains uncertain. In this study, we isolated a strain termed Pseudomonas sp. AN-1, capable of utilizing phenol as the sole carbon source...
March 20, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38514667/green-synthesis-and-characterization-of-%C3%AE-mn-2-o-3-nanoparticles-for-antibacterial-activity-and-efficient-visible-light-photocatalysis
#8
JOURNAL ARTICLE
Saeid Taghavi Fardood, Farzaneh Moradnia, Fateme Yekke Zare, Siamak Heidarzadeh, Mohammad Azad Majedi, Ali Ramazani, Mika Sillanpää, Ky Nguyen
In this study, green synthesis, characterizations, photocatalytic performance, and antibacterial applications of α-Mn2 O3 nanoparticles are reported. The synthesized nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), transmission electron microscope (TEM), Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), Brunauer Emmett Teller (BET), Electrochemical Impedance Spectroscopy (EIS), Photoluminescence (PL), and Differential reflectance spectroscopy (DRS) analysis...
March 21, 2024: Scientific Reports
https://read.qxmd.com/read/38512410/on-the-simulation-and-interpretation-of-substrate-water-exchange-experiments-in-photosynthetic-water-oxidation
#9
JOURNAL ARTICLE
Petko Chernev, A Orkun Aydin, Johannes Messinger
Water oxidation by photosystem II (PSII) sustains most life on Earth, but the molecular mechanism of this unique process remains controversial. The ongoing identification of the binding sites and modes of the two water-derived substrate oxygens ('substrate waters') in the various intermediates (Si states, i = 0, 1, 2, 3, 4) that the water-splitting tetra-manganese calcium penta-oxygen (Mn4 CaO5 ) cluster attains during the reaction cycle provides central information towards resolving the unique chemistry of biological water oxidation...
March 21, 2024: Photosynthesis Research
https://read.qxmd.com/read/38511412/algal-extracellular-organic-matter-induced-photochemical-oxidation-of-mn-ii-to-solid-mn-oxide-role-of-mn-iii-eom-complex-and-its-ability-to-remove-17%C3%AE-ethinylestradiol
#10
JOURNAL ARTICLE
Zhicheng Liao, Huan He, Yiying Wang, Feiyuan Liu, Danni Cui, Jingye Cui, Ziwei Guo, Chaochao Lai, Bin Huang, Hongwen Sun, Xuejun Pan
Photosensitizer-mediated abiotic oxidation of Mn(II) can yield soluble reactive Mn(III) and solid Mn oxides. In eutrophic water systems, the ubiquitous algal extracellular organic matter (EOM) is a potential photosensitizer and may have a substantial impact on the oxidation of Mn(II). Herein, we focused on investigating the photochemical oxidation process from Mn(II) to solid Mn oxide driven by EOM. The results of irradiation experiments demonstrated that the generation of Mn(III) intermediate was crucial for the successful photo oxidization of Mn(II) to solid Mn oxide mediated by EOM...
March 21, 2024: Environmental Science & Technology
https://read.qxmd.com/read/38509884/plant-mediated-biosynthesis-of-mn-3-o-4-nanostructures-and-their-biomedical-applications
#11
JOURNAL ARTICLE
Dalal N Binjawhar, Nouf M Al-Enazi, Khawla Alsamhary, Mansour Kha
Nanomaterials have drawn significant attention for their biomedical and pharmaceutical applications. In the present study, manganese tetra oxide (Mn3 O4 ) nanoparticles were prepared greenly, and their physicochemical properties were studied. Taxus baccata acetone extract was used as a safely novel precursor for reducing and stabilizing nanoparticles. The synthesized nanoparticles were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Brunauer-Emmett-Teller (BET), and Barrett-Joyner-Halenda (BJH) and X-ray diffraction (XRD)...
March 30, 2024: Heliyon
https://read.qxmd.com/read/38506665/catalyst-and-medium-control-over-rebound-pathways-in-manganese-catalyzed-methylenic-c-h-bond-oxidation
#12
JOURNAL ARTICLE
Marco Galeotti, Massimo Bietti, Miquel Costas
The C(sp3 )-H bond oxygenation of a variety of cyclopropane containing hydrocarbons with hydrogen peroxide catalyzed by manganese complexes containing aminopyridine tetradentate ligands was carried out. Oxidations were performed in 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) and 2,2,2-trifluoroethanol (TFE) using different manganese catalysts and carboxylic acid co-ligands, where steric and electronic properties were systematically modified. Functionalization selectively occurs at the most activated C-H bonds that are α- to cyclopropane, providing access to carboxylate or 2,2,2-trifluoroethanolate transfer products, with no competition, in favorable cases, from the generally dominant hydroxylation reaction...
March 20, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38503349/orced-expression-of-microrna-221-3p-exerts-protective-effects-against-manganese-induced-cytotoxicity-in-human-lung-epithelial-cells
#13
JOURNAL ARTICLE
Deepa Gandhi, Sneha Bhandari, Sehal Mishra, Ashwinkumar P Rudrashetti, Umashankar Vetrivel, Rajesh K Thimmulappa, Subbiah Rajasekaran
Manganese (Mn)-induced pulmonary toxicity and the underlying molecular mechanisms remain largely enigmatic. Further, in recent years, microRNAs (miRNAs) have emerged as regulators of several pollutants-mediated toxicity. In this context, our study aimed at elucidating whether miRNAs are involved in manganese (II) chloride (MnCl2 ) (Mn2+ )-induced cytotoxicity in lung epithelial cells. Growth inhibition of Mn2+ towards normal human bronchial epithelial (BEAS-2B) and adenocarcinomic human alveolar basal epithelial (A549) cells was analyzed by MTT assay following 24 or 48 h treatment...
March 17, 2024: Toxicology and Applied Pharmacology
https://read.qxmd.com/read/38503104/mechanisms-of-cadmium-release-from-manganese-rich-sediments-driven-by-exogenous-dom-and-the-role-of-microorganisms
#14
JOURNAL ARTICLE
Changsheng Jin, Zhongwu Li, Mei Huang, Xiang Ding, Jia Chen, Bolin Li
Dissolved organic matter (DOM) is a crucial component of natural sediments that alters Cd sequestration. Nevertheless, how different types of DOM fuel Cd mobilization in Mn-rich sediments has not been elucidated. In the present study, four typical DOM, fluvic acid (FA), bovine serum albumin (BSA), sodium alginate (SA), and sodium dodecyl benzene sulfonate (SDBS), were used to amend Cd-contaminated sediment to study their effects on Cd/Mn biotransformation and microbial community response. The results demonstrated that different DOM drive microbial community shifts and enhance microbially mediated Mn oxide (MnO) reduction and Cd release...
March 18, 2024: Ecotoxicology and Environmental Safety
https://read.qxmd.com/read/38500281/neuroinflammatory-response-and-redox-regulation-activity-of-hyperoside-in-manganese-induced-neurotoxicity-model-of-wistar-rats
#15
JOURNAL ARTICLE
Olalekan Ogunro, Oluwaseun Olasehinde
BACKGROUND: Excessive manganese exposure can lead to neurotoxicity with detrimental effects on the brain. Neuroinflammatory responses and redox regulation play pivotal roles in this process. Exploring the impact of hyperoside in a Wistar rat model offers insights into potential neuroprotective strategies against manganese-induced neurotoxicity. OBJECTIVE: The study investigated the neuroprotective efficacy of hyperoside isolated from the ethanol leaf extract of Gongronema latifolium (HELEGL), in the brain tissue of Wistar rats following 15 consecutive days of exposure to 30 mg/L of MnCl2...
March 15, 2024: Current Aging Science
https://read.qxmd.com/read/38499092/a-supramolecular-hydrogel-dressing-with-antibacterial-immunoregulation-and-pro-regeneration-ability-for-biofilm-associated-wound-healing
#16
JOURNAL ARTICLE
Yumeng Wang, Xinghong Zhao, Xingjian Zhou, Juqin Dai, Xiaowen Hu, Yinzi Piao, Guangyue Zu, Jian Xiao, Keqing Shi, Yong Liu, Yuanfeng Li, Linqi Shi
Chronic wound treatment has emerged as a significant healthcare concern worldwide due to its substantial economic burden and the limited effectiveness of current treatments. Effective management of biofilm infections, regulation of excessive oxidative stress, and promotion of tissue regeneration are crucial for addressing chronic wounds. Hydrogel stands out as a promising candidate for chronic wound treatment. However, its clinical application is hindered by the difficulty in designing and fabricating easily and conveniently...
March 16, 2024: Journal of Controlled Release
https://read.qxmd.com/read/38497490/asymmetrically-coordinated-mn-s-1-n-3-configuration-induces-localized-electric-field-driven-peroxymonosulfate-activation-for-remarkably-efficient-generation-of-1-o-2
#17
JOURNAL ARTICLE
Zhaoyi Yang, Xiaofang Yang, Weijun Zhang, Dongsheng Wang
Singlet oxygen (1 O2 ) species generated in peroxymonosulfate (PMS)-based advanced oxidation processes offer opportunities to overcome the low efficiency and secondary pollution limitations of existing AOPs, but efficient production of 1 O2 via tuning the coordination environment of metal active sites remains challenging due to insufficient understanding of their catalytic mechanisms. Herein, an asymmetrical configuration characterized by a manganese single atom coordinated is established with one S atom and three N atoms (denoted as Mn-S1 N3 ), which offer a strong local electric field to promote the cleavage of O─H and S─O bonds, serving as the crucial driver of its high 1 O2 production...
March 18, 2024: Small
https://read.qxmd.com/read/38494016/turning-harmful-mn-2-to-treasure-in-situ-formed-%C3%AE%C2%B5-mno-2-for-removing-heavy-metals-from-acid-mine-drainage
#18
JOURNAL ARTICLE
Yaozhong Wang, Yuebei Yang, Yuting Zhou, Feng Jiang, Yanjie Zheng, Wei Tan, Xiaoyun Yi, Zhi Dang
Acid mine drainage (AMD) contains high concentrations of heavy metals, causing serious environmental pollution. Current neutralization techniques fail to recover and utilize valuable heavy metals, and generate large quantities of hazardous sludge. Manganese (Mn) is generally present at high levels in AMD. Therefore, this paper proposed a technology to recover Mn from AMD, by adding KMnO4 to converting Mn into ε-MnO2 . Ultra-Violet C (UVC) was used to photolyze the residual KMnO4 . The study then evaluated the processes and mechanisms involved in the technology...
March 15, 2024: Science of the Total Environment
https://read.qxmd.com/read/38493629/mechanistic-insights-into-manganese-oxide-impacting-the-oxidation-and-transport-of-cr-iii-immobilized-by-nano-zero-valent-charged-ion-particles-in-water-saturated-porous-media
#19
JOURNAL ARTICLE
Wu Sun, Nan Xu, Wenxin Jiang, Gongbi Cheng
The presence of manganese oxide (MnO2 ) could influence the stability of green-synthesized nano-zero valent iron (nZVI@GT) associated with trivalent chromium (Cr(III)) after its excess application in the in situ remediation of hexachromium (Cr(VI)) contaminated soil. The research findings revealed that the co-transport of the remaining nZVI@GT with Cr(III) was substantially inhibited by high δ-MnO2 concentrations due to the formation of hetero-aggregates between nZVI@GT and δ-MnO2 , resulting in an increased irreversible attachment parameter at second-site in a two-site kinetic attachment model...
March 16, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38493606/speciation-and-distribution-of-arsenic-in-cold-seep-sediments-of-the-south-china-sea
#20
JOURNAL ARTICLE
Xue Wang, Jinyan Wang, Shi-Hai Mao, Zhen Zhou, Qiao Liu, Qian He, Guang-Chao Zhuang
Arsenic (As) is an abundant metalloid in marine environments, while the biogeochemical cycling of As in cold seeps remains poorly understood. We characterized the speciation of As and investigated controls of As distribution in cold seeps of South China Sea. High methane concentrations (0.2-5.5 mmol/L) and rapid sulfate depletion were observed in the seepage. Dissolved inorganic arsenic (DIAs) was enriched in the porewater ranging from 7.5 to 23.5 μg/L. As in the solid phase ranged from 2.9 to 22...
March 16, 2024: Marine Pollution Bulletin
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