keyword
https://read.qxmd.com/read/38382715/mineralogical-transformation-of-arsenic-at-different-copper-smelting-workshops-the-impact-on-arsenic-bioaccessibility
#21
JOURNAL ARTICLE
Kanghong Feng, Xiaoyun Xu, Qiang Ke, Jiaxin Ding, Ling Zhao, Hao Qiu, Xinde Cao
Soil arsenic (As) contamination associated with the demolition of smelting plants has received increasing attention. Soil As can source from different industrial processes, and also participate in soil weathering, making its speciation rather complex. This study combined the usage of chemical sequential extraction and advanced spectroscopic techniques, e.g., time of flight secondary ion mass spectrometry (ToF-SIMS), to investigate the mineralogical transformation of soil As at different processing sites from a typical copper smelting plant in China...
February 19, 2024: Chemosphere
https://read.qxmd.com/read/38382377/deep-learning-and-big-data-mining-for-metal-organic-frameworks-with-high-performance-for-simultaneous-desulfurization-and-carbon-capture
#22
JOURNAL ARTICLE
Kexin Guan, Fangyi Xu, Xiaoshan Huang, Yu Li, Shuya Guo, Yizhen Situ, You Chen, Jianming Hu, Zili Liu, Hong Liang, Xin Zhu, Yufang Wu, Zhiwei Qiao
Carbon capture and desulfurization of flue gases are crucial for the achievement of carbon neutrality and sustainable development. In this work, the "one-step" adsorption technology with high-performance metal-organic frameworks (MOFs) was proposed to simultaneously capture the SO2 and CO2 . Four machine learning algorithms were used to predict the performance indicators (NCO2+SO2 , SCO2+SO2/N2 , and TSN) of MOFs, with Multi-Layer Perceptron Regression (MLPR) showing better performance (R2  = 0.93)...
February 15, 2024: Journal of Colloid and Interface Science
https://read.qxmd.com/read/38381851/electrodeposition-of-pdpt-nanoparticles-on-edges-and-s-vacancies-in-exfoliated-mos2-nanosheets-for-enhanced-hydrogen-evolution-activity
#23
JOURNAL ARTICLE
Sakshi Gautam, Sachin Chugh, Byron D Gates
Deposition of metal nanoparticles onto the molybdenum disulfide (MoS2) nanosheets is an efficient method to tune the electronic structure of the MoS2 and maximize its catalytic performance towards the hydrogen evolution reaction (HER). Herein, we report the electrodeposition of Pd and Pt nanoparticles onto desulfurized MoS2 nanosheets (MoS2-x) to achieve an improved HER activity in an acidic electrolyte. The initial MoS2 powder was exfoliated and isolated through centrifugation, followed by electrochemical desulfurization to create defect sites...
February 21, 2024: ChemSusChem
https://read.qxmd.com/read/38379043/bibliometric-analysis-on-mercury-emissions-from-coal-fired-power-plants-a-systematic-review-and-future-prospect
#24
REVIEW
Qi Liu, Jiajia Gao, Guoliang Li, Yang Zheng, Rui Li, Tao Yue
Coal-fired power plants (CFPPs) are one of the most significant sources of mercury (Hg) emissions certified by the Minamata Convention, which has attracted much attention in recent years. In this study, we used the Web of Science and CiteSpace to analyze the knowledge structure of this field from 2000 to 2022 and then reviewed it systematically. The field of Hg emissions from coal-fired power plants has developed steadily. The research hotspots can be divided into three categories: (1) emission characterization research focused on speciation changes and emission calculations; (2) emission control research focused on control technologies; (3) environmental impact research focused on environmental pollution and health risk...
February 21, 2024: Environmental Science and Pollution Research International
https://read.qxmd.com/read/38377898/biodegradation-of-penicillin-g-sodium-by-sphingobacterium-sp-sqw1-performance-degradation-mechanism-and-key-enzymes
#25
JOURNAL ARTICLE
Sinan Zhang, YuXuan Liu, Ali Mohisn, Guohui Zhang, Zejian Wang, Shiyong Wu
Biodegradation is an efficient and cost-effective approach to remove residual penicillin G sodium (PGNa) from the environment. In this study, the effective PGNa-degrading strain SQW1 (Sphingobacterium sp.) was screened from contaminated soil using enrichment technique. The effects of critical operational parameters on PGNa degradation by strain SQW1 were systematically investigated, and these parameters were optimized by response surface methodology to maximize PGNa degradation. Comparative experiments found the extracellular enzyme to completely degrade PGNa within 60 min...
January 11, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38374915/soil-fungal-community-is-more-sensitive-than-bacterial-community-to-modified-materials-application-in-saline-alkali-land-of-hetao-plain
#26
JOURNAL ARTICLE
Xiaolong Bai, En Zhang, Jinmin Wu, Donghai Ma, Chaohui Zhang, Bangyan Zhang, Yunpeng Liu, Zhi Zhang, Feng Tian, Hui Zhao, Bin Wang
Soil salinization has become a major challenge that severely threatens crop growth and influences the productivity of agriculture. It is urgent to develop effective management measures to improve saline-alkali soil. Thus, in this study, soil properties, microbial communities, and function under desulfurization gypsum (DE), soil amendment (SA), farm manure (FA), and co-application of desulfurization gypsum, soil amendment, and farm manure (TA) in a field experiment were examined by high-throughput sequencing...
2024: Frontiers in Microbiology
https://read.qxmd.com/read/38374611/precision-forecasting-of-spray-dry-desulfurization-using-gaussian-noise-data-augmentation-and-k-fold-cross-validation-optimized-neural-computing
#27
JOURNAL ARTICLE
Robert Someo Makomere, Lawrence Koech, Hilary Limo Rutto, Sammy Kiambi
Perceptron models have become integral tools for pattern recognition and classification problems in engineering fields. This study envisioned implementing artificial neural networks to forecast the performance of a mini-spray dryer for desulfurization activities. This work adopted k-fold cross-validation, a rigorous technique that evaluates model performance across multiple data segments. Several ANN models (21) were trained on data obtained from sulfation conditions, including sulfation temperature (120 °C-200 °C), slurry pH (4-12), stoichiometric ratio (0...
February 19, 2024: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://read.qxmd.com/read/38372854/biodesulfurization-of-organosulfur-compounds-by-a-trehalose-biosurfactant-producing-gordonia-sp-isolated-from-crude-oil-contaminated-soil
#28
JOURNAL ARTICLE
Sana Parveen, Nasrin Akhtar, Teerasak E-Kobon, Richard Burchmore, Abdullah Ijaz Hussain, Kalsoom Akhtar
Certain factors hinder the commercialization of biodesulfurization process, including low substrate-specificity of the currently reported desulfurizing bacteria and restricted mass transfer of organic-sulfur compounds in biphasic systems. These obstacles must be addressed to clean organic-sulfur rich petro-fuels that pose serious environmental and health challenges. In current study, a dibenzothiophene desulfurizing strain, Gordonia rubripertincta W3S5 (source: oil contaminated soil) was systematically evaluated for its potential to remove sulfur from individual compounds and mixture of organic-sulfur compounds...
February 19, 2024: World Journal of Microbiology & Biotechnology
https://read.qxmd.com/read/38372122/trace-so-2-capture-within-the-engineered-pore-space-using-a-highly-stable-snf-6-2-pillared-mof
#29
JOURNAL ARTICLE
Weiwei Li, Can Cheng, Guanqun Gao, Haomiao Xu, Wenjun Huang, Zan Qu, Naiqiang Yan
Developing reliable solid sorbents for efficient capture and removal of trace sulfur dioxide (SO2 ) under ambient conditions is critical for industrial desulfurization operations, but poses a great challenge. Herein, we focus on SNFSIX-Cu-TPA, a highly stable fluorinated MOF that utilizes SnF6 2- as pillars, for effectively capturing SO2 at extremely low pressures. The exceptional affinity of SNFSIX-Cu-TPA towards SO2 over CO2 and N2 was demonstrated through single-component isotherms and corroborated by computational simulations...
February 19, 2024: Materials Horizons
https://read.qxmd.com/read/38371767/experimental-study-on-the-erosion-corrosion-characteristics-of-desulfurization-slurry-on-stainless-steel-pipe-materials
#30
JOURNAL ARTICLE
Gaofeng Fan, Jinming Zhang, Tianlin Yuan, Chang'an Wang, Yujie Hou, Xinyue Gao, Jie Xu, Defu Che
The recovery of low-grade waste heat from power plants greatly benefits energy conservation and emission reduction during electricity generation, while the waste heat utilization directly from desulfurization slurry is a significantly promising method to deeply recover such low-grade energy and has been developed in practical application. However, the pipe materials are subjected to erosion and corrosion challenges due to the high level of solid compositions and the presence of harmful ions, such as Cl-1 , which requires further evaluation under the condition of slurry heat exchange...
February 13, 2024: ACS Omega
https://read.qxmd.com/read/38353649/synthesis-of-n-difluoromethyl-carbonyl-compounds-from-n-difluoromethylcarbamoyl-fluorides
#31
JOURNAL ARTICLE
Chunyang Hu, Lvqi Jiang, Zihao Guo, Yasir Mumtaz, Jie Liu, Jiarong Qin, Yixing Chen, Zhongquan Lin, Wen-Bin Yi
Fluorinated small molecules are commonly utilized in the realm of functional small-molecule chemistry, and N-difluoromethyl (N-CF2H) compounds are especially fascinating because of their unique and unexplored physiochemical properties. However, despite limited progress, a general applicable methodological approach to the synthesis of N-CF2H compounds remains elusive. Herein, guided by computation, we present an operationally simple and practical protocol to access N-CF2H amides and related carbonyl derivatives...
February 14, 2024: Angewandte Chemie
https://read.qxmd.com/read/38347032/experimental-study-on-integrated-desulfurization-and-denitrification-of-low-temperature-flue-gas-by-oxidation-method
#32
JOURNAL ARTICLE
Yanyuan Bai, Yungang Wang, Haoran Xiu, Tao Liu, Li Zou, Guoqiang Liao, Qi Xiao
In this paper, TiO2 catalysts doped with different Fe contents (Fe-TiO2 catalysts) were prepared by coprecipitation method and the Fe loading capacity was optimized, and then the integrated pollutant removal experiment was conducted, in which TiO2 doped with Fe as catalyst and H2 O2 as oxidant. The results show that under the condition of constant H2 O2 /(SO2  + NO) molar ratio, low concentration of SO2 can promote the oxidation and removal efficiency of NO, while high concentration of SO2 can inhibit the removal of NOx ...
February 12, 2024: Scientific Reports
https://read.qxmd.com/read/38343365/electrochemical-desulfurative-formation-of-c-n-bonds-through-selective-activation-of-inert-c-sp-3-s-bonds
#33
JOURNAL ARTICLE
Shaopeng Guo, Yujun Li, Qing-Han Li, Ke Zheng
In this study, we introduce an efficient, metal-free electrocatalytic desulfurative protocol for forming C-N bonds by selectively activating inert C(sp3 )-S bonds of alkyl thioethers. This method offers a straightforward and environmentally friendly approach for modification of heterocyclic compounds from readily accessible thioethers. Preliminary mechanistic investigations suggest that the reaction proceeds via a carbocation intermediate. Furthermore, successful synthesis on a 10-gram scale was achieved in a continuous flow electrochemical reactor...
February 12, 2024: Chemical Communications: Chem Comm
https://read.qxmd.com/read/38340515/porous-ionic-liquids-for-oxidative-desulfurization-influenced-by-electrostatic-solvent-effect
#34
JOURNAL ARTICLE
Hongping Li, Wendi Fu, Jie Yin, Jinrui Zhang, Hongshun Ran, Ming Zhang, Wei Jiang, Wenshuai Zhu, Huaming Li, Sheng Dai
Developing a highly efficient strategy for the stabilization of the solid-liquid interface is a persistent pursuit for researchers. Herein, porous ionic liquids based on UiO-66 (Zr) porous materials were synthesized and applied to the selective desulfurization catalysis, which integrates the permanent pores of porous solids with the exceptional properties of ionic liquids. Results show that porous ionic liquids possess high activity and selectivity for dibenzothiophene. Experimental analysis and density functional theory calculations revealed that the ionic liquids moiety served as an extractant to enrich dibenzothiophene into the porous ionic liquids phase through the π···π and CH···π interactions...
February 6, 2024: Journal of Colloid and Interface Science
https://read.qxmd.com/read/38334317/photoinduced-radical-desulfurative-c-sp-3-c-sp-2-coupling-via-electron-donor-acceptor-complexes
#35
JOURNAL ARTICLE
Jiaxuan Shen, Jincan Li, Meijun Chen, Xuerong Yue, Xin Shi
Herein, we disclose a radical desulfurative C-C coupling protocol for the synthesis of 4-alkylpyridines. A variety of substituents on both benzyl thiols and 4-cyanopyridines are tolerated. The reaction is carried out under mild and photocatalyst- and transition-metal-free conditions. Preliminary mechanistic studies show that an electron donor-acceptor complex is formed between benzyl thiols and 4-cyanopyridines under alkaline conditions. Then, a variety of 1°, 2°, and 3° C(sp3 )-centered radicals was formed by cleavage of the C-S bond, and the 4-alkylpyridines were achieved through a radical-radical coupling with the pyridyl radical anion...
February 9, 2024: Organic Letters
https://read.qxmd.com/read/38333781/screening-and-characterization-of-a-denitrifying-chelatococcus-with-strong-desulfurization-capacity
#36
JOURNAL ARTICLE
Chunan Du, Xiaolong Zhao
A denitrifying bacteria, which we named Chelatococcus DNB-15, was screened and isolated from the Shengli Oilfield polymer-containing wastewater. The strain was characterized by 16S rDNA analysis and the effects of nutrient substrate type, pH, mineralization and temperature on the activity of the strain were also investigated. The strain was identified as Chelatococcus , of which the most efficient carbon source is sodium citrate, the most suitable nitrogen source is potassium nitrate, the suitable temperature for growth is 35~45 °C, the suitable pH range for growth is 7...
February 15, 2024: Heliyon
https://read.qxmd.com/read/38330662/regulating-the-spatial-arrangement-of-cuo-and-mgo-within-activated-carbon-matrix-to-maximize-their-room-temperature-h-2-s-removal
#37
JOURNAL ARTICLE
Chao Yang, Zhilong Liu, Zhelin Su, Yeshuang Wang, Yu Feng, Jinhong Luo, Meisheng Liang, Huiling Fan, Teresa J Bandosz
Adsorbents with dual-component active phases have attracted much attention owing to their potential application in synergistic H2 S removal. The influence of spatial arrangements of two components within a support matrix on their desulfurization performance was investigated through regulating the mutual arrangements of CuO and MgO on an activated carbon surface. Their spatial locations were found to remarkably affect interfacial interactions, local pH, the conductivity of adsorbents, and electronic structure of copper oxide...
February 4, 2024: Journal of Colloid and Interface Science
https://read.qxmd.com/read/38326236/an-enzyme-cleavable-solubilizing-tag-facilitates-the-chemical-synthesis-of-mirror-image-proteins
#38
JOURNAL ARTICLE
Yupeng Zheng, Baochang Zhang, Wei-Wei Shi, Xiangyu Deng, Tong-Yue Wang, Dongyang Han, Yuxiang Ren, Ziyi Yang, Yong-Kang Zhou, Jian Kuang, Zhi-Wen Wang, Shan Tang, Ji-Shen Zheng
Mirror-image proteins (D-proteins) are useful in biomedical research for purposes such as mirror-image screening for D-peptide drug discovery, but the chemical synthesis of many D-proteins is often low yielding due to the poor solubility or aggregation of their constituent peptide segments. Here, we report a Lys-C protease cleavable solubilizing-tag and its use to synthesize difficult-to-obtain D-proteins. Our tag is easily installed onto multiple amino acids such as D-Lys, D-Ser, D-Thr and/or the N-terminal D-amino acid of hydrophobic peptides, is impervious to various reaction conditions, such as peptide synthesis, ligation, desulfurization, and transition metal-mediated deprotection, and yet can be completely removed by Lys-C protease under denaturing conditions to give the desired D-protein...
February 7, 2024: Angewandte Chemie
https://read.qxmd.com/read/38325472/transformation-and-environmental-chemical-characteristics-of-hazardous-trace-elements-in-an-800%C3%A2-t-d-waste-incineration-thermal-power-plant
#39
JOURNAL ARTICLE
Shilin Zhao, Siqi Zhang, Xin Liang, Jian Li, Cheng Liu, Fu Ji, Zhiqiang Sun
The hazardous trace elements (HTEs) emitted during the municipal solid waste incineration (MSWI) process have been widely concerned. In this work, the bottom ash (BA), heat recovery boiler ash (HA), and ash after desulfurization (SA) were collected to explore the occurrence forms of HTEs in the three types of ash and their relationship with minerals and leaching characteristics. The results show that the volatility of the seven studied HTEs follows the order of Cd, As > Ni, Zn > Pb > Cr, Cu...
February 5, 2024: Science of the Total Environment
https://read.qxmd.com/read/38324914/n-terminal-proline-editing-for-the-synthesis-of-peptides-with-mercaptoproline-and-selenoproline-mechanistic-insights-lead-to-greater-efficiency-in-proline-native-chemical-ligation
#40
JOURNAL ARTICLE
Brice A Ludwig, Christina R Forbes, Neal J Zondlo
Native chemical ligation (NCL) at proline has been limited by cost and synthetic access. In addition, prior examples of NCL using mercaptoproline have exhibited stalling of the reaction after thioester exchange, due to inefficient S → N acyl transfer. Herein, we develop methods, using inexpensive Boc-4 R -hydroxyproline, for the solid-phase synthesis of peptides containing N-terminal 4 R -mercaptoproline and 4 R -selenoproline. The synthesis proceeds via proline editing on the N-terminus of fully synthesized peptides on the solid phase, converting an N-terminal Boc-4 R -hydroxyproline to the 4 S -bromoproline, followed by an SN 2 reaction with potassium thioacetate or selenobenzoic acid...
February 7, 2024: ACS Chemical Biology
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