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Jiaxing Sun, Heng Chen, Dongxu Qi, Hao Wu, Changsong Zhou, Hongmin Yang
Graphene oxide (GO) is a new promising nanometer material in superconductor and wastewater heavy metal ions removal for its functionalized groups. Ethylenediaminetetraacetic acid functionalized graphene oxide complexes (EDTA-GO) was produced by a realizable silanization chemical reaction. Characteristics of Hg(II) removal in desulfurization wastewater was also under investigation. The chemical composition and microstructures of the EDTA-GO adsorbents were characterized by X-ray photoelectron spectroscopy (XPS), Transmission electron microscope (TEM), Scanning Electron Microscopy (SEM) analyses...
October 10, 2018: Environmental Technology
Jing Wang, Qi-Ying Zhang, Ming-Sheng Xie, Dong-Chao Wang, Gui-Rong Qu, Hai-Ming Guo
An unprecedented cyclization reaction of donor-acceptor oxiranes with N,N'-disubstituted thioureas to construct trans-dihydropyrimidines is presented. Preliminary reaction mechanism studies demonstrated that the reaction underwent sequential cycloaddition/amine ester exchange/oxygen-sulfur exchange/desulfuration/Michael addition process. A wide range of trans-dihydropyrimidines were produced with high yields up to 94% by using this method.
October 8, 2018: Organic Letters
Zu-Jin Lin, He-Qi Zheng, Jin Chen, Wan-E Zhuang, Yue-Xu Lin, Jin-Wei Su, Yuan-Biao Huang, Rong Cao
Clean fuels with extremely low sulfur content are highly desirable due to environmental concerns. Herein, three water-stable and eco-friendly metal-organic frameworks with tunable window diameters, denoted as MOF-808X, have been employed as PTA solid supports. An array of PTA@MOF-808X composites were facilely synthesized via the encapsulation strategy. With tunable window sizes and adjustable PTA loading amounts, the obtained PTA@MOF-808X composites were screened for catalytic oxidative desulfurization (ODS) with H2 O2 serving as oxidant...
October 3, 2018: Inorganic Chemistry
David Kost, Ken J Ladwig, Liming Chen, Tom M DeSutter, Leo Espinoza, L Darrell Norton, Dan Smeal, H Allen Torbert, Dexter B Watts, Richard P Wolkowski, Warren A Dick
Gypsum has a long history as a soil amendment. Information on how flue gas desulfurization (FGD) gypsum affects soil, water, and plant properties across a range of climates and soils is lacking. We conducted a meta-analysis using data from 10 field sites in the United States (Alabama, Arkansas, Indiana, New Mexico, North Dakota, Ohio, and Wisconsin). Each site used three rates each of mined and FGD gypsums plus an untreated control treatment. Gypsum rates included a presumed optimal agronomic rate plus one rate lower and one rate higher than the optimal...
September 2018: Journal of Environmental Quality
Po-Jung Jimmy Huang, Woohyun J Moon, Juewen Liu
Metal ions play a critical role in the RNA-cleavage reaction for interacting with the scissile phosphate and stabilizing the highly negatively charged transition state. Many metal-dependent DNAzymes have been selected for RNA cleavage. Herein, we report that the Ce13d DNAzyme can use non-metallic iodine (I2) to cleave a phosphorothioate (PS)-modified substrate. The cleavage yield exceeded 60% for both the Rp and Sp stereoisomers in 10 sec, while the yield without the enzyme strand was only ~10%. The Ce13d cleavage with I2 also required Na+, consistent with the property of Ce13d and confirming the similar role of I2 as a metal ion...
October 1, 2018: Biochemistry
Meiqin Zheng, Hui Hu, Zhuoliang Ye, Qingming Huang, Xiaohui Chen
In this work, the adsorption desulfurization performance and adsorption diffusion study of B2 O3 modified Ag-CeOx /TiO2 -SiO2 adsorbent were investigated. The adsorption desulfurization performance was studied by batch and fixed bed tests. The homogeneous surface diffusion model (HSDM) was employed to investigate the adsorption and diffusion behavior of 4,6-dimethyldibenzothiophene (4,6-DMDBT) in diesel. It was found that the addition of B2 O3 promotes the dispersion of CeOx species and then further facilitates the dispersion and oxidation of Ag species resulting in higher adsorption desulfurization activity...
September 13, 2018: Journal of Hazardous Materials
Quannan Wang, Zhuqing Liu, Jiang Lou, Zhengkun Yu
Palladium-catalyzed C-S cleavage of tetrasubstituted internal alkene α-oxo ketene dithioacetals was realized with allenoates as the coupling partners, efficiently affording tetrasubstituted 2-alkenylfuran derivatives with excellent regioselectivity under mild conditions. Allenoates acted as C1 synthons in the desulfurative [4 + 1] annulation.
October 5, 2018: Organic Letters
Narges Etemadi, Abbas Akhavan Sepahy, Ghasemali Mohebali, Fatemeh Yazdian, Meisam Omidi
Due to the increasing application of oil and petroleum products, increased environmental contamination has become a matter of concern. Bio-desulfurization process may be used to eliminate sulfur from fossil fuels in the moderate condition. In this study, a thermophilic bacterium was isolated that was able to desulfurize dibenzothiophene. 16S rRNA sequencing indicated that this strain is related closely to Bacillus thermoamylovorans (97%). This strain grew in Basal salt medium containing DBT (100 mgl-1 ) as the only sulfur source, at 55°C and showed maximum growth (OD660  = 0...
September 21, 2018: International Journal of Biological Macromolecules
Anastasiia Kostrytsia, Stefano Papirio, Liam Morrison, Umer Zeeshan Ijaz, Gavin Collins, Piet N L Lens, Giovanni Esposito
In this study, the biokinetics of autotrophic denitrification with biogenic S0 (ADBIOS) for the treatment of nitrogen pollution in wastewaters were investigated. The used biogenic S0 , a by-product of gas desulfurization, was an elemental microcrystalline orthorhombic sulfur with a median size of 4.69 µm and a specific surface area of 3.38 m2 /g, which made S0 particularly reactive and bioavailable. During denitritation, the biomass enriched on nitrite (NO2 - ) was capable of degrading up to 240 mg/l NO2 - -N with a denitritation activity of 339...
September 11, 2018: Bioresource Technology
Suhang Xun, Wei Jiang, Tao Guo, Minqiang He, Ruliang Ma, Ming Zhang, Wenshuai Zhu, Huaming Li
Phosphomolybdate-based ionic liquid [(C8 H17 )3 NCH3 ]3 PMo12 O40 was prepared and supported on a magnetic mesoporous silica (γ-Fe2 O3 @SiO2 @mSiO2 ) to obtain a magnetic mesoporous catalyst. The morphology and components of the catalyst were characterized by FT-IR, XRD, XPS, SEM, TEM, nitrogen adsorption-desorption isotherms, and VSM. With air as oxidant, the catalyst showed perfect desulfurization performance in oxidation of dibenzothiophene (DBT). The removal of DBT from model oil could reach 100% within 5 h at 120 °C...
September 1, 2018: Journal of Colloid and Interface Science
Mohammad Ali Rezvani, Maryam Shaterian, Masomeh Aghmasheh
To preparation of ultra-clean gasoline fuel, a new amphiphilic nanocomposite (TBA-SiWMn@PVA) has been successfully synthesized by supporting sandwich-type silicotungstate polyoxometalate ((n-C4 H9 )4 N)7 H5 Si2 W18 Mn4 O68 (TBA-SiWMn) on polyvinylalcohol (PVA) as an efficient catalyst for catalytic oxidative desulphurization (CODS) of gasoline. The synthesized materials were characterized by means of elemental analysis, 113 Mn NMR, 29 Si NMR, XRD, SEM, FT-IR and UV-vis techniques. The catalytic activity of TBA-SiWMn@PVA nanocomposite was tested on real gasoline in the presence of CH3 COOH/H2 O2 as an oxidant and the results were compared with model sulphur compounds at the same conditions...
September 18, 2018: Environmental Technology
Seyyed Salar Meshkat, Omid Tavakoli, Alimorad Rashidi, Mehdi D Esrafili
This research investigated the adsorption of tertiary butyl mercaptan (TBM) from liquid phases by using nanoporous graphene. Nanoporous graphene synthesized through chemical vapor deposition method was characterized using Brunauer-Emmett-Teller method, transmission electron microscopy, field-emission scanning microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy techniques. The TBM adsorption equilibrium was investigated by using Langmuir, Freundlich, and Tempkin models. The obtained results were in good agreement with the Freundlich isotherm...
September 14, 2018: Ecotoxicology and Environmental Safety
S N Murthy Boddapati, Chandra Mohan Kurmarayuni, Baby Ramana Mutchu, Ramana Tamminana, Hari Babu Bollikolla
A novel, convenient and efficient protocol for the construction of various 2-aminophenyl benzothiazoles by domino intra- and intermolecular C-N cross-coupling reactions of arylisothioureas with aryl iodides using an inexpensive, air stable and readily available copper catalyst is described. The arylisothioureas were obtained from thiourea via copper promoted desulfurization followed by nucleophilic substitution. In addition, the reactivity of arylhalides and the reaction mechanism have also been studied. The protocol features operational simplicity and a broad substrate scope...
September 26, 2018: Organic & Biomolecular Chemistry
Xi-Jun Xu, Bo Shao, Chuan Chen, Ruo-Chen Zhang, Peng Xie, Xue-Ting Wang, Ye Yuan, Ai-Jie Wang, Duu-Jong Lee, Yi-Xing Yuan, Nan-Qi Ren
Micro-aerobic condition has proven to be effective in enhancing sulfide oxidation to elemental sulfur (S0 ) during integrated simultaneous desulfurization and denitrification process (ISDD). In this study we investigated and compared the performance and microbial community of ISDD process operating under initially anoxic, then micro-aerobic and finally switch back to anoxic condition. For all the three tested scenarios, comparable bioreactor performance in terms of sulfate (95.0 ± 4.4%, 90.6 ± 3.8%, 89...
December 2018: Chemosphere
Lorenz G Stock, Sabrina Wildner, Christof Regl, Gabriele Gadermaier, Christian G Huber, Hanno Stutz
The response to thermal stress is an important parameter relevant for characterizing the biological activity and long-term stability of recombinant proteins, which may show irreversible, pH dependent structural changes under these conditions. We selected the recombinant pollen allergen of mugwort ( Artemisia vulgaris) rArt v 3.0201 as a relevant model to study structural changes due to thermal and pH stress by means of capillary zone electrophoresis (CZE)-UV and capillary zone electrophoresis (CZE)-electrospray ionization (ESI)-TOF-MS...
October 3, 2018: Analytical Chemistry
Jianhua Kang, Xiaoqin Gou, Yuehua Hu, Wei Sun, Runqing Liu, Zhiyong Gao, Qingjun Guan
This study introduces the use of a waste by-product from wet limestone flue gas desulfurization as a potential material for fluoride removal. Systematic laboratory-scale experiments were tested to identify the fluoride removal performance and determine the underlying mechanism. Flue gas desulfurization (FGD) gypsum removes 93.31% of fluoride from 109 mg/L to 7.3 mg/L. Fluoride can be efficiently removed at the optimum pH range of 5-11. Kinetics analysis indicates that the theoretical fluoride capacity at 1 g/L FGD gypsum is 96...
February 1, 2019: Science of the Total Environment
Tuhin Ganguly, Ayan Das, Manish Jana, Amit Majumdar
Desulfurization of organosulfur compounds is a highly important reaction because of its relevance to the hydrodesulfurization (HDS) process of fossil fuels. A reaction system involving Co(BF4 )2 ·6H2 O and the dinucleating ligands HBPMP or HPhBIMP has been developed that could desulfurize a large number of thiophenes, sulfides, and thiols to generate the complexes [Co2 (BPMP)(μ2 -SH)(MeCN)](BF4 )2 (1a), [Co2 (BPMP)(SH)2 ](BF4 ) (1b), and [Co2 (PhBIMP)(μ2 -SH)(X)](BF4 )2 [X = DMF (2a), MeCN (2c)], while the substrates are mostly converted to the corresponding alcohols/phenols...
September 17, 2018: Inorganic Chemistry
Annemiek Ter Heijne, Rieks de Rink, Dandan Liu, Johannes B M Klok, Cees J N Buisman
Biological desulfurization under haloalkaliphilic conditions is a widely applied process, in which haloalkalophilic sulfide-oxidizing bacteria (SOB) oxidize dissolved sulfide with oxygen as the final electron acceptor. We show that these SOB can shuttle electrons from sulfide to an electrode, producing electricity. Reactor solutions from two different biodesulfurization installations were used, containing different SOB communities; 0.2 mM sulfide was added to the reactor solutions with SOB in absence of oxygen, and sulfide was removed from the solution...
August 14, 2018: Environmental Science & Technology Letters
Mengmeng Wu, Bingwei Chang, Teik-Thye Lim, Wen-Da Oh, Junxi Lei, Jie Mi
The Zn-Al mixed metal oxide (ZnAl-MMO) with a plate-like structure was derived from Zn-Al layered double hydroxide. The ZnAl-MMO with a Zn/Al molar ratio of 3:1 exhibits superior absorption ability for H2 S in a simulated coal gas at 600 ℃ due to the special structure of the ZnAl-MMO. Besides ZnS, elemental sulfur is also produced during the desulfurization process. The deactivation model could well simulate the absorption behavior of H2 S. The sulfidation reaction over the sorbent shows large initial reaction rate constants (1110-5390 m3  min-1  kg-1 ) and low activation energy (29...
October 15, 2018: Journal of Hazardous Materials
Junpei Ye, Siqi Wang, Panyue Zhang, Mohammad Nabi, Hongjie Wang
This paper reviewed the research literatures published in 2017 about power production waste generated from fuel and nuclear power plants. The treatment, reuse, management and disposal of power production waste were mainly considered. The wastes from different power plants mainly include fly ash, flue gas desulfurization gypsum and waste selective catalytic reduction catalyst, and so on. The monitoring, management, treatment and disposal of power production waste were also reviewed.
October 1, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
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