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Jiansheng Shen, Yidong Xu, Jian Chen, Yao Wang
The use of desulfurization gypsum and steel/furnace slag composite cementitious material (DGSC) to solidify soft soil can fully utilize industrial wastes, reduce cement use and protect natural resources. By studying the unconfined compressive strengths of DGSC-solidified soil with different mix ratios, water-binder ratios and curing periods, the influence of those factors on the unconfined compressive strength of the soil can be analyzed. Furthermore, the quasi-water-cement ratio is introduced to predict the strength of the DGSC-solidified soil...
March 11, 2019: Materials
Marta De Zotti, Jonathan Clayden
Diethylglycine (Deg) homopeptides adopt the rare 2.05 -helical conformation, the longest three-dimensional structure that a peptide of a given sequence can adopt. Despite this unique conformational feature, Deg is rarely used in peptide design because of its poor reactivity. In this paper, we show that reductive desulfurization of oligomers formed from more reactive tetrahydrothiopyran-containing precursors provides a practical way to build the longest Deg homopeptides so far made, and we detail some conformational studies of the Deg oligomers and their heterocyclic precursors...
March 12, 2019: Organic Letters
Jui-Yen Lin, Agnes Raharjo, Li-Hsin Hsu, Yu-Jen Shih, Yao-Hui Huang
Tetrafluoroborate anion (BF4 - ) is found in the streams of flue-gas desulfurization and borosilicate glasses etching which deteriorates water quality through slow hydrolysis into boric acid and fluoride. Decomposition and electrocoagulation (EC) of BF4 - were studied using metallic aluminum as the sacrificial electrode. The dissolved Al(III) from the anode could efficiently decompose BF4 - in forms of fluoroaluminate complexes, and the derived boric acid and fluoride ion were removed by sweep flocculation...
February 27, 2019: Water Research
Qizhao Li, Masatoshi Ishida, Hiroto Kai, Tingting Gu, Chengjie Li, Xin Li, Glib Baryshnikov, Xu Liang, Weihua Zhu, Hans Ågren, Hiroyuki Furuta, Yongshu Xie
A newly synthesized hybrid thia-norhexaphyrin comprising a directly linked N-confused pyrrole and thiophene unit (1) revealed unique macrocycle transformations to afford multiply inner-annulated aromatic macrocycles. Oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinoe triggered a cleavage of the C-S bond of the thiophene unit, accompanied with skeletal rearrangement to afford unique π-conjugated products: a thiopyrrolo-pentaphyrin embedded with a pyrrolo[1,2]isothiazole (2), a sulfur-free pentaphyrin incorporating an indolizine moiety with stronger global aromaticity (3), and a 14π locally aromatic thiopyranyltriphyrinoid containing a 2H-thiopyran unit (4)...
March 7, 2019: Angewandte Chemie
Christopher Paul Kasanke, R Eric Collins, Mary Beth Leigh
Sulfolane is an industrial solvent and emerging organic contaminant affecting groundwater around the world, but little is known about microbes capable of biodegrading sulfolane or the pathways involved. We combined DNA-based stable isotope probing (SIP) with genome-resolved metagenomics to identify microorganisms associated with sulfolane biodegradation in a contaminated subarctic aquifer. In addition to 16S rRNA gene amplicon sequencing, we performed shotgun metagenomics on the 13 C-labeled DNA to obtain functional and taxonomic information about the active sulfolane-degrading community...
February 28, 2019: Scientific Reports
Longfei Wu, Arno J F van Hoof, Nelson Y Dzade, Lu Gao, Marie-Ingrid Richard, Heiner Friedrich, Nora H De Leeuw, Emiel J M Hensen, Jan P Hofmann
Transition metal dichalcogenides (TMDs), such as MoS2 and WS2, are promising alternative non-noble metal catalysts to drive the electrocatalytic H2 evolution reaction (HER). However, their catalytic performance is inherently limited by the small number of active sites as well as their poor electrical conductivity. Here, we grow vertically aligned 2H-WS2 on different substrates to expose their edge sites for the HER and introduce a scalable approach to tune these active sites via defect engineering. In a thermal hydrogen treatment procedure, sulfur vacancies and metallic tungsten nanoparticles are formed...
February 27, 2019: Physical Chemistry Chemical Physics: PCCP
Qingke Nie, Wei Hu, Baoshan Huang, Xiang Shu, Qiang He
As an industrial waste characterized by huge volume and high alkalinity, red mud has become a serious environmental problem. The reuse of red mud has been explored in previous studies, including as building materials and for soil and waste water treatment. In this study, an innovation was made for the reuse of red mud to create a synergistic effect. Red mud was first used in flue gas desulfurization (FGD), and then the desulfurized red mud was again reused to make a geopolymer material. By using one type of original red mud and three types of fly ash, this study revealed that with high alkalinity and desulfurization capacity, the red mud could serve as an excellent FGD sorbent...
February 16, 2019: Journal of Hazardous Materials
Yan Zhang, Peixin Zhang, Weikang Yu, Jinghan Zhang, Jiejing Huang, Jun Wang, Mai Xu, Qiang Deng, Zhe Ling Zeng, Shuguang Deng
It is very challenging to achieve efficient and deep desulfurization, especially, in flue gases with an extremely low SO2 concentration. Herein, we report a microporous metal-organic framework (ELM-12) with specific polar sites and proper pore size for the highly efficient removal of SO2 from flue gas and other SO2-containing gases. A high SO2 capacity of 61.2 cm3 g-1 combined with exceptionally outstanding selectivity of SO2/CO2 (30), SO2/CH4 (871), and SO2/N2 (4064) under ambient conditions (i.e., 10:90 mixture at 298 K and 1 bar) was achieved...
February 26, 2019: ACS Applied Materials & Interfaces
Ran Xia, Wenjie Lv, Kaiqing Zhao, Shihao Ma, Jun Hu, Hualin Wang, Honglai Liu
A Pickering emulsion catalytic system was proposed to reduce the transfer limitation between two immiscible reactant phases for enhancing the kinetics of heterogenetic oxidative desulfurization (ODS). By loading phosphotungstic acid (HPW) nanoparticles on a novel pyridine-based porous organic polymer of P[tVPB-VPx], the amphiphilic catalysts were produced and used as the stabilizer for Pickering emulsions. Specifically, an ultra-fast ODS rate was realized in the HPW/P[tVPB-VP1] stabilized Pickering emulsion catalytic system, that just within 15 min, 100 ppm dibenzothiophene (DBT) was completely oxidized by H2O2...
February 25, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Bo Wang, Zihe Pan, Zhiping Du, Huaigang Cheng, Fangqin Cheng
As one of the typical solid-wastes, FGD gypsum usually occupies land and causes resource waste and environmental pollution. Its high content of CaSO4 ·2H2 O shows highly potential in synthesizing CaCO3 by incorporating CO2 . Nevertheless, the impurities in FGD gypsum have significant effects on polymorph of CaCO3 and the formation mechanism of CaCO3 polymorph during FGD gypsum carbonation was still unclear. Here, we selected CaSO4 ·2H2 O as model to explore the effects of impurities of muscovite and dolomite in FGD gypsum on polymorph of CaCO3 during carbonation...
February 4, 2019: Journal of Hazardous Materials
Krakowiak Agnieszka, Piotrzkowska Danuta, Kocoń-Rębowska Beata, Kaczmarek Renata, Maciaszek Anna
Phosphorothioate oligonucleotides (PS-oligos) containing sulfur atom attached in a nonbridging position to the phosphorus atom at one or more internucleotide bond(s) are often used in medicinal applications. Their hydrolysis in cellular media proceeds mainly from the 3'-end, resulting in the appearance of nucleoside 5'-O-phosphorothioates ((d)NMPS), whose further metabolism is poorly understood. We hypothesize that the enzyme responsible for (d)NMPS catabolism could be Hint1, an enzyme that belongs to the histidine triad (HIT) superfamily and is present in all organisms...
February 14, 2019: Biochemical Pharmacology
Rui Li, Qiao Li, Xiuyun Sun, Jiansheng Li, Jinyou Shen, Weiqing Han, Lianjun Wang
This study introduces the application of the Fe(III)/flue gas desulfurization gypsum (FGDG) system to remove EDTA-chelated Pb(II). Systematic experiments were conducted to explore the possibility of removing EDTA-chelated Pb(II) and the crucial factors of the removal process, as well as to determine the underlying removal mechanism. The results showed that the removal reaction was a quick process, with the removal rate exceeding 90% after 1 min. The system removed 97.35% of EDTA-chelated Pb(II), reducing its concentration from 700 mg/L to 18...
January 31, 2019: Journal of Colloid and Interface Science
Harshada Sowani, Mohan Kulkarni, Smita Zinjarde
The genus Gordonia includes variedly pigmented aerobic, non-motile, non-sporulating Gram positive (sometimes variable) coccoid forms and rods. Different isolates display distinguishing physiological traits and biochemical properties that are significant in remediation applications. Strains inherently prevalent in soils, seawater, sediments and wastewaters can degrade hydrocarbons. Immobilized cells and microbial consortia containing Gordonia species have been used for in situ applications. Hydrocarbon uptake in this Actinomycete is mediated by attachment to large droplets or by pseudosolubilization of substrates...
February 13, 2019: Biotechnology Advances
Yang Zhuo, Yun Han, Qiliang Qu, Jie Li, Chen Zhong, Dangcong Peng
This study investigated the characteristics of low H2 S concentration biogas biodesulfurization using a lab-scale biotrickling filter (BTF). The influence of operational parameters on H2 S removal efficiency and H2 S distributions in packed bed was evaluated by establishing a counter-current one-dimensional multi-layer BTF model and statistical analysis of the simulation results. The overall biodesulfurization efficiency of counter-current BTF on treating low H2 S concentration was 92.27 ± 10.30%. The H2 S distribution of the BTF packed bed could be predicted by the calibrated BTF model...
February 2, 2019: Bioresource Technology
Ted Nuorivaara, Anna Björkqvist, John Bacher, Rodrigo Serna-Guerrero
The removal of sulfidic species in tailings using froth flotation is a promising approach to prevent phenomena such as acid mine drainage. However, flotation requires the consumption of reagents and water that represent additional expenses. Despite the strong interest of scientists and industry alike on tailings remediation, there is no study on the minimization of resource consumption to promote the implementation of desulfurization with froth flotation. Following a systematic analysis based on Design of Experiments (DoE), this work aims to determine the implications of a decrease in the consumption of flotation reagents and fresh water...
February 2, 2019: Journal of Environmental Management
Yun Xie, Leon Yu Zheng Li, Weiyu Hao, Jing Chang, Peng Xu, Baoyuan Guo, Jianzhong Li, Huili Wang
Prothioconazole (PTC) is a widely used triazolinthione fungicide with low toxicity and short residual period. However, its desulfurization metabolite, prothioconazole-desthio (PTC-d), is more persistent and has higher toxicity in terrestrial animals. In this study, the toxicokinetics (TK) and tissue distribution of PTC and PTC-d in Chinese lizards (Eremias argus) were measured following single oral dose (100 mg kg-1 body weight) treatments. TK parameters indicated that PTC was more rapidly absorbed than PTC-d, as indicated by its shorter time to reach peak concentrations in most tissues...
January 22, 2019: Environmental Pollution
Shuangchen Ma, Jin Chai, Gongda Chen, Kai Wu, Yajun Xiang, Zhongcheng Wan, Jingrui Zhang, Hongtao Zhu
Since the promulgation of "Water Pollution Control Action Plan " in China, zero liquid discharge of desulfurization wastewater has become a new trend of power plant water pollution control. Aiming at the application of desulfurization wastewater evaporation technology using high-temperature flue gas, simulation and experimental research on quantifying and predicting gas-solid partitioning of chlorine ion under different operation conditions are carried out in this paper. The gas-liquid equilibrium theory is applied to the complex mixed salt system; based on state equation, the semi-empirical model of gas-solid phase partitioning coefficient of chlorine ion is calculated, with high degree of fitting range from 180 to 380 °C...
January 30, 2019: Environmental Science and Pollution Research International
Hong Chen, Yiyu Wang, Yanxiao Wei, Liang Peng, Bo Jiang, Gang Li, Guanlong Yu, Chunyan Du
To upgrade a wet flue gas desulfurization (FGD) wastewater treatment process in a typical thermal power plant (TPP) in Hunan province, China, a new concept for reusing polyaluminum chloride (PAC)-based water treatment plant sludge (WTPS) as a coagulant is proposed. Results show that, for an optimal WTPS dosage of 1,000 mg/L, the corresponding removal capacities for suspended solids (SS) and chemical oxygen demand (COD) from the practical FGD wastewater were 58.3% and 40.3%, respectively. Through an advanced treatment with a dosage of 50 mg/L of PAC, pH of 9, and stirring of 150 r/min for 60 s and 50 r/min for 15 min, the total removal efficiencies of SS, COD, and total cadmium (Cd) from the FGD wastewater were 93...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Gang Wang, Zizhen Ma, Jianguo Deng, Zhen Li, Lei Duan, Qiang Zhang, Jiming Hao, Jingkun Jiang
The performance of traditional electrostatic precipitators (ESPs) is strongly affected by the flue gas temperature. Operating under much lower temperatures (e.g., ~90 °C), the low-low temperature electrostatic precipitators (LLT-ESPs) are considered as an effective technology to improve the particulate matter (PM) removal efficiency in coal-fired power plants (CFPPs). Wet flue gas desulfurization (WFGD) can also be affected by the decrease in the operating temperature of the ESP. This study evaluates the influence of various ESP operating temperatures on ESP performance, PM2...
January 22, 2019: Science of the Total Environment
Renata M Aguiar, Raquel A C Leão, Alejandro Mata, David Cantillo, C Oliver Kappe, Leandro S M Miranda, Rodrigo O M A de Souza
Continuous-flow production of chiral intermediates plays an important role in the development of building blocks for Active Pharmaceutical Ingredients (APIs), being α-amino acids and their derivatives widely applied as building blocks. In this work we developed two different strategies for the synthesis of intermediates used on the synthesis of levetiracetam/brivaracetam and ethambutol. The results obtained show that methionine methyl ester can be continuously converted to the desired ethambutol intermediate by RANEY® Nickel dessulfurization/reduction strategy whereas levetiracetam/brivaracetam intermediates could be synthesized by both RANEY® Nickel (without H2) and Pd/C-H2 approach or by photochemical desulfurization...
January 29, 2019: Organic & Biomolecular Chemistry
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