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1. Total synthesis of diazaquinomycins H and J using double Knorr cyclization in the presence of triisopropylsilane

Author:
Prior, Allan M.; Sun, Dianqing
Source:
RSC advances 2019 v.9 no.4 pp. 1759-1771
ISSN:
2046-2069
Subject:
sulfuric acid,   etc   ; isomerization; spectral analysis;     Show all 3 Subjects
Abstract:
... The first total synthesis of diazaquinomycins H (1) and J (2), which are promising anti-tuberculosis natural product leads, has been achieved via selective amidation of diamine 6 with Meldrum's acid derivatives, subsequent EDC coupling with 3-oxobutanoic acid, followed by double Knorr cyclization in the presence of triisopropylsilane (TIPS). We found that the addition of TIPS was crucial to obtain ...
DOI:
10.1039/c8ra09792e

2. Evaluation of a dichromate oxidation method for the isolation and quantification of black carbon in ancient geological samples

Author:
Zhu, Mengbo; Li, Meiju; Wei, Siye; Song, Jianzhong; Hu, Jianfang; Jia, Wanglu; Peng, Ping'an
Source:
Organic geochemistry 2019 v.133 pp. 20-31
ISSN:
0146-6380
Subject:
sulfuric acid,   etc   ; charcoal; organic carbon; oxidants; oxidation; sediments; stable isotopes;     Show all 7 Subjects
Abstract:
... The dichromate oxidation method is widely used in measurements of black carbon (BC) in geological sediments. The separation of organic carbon (OC) and BC is a critical step in the procedure. A comprehensive evaluation of the dichromate oxidation method was conducted using three types of kerogen with different maturities and two charcoal samples. The residues of each kerogen/BC oxidized under diffe ...
DOI:
10.1016/j.orggeochem.2019.03.009

3. Chemical characterization methods for the analysis of structural extracellular polymeric substances (EPS)

Author:
Felz, Simon; Vermeulen, Pascalle; van Loosdrecht, Mark C.M.; Lin, Yue Mei
Source:
Water research 2019 v.157 pp. 201-208
ISSN:
0043-1354
Subject:
sulfuric acid,   etc   ; biofilm; colorimetry; phenol; polymers; proteins; sludge; uronic acids;     Show all 8 Subjects
Abstract:
... Biofilm structure and functionality depend on extracellular polymeric substances (EPS), but analytical methods for EPS often lack specificity which limits progress of biofilm research.EPS were extracted from aerobic granular sludge and analyzed with frequently applied colorimetric methods. The colorimetric methods were evaluated based on their applicability for EPS analysis. EPS fractions of inter ...
DOI:
10.1016/j.watres.2019.03.068

4. SuFEx-based strategies for the preparation of functional particles and cation exchange resins

Author:
KassickAuthors contributed equally to this manuscript., Andrew J.; Chen, Li; Kovaliov, Marina; Mathers, Robert T.; Locklin, Jason; Averick, Saadyah
Source:
Chemical communications 2019 v.55 no.27 pp. 3891-3894
ISSN:
1364-548X
Subject:
sulfuric acid,   etc   ; cation exchange resins; hydrogen; hydrolysis; polymers; sulfates;     Show all 6 Subjects
Abstract:
... A predictable and reproducible number of sulfuric acid sites have been achieved for cation exchange resins by employing a mild SuFEx-based reagent system to effect the hydrolysis of fluorosulfonated polymer beads. The resultant poly(hydrogen sulfate) beads effectively demonstrate their utility as cation exchange resins in ion-capture experiments. Furthermore, their polyfluorosulfonated precursors ...
DOI:
10.1039/c9cc00036d

5. Goodbye to Quinine in Sulfuric Acid Solutions as a Fluorescence Quantum Yield Standard

Author:
Nawara, Krzysztof; Waluk, Jacek
Source:
Analytical chemistry 2019 v.91 no.8 pp. 5389-5394
ISSN:
1520-6882
Subject:
sulfuric acid,   etc   ; absorption; ambient temperature; fluorescence; perchloric acid; quinine; rhodamines;     Show all 7 Subjects
Abstract:
... Quinine is by far the most popular fluorescence quantum yield standard used nowadays. In this work, we exploit a modified version of a recently developed SAFE (simultaneous absorption and emission measurement) method for investigating the temperature dependence of fluorescence quantum yields. The accuracy of the method was verified using rhodamine 6G and rhodamine B solutions, which have well char ...
DOI:
10.1021/acs.analchem.9b00583

6. An acid-pasting approach towards perylenetetracarboxylic diimide based lithium/sodium ion battery cathodes with high rate performances

Author:
Wu, Dongqing; Jing, Fan; Xi, Xin; Ma, Lie; Lu, Deng; Yang, Peng; Liu, Ruili
Source:
Journal of colloid and interface science 2019 v.538 pp. 597-604
ISSN:
0021-9797
Subject:
sulfuric acid,   etc   ; cathodes; electrochemistry; lithium; lithium batteries; manufacturing; mixing; soot;     Show all 8 Subjects
Abstract:
... An acid-pasting approach is developed in this work to fabricate the composite of perylenetetracarboxylic diimide (PTCDI) and carbon black in concentrated sulfuric acid. Different from traditional mechanical mixing, the solution-based fabrication strategy enables the sufficient blending of PTCDI as active component and carbon black as conductive agent in the PTCDI/CB composite. Serving as the catho ...
DOI:
10.1016/j.jcis.2018.11.085

7. CFD simulation and optimization of industrial boiler

Author:
Echi, Souhir; Bouabidi, Abdallah; Driss, Zied; Abid, Mohamed Salah
Source:
Energy 2019 v.169 pp. 105-114
ISSN:
0360-5442
Subject:
sulfuric acid,   etc   ; combustion; fluid mechanics; heat transfer; mathematical models; temperature;     Show all 6 Subjects
Abstract:
... This paper aimed to develop a computational fluid dynamics simulation for an industrial boiler. The industrial boiler is used for the sulfuric acid production. A numerical model is carried out using the commercial code “ANSYS-FLUENT”. The simulations are developed for the case of the industrial boiler and a new proposed design. A clear understanding of the combustion phenomenon and the fluid flow ...
DOI:
10.1016/j.energy.2018.12.006

8. Selective through-holing of anodic porous alumina membranes with large area

Author:
Yanagishita, Takashi; Okubo, Yuki; Kondo, Toshiaki; Masuda, Hideki
Source:
RSC advances 2018 v.8 no.67 pp. 38455-38460
ISSN:
2046-2069
Subject:
sulfuric acid,   etc   ; aluminum; aluminum oxide;     Show all 3 Subjects
Abstract:
... Anodic porous alumina membranes with site controlled through-holes were prepared by the formation of a masking layer on the surface of anodic porous alumina and subsequent selective second anodization in concentrated sulfuric acid to form a readily soluble layer. After the anodization, the residual Al substrate was removed, and the highly soluble alumina layer formed in concentrated sulfuric acid ...
DOI:
10.1039/c8ra07646d

9. The role of cupric ions in the oxidative dissolution process of marmatite: A dependence on Cu2+ concentration

Author:
Meng, Xiaoyu; Zhao, Hongbo; Sun, Menglin; Zhang, Yisheng; Zhang, Yanjun; Lv, Xin; Kim, Hyunjung; Vainshtein, Mikhail; Wang, Shuai; Qiu, Guanzhou
Source:
The Science of the total environment 2019 v.675 pp. 213-223
ISSN:
0048-9697
Subject:
sulfuric acid,   etc   ; Raman spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; copper; electrochemistry; ions; leaching;     Show all 9 Subjects
Abstract:
... Cupric ions (Cu2+) play an important role in the oxidative dissolution process of marmatite in an acidic environment. In this work, dissolution experiments and numerous analytical techniques were utilized to investigate the role of Cu2+ in the oxidative dissolution process of marmatite in sulfuric acid. The dissolution experiments showed that the role of Cu2+ is significantly dependent on its conc ...
DOI:
10.1016/j.scitotenv.2019.04.227

10. Chlorinated holey double-walled carbon nanotubes for relative humidity sensors

Author:
Bulusheva, L.G.; Sysoev, V.I.; Lobiak, E.V.; Fedoseeva, Yu.V.; Makarova, A.A.; Dubois, M.; Flahaut, E.; Okotrub, A.V.
Source:
Carbon 2019 v.148 pp. 413-420
ISSN:
0008-6223
Subject:
sulfuric acid,   etc   ; carbon; carbon nanotubes; chlorine; density functional theory; dispersibility; oxygen; relative humidity; solvents; vapors;     Show all 10 Subjects
Abstract:
... A chemical procedure for modification of double-walled carbon nanotubes (DWCNTs) to enhance their response to humidity was developed. The DWCNTs walls were etched by hot concentrated sulfuric acid, after what the edge carbon sites were saturated by chlorine via reaction with CCl4 vapor. This treatment increases the dispersibility of DWCNTs in solvents, removes oxygen groups, and produces chlorine- ...
DOI:
10.1016/j.carbon.2019.04.010

11. Conversion of Oil Palm Kernel Shell Biomass to Activated Carbon for Supercapacitor Electrode Application

Author:
Misnon, Izan Izwan; Zain, Nurul Khairiyyah Mohd; Jose, Rajan
Source:
Waste and biomass valorization 2019 v.10 no.6 pp. 1731-1740
ISSN:
1877-2641
Subject:
sulfuric acid,   etc   ; activated carbon; biomass; capacitance; electrochemistry; electrodes; electrolytes; energy density; potassium hydroxide; sodium sulfate;     Show all 10 Subjects
Abstract:
... Electrochemical charge storage of physically and chemically activated carbon synthesized from oil palm kernel shell (PKS) in three different aqueous electrolytes (1 M H₂SO₄, 1 M Na₂SO₄ and 6 M KOH) are presented. Coin type CR2032 cells fabricated using the PKS ACs electrodes separated by fiber glass separator and electrolyte are used as devices for measurements. Achievable operating potential for ...
DOI:
10.1007/s12649-018-0196-y

12. Dilute-sulfuric acid pretreatment of de-starched cassava stems for enhancing the enzymatic convertibility and total glucan recovery

Author:
Martín, Carlos; Peinemann, Jan Christoph; Wei, Maogui; Stagge, Stefan; Xiong, Shaojun; Jönsson, Leif J.
Source:
Industrial crops and products 2019 v.132 pp. 301-310
ISSN:
0926-6690
Subject:
sulfuric acid,   etc   ; amylases; byproducts; cassava; cellulose; digestion; enzymatic hydrolysis; experimental design; feedstocks; fuels; starch; stems; temperature;     Show all 13 Subjects
Abstract:
... Cassava stems are an abundant feedstock that is becoming attractive for biochemical conversion to fuels and chemicals. Since cassava stems are rich in both cellulose and starch, carefully designed pretreatment and digestion procedures are required for achieving high glucan recovery. In this study, partially de-starched cassava stems resulting from a water extraction stage were hydrolyzed with amyl ...
DOI:
10.1016/j.indcrop.2019.02.037

13. Effect of particle size on uranium bioleaching in column reactors from a low-grade uranium ore

Author:
Wang, Xuegang; Sun, Zhanxue; Liu, Yajie; Min, Xiaobo; Guo, Yadan; Li, Peng; Zheng, Zhihong
Source:
Bioresource technology 2019 v.281 pp. 66-71
ISSN:
0960-8524
Subject:
sulfuric acid,   etc   ; Acidithiobacillus ferrooxidans; bioleaching; iron; leaching; particle size; temperature; uranium;     Show all 8 Subjects
Abstract:
... This study evaluated the effectiveness of ore particle size on column bioleaching from low-grade uranium ore using an indigenous Acidithiobacillus ferrooxidans, isolated from local uranium ore. The uranium content was 0.033% by weight and ore particle size was crushed to <50 mm, <30 mm, and <15 mm. The additive content of sulfuric acid 5 g/L, Fe3+ dosage of 5.0 g/L, spray strength of 2.57 L/(h·m2) ...
DOI:
10.1016/j.biortech.2019.02.065

14. Rapid thermal-acid hydrolysis of spiramycin by silicotungstic acid under microwave irradiation

Author:
Chen, Zheng; Dou, Xiaomin; Zhang, Yu; Yang, Min; Wei, Dongbin
Source:
Environmental pollution 2019 v.249 pp. 36-44
ISSN:
0269-7491
Subject:
sulfuric acid,   etc   ; acidity; catalytic activity; equations; hydrolysis; microwave radiation; moieties; spiramycin; wastewater;     Show all 9 Subjects
Abstract:
... Spiramycin is a widely used macrolide antibiotic and exists at high concentration in production wastewater. A thermal-acid hydrolytic pretreatment using silicotungstic acid (STA) under microwave (MW) irradiation was suggested to mitigate spiramycin from production wastewater. Positive correlations were observed between STA dosage, MW power, interaction time and the hydrolytic removal efficiencies, ...
DOI:
10.1016/j.envpol.2019.02.074

15. Maximization of extraction of Cadmium and Zinc during recycling of spent battery mix: An application of combined genetic programming and simulated annealing approach

Author:
Yun, Liu; Li, Wei; Garg, Akhil; Maddila, Sivasriprasanna; Gao, Liang; Fan, Zhun; Buragohain, P.; Wang, Chin-Tsan
Source:
Journal of cleaner production 2019 v.218 pp. 130-140
ISSN:
0959-6526
Subject:
sulfuric acid,   etc   ; algorithms; cadmium; economic feasibility; leaching; liquids; lithium; lithium batteries; recycling; sodium metabisulfite; zinc;     Show all 11 Subjects
Abstract:
... There are a number of government directives and regulations as well as many public schemes on the recycling of batteries, in spite of this; the quantity of batteries that are actually recycled is still very low. Current production capacity cannot meet projected demand of Lithium-ion batteries. To counter this, the reclamation and repurposing of metals like cadmium, Lithium and Zinc from used or sp ...
DOI:
10.1016/j.jclepro.2018.11.226

16. One-pot aqueous synthesis of two-dimensional porous bimetallic PtPd alloyed nanosheets as highly active and durable electrocatalyst for boosting oxygen reduction and hydrogen evolution

Author:
Chen, Hong-Yan; Jin, Mi-Xue; Zhang, Lu; Wang, Ai-Jun; Yuan, Junhua; Zhang, Qian-Li; Feng, Jiu-Ju
Source:
Journal of colloid and interface science 2019 v.543 pp. 1-8
ISSN:
0021-9797
Subject:
sulfuric acid,   etc   ; catalysts; electrochemistry; electrolytes; energy; hydrogen production; nanosheets; oxygen; potassium hydroxide; stabilizers; surface area;     Show all 11 Subjects
Abstract:
... Recently, two-dimensional materials have gained increasing research attention due to their large surface area, high physical and chemical stability, and excellent electrocatalytic performances. Herein, we reported a simple and fast one-pot aqueous method for synthesis of two-dimensional porous bimetallic PtPd alloyed nanosheets (NSs) using benzyldimethylhexadecylammonium chloride (HDBAC) as the ca ...
DOI:
10.1016/j.jcis.2019.01.122

17. Desulfurization of lignin produced by hydrolysis of wood with dilute sulfuric acid

Author:
Evdokimov, Andrey N.; Kurzin, Alexander V.; Fedorova, Olesya V.; Trifonova, Alena D.
Source:
European journal of wood and wood products 2019 v.77 no.3 pp. 491-493
ISSN:
0018-3768
Subject:
sulfuric acid,   etc   ; byproducts; desulfurization; ethanol production; hydrolysis; lignin; sodium hydroxide; sulfates; sulfonates; sulfur; wood;     Show all 11 Subjects
Abstract:
... The hydrolysis (or hydrolytic) lignin as a byproduct of ethanol production is made by the treatment of wood with a sulfuric acid solution. It contains up to 2% total sulfur. This work proposes the hydrolysis lignin desulfurization by acid–base methods. These methods are based on data on the presence of residual sulfuric acid and its reaction products (organic sulfates and sulfonates) with wood com ...
DOI:
10.1007/s00107-019-01398-8

18. A novel aqueous sodium–manganese battery system for energy storage

Author:
Feng, Yazhi; Zhang, Qiu; Liu, Shuang; Liu, Jian; Tao, Zhanliang; Chen, Jun
Source:
Journal of materials chemistry A 2019 v.7 no.14 pp. 8122-8128
ISSN:
2050-7496
Subject:
sulfuric acid,   etc   ; anodes; batteries; cathodes; cost effectiveness; electric potential difference; electrochemistry; electrolytes; graphene; sodium; sodium sulfate;     Show all 11 Subjects
Abstract:
... Rechargeable aqueous sodium-ion batteries have become promising candidates for electrochemical grid-scale energy storage systems because of the rich natural abundance of sodium and the favourable safety of aqueous electrolytes. However, the electrochemical stability window of water limits the selection of electrode materials, and the poor performance of electrode materials hinders the comprehensiv ...
DOI:
10.1039/c9ta00474b

19. A theoretical study on the activation of insoluble particles in atmospheric conditions

Author:
Lazaridis, Mihalis
Source:
Atmospheric research 2019 v.218 pp. 306-314
ISSN:
0169-8095
Subject:
sulfuric acid,   etc   ; aerosols; ambient temperature; chemical composition; models; particle size; probability; vapors;     Show all 8 Subjects
Abstract:
... A theoretical analysis for the description of insoluble particles activation in the atmosphere has been performed using as framework the classical theory of heterogeneous nucleation. In the current work a model for heterogeneous nucleation for one-component and two-component gaseous systems was presented taking into account the process of surface diffusion during nucleating embryo formation. The t ...
DOI:
10.1016/j.atmosres.2018.12.013

20. Simultaneous voltammetric determination of acetaminophen and isoniazid using MXene modified screen-printed electrode

Author:
Zhang, Yu; Jiang, Xiantao; Zhang, Junjie; Zhang, Han; Li, Yingchun
Source:
Biosensors & bioelectronics 2019 v.130 pp. 315-321
ISSN:
0956-5663
Subject:
sulfuric acid,   etc   ; acetaminophen; biosensors; drug formulations; electrodes; hepatotoxicity; isoniazid; liver; oxidation;     Show all 9 Subjects
Abstract:
... Determination of hepatotoxic drugs is critical for both clinical diagnosis and quantity control of their pharmaceutical formulations. In this work, a facile and sensitive sensor based on MXene modified screen-printed electrode (MXene/SPE) has been developed for detection of acetaminophen (ACOP) and isoniazid (INZ), which are two commonly used drugs but might induce liver damage in certain circumst ...
DOI:
10.1016/j.bios.2019.01.043