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1. Preparation of N/S doped carbon dots and their application in nitrite detection

Author:
Deng, Yafeng; Qian, Jun; Zhou, Yihua; Niu, Yifan
Source:
RSC advances 2021 v.11 no.18 pp. 10922-10928
ISSN:
2046-2069
Subject:
sulfuric acid,   etc   ; ammonia; detection limit; fluorescence; nitrites;     Show all 5 Subjects
Abstract:
... Detection of carcinogens is generally recognized to be meaningful, especially for nitrites (NO₂⁻). Here blue-green fluorescent carbon dots (CDs) were successfully synthesized by using p-aminobenzenesulfonic acid, and their surfaces were identified to be abundant in the functional groups of amino, hydroxyl, and sulfuric acid. Importantly, the sulfuric acid group and aromatic primary ammonia groups ...
DOI:
10.1039/d0ra10766b

2. Determination of Molar Substitution of γ‐Hydroxypropyl Starch

Author:
Liu, Xue‐Li; Zhang, Kun; Hu, Yu; Zhang, Zhengjuan; Chen, Jun; Ma, TianLin; Wang, JiaJia
Source:
DieStärke = 2021 v.73 no.3-4 pp. e2000013
ISSN:
0038-9056
Subject:
sulfuric acid,   etc   ; chromatography; color; colorimetry; oxidation; starch;     Show all 6 Subjects
Abstract:
... A new class of hydroxypropyl starch, γ‐hydroxypropyl starch (γ‐HPS), is synthesized by using 3‐chloropropanol as the etherifying reagent. Two independent procedures for the determination of the number of moles of alkylene oxide combined per anhydroglucose unit (molar substitution, MS) in γ‐HPS are described. The feasibility of the Zeisel‐gas chromatographic technique and colorimetric determination ...
DOI:
10.1002/star.202000013

3. Efficient removal and recovery of arsenic from copper smelting flue dust by a roasting method: Process optimization, phase transformation and mechanism investigation

Author:
Zhang, Wenjuan; Che, Jianyong; Xia, Liu; Wen, Peicheng; Chen, Jun; Ma, Baozhong; Wang, Chengyan
Source:
Journal of hazardous materials 2021 v.412 pp. 125232
ISSN:
0304-3894
Subject:
sulfuric acid,   etc   ; arsenates; arsenic; carcinogenicity; coal; dust; oxidation; temperature; thermodynamics;     Show all 9 Subjects
Abstract:
... The efficient removal and recovery of arsenic from copper smelting flue dust have received widespread attention due to its extremely high toxicity and carcinogenicity. In this research, a roasting method used for treating the dust at a relatively low temperature (300–400 ℃), with adding sulfuric acid and bitumite, was proposed, in which the reduction of As(Ⅴ) and oxidation of arsenic sulfides were ...
DOI:
10.1016/j.jhazmat.2021.125232

4. Hydrometallurgical recycling of EV lithium-ion batteries: Effects of incineration on the leaching efficiency of metals using sulfuric acid

Author:
Vieceli, Nathália; Casasola, Raquel; Lombardo, Gabriele; Ebin, Burçak; Petranikova, Martina
Source:
Waste management 2021 v.125 pp. 192-203
ISSN:
0956-053X
Subject:
sulfuric acid,   etc   ; circular economy; electrodes; graphene; temperature; wastes;     Show all 6 Subjects
Abstract:
... The growing demand for lithium-ion batteries will result in an increasing flow of spent batteries, which must be recycled to prevent environmental and health problems, while helping to mitigate the raw materials dependence and risks of shortage and promoting a circular economy. Combining pyrometallurgical and hydrometallurgical recycling approaches has been the focus of recent studies, since it ca ...
DOI:
10.1016/j.wasman.2021.02.039

5. Novel sustainable alternatives for the fashion industry: A method of chemically recycling waste textiles via acid hydrolysis

Author:
Sanchis-Sebastiá, Miguel; Ruuth, Edvin; Stigsson, Lars; Galbe, Mats; Wallberg, Ola
Source:
Waste management 2021 v.121 pp. 248-254
ISSN:
0956-053X
Subject:
sulfuric acid,   etc   ; acid hydrolysis; environmental impact; fabrics; fermentation; glucose; industry;     Show all 7 Subjects
Abstract:
... The fashion industry has a considerable environmental impact, especially due to the increased generation of waste textiles as a result of fast fashion business models. Although fiber-to-fiber recycling processes are being developed, such a process is in reality a downcycling process, in which the mechanical properties of the textile fibers are impoverished with each cycle. Thus, new alternatives a ...
DOI:
10.1016/j.wasman.2020.12.024

6. Leaching of iron from copper tailings by sulfuric acid: behavior, kinetics and mechanism

Author:
Tao, Lei; Wang, Langlang; Yang, Kanghuai; Wang, Xueqian; Chen, Lu; Ning, Ping
Source:
RSC advances 2021 v.11 no.10 pp. 5741-5752
ISSN:
2046-2069
Subject:
sulfuric acid,   etc   ; calcium oxide; iron; liquids; solid wastes;     Show all 5 Subjects
Abstract:
... Copper tailing is a widespread and intractable solid waste in copper production. Traditional leaching and recovery technology for copper tailing focuses on copper but neglects the leaching of iron. With the increase in applications and demands of iron-containing materials for environment, understanding the leaching behaviors of iron can promote the utilization of copper tailings. In this study, th ...
DOI:
10.1039/d0ra08865j

7. Removal of Cl(-I) from strongly acidic wastewater containing Cu(II) by complexation-precipitation using thiourea: Efficiency enhancement by ascorbic acid

Author:
Guo, Panpan; Kong, Linghao; Hu, Xingyun; Peng, Xianjia; Wang, Xianliang
Source:
Journal of hazardous materials 2021 v.402 pp. 123836
ISSN:
0304-3894
Subject:
sulfuric acid,   etc   ; ascorbic acid; neutralization; solid wastes; thiourea; wastewater;     Show all 6 Subjects
Abstract:
... Strongly acidic wastewater produced by copper smelting industries contains high concentrations of Cl(-I), Cu(II) and H₂SO₄. The common method for the treatment of this type of wastewater is neutralization, which produces large amounts of solid waste. To avoid the production of solid waste, it was proposed to selectively remove contaminants and then recycle the wastewater as diluted sulfuric acid. ...
DOI:
10.1016/j.jhazmat.2020.123836

8. A comparative study of the removal of o-xylene from gas streams using mesoporous silicas and their silica supported sulfuric acids

Author:
Gao, Kaiyin; Ma, Mengze; Liu, Yuheng; Ma, Zichuan
Source:
Journal of hazardous materials 2021 v.409 pp. 124965
ISSN:
0304-3894
Subject:
sulfuric acid,   etc   ; adsorbents; adsorption; comparative study; desorption; porous media; silica gel; temperature; xylene;     Show all 9 Subjects
Abstract:
... The three types of silica supported sulfuric acids (SSA), with the same sulfuric acid loading of 9.25 mmol g⁻¹, were prepared by a wet impregnation method from silica gel (SG), SBA-15 and MCM-41. Characterization of the prepared SSA showed that two anchoring states coexisted for sulfuric acid supported on the surface of the silicas: A physiosorbed (P)-state sulfuric acid; and a chemically bonded ( ...
DOI:
10.1016/j.jhazmat.2020.124965

9. Bioleaching of Copper-Containing Electroplating Sludge

Author:
Sun, Jianxing; Zhou, Wenbo; Zhang, Lijuan; Cheng, Haina; Wang, Yuguang; Tang, Ruichang; Zhou, Hongbo
Source:
Journal of environmental management 2021 v.285 pp. 112133
ISSN:
0301-4797
Subject:
sulfuric acid,   etc   ; ; bioleaching; construction industry; copper; pollution; sludge; solid wastes; toxicity;     Show all 9 Subjects
Abstract:
... The recovery of precious metals from solid waste through bioleaching has become a research hotspot in recent years. Thus, in this study, different strategies, such as chemical sulfuric acid leaching and mixed consortium bioleaching, were adopted to extract copper from Copper-Containing Electroplating Sludge. The results showed that, compared to chemical leaching, bioleaching showed a much better p ...
DOI:
10.1016/j.jenvman.2021.112133

10. Enhancing anaerobic degradation of oily sludge using subcritical hydrothermal pretreatment

Author:
Su, H.; Lin, J.
Source:
Journal of applied microbiology 2021 v.130 no.5 pp. 1582-1591
ISSN:
1364-5072
Subject:
sulfuric acid,   etc   ; ammonia; anaerobic digestion; biodegradation; carbon; lipid content; microbiology; sludge; temperature;     Show all 9 Subjects
Abstract:
... AIMS: Oily sludge is a kind of mixture that is extremely harmful to the environment. Anaerobic digestion (AD) is a commonly used method for biodegrading oily sludge. However, the AD treatment cycle is usually long and inefficient. Here, we developed an approach to improve the degradation rate of oily sludge by integrating subcritical hydrothermal pretreatment (SHP) and AD. METHODS AND RESULTS: Fir ...
DOI:
10.1111/jam.14748

11. Vanadium recovery from steel converter slag utilised as an oxygen carrier in oxygen carrier aided combustion (OCAC)

Author:
Attah, Martin; Hildor, Fredrik; Yilmaz, Duygu; Leion, Henrik
Source:
Journal of cleaner production 2021 v.293 pp. 126159
ISSN:
0959-6526
Subject:
sulfuric acid,   etc   ; biomass; combustion; microwave treatment; oxygen; particle size; slags; steel; vanadium;     Show all 9 Subjects
Abstract:
... This study investigates vanadium extraction from steel converter slag from the LD (Linz-Donawitz) process. This slag has been used as an active bed material in a biomass boiler in a combustion technique called oxygen carrier aided combustion (OCAC). This usage in the boiler could be compared to the roasting step in the common roasting-leaching method for vanadium extraction. Leaching of LD slag pr ...
DOI:
10.1016/j.jclepro.2021.126159

12. The recovery of sulfuric acid from spent piranha solution over a dimensionally stable anode (DSA) Ti-RuO2 electrode

Author:
Carretero, Daniel Sanchez; Huang, Chih-pin; Tzeng, Jing-Hua; Huang, Chin-pao
Source:
Journal of hazardous materials 2021 v.406 pp. 124658
ISSN:
0304-3894
Subject:
sulfuric acid,   etc   ; anodes; electrochemistry; foil; hydrogen peroxide; models; oxidation; ruthenium; semiconductors; titanium;     Show all 10 Subjects
Abstract:
... Piranha solution is a highly acidic mixture of sulfuric acid and hydrogen peroxide. The present study aimed at developing a dimensionally stable anode (DSA), made of titanium metal foil coated with Ruthenium Dioxide (RuO₂), for the electrochemical oxidation of hydrogen peroxide in the presence of strong sulfuric acid under ambient conditions. Results showed that hydrogen peroxide in the piranha so ...
DOI:
10.1016/j.jhazmat.2020.124658

13. Extraction of lithium and aluminium from bauxite mine tailings by mixed acid treatment without roasting

Author:
Zhang, Yusong; Zhang, Jie; Wu, Lin; Tan, Lin; Xie, Fei; Cheng, Jiangguo
Source:
Journal of hazardous materials 2021 v.404 pp. 124044
ISSN:
0304-3894
Subject:
sulfuric acid,   etc   ; acid treatment; aluminum; bauxite; boehmite; energy; illite; kaolinite; lithium; phosphoric acid; temperature;     Show all 11 Subjects
Abstract:
... Bauxite mine tailings can be used as the reserve resources of aluminium and lithium. In this study, a less energy consumption treatment method for extracting aluminium and lithium from bauxite mine tailings has been proposed, which used mixed acid to leach aluminium and lithium from tailings directly, avoided roasting for reducing energy consumption, and obtained effective results.The minerals in ...
DOI:
10.1016/j.jhazmat.2020.124044

14. Selection of an appropriate acid type for the recovery of zinc from a flotation tailing by the analytic hierarchy process

Author:
Kursunoglu, Sait; Kursunoglu, Nilufer; Hussaini, Shokrullah; Kaya, Muammer
Source:
Journal of cleaner production 2021 v.283 pp. 124659
ISSN:
0959-6526
Subject:
sulfuric acid,   etc   ; citric acid; environmental impact; leaching; minerals; oxalic acid; zinc;     Show all 7 Subjects
Abstract:
... The selection of acid type for metal dissolution from minerals is an important issue in leaching operations. Acids are used to recover valuable elements from the minerals by dissolving them in a solution. The acid must offer a high recovery at marginal cost and a low environmental effect. Many parameters can affect the acid type selection for high leaching recovery and low environmental effect and ...
DOI:
10.1016/j.jclepro.2020.124659

15. Sulfuric acid modified expanded vermiculite cover for reducing ammonia emissions from animal slurry storage

Author:
Wang, Yue; Guo, He; Wang, Shunli; Zhang, Jianan; Zhu, Zhiping; Li, Xinrong; Dong, Hongmin
Source:
Journal of hazardous materials 2021 v.403 pp. 123954
ISSN:
0304-3894
Subject:
sulfuric acid,   etc   ; acidification; adsorption; air quality; ammonia; dairy manure; economic costs; slurries; vermiculite;     Show all 9 Subjects
Abstract:
... Animal slurry storage is an important source of NH₃ emission which has raised a high attention regarding its influence on air quality and environment health. There is an urgent need to develop an efficient, green and safe technology for reducing NH₃ emission. This study introduced a novel method of reducing NH₃ emission from dairy slurry storage using H₂SO₄ modified expanded vermiculite cover (H₂S ...
DOI:
10.1016/j.jhazmat.2020.123954

16. Production of mixed rare earth oxide powder from a thorium containing complex Bastnasite ore

Author:
Kursunoglu, Sait; Hussaini, Shokrullah; Top, Soner; Ichlas, Zela Tanlega; Gokcen, Hasan Serkan; Ozsarac, Safak; Kaya, Muammer
Source:
Powder technology 2021 v.379 pp. 641-654
ISSN:
0032-5910
Subject:
sulfuric acid,   etc   ; baking; exhibitions; leaching; oxalates; oxalic acid; rare earth elements; shape; thermal degradation; thorium; water;     Show all 11 Subjects
Abstract:
... The production of mixed rare earth oxide powder from a thorium containing bastnasite ore by sulfuric acid bake-water leaching followed by precipitation with oxalic acid and thermal decomposition of the oxalates was investigated. The sulfuric acid baking was performed at 250 °C and the optimum baking time was found to be 3 h. Using deionized water as lixiviant, 92.6% La, 86.8% Ce, 86.9% Pr, 82.3% N ...
DOI:
10.1016/j.powtec.2020.10.086

17. Mixing concentrated sulfuric acid and diethylenetriamine at room temperature: A rapid and facile approach to synthesize fluorescent carbon polymer hollow spheres as peroxidase mimics

Author:
Zhang, Haiyan; Liu, Sen
Source:
Journal of colloid and interface science 2021 v.582 pp. 405-411
ISSN:
0021-9797
Subject:
sulfuric acid,   etc   ; ambient temperature; carbon; colorimetry; fluorescence; hydrogen peroxide; mixing; nanomaterials; oxidation; peroxidase; polymerization; polymers; powders;     Show all 13 Subjects
Abstract:
... Fluorescent carbon polymer nanomaterials driven by their important various applications are promising, however, their scalable usages are still hindered by the lack of facile and effective synthesis approaches. Herein, a rapid and facile approach is demonstrated for the preparation of fluorescent carbon polymer hollow spheres (CPHSs), which were synthesized by directly mixing concentrated sulfuric ...
DOI:
10.1016/j.jcis.2020.08.048

18. Organocatalytic sulfoxidation

Author:
Davidson, Stuart C.; Gomes, Gabriel dos Passos; Kuhn, Leah R.; Alabugin, Igor V.; Kennedy, Alan R.; Tomkinson, Nicholas C.O.
Source:
Tetrahedron 2021 v.78 pp. 131784
ISSN:
0040-4020
Subject:
sulfuric acid,   etc   ; Lewis bases; catalytic activity; hydrogen peroxide; moieties; oxidants; oxygen; silica; stoichiometry; sulfides; sulfur;     Show all 11 Subjects
Abstract:
... Treatment of a sulfide with a catalytic amount of a 1,3-diketone in the presence of silica sulfuric acid as a co-catalyst and hydrogen peroxide (50% aq) as the stoichiometric oxidant leads to the corresponding sulfoxide product. The reaction is effective for diaryl, aryl-alkyl and dialkyl sulfides and is tolerant of oxidisable and acid sensitive functional groups. Investigations have shown that th ...
DOI:
10.1016/j.tet.2020.131784

19. Synthesis of anhydrite from red gypsum and acidic wastewater treatment

Author:
Chen, Qiuju; Ding, Wenjin; Sun, Hongjuan; Peng, Tongjiang
Source:
Journal of cleaner production 2021 v.278 pp. 124026
ISSN:
0959-6526
Subject:
sulfuric acid,   etc   ; anhydrite; calcium sulfate; gypsum; ions; iron; leaching; pH; temperature; wastewater treatment;     Show all 10 Subjects
Abstract:
... One-step process of red gypsum leaching to produce anhydrite was proposed. The effects of sulfuric acid concentration, reaction temperature and reaction time on both the leaching rate of red gypsum, the phase and micro-morphology of the product were systematically investigated. The acid leaching solution was tried to use circularly. And the valuable components in the leaching solution were recover ...
DOI:
10.1016/j.jclepro.2020.124026

20. Simultaneous formation of 3-(benzimidazol-2-yl)quinoxalin-2(1H)-ones and 2-(benzimidazol-2-yl)quinoxalines from quinoxalin-2(1H)-one-3-carbaldoximes when exposed to 1,2-benzenediamines

Author:
Mamedov, Vakhid A.; Zhukova, Nataliya A.; Syakaev, Victor V.; Gubaidullin, Aidar T.; Kadyrova, Milyausha S.; Beschastnova, Tat’yana N.; Rizvanov, Il′dar Kh.; Latypov, Shamil K.
Source:
Tetrahedron 2020 v.76 no.52 pp. 131721
ISSN:
0040-4020
Subject:
sulfuric acid,   etc   ; catalysts; quinoxalines; synthesis; yields;     Show all 5 Subjects
Abstract:
... Interaction of quinoxalin-2(1H)-one-3-carbaldoximes with 1,2-benzenediamine derivatives in AcOH or n-BuOH at reflux in the presence of sulfuric acid as catalyst was found to give 3-(benzimidazol-2-yl)quinoxalin-2(1H)-ones and 2-(benzimidazol-2-yl)quinoxalines in relatively good yields, which formed as a result of the Weidenhagen reaction and Mamedov rearrangement, respectively. The reaction in AcO ...
DOI:
10.1016/j.tet.2020.131721