Conversion mechanisms between organic sulfur and inorganic sulfur in surface sediments in coastal rivers

In this paper, the desulfurization of Fangshan coal was carried out by tetrachloroethylene extraction under ultrasonic and microwave irradiation. The GC-MS analysis of the tetrachloroethylene extraction reveals that organic sulfur in coal can be removed by tetrachloroethylene extract under ultrasonic and microwave irradiation. It is found that microwave irradiation time has great effect on organic sulfur removal. With the microwave irradiation time increases, the efficiency of organic sulfur removal increases. The desulphurization yield reaches maximum, 45%, when the time is 30 minutes or more. It can be clearly seen that Fangshan coal was oxidated by peroxyacetic acid under ultrasonic and microwave irradiation. From the XPS analysis of the macerals of the coal, most of the inorganic sulfur and organic sulfur are removed, especially thioether and thioalcohol which can be completely removed. These results suggest that microwave is an effective way to remove sulfur in coal.

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Desulfurization Effect of High-Sulfur Weibei Coal of Assisted by Microwave Irradiation and Ultrasonic Wave

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1070-1072.501 ◽

2014 ◽

Vol 1070-1072 ◽

pp. 501-504 ◽

Cited By ~ 2

Author(s):

Zhi Yuan Yang ◽

Si Tong Wang ◽

Chao Tan ◽

Yan Hong Li

Keyword(s):

Ultrasonic Wave ◽

Coal Ash ◽

Organic Sulfur ◽

Coal Slurry ◽

Xps Spectra ◽

Inorganic Sulfur ◽

Ultrasonic Time ◽

Desulfurization Process ◽

Microwave Time ◽

Fractional Release

The desulfurization process of high-sulfur coal in Weibei was studied by flotation pretreatment and microwave combined with ultrasonic wave and oxidants. Through the single factor experiment which took Chenghe coal as the sample, the optimum conditions of this process had been concluded as follows: microwave power was 250 W, microwave time was 15 min, ultrasonic temperature was 60 °C, ultrasonic time was 30 min, coal slurry concentration was 0.083 g/ml, coal particle size was less than 0.074 mm, the dosage of agents was 8 mL/g, the radio of acetic acid and hydrogen peroxide was 1:3. After fractional release pretreatment, the sulfur reduction of Chenghe coal could reached to 53.10%. As to Hancheng coal, the value was 46.41%. By analyzing XRD and XPS spectra, it showed that most inorganic sulfur were removed by flotation pretreatment, and under the function of microwave combined with ultrasonic wave and oxidants, a part of organic sulfur was removed, such as mercaptan, sulfoxide and thiophene. However, as for sulfone, the removal effect was not obvious. The results proved that the experimental method could remove most of inorganic sulfur and part of the organic sulfur and significantly reduce the coal ash.

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Transformation of Inorganic Sulfur into Organic Sulfur: A Novel Photoluminescent 3-D Polymeric Complex Involving Ligands in Situ Formation

Inorganic Chemistry ◽

10.1021/ic0484856 ◽

2005 ◽

Vol 44 (5) ◽

pp. 1175-1177 ◽

Cited By ~ 52

Author(s):

Dan Li ◽

Tao Wu

Keyword(s):

Organic Sulfur ◽

Polymeric Complex ◽

Inorganic Sulfur ◽

In Situ Formation

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Coupling mechanisms of S–Fe–P in surface sediments under the stresses of high salinity and heavy metals in coastal rivers

Journal of Soils and Sediments ◽

10.1007/s11368-021-02948-5 ◽

2021 ◽

Author(s):

Ming Jiang ◽

Yanqing Sheng ◽

Guoqiang Zhao ◽

Wenjing Wang

Keyword(s):

Heavy Metals ◽

Surface Sediments ◽

High Salinity ◽

Coastal Rivers ◽

Coupling Mechanisms

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POST-COMBUSTION COAL DESULFURIZATION Review

Eksergi ◽

10.31315/e.v17i2.3828 ◽

2020 ◽

Vol 17 (2) ◽

pp. 79

Author(s):

Silky Amanda Yuniar ◽

Edy Nursanto ◽

Rika Ernawati

Keyword(s):

Sulfur Content ◽

Coal Combustion ◽

Sulfur Oxidation ◽

Organic Sulfur ◽

Inorganic Sulfur ◽

Coal Desulfurization ◽

Burning Coal ◽

Cleaning Technology ◽

Sulfur In Coal ◽

So2 Gas

The sulfur content in coal ranges from 0.5 to 5%, and it is an impurity that must be removed before burning coal, due to the toxic effects and acid rain caused by SO2 gas generated from sulfur oxidation. Sulfur cleaning technology can be carried out on coal before combustion (pre-combustion), and can reduce the inorganic sulfur content by up to 50%; however, it cannot reduce the organic sulfur content. Therefore, the industry relies on post-combustion desulfurization to remove SO2 from the gas from coal combustion. The aim of the coal desulfurization review is to direct desulfurization research to be efficient and effective, as well as to be environmentally friendly. Sulfur in coal consists of organic sulfur and inorganic sulfur. Coal inorganic sulfur consists of pyrite (FeS2), sulfate, and sulfide. The largest composition is pyrite. Organic sulfur consists of hetero-atomic and heterocyclic (thiophenic) macromolecules that bind N and O atoms, aromatic sulfides, and aromatic disulfides (small amounts). Inorganic sulfur can easily be separated from coal by means of flotation, microwave energy, magnetic forces, ultrasonic energy, and as well as microorganisms. Meanwhile, organic sulfur cannot be separated from coal by using the methods used in the inorganic sulfur separation process. Organic sulfur can be removed by chemical and biodesulfurization, however, this process is inefficient for industrial scale. The most recommended method is the absorption of SO2 gas in the gas from coal combustion, or post-combustion desulfurization. Various methods have also been investigated to separate SO2 gas, and more details will be described in this paper.

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Anthropogenic impacts on reduced inorganic sulfur and heavy metals in coastal surface sediments, north Yellow Sea

Environmental Earth Sciences ◽

10.1007/s12665-012-1835-4 ◽

2012 ◽

Vol 68 (5) ◽

pp. 1367-1374 ◽

Cited By ~ 13

Author(s):

Yanqing Sheng ◽

Qiyao Sun ◽

Simon H. Bottrell ◽

Robert J. G. Mortimer ◽

Wenjing Shi

Keyword(s):

Heavy Metals ◽

Yellow Sea ◽

Surface Sediments ◽

Anthropogenic Impacts ◽

Inorganic Sulfur ◽

North Yellow Sea

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Sulfur constituents and transformations in upland and floodplain forest soils

Canadian Journal of Forest Research ◽

10.1139/x88-170 ◽

1988 ◽

Vol 18 (9) ◽

pp. 1106-1112 ◽

Cited By ~ 15

Author(s):

Loretta M. Bartel-Ortiz ◽

Mark B. David

Keyword(s):

Forest Soils ◽

Soil Profile ◽

Dry Mass ◽

Organic Sulfur ◽

Total Sulfur ◽

Flood Events ◽

Floodplain Soil ◽

Inorganic Sulfur ◽

Low Levels ◽

Soil And Water

Forest soils at an upland site (Typic Hapludalfs) and a floodplain site (Cumulic Haplaquolls) were sampled seasonally to examine organic and inorganic sulfur constituents at four depths (0–10, 10–30, 30–60, and 60–103 cm). At both sites, organic sulfur (carbon-bonded and ester sulfate) was >90% of total sulfur concentrations. Low levels of extractable sulfate (<12 μg•g−1 dry mass of soil) were found at all sites and depths. The floodplain soil contained higher sulfur levels (except sulfate) than the upland site (3072 and 1353 kg total S•ha−1, respectively). Sulfur constituents (except sulfate) decreased with depth in the soil profile at both sites. At both sites soils had little capacity to adsorb sulfate at current solution concentrations. In addition to the field study, a laboratory experiment was designed to examine simulated flooding (over 28 days), using bottomland soil and water from the Sangamon River, Illinois. The field and artificial flooding results suggested little reduction of sulfate in the floodplain soil (nonsulfate inorganic sulfur concentrations of <1% of total sulfur). Large sulfur pools in the bottomland soil are thought to be deposited by sedimentation of organic materials during flood events. Sulfate in soils from both sites appears to be rapidly incorporated into organic sulfur and is not readily adsorbed.

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