FUEL
·
2019
·
IF 5.128
Jianyi Lu,Zhiyong Zhou,Hanzhi Zhang,Zhe Yang
SO 3 generated in coal-fired boiler and selective catalytic reduction (SCR) process has become a significant problem due to its adverse effects on boiler facilities and air environment. The factors influenced conversion rate of SO 2 to SO 3 (SO 2 /SO 3 ) during SCR process were studied and evaluated, which included the effects of flue gas composition and SCR catalyst components on the conversion of SO 2 /SO 3 . SO 3 was trapped by the condensation and isopropanol absorption method, and SO 4 2− concentration was detected by spectrophotometer. The results showed that a certain concentration of NH 3 in the flue gas significantly promoted the conversion rate, but when NH 3 and NO coexisted, NO inhibited the catalytic action of NH 3 , while NO itself and O 2 had small effect on the conversion rate. Besides, the conversion rate of SO 2 increased with the increase of Ti and V content in the catalyst, and SiO 2 and BaO abated the catalytic oxidation of SO 2 , while WO 3 promoted the formation of SO 3 .
研究领域:
环境工程
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化学工程
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能源技术
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空气污染控制
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jie Zhao,Fei Wu,Qiang He,Yawei Feng
Construction of Bi 2 FeNbO 7 /bisulfite system for abatement of pharmaceutical residue was achieved. An attempt to synthesize Bi 2 FeNbO 7 through hydrothermal technique was confirmed by X-ray diffraction. The magnetic field experiment revealed that Bi 2 FeNbO 7 possessed a saturation magnetization of 6.99 emu/g, indicating magnetic attributes of Bi 2 FeNbO 7 . Scanning electron microscopy images showed that Bi 2 FeNbO 7 exhibited regular octahedra in the size of 200–300 nm. In a self-made device, the activation of sodium bisulfite using Bi 2 FeNbO 7 for the disposal of amiloride has been carefully explored. The effects of solution pH, sodium bisulfite concentration, Bi 2 FeNbO 7 dosage, amiloride concentration, coexisting ions, and water matrix on the performance of Bi 2 FeNbO 7 /bisulfite system was investigated. The catalytic performance of Bi 2 FeNbO 7 /bisulfite to degrade amiloride was considerably higher than that of traditional iron oxides . The maximum removal efficiency of amiloride was 97.9% in Bi 2 FeNbO 7 /bisulfite process. The involvement of Fe might be crucial for activating bisulfite to create active species. The dominating radical in Bi 2 FeNbO 7 /bisulfite process was identified as SO 3 •‒ . With the help of UHPLC/MS/MS, three new degradation products of amiloride were found. Dehalogenation and deamination of amiloride might account for the formation of these transformation products . This work provides a highly efficient Bi 2 FeNbO 7 /bisulfite process for the disposal of pharmaceutical pollutants in water treatment .
研究领域:
环境科学
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材料科学
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水处理技术
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Zequn Yang,Hailong Li,Wenqi Qu,Mingguang Zhang,Yong Feng,Jiexia Zhao,Jianping Yang,Kaimin Shih
Mineral sulfide based sorbents were superior alternatives to traditional activated carbons for elemental mercury (Hg0) immobilization in industrial flue gas. A systematical study concerning the influence of sulfur trioxide (SO3) on Hg0 adsorption over a nanosized copper sulfide (Nano-CuS) was for the first time conducted. SO3 was found to significantly inhibit the Hg0 removal over Nano-CuS partially because SO3 oxidized the reduced sulfur species (sulfide) with high affinity to mercury to its oxidized sulfur species (sulfate). Moreover, a brand new “oxidation-reduction” mechanism that led to a simultaneous oxidation of sulfide and reduction of mercury on the immobilized mercury sulfide (HgS) was responsible for the inhibitory effect. Even though the released Hg0 from the reduction of mercury in HgS could be oxidized by SO3 into its sulfate form (HgSO4) and recaptured by the sorbent, the “oxidation-reduction” mechanism still compromised the Hg0 capture performance of the Nano-CuS because HgSO4 deposited on the sorbent surface could be easily leached out when environmentally exposed. These new insights into the role of SO3 in Hg0 capture over Nano-CuS can help to determine possible solutions and facilitate the application of mineral sulfide sorbents as outstanding alternatives to activated carbons for Hg0 immobilization in industrial flue gas.
研究领域:
环境科学
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化学工程
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污染控制
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汞去除
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气相吸附
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DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 35
·18486-18493
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IF 8.867
Fei Wang,Gang Guo,Sheng-Jun Luo,Rong-Bo Guo
Sodium dodecyl sulfate (SDS) has been reported to be the most efficient promoter for hydrate-based natural gas storage and transportation, however, foam generation during hydrate dissociation seriously affects its application. Nano-metal particles have also been demonstrated to be efficient promoters, nevertheless their poor stability is a serious problem. In this work, we first fixed –SO3− groups (similar to the hydrophilic group of SDS) covalently on polystyrene through soap-free emulsion polymerization to synthesize –SO3−-coated nanopolymers, and by tuning their morphology they existed as amorphous polystyrene macromolecules (–SO3−@PSMM) or uniform polystyrene nanospheres (–SO3−@PSNS). Afterwards, we grafted nano-Ag particles with the size of 2–5 nm on the –SO3−-coated nanopolymers through electrostatic adsorption and in situ reduction to prepare Ag&–SO3−-coated nanopolymers (denoted as Ag&–SO3−@PSMM and Ag&–SO3−@PSNS), which were then used for the first time to promote methane hydrate formation. When 0.5 mmol L−1 amorphous Ag&–SO3−@PSMM was used at an initial pressure of 6 MPa and temperature of 275.15 K, the induction period was 32.2 ± 7.9–60.8 ± 14.2 min, the growth period was 108.8 ± 8.2–177.1 ± 38.9 min and the methane storage capacity reached 143.9 ± 3.7–145.2 ± 1.2 v/v, whereas when the spherical Ag&–SO3−@PSNS was used at 0.5 mmol L−1, the induction period and growth period were 17.8 ± 2.8–38.5 ± 8.0 and 39.6 ± 2.8–42.1 ± 0.9 min, respectively; and the storage capacity reached 149.3 ± 1.2–151.3 ± 3.0 v/v, indicating that Ag&–SO3−@PSNS were much better promoters compared with Ag&–SO3−@PSMM. Moreover, Ag&–SO3−@PSNS exhibited excellent recycling performance for 10 cycles of methane hydrate formation–dissociation. To sum up, the Ag&–SO3−-coated nano-promoters developed in this work showed significant potential in achieving the industrial application of hydrate-based natural gas storage and transportation.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Quantao Cui,Yuyin Dong,Weiwei Zou,Ziyu Song,Wei Zhang,Qiting Zuo,Xiaoli Zhao,Fengchang Wu
Sulfite-based advanced oxidation technology has received considerable attention for its application in organic pollutants elimination. However, the potential of natural sediments as effective catalysts for sulfite activation has been overlooked. This study investigates a novel process utilizing suspended sediment/sulfite (SS/S(IV)) for degradation of metronidazole (MNZ). Our results demonstrate that MNZ degradation efficiency can reach to 93.1 % within 90 min with 12.0 g SS and 2.0 mM sulfite. The influencing environmental factors, including initial pH, SS dosage, S(IV) concentration, temperature, and co-existing substances were systematically investigated. Quenching experiments and electron paramagnetic resonance analyses results indicate that SO 3 •− is the primary active substance responsible for MNZ degradation, with involvement of SO 4 •− , SO 5 •− , and • OH. X-ray photoelectron spectroscopy and Mössbauer spectra reveal that Fe (III)-silicates play a crucial role in activating S(IV). Furthermore, analysis of degradation intermediates and pathways of MNZ is conducted using liquid chromatography with mass spectrometry (LC -MS). The toxicity of MNZ and its intermediates were also systematically evaluated by the T.E.ST. program and wheat seeds germination test. This study offers valuable insight into the activation of sulfite by natural sediments and could contribute to the development of SS-based advanced oxidation processes (AOPs) for the in-situ remediation of antibiotics-contaminated water environments.
研究领域:
环境科学
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水处理
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污染物降解
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催化
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2025
·
IF 4.9
Long-Gen Hu,Guo-Sheng Zhang,Guang-Hui Shi,Jian-Guo Qian,Hai-Jing Wang,Ye Liu
The Pd-catalyzed aminocarbonylation as well as hydroxycarbonylation of terminal alkynes was achieved with aid of a sulfonate-built-in zwitterionic phosphine ( L2 ), under acid-additive free condition. With L2 -Pd(OAc) 2 catalytic system, the terminal alkynes smoothly converted to the corresponding α,β -unsaturated carbonyl compounds (amides or carboxylic acids) in moderate to excellent isolated yields, with 100 % branched regio-selectivity. It was believed that L2 with the matched steric-demand and the bulit-in-SO 3 - -unit not only tuned the catalytic performance of Pd(OAc) 2 to activate CO and alkyne but also exhibited the synergetic activating ability towards the nucleophiles of (primary/secondary) amines or H 2 O via developing hydrogen-bond interaction, which facilitated the observed successful carbonylation. It means the developed L2 -Pd(OAc) 2 system could serve as a bifunctional catalyst.
研究领域:
有机化学
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催化化学
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配位化学
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合成化学
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物理有机化学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2021
·
IF 2.328
Xinyu Ai,Leipeng Li,Xue Zhou,Zhiguo Zhang
For understanding the SO 3 emission level in coal-fired power plants to indicate the operating status of the SCR, a sulfate monitoring method based on ultraviolet absorption spectroscopy was proposed to feedback SO 3 concentration. By measuring the absorption spectrum of sulfate, the red shift of the absorption peak was observed when the concentration was higher than 0.01 mol/L. Through optimization, a spectral range for sensitive detection of sulfate was obtained. A quadratic function was given for fitting the relationship between sulfate concentration and ultraviolet absorption. The minimum detection limit of sulfate was determined to be 9 × 10 -5 mol/L.
研究领域:
环境监测
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电厂排放
·
光谱分析
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Changhui Zhou,Jinhua Li,Yan Zhang,Jing Bai,Pengbo Wang,Bo Zhang,Lina Zha,Mingce Long,Baoxue Zhou
Sulfurous and nitrogenous oxides, including NO x and SO 2 , and the generated substances NO x - and SO 3 2- widely exist in air and water as pollutants and thus are difficult to control in the environment. In this study, we designed a novel photoelectrocatalytic (PEC) system for the efficient conversion of SO 2 and NO x in mixed gases and NO x - and SO 3 2- in wastewater to N 2 and SO 4 2- , respectively, by activating SO 3 2- to form SO 3 • - . The key ideas include the conversion of SO 3 2- from SO 2 and efficient activation of SO 3 2- into SO 3 • - and further conversion into SO 4 • - by the MoS 2 /Fe 2 O 3 photoanode. Simultaneously, NO 3 - /NO 2 - originating from NO x was rapidly reduced to NH 4 + on the CuNW@CF cathode. Ultimately, the generated NH 4 + was selectively oxidized to N 2 by SO 4 • - and SO 4 • - was reduced to SO 4 2- . The results indicated that 99.9 % of TN was removed and 100 % of SO 3 2- was converted to harmless SO 4 2- . This study provides new insights into the treatment of sulfurous and nitrogenous oxides in air and water.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）