FUEL
·
2014
·
IF 3.406
Mingyang Sun,Zimo Lou,Guanghuan Cheng,Shams Ali Baig,Li Fang,Xiaoxin Zhou,Yixia Shen,Xinhua Xu
Wet flue gas desulfurization (WFGD) system has been increasingly recognized to be effective in Hg removal. But the generated secondary pollution due to Hg re-emission from desulfurization solutions or solid byproducts has received researchers’ attention. In this paper, the distribution of captured Hg 2+ (L) in the simulated WFGD slurry was studied as a function of various environmental factors. Experimental results indicated that the pH value had a strong effect on Hg 2+ reduction but had negligible influence on the Hg 2+ retention by the grained fraction of gypsum. Increasing in pH value resulted in higher Hg 2+ reduction and over 46% of Hg 2+ was found to be reduced into Hg 0 at pH 5.0. Besides, increased slurry temperature also promoted the Hg 2+ reduction and Hg 0 re-emission as well as the Hg 2+ retention efficiency by gypsum. Other factors including S (IV), Cl − and NO 3 − concentration was found to inhibit Hg 2+ transformation into Hg 0 but slightly promoted the Hg 2+ retained in gypsum. Moreover, the addition of sodium sulfide (Na 2 S), 2,4,6-trimercaptotiazine, trisodium salt nonahydrate (TMT), and sodium dithiocarbamate (DTCR) prevented the Hg 2+ reduction and precipitated out as insoluble HgS, Hg 3 (TMT) 2 and Hg(DTCR) 2 on gypsum. The findings presented in this study could provide theoretical basis for Hg removal in coal-fired power plants.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Hao Wu,Hen Chen,Qianwen Wang,Hongmin Yang
In this paper, the mercury re-emission from desulfurization slurry and mercury distribution in gas-liquid-solid three-phase at different desulfurization slurry parameters were studied. Besides, the inhibition performance of Fenton reagent for mercury re-emission and distribution was also investigated. The results show that the Hg 0 would re-emit from desulfurization slurry, and the proportions of mercury in gas-liquid-solid three-phase were about 12.17%, 77.72% and 12.08% at typical desulfurization slurry parameter. The S(IV) concentration (sulfite and/or bisulfite concentration), temperature and pH value of desulfurization slurry had great impacts on mercury re-emission and distribution. The increase of S(IV) concentration weakened the mercury re-emission, increased the proportions of mercury in solid phase and liquid phase. The increase of slurry temperature could intensify the mercury re-emission, increase the proportion of mercury in solid phase, but decrease the proportion of mercury in liquid phase. Higher pH value was favorable for the weakening of mercury re-emission, but would increase the proportion of mercury in solid phase and liquid phase. Moreover, the introduction of Fenton reagent into desulfurization slurry could inhibit the mercury re-emission and some mercury that should be re-emitted before would be restrained in solid phase, leading a slight increase of proportion of mercury in solid phase. The existing of oxygenated free radicals , which were generated from Fenton reagent, was the main reason for the inhibition of mercury re-emission. The increase of Fe 2+ and H 2 O 2 concentration was conducive to the promotion of inhibition performance, but the effect gradually to weaken. The appropriate value of Fe 2+ concentration was 0.04 mM with the H 2 O 2 concentration of 0.30 mM in experiments. In addition, the better inhibition performance (about 80%) of Fenton reagent for mercury re-emission would be realized at lower S(IV) concentration (1–5 mM), lower temperature (30–40 °C) and lower pH value (4.0–5.0) of slurry.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2013
·
IF 3.258
Ruikun Wang,Jianzhong Liu,Yujie Yu,Junhu Zhou,Kefa Cen
Urbanization has generated large volumes of municipal wastewater sludge (sludge for short) that threaten the environment and human health. As such, utilization of the sludge in a cost-effective manner is an important concern. The sludge, as a carbon-containing material, can be made into coal-sludge slurry (CSS) by mixing it with pulverized coal. However, the slurryability of the raw sludge is relatively poor due to the abundance of hydrophilic groups in the sludge and its loose floc structure. In this study, modification of the sludge with calcium oxide (CaO) showed positive effects on the sludge slurryability. The characteristic viscosity of the coal raw-sludge slurry (R-CSS) was 1635.3 mPa s. After modification of the sludge with 2 wt.% CaO for 24 h, the CSS viscosity decreased to 1184.4 mPa s. The hydrophobic group (C C and C H) content of the sludge increased from 61.5% to 74.9% as the CaO dosage increased from 0% to 4%, and the zeta potential increased from –55.1 eV to –36.2 eV. The optimum CaO dosage for improved slurryability was found to be 2 wt.%. Compared with R-CSS, the coal modified-sludge slurry (M-CSS) showed lower yield stress, weaker pseudoplastic and thixotropic behaviors, and poorer static stability.
研究领域:
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Wenbo Jia,Chuanmin Chen,Songtao Liu,Yue Cao
In this study, the Hg0 removal characteristics of NaClO2 in limestone slurry were investigated in a bubbling reactor. The effects of slurry conditions (pH, temperature, and Cl– concentration) and flue gas components (NO, SO2, HCl, etc.) on Hg0 removal activity and efficient Hg0 removal duration were explored. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the solid products prepared under different conditions. It was found that NaClO2 exhibited superior Hg0 removal activity when both SO2 and NO were present in the flue gas, while the Hg0 removal efficiency reduced significantly in the absence of SO2 and/or NO. The Hg0 removal activity of NaClO2 decreased significantly with the increase of pH value. The slurry temperature had no obvious effect on Hg0 removal activity, while higher temperature could enhance the Hg0 re-emission at a later stage. However, the presence of Cl– in limestone slurry could notably inhibit the Hg0 re-emission. The characterization results showed that the presence of SO2 and NO promoted the formation of HgCl2, Hg(NO3)2, and HgSO4, thus significantly enhancing the Hg0 removal activity of NaClO2 in limestone slurry.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Mengxi Zhao,Changjun Zou
In the process of flue gas desulfurization, the dissolution of limestone is an important reaction control step. In this study, we try to improve the dispersion and solubility of desulfurizer based on introducing hydrophilic material to prompt desulfurization efficiency. Firstly, hydrophilic β-cyclodextrin was introduced onto the surface of CaCO 3 nanoparticles to improve the dispersion of nanoparticles. The same concentration of limestone slurry, CaCO 3 nanofluids and modified CaCO 3 nanofluids were prepared. The stability experiments indicated that the dispersion of modified CaCO 3 nanofluid was much better than limestone slurry and CaCO 3 nanofluids because of hydrophilic groups. Acid titration experiments indicated that the conversion rate of the modified CaCO 3 nanofluid could reach 99.2%. Combined with the theory of shrinking core model, the dissolution rate of modified CaCO 3 nanofluid was 0.0103 s −1 , which was 73.14% higher than that of limestone slurry. The desulfurization experiments indicated that the desulfurization effect of high concentration CaCO 3 nanofluid was no longer obvious because of the agglomeration of nanoparticles, while the desulfurization effect of modified CaCO 3 nanofluid was much better than that of limestone slurry and CaCO 3 nanofluid. The maximum saturated sulfur capacity and desulfurization rate of 7 wt% modified CaCO 3 nanofluids were 81.38 mg/mL and 98.23%.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULAR PHARMACEUTICS
·
2022
·
IF 5.364
Ying Chen,Xiaoming Liao,Pei Jing,Liangkui Hu,Zengqiu Yang,Yongchao Yao,Chunyan Liao,Shiyong Zhang
As the most common subtype in ovarian malignancies, high-grade serous ovarian cancer (HGSOC) made less therapeutic progress in past decades due to the lack of effective drug-able targets. Herein, an effective linoleic acid (LA) and glucosamine (GlcN) hybrid (LA–GlcN) was synthesized for the treatment of HGSOC. The GlcN was introduced to recognize the glucose transporter 1 (GLUT 1) overexpressed in tumor cells to enhance the uptake of LA–GlcN, and the unsaturated LA was employed to trigger ferroptosis by iron-dependent lipid peroxidation. Since the iron content of HGSOC was ∼5 and 2 times, respectively, higher than that of the normal ovarian cells and low-grade serous ovarian cancer cells, these excess irons make them a good target to enhance the ferroptosis of LA–GlcN. The in vitro study demonstrated that LA–GlcN could selectively kill HGSOC cells without affecting normal cells; the in vivo study revealed that LA–GlcN at the dose of 50 mg kg–1 achieved a comparable tumor inhibition as doxorubicin hydrochloride (4 mg kg–1) while the overall survival of mice was extended largely due to the low toxicity, and when the dose was increased to 100 mg kg–1, the therapeutic outcomes could be improved further. This dietary hybrid which targets the excess endogenous iron to activate ferroptosis represents a promising drug for HGSOC treatment.
研究领域:
肿瘤学
·
药物化学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Xiongwei Tian,Qiyu Weng,Tao Lyu,Shujuan Wang,Huiqing Wang,XuSheng Wu,Yuqun Zhuo
Selenium (Se) is one of the hazardous trace elements emitted from coal-fired power plants. The Se migration behavior in wet flue gas desulfurization (FGD) slurry is still unclear, and the species of Se in FGD gypsum remains controversial. In this research, the bubbling experiments using simulated slurry with/without gypsum crystallization process were conducted. The experimental results indicated that pure gypsum has poor capability to capture Se components, and only selenite could be trapped in gypsum during its crystal growth stage. Furthermore, the DFT calculation was conducted to provide the microscopic information of Se adsorption and substitution characteristics during gypsum crystallization process. The research findings of this study could help understand the mechanism of Se migration process in FGD slurry, and facilitate the development of effective Se emission control technologies in the future.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Xin Chen,Chengwen Wang,Yanji Wang,Huan Wang,Ruihe Wang
Traditional thermoresponsive polymers with amphiphilicity exhibit acute thermo-thickening behaviors through phase transition and cannot be used as stabilizer to prevent high-viscosity liquid from viscosity reduction versus increasing temperature. Therefore, this study aims to develop a water-soluble polymer that has both thickening ability and continuous thermo-thickening ability in a wide temperature range. Inspired by the researches about hydrophobically associating polymers, a novel thermo-thickening polymer with strong hydrophobicity (HTP) has been synthesized, which consists of acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and a hydrophobic monomer with surfactant character (SHM). HTP has good thermal stability and moderate resistance to the salt and alkali. In particular, HTP exhibits a continuous thermo-thickening behavior from 48 to 148 °C and can mitigate the consistency reduction of cement slurry under high temperatures. A series of experimental results (including environmental scanning electron microscope, gel permeation chromatography, differential scanning calorimeter, and pyrene fluorescence probe) indicate that the microstructure changes of HTP molecules in solution determine the thickening and thermo-thickening behaviors of HTP. The thickening behavior of HTP is due to the generation of spatial molecular networks in solution. The formed networks become more tangled and larger along with increasing HTP concentration resulting in a higher viscosity of solution. Under higher temperature, the tangled HTP molecular chains may stretch and fabricate much larger and denser networks causing the thermo-thickening behavior of HTP. It is hoped that the thermo-thickening polymer presented in this paper can be applied in various fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Manufacturing Processes
·
2023
·
IF 6.2
Xiangxiang Cui,Zhenyu Zhang,Jianjun Yang,Zheng Ren,Hongxiu Zhou,Chunjing Shi,Fanning Meng,Junyuan Feng,Shuming Zhao
Due to the soft-brittle, deliquescent, and temperature-sensitive nature, potassium dihydrogen phosphate (KDP) has become one of the most difficult-to-process materials. Nonetheless, high-performance devices strictly require the surface roughness of KDP less than 1 nm, which is a great challenge for the ultraprecision machining field. To overcome this challenge, four kinds of green slurries were developed. For instance, ceria and graphene oxide were selected as abrasives, sodium carboxymethylcellulose was used as thickener, fatty alcohol-polyoxyethylene ether was employed as emulgator, sodium carbonate was proposed as a pH regulator, and tiny water was applied to dissolving agent. Four kinds of various base solutions, such as corn oil, glycol, polyethylene glycol and glycerol, form four varieties of green slurries for the chemical mechanical polishing (CMP) of KDP. After CMP, the surface roughness Sa is 0.562 nm with a scanning area of 50 × 50 μm 2 , using the glycol slurry. Until now, to the best of our knowledge, this is the lowest surface roughness at a such large measurement area. X-ray photoelectron spectroscopy and infrared Fourier transformation confirm that C P bonds were generated between graphene oxide and KDP, resulting in the breaking away of H 2 PO 4 − from KDP. A soft layer was produced by the tiny water. CO 3 2− reacts with H 2 PO 4 − , forming CO 2 gas and protecting the concave area on the surface of KDP. The soft layer was removed by the synergistic effect among abrasives, thickener and a polishing pad. The developed green slurries suggest new insights to achieve sub-nanometer surfaces on KDP with uniquely physical nature, for the potential use in laser systems.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Wenbo Jia,Chuanmin Chen,Songtao Liu
The mercury re-emission characteristics and inhibition effect of sodium dithiocarbamate (DTCR) on mercury re-emission in a simulated desulfurization slurry were investigated. The effects of the desulfurization slurry parameters (including slurry temperature, initial pH value, O2 concentration, and Cl– concentration) on mercury re-emission with and without DTCR were explored. Moreover, the kinetic parameters (reaction order, reaction rate constant, and apparent activation energy) of mercury re-emission and inhibition were calculated by the experimental data. The results showed that addition of DTCR could effectively reduce the mercury re-emission from the desulfurization slurry. The mercury re-emission was enhanced with increases of the slurry temperature and initial pH, while O2 and Cl– in the slurry could inhibit the mercury re-emission. Further study shows that the mercury re-emission reaction processes in the desulfurization slurry with and without DTCR are both consistent with the pseudo-first-order kinetics. In the absence of DTCR, the reaction rate constant of mercury re-emission is 0.01888 min–1, and the apparent activation energy is 44.59 kJ/mol. In the presence of 0.002% DTCR, the reaction rate constant of mercury re-emission is 0.01126 min–1 and the apparent activation energy is 49.08 kJ/mol. Moreover, the effects of slurry parameters on the reaction rate constant were also explored. The present findings are valuable for coal-fired power plants to control mercury re-emission from a desulfurization slurry.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH
·
2024
·
IF 4.6
Jiazhen Huang,Ying Tang,Yibing Li,Wei Wei,Fuli Kang,Shuang Tan,Lin Lin,Xiaohang Lu,Heng Wei,Ning Wang
High-grade serous ovarian cancer (HGSOC) is the most aggressive type of ovarian cancer that causes great threats to women's health. Therefore, we performed RNA-sequencing technology in clinical samples to explore the molecular mechanisms underlying the progression of HGSOC. We then noticed BBOX1, a kind of 2-oxoglutarate-dependent enzyme that is highly expressed in HGSOC tumor tissues. Functional studies showed that BBOX1 promotes cell survival and growth of HGSOC cells in vitro and in vivo. Overexpression of the wild-type BBOX1 promoted cell proliferation, but the Asn191 and Asn292 mutation (key amino acid for the enzymatic activity of BBOX1) counteracted this effect ( P < 0.05), which indicated that the promotion effect of BBOX1 on HGSOC cell proliferation was related to its catalytic activity. Downregulation of BBOX1 reduced the activity of the mTORC1 pathway, and decreased protein expression of IP3R3 and phosphorylation level of S6K Thr389 . Metabolomics analysis revealed that BBOX1 is implicated in the glucose metabolism, amino acid metabolism, and nucleotide metabolism of HGSOC cells. In addition, inhibition of BBOX1 suppressed HGSOC cell glycolysis and decreased glucose consumption, lactate production, and the expression of key factors in glycolysis. Finally, we found hypoxia induced the expression of BBOX1 in HGSOC cells and confirmed that BBOX1 could be transcriptionally activated by hypoxia-inducible factor-1α, which could directly bind to the BBOX1 promoter. In summary, BBOX1 mediated the metabolic reprogramming driven by hypoxia, and affected cell metabolism through the mTORC1 pathway, thus acting as an oncogene during HGSOC development.
研究领域:
肿瘤学
·
分子生物学
·
细胞生物学
·
代谢学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Chunjing Shi,Zhenyu Zhang,Leilei Chen,Qiyuan Li,Hongxiu Zhou,Shenghua He,Jie Liu,Qingxiong Wang,Shiqiang Yu
Photochemical mechanical polishing (PCMP) exhibits excellent photochemical properties for polishing diverse materials from alloys to resins and quartz. However, comprehensive research on large atomic surfaces, slurry reusing, and post-treatments is rare and challenging. Thus, we have designed Prussian blue and cerium oxide (PB-CeO 2 ) composites and subsequently developed reusable, neutral, and environmentally friendly PCMP slurries. Enhanced with photocatalysis, the developed slurries can own more active species, which not only boost CMP efficiency but also eliminate the need for pH regulators that might cause excessive etching. The slurry only consists of water, composite abrasives, sodium carboxymethylcellulose and hydrogen peroxide, without any other additives. Atomic surfaces of fused silica are achieved with surface roughness of 0.113 nm at measurement areas of 100 × 100 μm 2 , and the MRR is 34.920 μm/h, which was performed by developed recycled slurry of PCMP. These are unprecedented results for atomic surfaces at large areas for such a high MRR through reused PCMP. X-ray photoelectron, Fourier transform infrared and Raman spectra reveal that designed composite abrasives generate active species ( e − , h + and •OH), under simulated solar irradiation. The active species weaken Si O bonds, forming Si O Ce bridges and facilitating the extraction of additional silicon ions. Our proposed cleaner polishing method and recycled slurry effectively reduce the manufacturing cost and save energy, promoting environmental protection and ecological benefit.
研究领域:
材料科学
·
环境科学
·
表面工程
✓ 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）