WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 85
·期 7
·2051-2064
·
IF 2.43
Jiang Qihui,Qian Ruyi,Shen Tongdong,Tong Shaoping
Graphite felt (GF) supported cerium oxide (CeO 2 ) composite with sulfation pretreatment (H 2 SO 4 -CeO 2 /GF) was prepared by the impregnation method and employed as the catalyst to activate H 2 O 2 for degradation of isoniazid (INH). The obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray photoelectron spectrum (XPS). The results showed that H 2 SO 4 -CeO 2 /GF had good properties in activating H 2 O 2 for the degradation of INH. The INH removal was about 89.4% in 120 min under the following conditions: H 2 O 2 2.94 mM, H 2 SO 4 -CeO 2 /GF 2.6 g/L, INH 10 mg/L, initial pH at 6.8 and temperature at 25 °C. The effects of some reaction parameters, including initial H 2 O 2 concentration, initial INH concentration, initial pH value, the catalyst dosage and reaction temperature, on INH degradation were investigated. On the basis of mechanism study and intermediate analysis, the possible degradation pathway of INH was proposed. Besides, effective degradation of methyl orange (MO) and norfloxacin (NOF) also confirmed the high activity of H 2 SO 4 -CeO 2 /GF in activation of H 2 O 2 . The H 2 SO 4 -CeO 2 /GF was relatively stable, showing good application prospects. Acidified cerium oxide/GF composite (H 2 SO 4 -CeO 2 /GF) was prepared by impregnation. The activity of H 2 SO 4 -CeO 2 /GF for activation of H 2 O 2 is high even at pH 7.0. The catalyst of H 2 SO 4 -CeO 2 /GF is stable and has great potential for application. The role of acidification of sulfuric acid in the catalyst is explained.
研究领域:
环境化学
·
催化
·
水处理
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Fan Yang,Yucui Hou,Muge Niu,Ting Lu,Weize Wu,Zhenyu Liu
Carboxylic acids (CAs) are considered as an important group of chemicals and are widely used in the chemical industry. The production of CAs via oxidation of lignite is a promising industrial process. In the present work, we found that H5PV2Mo10O40 (HPA) was beneficial to catalytic oxidation of lignite by O2 in aqueous H2SO4 solutions to produce CAs. The effects of HPA concentration, H2SO4 concentration, reaction temperature, initial O2 pressure, and reaction time on lignite conversion and CA yield were studied. The catalytic oxidation of lignite in aqueous HPA/H2SO4 solutions with O2 can yield 56.9 wt % CAs, including 33.5 wt % formic acid, 14.4 wt % acetic acid, 1.5 wt % succinic acid, 1.1 wt % oxalic acid, and 6.4 wt % benzene carboxylic acids (BCAs, including 12 types) at 170 °C and 3 MPa for 60 min. In this catalyst system, the existence of H2SO4 can change the catalytic activity of HPA, and the synergistic effect of HPA and H2SO4 can significantly promote the production of CAs. VV can oxidize lignite or intermediates to form VIV, which can be reoxidized by O2 to complete a redox cycle. In the catalytic oxidation, lignite was converted into water-soluble intermediates at first, and then the water-soluble intermediates were converted to CAs. The catalyst system was reused four times without significant decline in activity. Compared with the traditional alkali-oxygen oxidation, this method can decrease the usage of mineral acid and alkali and lower reaction temperatures.
研究领域:
能源化学
·
工业催化
·
环境化学
·
有机化学
·
资源利用
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yaoyu Yan,Shuchen Sun,A. Shubo,Jing Wei,Faxin Xiao,Ganfeng Tu
Electrolytic manganese residue (EMR), a highly acidic solid waste generated during electrolytic manganese metal (EMM) production, is produced in massive quantities and contains recoverable manganese. However, due to its encapsulation within a dense silicate–gypsum framework, conventional leaching methods often suffer from low efficiency. Long-term stockpiling also poses serious environmental risks such as toxic metal leaching. To address these challenges, an integrated process chain combining wet high-intensity magnetic separation and H₂SO₄/H₂O₂ synergistic leaching was developed. Under optimized grinding conditions (5 min, −74 μm accounting for 84.68 %) and a magnetic field strength of 1.6 T, the manganese grade increased from 5.86 wt% to 18.24 wt%, with a recovery rate of 83.3 % and tailings Mn content reduced to 0.98 wt%. Subsequently, leaching under 2.5 mol L −1 H₂SO₄, twice the stoichiometric amount of H₂O₂, at 60 °C for 2 h yielded a Mn leaching efficiency of 92.87 %. Kinetic analysis indicated that leaching was jointly controlled by interfacial reaction and product layer diffusion during the first 100 min, then shifted to diffusion-dominated behavior between 100 and 180 min. XRD, FTIR, and SEM–EDS characterization revealed that H₂O₂ not only reduces MnO₂ to soluble Mn 2+ , but also induces the formation of rod-like CaSO₄·0.5H₂O and colloidal SiO₂ via exothermic reactions and bubble agitation, resulting in a loose filter cake structure and improved filtration performance. After stepwise impurity removal via neutralization and MnF₂ precipitation, the final MnSO₄·H₂O crystals meet Grade I metallic-impurity limits of HG/T 4823–2023. This study presents a technically feasible and environmentally friendly approach for the efficient recovery of manganese from EMR, offering valuable insights into the integrated resource utilization of metallurgical solid waste and the production of battery-grade manganese sulfate. This process offers a scalable and cost-effective route for the green recovery of Mn and aligns with circular economy goals.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 18
·期 17
·4725-4732
·
IF 8.506
Ting Lu,Muge Niu,Yucui Hou,Weize Wu,Shuhang Ren,Fan Yang
The preparation of formic acid (FA) by catalytic oxidation of sustainable biomass is of significant conceptual and practical interest, because FA is an important chemical and is now produced from non-sustainable fossil fuel. In this work, we found that a binary catalyst of Keggin-type heteropoly acid H5PV2Mo10O40 + H2SO4 was efficient in oxidizing biomass cellulose to FA using oxygen as an oxidant in aqueous solution. In the oxidation, the pH of the aqueous solutions plays a key role, and a decrease in pH improves the transformation. Cellulose was transformed to FA with conversions from 60% to 100% and FA yields from 28% to 61% (based on the carbon atoms in the feedstock) after 5 min of reaction at 180 °C, using H2SO4 as an additive to decrease the pH from 1.79 to 0.56. The influences of the pH on both the catalyst and the reaction pathway were discussed. By decreasing the pH, the oxidation potential and electron affinity were increased due to the formation of protonated H5PV2Mo10O40 and VO2+ species, favoring the reduction of the catalyst and oxidation of the substrate. A reaction pathway for the generation of products was proposed, and the influence of the pH on the reaction pathway was also discussed.
研究领域:
化学工程
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生物质能
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Xinru Mu,Ganyu Zhu,Xu Li,Shaopeng Li,Xiaokang Gong,Huiquan Li,Guoxin Sun
Wet-process phosphoric acid is a fundamental process in the fertilizer industry. The influence of impurities on crystallization kinetics of CaSO4 was investigated in the Ca(H2PO4)2–H2SO4–H3PO4–H2O system using a mixed suspension mixed product removal crystallizer. Effects of Si, Al, Fe, Mg, K, and Na on crystal morphology and structure were examined in the highly acidic system through scanning electron microscopy and high-resolution transmission electron microscopy. Results show that the increase of Mg, K, and Na content facilitates crystal growth. Si, Al, and Fe are beneficial to CaSO4 crystal growth at a certain concentration range. Impurities also affect the crystal morphology, and the addition of Si, Fe, and Na promotes the formation of needle-like crystals compared with other impurities. X-ray diffraction results show that the preferred crystal growth direction is (020), and the interplanar spacing of the crystals is affected by the element radius of the impurities.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 17
·期 1
·453-459
·
IF 6.852
Muge Niu,Yucui Hou,Shuhang Ren,Weize Wu,Kenneth N. Marsh
Formic acid (FA) is an important material widely used in the chemical industry and in processes involved in energy storage and transformation. In this work, production of FA from wheat straw, an abundant lignocellulosic biomass, in NaVO3–H2SO4 aqueous solution with molecular oxygen (O2) was studied. The conversion showed high efficiencies: 47% (based on carbon, 75.2% based on mass) of FA and 7.3% (based on carbon, 7.6% based on mass) of acetic acid were obtained. The products mainly come from polysaccharides (hemicellulose and cellulose) in wheat straw. Acetic acid is derived from the acetyl groups in (1) the hemicellulose structure or (2) the deep hydrolysis product, levulinic acid. The removal of each lignocellulosic component in wheat straw follows the order: hemicellulose, lignin and cellulose. The catalytic system shows good reusability, and multiple feedings led to a high concentration of FA, which is beneficial to reduce FA–water separation cost.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2021
·Vol. 68
·期 4
·e17556
·
IF 3.993
Zhihong Ma,Jialei Sha,Weizhong Zheng,Weizhen Sun,Ling Zhao
To enhance the catalytic performance of H 2 SO 4 -catalyzed alkylation, various catalytic additives have drawn considerable attentions. Herein, the effects of deep eutectic solvent (DES) additives on catalytic performance and the interfacial properties of H 2 SO 4 alkylation were systematically investigated using experimental methods and molecular dynamics (MD) simulation. Experimental results indicate that DESs with the optimal concentration about 1.0 wt% can efficiently improve C 8 selectivity and research octane number of alkylate, especially at low temperature, but contribute less to the lifetime of H 2 SO 4 . MD results reveal that the phenyl molecules of DESs additives play a major role in enhancing interfacial properties of H 2 SO 4 alkylation, including enlargement of interfacial thickness, promotion of isobutane relative solubility and diffusion to butene, which is probably the main reason for the better quality of alkylate. This work gives a good guideline for the design of novel DESs for H 2 SO 4 alkylation.
研究领域:
化学工程
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催化
·
材料科学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yanxia Liu,Wei Du,Xiuquan Yao,Chunlin Liu,Xiaofang Luo,Lei Guo,Chao Guo
The corrosion inhibition performance of Omeprazole (OMP) on X60 steel in 0.5M H 2 SO 4 solution was studied by electrochemical impedance spectroscopy and electrochemical polarization curves. These tests are complemented by theoretical calculations using molecular dynamics. The corrosion inhibition efficiency increases with the concentration of OMP, a hybrid corrosion inhibitor that adsorbs on X60 steel following the Langmuir adsorption isotherm. The adsorption configuration calculated by molecular dynamics showed that the OMP molecules were arranged in parallel on the surface of X60 steel, which ensured its excellent inhibition performance.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
Results in Engineering
·
2023
·
IF 5
Zongyi Zhou,Xuehong Min,Shan Wan,Jinhang Liu,Bokai Liao,Xingpeng Guo
The extract of waste feverfew root (FRE) is firstly used as green corrosion inhibitors for carbon steel in H 2 SO 4 solution. Weight loss method and electrochemical tests are carried out to evaluate the corrosion inhibition efficiency. The in-situ scanning vibrating electrode technique is applied to monitor the inhibitive behavior of corrosion inhibitor. Water contact angle, scanning electron micrograph and X-ray photoelectron spectroscopy are used to characterize the compositions and microstructure of corrosion products. Results indicate that the optimum corrosion inhibition can reach 98.1% at 400 mg/L, and it can retain above 91% after immersion for 96 h. Based on the adsorption isotherm calculation, FRE and KI obey to Langmuir adsorption model. The adsorption film possesses hydrophobicity and can effectively retard the evasion of corrosive media.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
DOI
高影响因子
Biotechnology for Biofuels
·
2012
·Vol. 5
·期 1
·1-12
·
IF 6.088
Xu Ning,Zhang Wei,Ren Shuangfeng,Liu Fei,Zhao Chunqiao,Liao Haofeng,Xu Zhengdan,Huang Jiangfeng,Li Qing,Tu Yuanyuan,Yu Bin,Wang Yanting,Jiang Jianxiong,Qin Jingping,Peng Liangcai
Background Lignocellulose is the most abundant biomass on earth. However, biomass recalcitrance has become a major factor affecting biofuel production. Although cellulose crystallinity significantly influences biomass saccharification, little is known about the impact of three major wall polymers on cellulose crystallization. In this study, we selected six typical pairs of Miscanthus samples that presented different cell wall compositions, and then compared their cellulose crystallinity and biomass digestibility after various chemical pretreatments. Results A Miscanthus sample with a high hemicelluloses level was determined to have a relatively low cellulose crystallinity index (CrI) and enhanced biomass digestibility at similar rates after pretreatments of NaOH and H 2 SO 4 with three concentrations. By contrast, a Miscanthus sample with a high cellulose or lignin level showed increased CrI and low biomass saccharification, particularly after H 2 SO 4 pretreatment. Correlation analysis revealed that the cellulose CrI negatively affected biomass digestion. Increased hemicelluloses level by 25% or decreased cellulose and lignin contents by 31% and 37% were also found to result in increased hexose yields by 1.3-times to 2.2-times released from enzymatic hydrolysis after NaOH or H 2 SO 4 pretreatments. The findings indicated that hemicelluloses were the dominant and positive factor, whereas cellulose and lignin had synergistic and negative effects on biomass digestibility. Conclusions Using six pairs of Miscanthus samples with different cell wall compositions, hemicelluloses were revealed to be the dominant factor that positively determined biomass digestibility after pretreatments with NaOH or H 2 SO 4 by negatively affecting cellulose crystallinity. The results suggested potential approaches to the genetic modifications of bioenergy crops.
研究领域:
植物学
·
生物能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Yangyang Xin,Yufeng Hu,Yichuan Wang,Siqi Jiang,Mengchen Li,Kebin Chi,Shang Zhang,Fei Gao,Chunxiao Ren,Shuai Zhang,Chenglong Ma
For alkylation catalyzed by H 2 SO 4 , the promotion of solubility of isobutane in H 2 SO 4 is of major importance to the enhancement of quality of alkylates. ASO (acid-soluble oils or conjunct polymers or red oil) are the potential co-catalyst to improve the solubility of isobutane and to optimize the interfacial characteristics of acid/hydrocarbon dispersions. On the basis of the calculation results of COSMO-RS method, we found that the solubility of isobutane in H 2 SO 4 was obviously increased upon the addition of most ASO molecules. Moreover, a better dissolution of isobutane in H 2 SO 4 can be achieved by adding the hydrocarbons like paraffins and cycloparaffins into H 2 SO 4 . On the basis of these findings, two cycloparaffins were selected and used as the co-catalyst (the co-catalysts A and B) to improve the performance of the H 2 SO 4 catalyst. The alkylation results showed that these cycloparaffins enhanced the quality of alkylates. In particular, upon the addition of the co-catalyst B, the RON (research octane number) value, the TMP/DMH (trimethylpentane/dimethylhexane) ratio, and the contents of C8 and TMP (trimethylpentane) were increased significantly from 92.67 and 6.51, 68.25% and 59.10% to 94.38 and 6.97, 74.81% and 65.34%, and the consumption of the H 2 SO 4 catalyst was reduced by 38%.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Xianguang Zeng,Lin Zhu,Xingwen Zheng
The inhibitive effect of N-lauroyl L-lysine on the corrosion of mild steel in 0.5 M H 2 SO 4 solution was investigated by electrochemical technique, weight loss measurement, scanning electron microscope (SEM) and quantum chemical calculation. The results showed that N-lauroyl L-lysine was a moderate cathodic inhibitor for mild steel in 0.5 M H 2 SO 4 solution with its inhibition efficiency increasing with concentration, and decreasing with temperature. The adsorption of N-lauroyl L-lysine on the surface of mild steel obeyed El-Awady thermodynamic-kinetic model, and the thermodynamic and kinetic parameters, as well as quantum chemical parameters, were determined to discuss the mechanism of inhibition of N-lauroyl L-lysine on mild steel surface.
研究领域:
材料科学
·
电化学
·
量子化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）