SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Gaoshan Xing,Silan Li,Yongguang Wang,Yutai Zhang,Wenbo Wang,Wen Wang,Liqiang Qi
To address the requirements of low-temperature dry flue gas desulfurization (FGD) in hot blast furnaces of steel mills, a high-activity calcium hydroxide (Ca(OH) 2 ) desulfurizer was synthesized using a simple quicklime digestion method. The incorporation of the metal oxide Al 2 O 3 and an organic additive digestion solution (comprising 1.5 wt% urea, 1.5 wt% polyethylene glycol 400 (PEG), and 3 wt% triethanolamine (TEA)) enhanced the physical morphology and chemical properties of the desulfurizers. The specific surface area increased from 3.23 m 2 /g (quicklime) to 43.24 m 2 /g, the pore volume and average pore size are enhanced to 0.195 cm 3 /g and 0.013 nm. The synthesized desulfurizer demonstrated a remarkable 100 % removal efficiency, a high sulfur capacity of 21.49 mg/g, and an extended breakthrough time of 48.5 min under simulated flue gas conditions (100℃, 3 % O 2 , and 15 % CO 2 ). Following adaptability and carbon dioxide resistance tests in the laboratory, 10 tons of the preferred desulfurizer, designated CA@UPT #1, were produced in the quicklime digestion factory and subsequently tested in the steel mill. After two pilot tests, the improved desulfurizer, CA@UPT #2, successfully achieved the ultra-low emission standard in China (35 mg/Nm 3 ). Characterization techniques, including BET, SEM, TEM, HRTEM, XRD, XPS, and particle size distribution analysis, were employed to investigate the reaction mechanism. Additionally, kinetic and diffusion studies were conducted on both lab- and industry-produced calcium powders. The economic advantages of this desulfurizer were underscored through cost calculations. The superior performance in FGD indicates the significant potential of calcium powder desulfurization, and an analysis of influencing factors was summarized to facilitate the advancement of Ca(OH) 2 powder desulfurization technology.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
·
2022
·
IF 13.716
Dan Yu,Fei Liu,Changdong Zou,Xiao Yang
Shortage of soluble Fe in seawater is a limiting condition for benthic seaweeds growth. Utilizing steelmaking slag as the Fe source for seaweeds growth has been proposed. Aiming to find a cost-effective method to promote Fe release, we investigate the effect of adding municipal green wastes. By conducting leaching experiments in freshwater, a sharp improvement in Fe release was observed with the addition of tangerine peel together with steelmaking slag. The flavonoids supplied from the tangerine peel, vicenin-2, apigenin, hesperidin, vitexin, hesperetin and diosmin were observed to have a promotion effect on Fe release. Formation of stable flavonoid-Fe(II) chelates changes the thermodynamic property of Fe(II) in water and disturbs the equilibrium between Fe(II) in slag and Fe(II) in water, which promotes Fe release from slag. These results demonstrate the feasibility to develop a technology for Fe supply in seawater by utilizing the mixture of steelmaking slag and municipal green wastes.
研究领域:
环境科学
·
海洋生物学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Deng Wang,Jiaxin Yang,Fei Xue,Jihui Wang,Wenbin Hu
Zinc coordinated 1-hydroxyethylidene-1,1-diphosphonic acid (Zn-HEDP) film was fabricated on steel surface by coordination self-assembly method. The surface morphology and chemical composition of Zn-HEDP film were investigated by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), and the structural and valence state of Zn-HEDP film was determined by Fourier transform infrared spectroscopy (FTIR), Raman spectra and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of Zn-HEDP film in 3.5wt% NaCl solution was investigated by using potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS) techniques. The experimental results show that Zn-HEDP film is in a smooth surface with disturbed nanoparticles. The protection efficiency of Zn-HEDP film to steel in 3.5 wt% NaCl solution is firstly increased and then decreased with the increasing of zinc concentration, pH value and assembly time. The optimum preparation conditions for Zn-HEDP film are the zinc concentration of 10 mmol/L, pH value of 5.0 and assembly time of 30 min, under which the protection efficiency of film is reached to 95.79 %. The coordination between zinc ions and HEDP can effectively increase the binding energy with Q235 steel. Zinc ions can improve the compactness and thickness of Zn-HEDP films as bridging agents, which prevent Q235 steel from corrosive solution.
研究领域:
材料科学
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电化学
·
表面工程
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产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 15
·3758
·
IF 3.1
Xin Sun,Huiwen Tian,Fangxin Zou,Weihua Li,Yujie Qiang,Baorong Hou
High toxicity is the main reason for the limited application of traditional corrosion inhibitors. Herein, it is critical to find a green, efficient, and long-term stable alternative substitute for the hazardous and conventional corrosion inhibitor.Ambrosia trifida Lis widely distributed in fields and riverside wetlands as an invasive plant in China. According to the concept of turning waste into treasure, the extract ofAmbrosia trifida Lleaves (ATL) has the potential to address this issue due to its natural origin and abundant presence of heterocyclic organics. Therefore, ATL, as a green corrosion inhibitor, is prepared for the first time via a simple water-based extraction method. FT-IR (Fourier transform infrared spectroscopy) and UV-Vis (UV-visible) indicate that ATL extract contains abundant heterocyclic organics with conjugated structures, which exhibit the potential to become a high-efficiency inhibitor. Notably, the active sites of ATL molecules and their interaction with Q235 steel at the molecular/atomic level are revealed via theoretical calculations. The highestEbindingvalue observed for the major components in the ATL extract is 259.66 kcal/mol, implying a significant adsorption capacity. The electrochemical results verify that microdose ATL extract can prominently inhibit steel corrosion, and the highest inhibition efficiency (η) is 97.5% (1000 mg/L). Following immersion for 24 h, theηvalue is enhanced to 99.0%, indicating a reliable and long-term ATL extract protection film is formed on the steel surface in harsh acidic solutions. The results of the weight loss, SEM (scanning electron microscope), and LSCM (laser scanning confocal microscopy) are consistent with the above conclusions. Finally, this study anticipates providing theoretical support for developing novel green plant extract inhibitors and aiding in their application in industrial pickling environments.
研究领域:
材料科学
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环境科学
·
植物学
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DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 11
·2300006
·
IF 2.5
Hongliang Duan,Jiawei Ji,Chaochao Cao,Wenjuan Bai,Zirui Song,Yanming Xue,Chengchun Tang
Due to its excellent physical barrier behavior and high physicochemical stability, hexagonal boron nitride (h-BN) can improve the anti-corrosion capacity of a favorite protective coating onto metals. However, the poor dispersion of h-BN filler in the formation of polymer composites does not promote its further wide application in the field of corrosion protection. In this work, a new CeO 2 @BNNSs filler is highly dispersed into aqueous epoxy (EP) to make nice coatings onto steels. As a result, after immersing them into an NaCl solution of 3.5 wt% for 20 days, the as-prepared CeO 2 @BNNSs/EP composite coatings can keep an impedance modulus (|Z| f = 0.01 Hz ) value of 9.61 × 10 7 Ω cm 2 , which is larger than those of the blank EP and the EP filled with the h-BN and BNNSs fillers. In addition, compared to the EP, h-BN/EP, and BNNSs/EP coatings, the higher corrosion potential, the properties of larger polarization resistance, and lower corrosion current density for the CeO 2 @BNNSs/EP coatings indicate CeO 2 @BNNSs/EP's excellent protective ability to the steel from corrosion. It is believed that this kind of CeO 2 @BNNSs/EP composite materials and its coatings would be highly promising for application in future advanced anti-corrosion environments and devices.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Ning Du,Ruifang Guan,Pengkun Hou
Fluorescent indicators of a wider labeling pH range of 7.0–12.5 were prepared to characterize the pH evolution of the accelerated/natural carbonation of cement and the corrosion of steel bar. Compared with conventional indicators (phenolphthalein, pH range of 8.2–8.5), these indicators indicate multiple pH-induced switches of different fluorescence emissions for the fluorescence resonance energy transfer between donor–acceptor. The results showed that the newly-developed indicators are sensitive and applicable for labeling both natural and accelerated carbonation of cement. Investigations by Fourier Transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis demonstrated the reliability of these indicators, that is, in the “uncarbonated area” shown by phenolphthalein, carbonization actually occurs as exhibited by fluorescent indicators. Furthermore, electrochemical impedance spectroscopy, as well as dynamic potential polarization studies showed that rusting/corrosion of reinforcing steel started when the pH dropped to 11.5 in the simulation study. This work promoted the contribution of fluorescent indicators in cement carbonation characterization, with a wide pH response.
研究领域:
材料科学
·
化学工程
·
土木工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Jiangya Ma,Genyu Wu,Rui Zhang,Wei Xia,Yong Nie,Yanli Kong,Bangtao Jia,Sha Li
Large amounts of wastewater that contained emulsified oil were generated in the steel rolling process of the steel industry. The weak interaction between flocculants and emulsified oil and the slow floc separation are the main bottleneck in oily wastewater treatment. To solve this problem, this study successfully prepared three magnetic chitosan-based flocculants (MCS) with different hydrophobic monomer contents to treat steel rolling oily wastewater (SROW). The oil content, turbidity, chemical oxygen demand (COD), and UV 254 removal rates were investigated by using MCS and compared with commercial flocculants. Results showed that as the dosage was 6 mL/L, MCS-2 had an optimal effect on oil and turbidity removal with 95.79 % and 87.85 %, respectively. The best COD removal rate of 66.67 % was achieved at a dosage of 4 mL/L with MCS-3. GC–MS analysis showed that the removal efficiency of MCS on alkanes was significantly better than that of aromatic hydrocarbons. Density functional theory calculations demonstrated that the hydrophobic groups of MCS can combine alkanes and aromatic hydrocarbons through hydrophobic association. Furthermore, charge neutralization, hydrophobic association, and adsorption bridging contributed to emulsified oil removal synthetically. The increased content of hydrophobic monomers enhances the interaction between flocculants and emulsified oil, which was significant for SROW treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Hongtao Wang,Zhibao Huo,Qiang Jin
The steel industry accounts for 30 % of global industrial greenhouse gas emissions, which is primarily attributed to the utilization of metallurgical coke. While carbon-neutral biochar is a material that rivals conventional coke, the inferior mechanical properties and higher preparation temperature limit biochar as an ideal alternative for metallurgical coke. Herein, ammonium octamolybdate is employed to transform birch residues into metallurgical-grade biocoke at low temperature. AOM affords advanced catalytic capacity during pyrolysis under a nitrogen-oxygen mixture, inducing the formation of superoxide free radicals on birch residues to produce 2,5-furandicarboxylic acid. The resulting 2,5-furandicarboxylic acid serves as a polymerization agent to facilitate the cross-polymerization between biochar and bio-oil for preparing biocoke. The produced biocoke displays superior 6.2 MPa of compressive strength, 59.2 % of coke strength after reaction, 92.28 % of mechanical durability, and 38.79 MJ/kg of higher heating value, close to first-grade metallurgical coke. Carbon emission analysis shows replacing 30 % of metallurgical coke by biocoke for 1 t of iron production reduces 419.43 kg of CO 2 emissions. This study presents a mild pyrolysis-polymerization strategy to produce densified metallurgical-grade biocoke for metallurgical coke alternative and underscores biocoke's potential for low-carbon production of the steel industry.
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产品关联
DOI
高影响因子
Water Reuse
·
2024
·Vol. 14
·期 3
·342-354
·
IF 4.3
Liu Z.,Xu M. Y.,Yin H.,Xie C. W.,Liu Q.,Liu H. T.,Liang S. Y.,Li J. K.,Zhang T. Y.,Li T.,Hu H. Y.,Xu B.
Membrane fouling is a prominent issue that affects the stable and efficient operation of reverse osmosis (RO) in reused water treatment. In this study, a zero-discharge RO system was adopted to treat the ultrafiltration permeate from a steel plant with the combined multi-wavelength UV-LED/chlorine process, focusing on organic structure modification and membrane fouling control. The results showed that the UV-LED/chlorine process could not only efficiently remove the dissolved organic carbon and the total nitrogen of the RO influent but also alter the organic substances from large molecules to small ones. In addition, the longer wavelength of a 295 nm UV-LED/chlorine process exhibited a greater RO permeate flux of 158 LMH, as compared to the shorter wavelength of 255 nm with the flux of 152 LMH. Moreover, compared to the single-wavelength, the dual-wavelength UV-LED/chlorine process played a more significant role in RO filtration performance, which induced a looser and thinner foulant structure, resulting in an 8% larger permeate flux and recovery at 275 + 295 nm than at 295 nm. This study demonstrated that the combined UV-LED/chlorine process could effectively alleviate RO membrane fouling. Our findings can provide theoretical and technical support for the sustainable development of membrane-based reused water treatment in the steel industry. Multi-wavelength UV-LED/chlorine process was effective for the pretreatment of RO for steel reused water treatment. UV-LED/chlorine process could oxidize organics to enhance RO filtration. Longer wavelength UV-LED/chlorine process was more favorable for organics removal and RO fouling control. Dual-wavelength UV-LED/chlorine pretreatment can induce less RO membrane fouling as compared to single wavelength.
研究领域:
环境工程
·
水处理技术
·
膜科学
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Yunqiang Yi,Guoquan Tu,Dongye Zhao,Pokeung Eric Tsang,Zhanqiang Fang
In this study, Fenton-like catalysts (magnetic biochar) were synthesised by pyrolysis the different biomass pre-impregnated with steel pickling waste liquor. The results of degradation of metronidazole illustrated that the catalytic performance of magnetic biochar was significantly affected by biomass feedstocks. Electron spin resonance (ESR) and radical quenching experiments showed that the hydroxide radicals ( OH) were the key reactive oxygen species responsible for the metronidazole removal. Levels of OH varied among different systems consistent with the removal of metronidazole. The activation of H 2 O 2 by carbon-containing components and Fe species (Fe 2 O 3 and Fe 3 O 4 ) in magnetic biochar were confirmed to be less crucial to the degradation of metronidazole. Moreover, the Fe(II) (FeO) in magnetic biochar played the dominating role in degradation of metronidazole, and the Fe(II) content difference caused by biomass feedstocks was responsible for differences in the catalytic performance of different types of magnetic biochar.
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 HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Zeqi Zheng,Weitao Liu,Qixing Zhou,Jiantao Li,Aurang Zeb,Qi Wang,Yuhang Lian,Ruiying Shi,Jianlin Wang
Considering the stability and economy of immobilized enzymes, this study prepared co-modified biochar immobilized laccase product named Fe 3 O 4 @ [email protected] @LC via orthogonal experimental design and explored its possibility of remediating polycyclic aromatic hydrocarbons (PAHs) contaminated soil in steel plants. Compared with the free laccase treatment, the relative activity of Fe 3 O 4 @ [email protected] @LC remained 60 % after 50 days of incubation at room temperature. The relative activity of Fe 3 O 4 @ [email protected] @LC could still retain nearly 80 % after five reuses. In the process of simulating the PAHs-contaminated site treatment experiment in Hangzhou Iron and steel plant, immobilized laccase exhibited efficient adsorption and degradation performances and even the removal rate of 5-ring PAHs reached more than 90 % in 40 days, resulting in improving urease activity and dehydrogenase in the soil and promoted the growth of a PAH degrading bacteria ( Massilia ). Our results further explained the efficient degradation effects of Fe 3 O 4 @ [email protected] @LC on PAHs, which make it a promising candidate for PAHs-contaminated soil remediation.
研究领域:
环境科学
·
生物技术
·
土壤学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2022
·Vol. 18
·期 14
·2829-2841
·
IF 4.046
Weihao Pan,Jiahao Dong,Taijiang Gui,Ren Liu,Xiaoya Liu,Jing Luo
A novel kind of inhibitor-loaded polyaniline (PANI) microcapsule was prepared by Pickering emulsion photopolymerization using polyaniline particles as the Pickering emulsifier. In our strategy, water-dispersible polyaniline nanoparticles were firstly synthesized using a micelle template method and used to stabilize oil-in-water emulsions, in which the oil phase contained photo-crosslinkable and pH sensitive monomers and a photo-initiator. Under UV light, the pH-responsive monomers underwent photo-polymerization and crosslinking and converted to microcapsule shells. During this process, polyaniline nanoparticles were trapped in the microcapsule shells, leading to the formation of PANI microcapsules. The structure and morphology of the synthesized PANI microcapsules were analyzed using FTIR spectroscopy, SEM, and EDX mapping. The inhibitor (mercaptobenzothiazole, MBT) was subsequently incorporated into the PANI microcapsule as a functional core and demonstrated pH-sensitive releasing behavior. With the anti-corrosive PANI as the microcapsule wall and the inhibitor MBT as the core, the as-prepared MBT loaded PANI (MBT@PANI) microcapsule could afford dual corrosion protection, allowing smart protection of metals when exposed to corrosive conditions. The MBT@PANI microcapsules were embedded in UV-cured coating for protecting steel. The corrosion protection performance of the coating with MBT@PANI microcapsules was evaluated using the electrochemical impedance spectroscopy technique and salt spray test, which demonstrated the synergistic inhibition effect of the PANI wall and the loaded MBT in improving anti-corrosion performance of the coating.
研究领域:
材料科学
·
腐蚀工程
·
高分子化学
·
表面涂层
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）