NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 16
·7256-7264
·
IF 2.7
Hele Hua,Jing Yang,Rui Li,Yunfang Wang,Caimei Fan,Jianxin Liu,Yawen Wang
Resourceful utilization of coal gasification fine slag (CGFS), a typical coal-based solid waste, has always been a trial and challenge in solid waste treatment. In developing its utilization value, fewer steps and lower energy consumption during treatment are more favorable. Herein, CGFS was modified by combining BiOBr to develop its possible application in the photocatalytic degradation of organic pollutants. The BiOBr/CGFS photocatalysts were synthesized at ambient temperature by a simple hydrolysis method with zero pre-treatment of CGFS. The synthesized composites show improved effective photocatalytic performance in the degradation of organic pollutant and the BOB/CGFS20 showed the best activity, which can remove 89.3% of phenol within 90 minutes, 84.53% of sulfamethoxazole within 75 minutes and 84.96% of bisphenol A within 120 minutes. Moreover, the components in CGFS that may play a positive role were investigated and the results showed that CGFS acted as a carrier, and most likely, the carbon materials and metal oxides such as Fe2O3 and/or TiO2 in it led to the improvement of the quantum efficiency of BiOBr and further promoted the photocatalytic performance. This study aims to provide some references and inspiration for the utilization of CGFS and environmental protection.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
International Journal of Coal Preparation and Utilization
·
2024
·
IF 2
Xiangyun Sun,Qifa Lu,Jiakun Tan,Long Liang,Haiyang Gao,Guangyuan Xie,Yaoli Peng
This study investigates the flotation performance of coal gasification fine slag in the presence of metal ions with different valences. The impact of metal ions on the surface topography, wettability, zeta potential, functional group, and particle size distribution of coal gasification fine slag were analyzed. The results demonstrated that K+, Ca2+, Mg2+, and Al3+ all have a positive effect on flotation, with Al3+ being particularly effective. At a concentration of 0.2 mol/L, Al3+ increased the recovery of combustible matter in coal gasification fine slag from 66.70% to 91.05% compared to deionized water. Metal ions reduce the absolute value of the gasification fine slag potential, compress its double layer while increasing its surface hydrophobicity. Higher ion concentration leads to a closer-to-zero potential and increased hydrophobicity. Additionally, Al3+ promote diesel adsorption onto coal gasification fine slag. This work explains the effects of metal ions on coal gasification fine slag flotation.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ningning Zhang,Mengyan Cheng,Rui Han,Zhen Li,Anning Zhou,Hong Wang
Coal gasification fine slag (CGFS) is a large solid waste in the field of coal chemical industry, and the separation of its carbon and ash is a prerequisite for the large-scale utilization of CGFS. At present, the flotation separation process of CGFS faces the prominent bottleneck of high consumption of traditional non-polar hydrocarbon oil collectors and poor flotation effect. To address this challenge, three fatty acids, oleic acid (OA), n-decanoic acid (DA), and naphthenic acid (NA), were used in this study to compound with the nonpolar hydrocarbon oil dodecane, respectively, as novel collectors for CGFS flotation. The effect and action mechanism of the composite collectors on CGFS flotation were investigated through flotation experiments as well as surface/interfacial tension, laser particle size, heat of wetting, FTIR, XPS, and induction time tests. The results show that the composite collectors can enhance the flotation effect of CGFS while reducing the chemical consumption. The addition of polar fatty acids can effectively reduce the interfacial tension of the collector-water system and thus increase the dispersion of the collector in water. Meanwhile, the addition of fatty acids makes the composite collector contain both polar and nonpolar groups. The polar groups form hydrogen bonds with the oxygen-containing groups on the residual carbon surface to mask the hydrophilic region, and the nonpolar groups are exposed to the slurry to enhance the hydrophobicity of the residual carbon surface, which makes the residual carbon adhere to the air bubbles more easily and thus facilitates its flotation recovery from CGFS. This study has important theoretical guidance for the efficient separation and resource recovery of CGFS.
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
Journal of CO2 Utilization
·
2021
·
IF 7.132
Zekai Miao,Zhenkun Guo,Guofeng Qiu,Yixin Zhang,Jianjun Wu
Coal gasification fine slag (FS) is an inevitable by-product in the gasification process. The preparation of activated carbons (ACs) can realize the value-added utilization of FS. In this work, FS with about 70 % ash yield was prepared to ACs through KOH activation and then used to CO 2 capture. The residual carbon (RC) obtained from acid-treatment of FS was also to fabricate ACs. The ACs had interconnected macropores and micro-mesopores structure. The ACs were characterized using adsorption of nitrogen, SEM, TEM, Raman spectra, XRD, and TG. The optimized FS-based AC had a specific surface area of 1187 m 2 /g and a pore volume of 0.89 cm 3 /g. Furthermore, at the same ash yield, the surface area of FS-based ACs was larger than that of RC-based ACs. Experimental evidence presented that abundant metallic elements were leached using the impregnation method to mix KOH and raw material. Additionally, they could react with the carbon matrix and catalyzed the activation reactions to promote the development of pore structure. The ACs showed well CO 2 adsorption performance. FS2−800-60 exhibited a high CO 2 capture of 4.01 and 2.53 mmol/g at 0 and 25 °C. Additionally, the ACs showed a high adsorption rate that CO 2 adsorption uptake almost reached constant values within two minutes. All these results illustrate that ACs prepared from FS could be high efficiency and cost-effective adsorbent for CO 2 capture.
研究领域:
能源材料
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yanjie Niu,Jie Xu,Zekai Miao,Fanhui Guo,Yixin Zhang,Jianjun Wu
From the perspective of environmental protection and resource utilization, the feasibility of treating m -cresol wastewater with coal gasification fine slag (GFS) as particle electrodes in an electrocatalytic system was evaluated to achieve the purpose of treating waste with waste. Characterization by scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET), Raman, and fourier transform infrared spectroscopy (FTIR) confirmed that the GFS featured a diverse inorganic framework, large specific surface area (as large as above 155 m 2 g −1 ), hierarchical porous structure, and plenty of catalytic sites. The Venn diagram method was used to systematically propose the following distribution modes of residual carbon (RC) and ash in GFS: discrete distribution, embedded distribution, crosslinked distribution, and association and bonding. Only 8 g L −1 of GFS particle electrodes prevented the formation of a yellow sticky passivation film on the anode. Compared to the two-dimensional electrocatalytic system (47.89%), the wastewater treatment efficiency was increased by 108.81%. Zero-order kinetic results showed that the reaction rate constant was the highest (2.1106 mg L −1 ·min −1 ) when the secondary flotation RC was adopted as particle electrodes. It was indicated that GFS in discrete mode played either no role or at most a minor role. Last but not least, the synergy of RC and ash was revealed from a molecular perspective. The RC exhibited hierarchical microporous/mesoporous/macroporous structure, which facilitated the entry of H 2 O 2 into the catalytic sites of ash. Abundant catalytic sites in ash accelerated adsorption and oxidation processes on RC surfaces.
研究领域:
环境科学
·
资源利用
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Yanjie Niu,Jie Xu,Liqing Chen,Sixi Guo,Fanhui Guo,Yixin Zhang,Jianjun Wu
As a typical coal-based solid waste, coal gasification fine slag (GFS) will have an annual discharge of more than 50 million tons in 2025 in China alone. However, the difficulty of its resource utilization lies in the precise separation of carbon and ash due to their complex distribution pattern. There is an urgent need to develop GFS-based materials for comprehensive utilization of carbon and ash. In this study, a combined process of acid leaching and pyrolysis was designed, in which active metal iron was leached from ash and immobilized on the surface of residual carbon in the form of Fe-N-C. The unique structure of Fe-N doped carbon/ash synergistically improved the efficiency of electrocatalytic degradation of organic wastewater by 72.78 ± 1.37%. The hierarchical porous structure of residual carbon considerably enhanced the accessibility of ash catalytic sites. Abundant ash defects and Fe-N active sites promoted the conversion of free radical precursors to reactive oxygen species (ROS). The removal rate of various organic wastewater within 35 min reached more than 100 ± 1.83% %, with excellent electrocatalytic performance and pH adaptability. Fe-NCPE had a high specific surface area (318.36 m 2 ·g −1 ), orderly graphite phase (002 crystal surface size 1.3 nm), and abundant catalytic sites. We also proposed the catalytic mechanism by combining molecular simulation with experiments. The high adsorption capacity above 24.07 ± 0.12 mg·g −1 ensured the continuous and rapid supply of pollutants and H 2 O 2 near the catalytic site·H 2 O 2 was converted into ROS mainly composed of hydroxyl groups through the valence state change of aluminum or Fenton-like reaction of nitrogen-linked iron. The ROS then attacked organic molecules to degrade pollutants. The above two processes corresponded to two cyclic catalytic reactions. Therefore, this study provides an innovative and promising approach for comprehensive utilization of carbon and ash in GFS.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Bo Lv,Xiaoman Chai,Xiaowei Deng,Feishuo Jiao,Chaojun Fang,Baolin Xing
Recovering inner residual carbon is important for fully utilizing coal gasification fine slag (CGFS) resources. In this study, we adopted a combined gravity-separation and flotation process to efficiently recover residual carbon by considering the characteristics of the CGFS and optimizing the operating factors of the process. CGFS is principally a mixture of residual carbon and ash, with low-density particles containing more of the former. Accordingly, residual carbon is preliminarily enriched by gravity separation, in which gas velocity ( v g ) and water velocity ( v w ) significantly impact separation efficiency, followed by feed volume ( m ). The residual carbon in the initial concentrate was preliminarily enriched (i.e., loss on ignition ( LOI ): 55.90%; combustible recovery ( R o ): 72.36%) under appropriate operating conditions (i.e., v w = 0.04 m/s, v g = 3 m/s, m = 150 g). Moreover, the quality of the flotation concentrate was most influenced by collector dosage ( m c ), followed by aeration rate ( η ), frother dosage ( m f ), stirring speed ( w ), and grinding time ( t ) during flotation of the primary concentrate. The flotation concentrate exhibited LOI and R o values of 90.95% and 50.34%, respectively, under the optimal flotation conditions (i.e., m c = 20 kg/t, m f = 15 kg/t, w = 2600 rad/min, η = 200 L/h, t = 360 s); it has a high residual carbon content and is an ideal raw material for preparing fuels or carbon materials.
研究领域:
矿物加工工程
·
资源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Bin Liu,Peng Lv,Ruofei Wu,Yonghui Bai,Jiaofei Wang,Weiguang Su,Xudong Song,Guangsuo Yu
The discharge of large-scale industrial solid waste and wastewater has caused severe damage to environmental health. In this study, the adsorption behaviors of Pb(II) and Congo Red (CR) dye in single and binary aqueous systems were investigated using novel functionalized nanoporous glass microspheres (NGM). The NGM material was fabricated from coal gasification fine slag (CGFS) by a simple treatment and characterized using TG, BET, XRD, TEM, FT-IR, and XPS to analyze its physicochemical properties. The adsorption experiments showed that the adsorption amounts of DMA-NGM for Pb(II) and CR were 302.39 mg/g and 342.74 mg/g for the single systems, and 372.73 mg/g and 412.93 mg/g for the binary systems, respectively. The increased adsorption capacity was attributed to the synergistic effect of electrostatic attraction and chelation. Furthermore, the pseudo-second-order model and Elovich model could reasonably describe the adsorption of Pb(II) and CR on DMA-NGM. Pb(II) adsorption on DMA-NGM was monolayer adsorption and CR adsorption was multilayer adsorption. In summary, the results demonstrate the potential of efficient and environmentally friendly adsorbents for the resource recovery of CGFS and the processing of printing and dyeing wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Rui Han,Shizhi Ruan,Anning Zhou,Zhen Li,Hong Wang,Ningning Zhang
Waste fried oil (WFO) and coal gasification fine slag (CGFS) are both environmentally hazardous wastes, and the flotation separation of resources from CGFS is over-reliant on non-renewable petrochemicals as collectors, it is significant to utilize WFO to prepare renewable collectors for CGFS separation. In this study, six surfactants were selected to be compounded with WFO to prepare renewable collectors, and the flotation effect of the compounded collectors on CGFS and the surfactant-enhanced mechanism for WFO flotation effect were examined through flotation experiments, flotation kinetics experiments, laser particle size analysis, FTIR analysis, XPS analysis, and induction time tests. The results show that WFO alone needs to be used in a large dosage (>30 kg/t) in order to show better flotation performance than diesel, while the flotation performance is greatly improved after compounding with surfactants, among which the best effect is achieved with Span80, and the dosage cut-off point of the compounded collector for flotation better than diesel is reduced to 12.5 kg/t. The surfactant can make the dispersed droplet size of WFO in water decrease from D 50 = 120 μm to 5.63 μm. Meanwhile, the surfactant-assisted WFO can be adsorbed on the residual carbon surface of CGFS through hydrophobic and hydrogen-bonding forces, which can mask the hydrophilic region of the carbon surface and enhance its hydrophobicity. Surfactant-assisted WFO can further shorten the adhesion induction time between CGFS particles and air bubbles, thus facilitating the recovery of more residual carbon in a shorter period of time. The findings can provide theoretical basis and technical support for the resourceful disposal of WFO and CGFS synergistically.
研究领域:
环境科学
·
资源回收
·
化工
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yang Guo,Huachao Li,Guofeng Qiu,Yan Li,Yanjie Niu,Jie Xu,Wenke Jia,Yixin Zhang,Jianjun Wu,Fanhui Guo
The separation of carbon-mineral components in coal gasification fine slag (CGFS) is an important prerequisite for achieving large-scale utilization of the CGFS resources. This study aims to reveal the influence of three physical separation methods on the distribution features, occurrence modes, and environmental risk of typical heavy metals (i.e., V, Cr, Mn, Ni, Cu, Zn, Ba, and Pb) in the CGFS. The results show that all three physical separation methods can separate carbon-rich or mineral-rich fractions from the CGFS at different enrichment levels. Thereinto, froth flotation has a high balance between high yields and excellent separation performance. Furtherly, Ni, Cu, Zn, and Pb are more concentrated in the two carbon-rich fractions obtained by froth flotation while other heavy metals are mostly enriched in the mineral-rich fractions. Density separation is possible to obtain carbon-rich fractions with a fairly high fixed carbon content (68.29 %, dry basis). In addition, a rough separation of the carbon-mineral fractions in CGFS can be performed by particle size classification. The various concentrations and distribution features of typical heavy metals in different separated products are associated with their specific structures. The carbon particles derived through the froth flotation have a higher specific surface area than those produced from the density separation and size classification. It is found a high correlation between mineral content and typical heavy metal concentrations, while porous carbon particles with a high specific surface area and particle size effect could reduce the dependence of some heavy metals (e.g., semi-volatile or volatile heavy metals Ni, Cu, Zn, and Pb) concentrations on mineral content. In addition, the typical heavy metals in separated fractions with a high content carbon particles as well as small-sized particles tend to have a high proportion of mobile fractions. Moreover, the eco-risk assessment code (RAC) analysis results indicate that priority attention should be given to the potential environmental impacts of Mn, Ni, Cu, Ba, and especially Zn in high-carbon content products and small-sized fractions during their resource utilization process.
研究领域:
环境科学
·
资源与材料工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2023
·Vol. 10
·期 9
·095301
·
IF 2.3
Kangli Li,Yanhua Teng,Kerui Wang,Long Chen,Changguo Xue
To facilitate the high-value utilization of activate coal gasification fine slag (CGFS), a wet mechanical activation process was used. As a result of this treatment, CGFS samples with different particle size distributions were obtained. The effects of mechanical activation on various physical and chemical properties of CGFS were investigated, including its particle size distribution, mineral composition, specific surface area, pore size, crystallinity, particle morphology, chemical bonding, and binding energy. Poly(vinyl chloride) (PVC)/CGFS composites were prepared via a melt blending process, and their mechanical and thermal properties were evaluated. It was found that with increasing levels of mechanical activation, the CGFS particle size distribution became more concentrated and the particle spacing became more uniform. With the increasing mechanical activation, the crystallinity was found to decrease and the content of amorphous mineral matter (such as SiO2 and Al2O3) increased. The observed increase in specific surface area and decrease in average pore diameter due to the mechanical activation was seen to lead to an increase in the number of active sites. The produced PVC/CGFS composite materials were found to exhibit good mechanical properties and dynamic thermal stability. The thermal stability of the PVC composites was also found to improve relative to the composites produced without the use of mechanical activation.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Dandan Zhu,Jing Zuo,Yinshan Jiang,Jinyi Zhang,Jiupeng Zhang,Cundi Wei
Coal gasification fine slag (CGFS) was produced in the coal gasification process which was classified as an industrial solid waste. It was featured with naturally formed amorphous structures and an abundance of silicon, carbon and metal oxides . In this study, on the basis of the composition and structure characteristics of CGFS, a simple hydrochloric acid (HCl) leaching technology was applied to in situ prepare carbon-silica mesoporous composites (CSMCs) from CGFS by fully considering the value of the residual carbon. Special focus was put on the novel mechanism of pore formation in amorphous silica glass microspheres (SGM) during acid leaching. Experimental evidences showed that the metal oxides were uniformly distributed in SGM thus the dissolution of the metal oxides were starting from the surface of SGM, then gradually extending to the interior, and finally leading to form “tree branch” mesoporous channels. In addition, a response surface method was used to predict the optimal reaction conditions and the optimal sample (named as CGFS-O) was successfully prepared. CGFS-O possessed a prominent specific surface area (SSA) (337.51 m 2 /g) as well as an excellent pore volume (0.341 cm 3 /g). CGFS-O also exhibited a desirable capacity for NO 3 − removing and the adsorption process was studied detailed by changing different adsorption conditions. Adsorption results proved that CSMCs have the potential to purify wastewater in an economically and environmentally way. Therefore, combined with a proof-of-concept adsorption performance experiment, our study has not only provided a cost-effective strategy to industrially prepare CSMCs, reutilizing CGFS in an environmentally friendly way, but also contributed to the future applications of CSMCs with valuable insights into the pore formation mechanism in SGM during acid leaching process.
研究领域:
环境科学
·
材料科学
✓ 已验证
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）