Applied Sciences-Basel
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2021
·Vol. 11
·期 19
·9127
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IF 2.679
Tianji Liu,Yitong Wang,Junguo Li,Qing Yu,Xiaoman Wang,Di Gao,Fuping Wang,Shuang Cai,Yanan Zeng
The effects of Ca2+in converter slag and electric arc furnace slag leaching solutions on CO2content, the effects of CO2content in solutions on the accumulation of chlorophyll a ofNannochloropsissp., and the mechanisms were studied. Results showed that addition of 50 mg/L converter slag leaching solution and 400 mg/L electric arc furnace slag leaching solution (lower than 50 vol% concentration) promoted the accumulation of chlorophyll a ofNannochloropsissp., while an increased concentration of 70 vol% inhibited its accumulation. The highest concentration of chlorophyll a was obtained on the addition of 10 vol%. With 10 vol% leaching solutions added, chlorophyll a concentration for converter slag reached 4.2 mg/L, 1.45 times as much as that of pure F/2 medium, and chlorophyll a concentration for electric arc slag reached 3.2 mg/L, 1.10 times as much as that of pure F/2 medium. Under the same addition proportion, the promoting or inhibiting effect from converter slag on the accumulation of chlorophyll a ofNannochloropsissp. was more obvious than that for electric arc furnace slag. The reason for the promotion of chlorophyll a accumulation ofNannochloropsissp. was that an increase of Ca2+in the solutions led to an increase of CO2, thereby promoting the photosynthetic rate of microalgae. The study provided new ideas for the green application of solid waste and industrial production of microalgae.Keywords:leaching solutions;converter slag;electric arc furnace slag;Nannochloropsissp.;chlorophyll a;CO2content
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xin Yang,Caixia Yue,Yahui Wang,Jiancheng Wang,Liping Chang,Weiren Bao
Although coal gasification is recognized as a core technology for clean coal utilization, S and Hg can migrate to gas, wastewater, and slag during the gasification process, causing environmental pollution. It is well known that S and Hg have a strong affinity. Therefore, the interaction between S and Hg during the gasification process warrants further investigation. In this study, the occurrence modes and distribution characteristics of S and Hg in gasification slag were systematically investigated using multiple treatments and various characterization techniques. The results showed that sulfur in the gasification slag exists predominantly as organic sulfur, while mercury mainly exists as HgS/silicate-bound Hg. Although the relative enrichment index of Hg (RE < 0.7) indicates its high volatility, a more pronounced enrichment effect for mercury of fine slag was indicated by its much higher RE than coarse slag. When exploring the relationship among the contents of C, S, and Hg and specific surface area in gasification slag, it was found that the correlation between S and Hg content in fine slag was the strongest, with a correlation coefficient (R 2 ) of 0.96, indicating a significant influence of sulfur content in fine slag on mercury content. Additionally, it was observed that the S and Hg contents in gasification slag increased with the decrease of particle size and density. These results provide an important understanding of the distribution, migration, and transformation behavior of S and Hg during coal gasification, as well as a certain theoretical support and technical basis for the resource utilization of gasification slag.
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
Journal of Cleaner Production
·
2025
·
IF 10
Jialin Chen,Jingfei Zhou,Shoukai Chen,Haibo Shi,Qingfeng Hu,Yingdong Tang
It is anticipated that this would address the underlying reasons of the disposal challenges and associated safety hazards if Cr-containing tannery waste from the tannery industry could be produced into stabilized sustainable construction materials. In this paper, the geopolymer was prepared employing solid waste furnace slag (FS) and tannery sludge powder (TSP) and evaluated for mass loss rate, appearance, residual compressive strength, pore properties, phase transformation and Cr leaching behavior after different thermal exposure (200 °C, 400 °C, 600 °C, 800 °C, and 1000 °C) for 2 h. The results revealed that the compressive strength increased and then dropped with increasing thermal exposure temperature, with the residual compressive strength of geopolymer being the maximum (63.00 MPa) at 200 °C. Dehydroxylation and phase transition disrupted the pore structure, and the hydration products, mostly C-(A)-S-H, underwent depolymerization and repolymerization to create new crystalline phases including akermanite and gehlenite. Even at 600 °C, which has the greatest impact on the safety of geopolymers, the leaching concentrations of total Cr and Cr (Ⅵ) were only 1.39 mg/L and 0.074 mg/L, respectively, which were still far below the standard requirements. The possible Stabilization-Migration-Restabilization (SMR) route of Cr was identified as follows: Cr was physically encapsulated by C-(A)-S-H at 20 °C–400 °C; C-(A)-S-H was destroyed at 600 °C–800 °C, and Cr migrated and was oxidized to Cr (Ⅵ) by CaO; it was then probably reduced to Cr(V) by heat and Mg-O at 1000 °C and finally immobilized in akermanite by chemical bonding.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Carbon Neutralization
·
2024
·
IF 0
Hua-Wei Guo,Ya-Jun Wang,Huan Liu,Ya-Nan Zeng,Wei-Jie Wang,Tian-Ji Liu,Le-Le Kang,Rui Ji,Yi-Tong Wang,Jun-Guo Li,Zhen Fang
Metallurgical slag such as solid waste generated in the steel industry carries environmental pollution risks, but it is rich in nutrients required by microalgae. Metallurgical slag used for carbon capture and biomass energy conversion has multiple benefits: (i) reduction and harmless treatment of metallurgical solid waste, (ii) assisting in carbon neutrality by efficient carbon fixation, and (iii) production of biodiesel from CO 2 . In this study, AOD, BOF, BFS, HVS, and VTS slag were applied to culture Chlorella pyrenoidosa ( C. pyrenoidosa ) with the regulation of growth, carbon fixation, and lipid synthesis. An excellent fixed amount of CO 2 with 94.59 mg is obtained from C. pyrenoidosa biomass at BOF slag added (mass ratio of CO 2 captured/microalgae/slag with 1.99/1.00/10.53) since high Ca/Mg mass ratio of 419 (8.38 mg/L Ca and 0.02 mg/L Mg), no Cr and low concentration of Al (0.04 mg/L) contribute to regulating antioxidant enzyme activity (SOD and POD) to resist ROS and improving PEPC activity to reduce carbon flux toward lipid to promote biomass synthesis. Both metal concentrations from Ca (5.86 mg/L), Mg (0.05 mg/L), Al (0.42 mg/L), and Cr (0.006 mg/L) and suitable pH (10.53) in AOD leaching solution at solid/liquid ratio of 0.5 g/L change carbon flow toward efficient lipid synthesis (47.07 wt%) by continuously providing raw materials and energy by regulating ACC, ME, and PEPC activities. High value-added biodiesel with high concentrations of C16 and C18 methyl esters from lipid of C. pyrenoidosa is achieved, following other ecological and economic benefits including 197 mg CO 2 captured and 2198 mg AOD applied with harmless. In this study, C. pyrenoidosa is cultured with elements from metallurgical slag solid waste, which promotes C. pyrenoidosa efficient carbon fixation to assist in carbon neutrality, and provides guidance for CO 2 conversion to high-value-added products with low cost.
研究领域:
环境科学
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能源工程
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生物技术
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材料科学
✓ 已验证
DOI
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Manjun Deng,Xuejiang Wang,Yuan Li,Fei Wang,Zhuwu Jiang,Yiyang Liu,Zaoli Gu,Siqing Xia,Jianfu Zhao
In this study, an industrial waste-blast furnace slag (BFS) supported sulfidized nanoscale zerovalent iron (S-nZVI@BFS) was prepared and used for synergistic reduction and adsorptive removal of Cr(VI) from aqueous solutions. The characterization analysis showed that Fe 0 and FeS were well dispersed on the surface of BFS, and the specific surface area of S-nZVI@BFS was 141.986 m 2 g −1 . Batch experiments demonstrated that the removal capacity of Cr(VI) was as high as 184 mg/g for S-nZVI@BFS. The pseudo-second-order kinetic model fitted the Cr(VI) removal kinetics well. Cr(VI) removal on the S-nZVI@BFS relied highly on pH values. The reduced Cr(VI) precipitated on S-nZVI@BFS mainly as Cr x Fe (1-x) (OH) 3 , Cr x Fe (1-x) OOH and Cr 2 S 3 , and the alkaline capacity of the BFS could efficiently prevent the release of Cr(III) from the precipitations in acid condition. Thus, supporting S-nZVI on BFS was an effective and safe method for Cr(VI) removal from aqueous solutions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
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2020
·
IF 5.778
Jie Wu,Jing Li,Feng Rao,Wanzhong Yin
The present work studies consolidation of phosphate mine tailings through alkaline activation process with the addition of slag for adjusting the gel structure. As increasing slag contents in the raw materials, more (Na,K) 2 O–CaO–Al 2 O 3 –SiO 2 –H 2 O (C-A-S-H) and (Na,K) 2 O–Al 2 O 3 –SiO 2 –H 2 O (N-A-S-H) gels were formed in the mine tailings-based mortars. Compressive strength of the mortars increased as increasing the slag contents from 0 to 40%, and then it kept a plateau. Evolution in microstructure of these mortars were characterized through scanning electron microscopy (SEM), X-ray diffraction (XRD) and nuclear magnetic resonance (NMR) measurements. The study provides fundamentals for the co-disposal of phosphate mine tailings with blast furnace slag through alkaline activation process.
研究领域:
建筑材料学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Case Studies in Thermal Engineering
·
2025
·
IF 6.4
Junjie Wu,Junsheng Hou,Li Ma,Lei Huang,Zihan Ding,Hao Zhang,Baiqi Tian,Wenjing Zhou,Zhenzhen Chen,Nanjing Hao
With the development of the coal chemical industry, the production of coal gasification slag (CGS) is increasing, and the utilization is becoming challenging. Products of CGS utilization mainly include activated carbon, zeolites, silicon-carbon composites. However, the consumption of these products above is limited, which is insufficient to utilize the output thoroughly. As a result, it is urgent to expand the application area for large-scale and high-value utilization of CGS. CGS is rich in elements including aluminum and calcium, presenting a promising material for synthesizing nanofluids, which is promising for the thermal management of microelectronic devices. This study synthesizes hydrocalumite nanofluids from CGS and applies the nanofluids for flow boiling heat transfer experiment. Nanofluids with an average particle size of 50 nm are synthesized and applied to flow boiling heat transfer experiments. The critical heat flux (CHF) and the heat transfer coefficient (HTC) are improved by a maximum of 43 % and 52 %. Moreover, the fundamental principle of enhancement is discussed. Improved wettability, delayed bubble coalescence, additional nucleation sites are attributed to the improvement. This study not only presents a novel method for high-value utilization of CGS but also introduces a potential approach for thermal management enhancement of microelectronic devices.
研究领域:
材料科学
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能源工程
·
电子器件热管理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Jiaqi Zhu,Chang Chen,Xufu Wang,Shaowu Jiu,Yanxin Chen,Yan Liu
Rock wool, as an external wall insulation material, is crucial in improving the energy efficiency of structures. However, a large amount of rock wool furnace slag (RWFS) generated during the production of rock wool panels manufacturing causes environmental problems. To address these issues, this study focuses on the use of waste RWFS as a precursor in alkali-activated cementitious materials. In addition, the effect of anatase nano-TiO 2 (ANT) and rutile nano-TiO 2 (RNT) as an additive to the alkali-activated rock wool furnace slag cementitious materials (AARWFSCMs) was evaluated and quantified. Scanning Electronic Microscope (SEM), Isothermal Conduction Calorimetry (ICC), Fourier-Transform Infrared Spectroscopy (FT-IR), X-ray diffraction (XRD) analysis were used to identify the effects of modulus 1.0–1.8 water glass modulus (Ms; SiO 2 /Na 2 O), 3%–7% Na 2 O content on AARWFSCMs. Experimental tests was conducted to quantify the properties such as the setting time, the fluidity, the compressive strength of AARWFSCMs after hardening. Results found that the optimal content of Ms, Na 2 O content in preparing AARWFSCM were 1.4, 5 % for obtaining 28-d compressive strength of 96.36 MPa. The atomic percentage of Ca/Si of the hydration products in the AARWFSCMs fluctuated within 0.94–1.50. The hydration products were a mixture of C–S–H and C–A–S–H. Moreover, the experimental results illustrated that the nano-TiO 2 , which highly beneficial in improving the compressive strength of AARWFSCMs. The additions of 0.50 % ANT and 0.75 % RNT resulted in increments of 5.9 % and 12.8 % in the 28-d compressive strength of AARWFSCMs, respectively. The obtained results provide a new method of utilization of RWFS and improving the sustainability of the construction industry.
研究领域:
建筑材料学
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环境科学
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2024
·
IF 2.4
Chen Mao,Dong Xiaosen,Pu Shuiqiang,Tang Wenbo,Zheng Kui
Na 2 O and K 2 O alkaline oxide capacities of TiO 2 -bearing blast furnace slags are critical values for vanadium titanomagnetite blast furnace operation. In this study, high-temperature experiments with fast-quenching were conducted to investigate the effects of TiO 2 concentration, basicity, MgO and Al 2 O 3 concentrations on Na 2 O and K 2 O concentrations in the TiO 2 -bearing blast furnace slags. The results were correlated with optical basicity and also compared with the plant data from one commercial vanadium titanomagnetite blast furnace.
研究领域:
冶金工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Haofei Ma,Ziqi Wang,Peng Yuan,Boxiong Shen,Jie Xu
Since the yield of titanium-bearing blast furnace slag (TF) during the smelting of vanadium titanium magnetite is large, it is urgent to find ways to recycle it and implement its value-added utilization. In this study, a perovskite-rich photocatalyst was prepared by acid-washing of TF, and then Ce was doped to modify it for photocatalytic removal of gaseous toluene under the irradiation of visible light. XRD, XRF and XPS analyses demonstrated that the perovskite phase was enriched after the acid-washing, and the content of CaTiO 3 in the acid-washed slag (AS) also increased after Ce doping. The combined N 2 adsorption-desorption, UV Vis DRS, EIS, PL , and ESR analysis results indicated that the photocatalytic performance of the mentioned photocatalyst was related to the Ce dopant content. The AS doped with 20% Ce (20% Ce-AS) had a lower band gap and larger specific surface area than the others catalysts. Under visible light radiation , more active radicals were produced, and the removal efficiency of toluene reached 92.08% for 20% Ce-AS. In addition, the results of the in situ DRIFTS tests indicated that toluene was gradually degraded by the Ce-doped perovskite-type photocatalyst to alcohols and aldehydes and mineralized to H 2 O and CO 2 . This study is expected to provide a new approach for the technical development of the value-added utilization of TF coupled with the efficient removal of toluene.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT & CONCRETE COMPOSITES
·
2022
·
IF 9.93
Jun Jiang,Xiaolei Lu,Teng Niu,Yueyang Hu,Jiaming Wu,Wenyu Cui,Degang Zhao,Zhengmao Ye
Basic oxygen furnace (BOF) slag, a by-product of the steelmaking process , has never been effectively utilised owing to its various drawbacks. In this study, BOF slag was used as the calcareous raw material of autoclaved aerated concrete (AAC) to successfully and completely replace lime with BOF slag. Moreover, the slurry was regulated with NaOH and a thickening agent, successfully reducing bulk density from the B07 level to the B05 level without reducing mechanical performance. The reaction products of AAC were analysed using X-ray diffraction and scanning electron microscopy. The results demonstrate that the addition of BOF slag can hinder the formation of xonotlite which offsets the other negative effects of BOF slag to a certain extent. In addition, kirschsteinite and part of C 2 F were involved in generating tobermorite during the autoclaving process.
研究领域:
材料科学
·
建筑工程
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Huangyu Yan,Guojie Zhang,Ying Wang,Jun Liu,Guoqiang Li,Yuqiong Zhao,Ying Xu,Yongkang Lv
The low-cost of CO 2 adsorbent is crucial for realistic CO 2 adsorption application. In this paper, a series of green CO 2 adsorbents were prepared using tetraethylenepentamine (TEPA) functionalized blast furnace slag (BFS) as raw materials, which not only implemented the recycling of blast furnace slag solid waste, but also realized the low cost of amine adsorbents. A series of characterization analyses were performed on the synthesized hydrotalcite-like and hydrated calcium silicate green support materials. The effects of structures, TEPA loadings and adsorption temperatures on the material properties were investigated. The result shows that BFS10.5-50TEPA with more pores is an ideal adsorbent, its optimum adsorption capacity for CO 2 is 5.64 mmol/g at 80 ℃, and the amine efficiency is as high as 38.42 %. According to CO 2 -TPD analysis, the dominant CO 2 adsorption mechanism of BFS10.5-50TEPA were physisorption and weak chemisorption. Moreover, the adsorption kinetics and regeneration performances also studied. The results indicate that pseudo-first-order model and pseudo-second-order model are both not accurately at predicting experimental results, while the Avrami model can accurately predict the adsorption kinetics of CO 2 at both low adsorption temperature and high adsorption temperature. After 10 adsorption-desorption recycles, the CO 2 adsorption capacity of BFS10.5-50TEPA still maintain 5.02 mmol/g. This study provides a novel method for the preparation of solid amine adsorbents with high adsorption performance from low-cost solid waste.
研究领域:
环境科学
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材料科学
✓ 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）