ADSORPTION SCIENCE & TECHNOLOGY
·
2018
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IF 0.609
Liyun Yang,Xiaoming Qian,Zhi Wang,Yuan Li,Hao Bai,Hong Li
This study investigates the removal effectiveness and characteristics of phenanthrene and naphthalene using low-cost steel slag with batch experiments. The adsorption characteristics of steel slag were measured and analysed using X-ray fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy. The batch experiments investigated the effect of the time gradient, pH, and steel slag dosage gradient on the adsorption of the steel slag. The results show that with time and dosage of steel slag increased, the adsorption capacity of phenanthrene and naphthalene increased and gradually became balanced, but pH had no obvious effect on the adsorption of phenanthrene and naphthalene. The Langmuir isotherm model best describes the phenanthrene and naphthalene removal by the steel slag, which shows the adsorption occurring in a monolayer. The maximum adsorption capacity of the steel slag to phenanthrene and naphthalene is 0.043 and 0.041 mg/g, respectively. A pseudo-first-order kinetic model can better represent the adsorption of phenanthrene and naphthalene by steel slag. The research demonstrates that the steel slag has a certain adsorption capacity for phenanthrene and naphthalene.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
JOM
·
2022
·Vol. 74
·期 5
·1958-1968
·
IF 2.597
Luo Yinbo,He Dongfeng
Indirect carbonation as an efficient CO 2 sequestration strategy has received extensive attention in recent years. This study proposes a two-step leaching indirect carbonation process using NH 4 Cl and CH 3 COOH in order to combine the advantages of the two leaching agents to obtain a better experimental outcome. The experimental results show that NH 4 Cl has a high pH buffering capacity, which can increase the pH of the mixed leachate to an alkaline level. Among the 21 groups of mixed leachate, 17 were alkaline (pH > 7). The mixed leachate has a high Ca 2+ ions carbonation rate under low CH 3 COOH concentration conditions, and the carbonation rate of steel slag with a particle size of < 38 μm can reach 60% when the CH 3 COOH concentration is 0.1 M. SEM imaging showed that the CaCO 3 formed by the reaction exists in a hexagonal calcite crystal form.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Qing Shao,Yiyi Yi,Yuxiang Xie,Haike Yang,Jingyi Guo,Zizheng Liu,Yiqun Chen,Jun Wan
The utilization of steel slag as an adsorbent for wastewater treatment (e.g., phosphorus removal) is a promising direction for the simultaneous disposal of solid waste and eutrophication control. In this study, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) was selected as a representative phosphonate and its adsorption performance and mechanism on steel slag were explored. The experiment results show that for the HEDP solution with a concentration of 0–50 mg/L, the removal efficiency of steel slag was 85–88% and the adsorption capacity was 0.0835–8.2793 mg-P/g. The HEDP adsorption behavior on steel slag conformed to the pseudo-second-order adsorption kinetics model. Both the Freundlich and Langmuir adsorption isotherm models can describe the experimental data well. And the theoretical maximum adsorption capacity at 25°C was calculated as 23.74 mg-P/g. Combined with our SEM, XRD, FTIR, and XPS analyses, the adsorption mechanism involved ligand exchange, hydrogen bond interaction, and electrostatic attraction. After 5 reuse cycles, the regeneration efficiency of steel slag remained 77% by using 1 mol/L NaOH. The research work in this paper proves that steel slag, as a solid waste with large emissions in China, can effectively remove HEDP, which supplies a new way for the resource utilization of steel slag.
研究领域:
环境科学
·
废水处理
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ting Shi,Mengxin Guo,Hongcheng Gao,Yi Wang,He Li,Mingming Wu,Dongyuan Cheng,Yi Han,Dejin Wang
Tetracycline as a common emerging pollutant has received widespread attention worldwide. In this paper, RMSSx:y composite pellets were prepared by an annealing process to adsorb tetracycline (TC) from wastewater using red mud (RM) and steel slag (SS) as raw materials. The RMSS5:5 composite pellets prepared with a mass ratio of 5:5 at a calcination temperature of 900 °C exhibited excellent adsorption properties. The experimental data were analyzed using Langmuir, Freundlich, and Temkin adsorption models. The equilibrium data fitted both the Langmuir and Freundlich models well. Kinetic adsorption data were analyzed using the quasi-primary kinetic model, the pseudo-secondary kinetic model, the intraparticle diffusion model, and the Boyd model. The maximum adsorption capacity of RMSS5:5 for TC reached 183.78 mg/g. Thermodynamic studies revealed the exothermic and spontaneous nature of the adsorption process. The adsorption mechanism involved the complexation of Fe, Ca with TC, hydrogen bonding, electrostatic interaction, and physisorption. In addition, RMSS5:5 possessed excellent magnetic responsive properties and cycling performance. This study successfully prepared an efficient and cost-effective adsorbent with two industrial solid wastes, which has great potential for TC removal from wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Building Engineering
·
2024
·
IF 6.7
Jinglong Huang,Yilian Li,Yunhua Zhang
In order to improve the carbonation properties of steel slag, the carbonation reaction process of steel slag and the formation of carbonation products were regulated by the interaction between multiple hydroxyl groups within β-cyclodextrin (β-CD) molecule and calcium ions leached from steel slag. Through a meticulous experimental design, varying contents of β-CD, from 0.0 % to 5.0 %, were mixed with steel slag to investigate their impact on carbonation kinetics, mechanical strength, and microstructural evolution. The results indicate that β-CD significantly accelerates the carbonation process of steel slag, with a particular boost to the carbonation of β-dicalcium silicate (β-C 2 S), a key mineral contributing to the carbonation activity. At an optimal β-CD concentration of 2.5 %, the compressive strength of the treated slag reached a peak of 138.5 MPa, marking a 13.4 % improvement over the control sample. Similarly, the CO 2 uptake was optimized at 17.9 %, increasing by 21.8 %. Mechanism analysis reveals that β-CD not only facilitates carbonation but also refines the resulting carbonation products, leading to a denser microstructure and enhanced mechanical properties. However, at a β-CD content of 5.0 %, the carbonation process was hindered by excessive viscosity. These pivotal findings propose an innovative strategy to augment the efficiency of carbonation and the inherent material properties of steel slag, thereby fostering a more sustainable approach to the utilization of industrial byproducts.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Lianghua Wang,Pingfeng Fu,Yanhong Ma,Xuejin Zhang,Yabao Zhang,Xiumin Yang
Flotation reagents and heavy metal ions always coexist in mineral flotation wastewaters, arousing serious environmental issues or having deleterious effects on mineral flotation. In this work, the steel slag was adopted as a cost-effective adsorbent to synergically remove butyl xanthate (BX), diethyl dithiocarbamate (DDTC), Cu(II) and Pb(II) ions. At the steel slag dosage of 12.0 g/L, Cu(II) and Pb(II) concentrations decreased from 4.0 mg/L to below 10.0 μg/L, and the removal of COD reached 54.33%. The removal efficiency of COD increased from 11.36% to 57.49% as Cu(II) and Pb(II) concentrations rose from 0 to 8.0 mg/L, revealing the promotion effects of metallic ions on collector adsorption. The maximum uptake capacity of steel slag reached 110.45 and 160.48 mg/g for Cu(II) and Pb(II), respectively. The collector adsorption capacity of steel slag increased nearly two magnitudes after modifying with the uptake of Cu(II) or Pb(II) ions. The SEM/EDS, XPS and FTIR analysis indicated that steel slag could be in-situ modified to generate copper or lead hydroxides and oxides during the removal of Cu(II) and Pb(II) ions. Subsequently, these precipitates acted as reactive sites for chelating BX and DDTC to form indissolvable metal-collector chelates. Owing to in-situ modification of steel slag by uptaking metallic ions, the adsorption was potentially feasible for treating flotation wastewaters.
研究领域:
环境科学
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矿物工程
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DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Jun Chang,Cang Xiong,Yangyang Zhang,Dan Wang
The present paper discusses investigated the foaming behaviors and microstructure of three aerated steel slag block (ASSB) samples prepared with three different foaming agents (namely animal protein, hydrogen peroxide, aluminum powder) and by accelerated carbonation. The composition and microstructure of the ASSB samples before and after accelerated carbonation were characterized using X-ray diffraction (XRD), Rietveld method, thermogravimetric analysis (TGA), fourier transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (FE-SEM). It is an advisable method for foamed steel slag products to use the aluminum powder and accelerated carbonation technology. The aluminum powder favored a good foaming behavior for steel slag owing to (i) a high porosity and low dry density, (ii) a high hydration degree of minerals in steel slag, including brownmillerite, larnite, and lime, which was confirmed by the analysis of mineral compositions using Rietveld method, and (iii) the interlaced lamellas of monocarboaluminate and calcium silicate hydrate (C-S-H) gel strengthen the bubbles wall, which was confirmed by morphology analysis using FE-SEM. After accelerated carbonation, the monocarboaluminate shifted to aragonite, vaterite, calcite and amorphous aluminum hydroxide (Al(OH) 3 ), which was confirmed by XRD, TGA and FT-IR. The network skeleton formed by aragonite crystals improved the compressive strength of ASSB prepared by aluminum powder. In addition, the reactions of the formation and carbonation of monocarboaluminate phase were proved to be thermodynamically possible in this work.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Yan Feng,Zhijie Zhang,Youheng Zhao,Liang Song,Xinwei Wang,Shumin Yang,Yingying Long,Chunhui Zhao,Liping Qiu
Electro-biological particle electrode (EPE) made from steel converter slag (SCS) was used as a particle electrode in an enlarged anode electric biological (EAEB) reactor for Rhodamine B (RhB) wastewater treatment, and its purification performance and microbial community were examined. The results revealed that (1) the EAEB reactor showed much higher average removal rates of RhB, COD and NH 4 + -N, i.e. 91.68%, 87.63%, and 90.54%, which meant an increase by 59.86%, 20.48%, and 14.22%, respectively, compared with BAF; (2) The optimum current intensity (CI) for simultaneously removing RhB, COD and NH 4 + -N in the EAEB reactor was at 1.00 A; and (3) Methylophilus, Aeromonas, Pseudomonas, Pelomonas and Zoogloea accounted for the main bacterial community in EAEB. Therefore, the EAEB reactor with EPE produced from steel converter slag (SCS) was suitable to simultaneously remove RhB, COD and NH 4 + -N.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
An Wang,Meiling Wu,Zhongyuan Li,Yuqiang Zhou,Zhanbin Huang
In this study, sulfuric acid modified steel slag (SS-HS) was prepared using a one-step hydrothermal synthesis method, utilizing converter steel slag as the raw material, to remove heavy metal Pb 2+ from water. Single-factor experiments were conducted to determine the influence of different factors on the adsorption capacity. The obtained material was characterized using EDS and FT-IR to analyze its composition. Response surface methodology was employed to optimize the preparation conditions of SS-HS, and the optimal conditions were determined as follows: sulfuric acid dosage of 8.07 mL, reaction time of 9.98 h, and reaction temperature of 99.44 ℃. SS-HS was prepared under the optimized conditions obtained from the response surface methodology. The physicochemical properties of the prepared SS-HS were analyzed using SEM , EDS, and BET. It was observed that the specific surface area of SS-HS increased from 8.0041 m 2 /g to 131.8312 m 2 /g. The average pore volume was 0.2101 cm 3 /g and the average pore size was 6.3737 nm for mesoporous material. Additionally, the influence of different adsorption conditions on the adsorption capacity of Pb 2+ was investigated. The optimum adsorption conditions reached the maximum adsorption amount of 193.05 mg/g at Pb 2+ solution concentration of 700 mg/L, adsorbent mass of 0.03 g, temperature of 55 °C, pH= 5. To further understand the adsorption process , kinetic and isotherm models were established. The results indicated that the adsorption process followed a pseudo-second-order kinetic model and Freundlich isotherm model, suggesting a monolayer chemical adsorption . XPS analysis was employed to determine the composition and valence state of the materials, confirming that the adsorption mechanism of SS-HS primarily involved electrostatic adsorption, ion and ligand exchange , and surface precipitation. This study not only introduces a novel approach for the resource utilization of steel slag but also presents an innovative adsorbent for efficient removal of Pb 2+ 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
高影响因子
Sustainable Energy Technologies and Assessments
·
2021
·
IF 5.353
Aixia Chen,Zheng Tian,Rong Han,Xiao Wei,Ruirui Hu,Yang Chen
In this study, a nickel (Ni)-based catalyst was loaded onto steel slag that was rich in metal oxides using impregnation method. The effects of the catalyst on hydrogen-rich gas produced using sludge steam gasification were discussed. Under the conditions of 900 ℃, steam flowrate of 1.5 g min −1 and 20% Ni-based loading rate, the gas and H 2 yield reached 0.78 Nm 3 kg −1 and 15.72 mol kg −1 . At this time, the volume fraction of H 2 was as high as 45.096%. Compared with the raw sludge gasification without Ni-based catalyst, the gas and H 2 yield were increased by 39.22% and 60.15% respectively. However, excessive flowrate of steam (≥1.5 g min −1 ) and excessive rate of loading of Ni-based (≥25%) catalyst would lead to a decrease in the production of gas. In addition, the impregnation method could effectively disperse NiO particles on the surface of the support, increasing the ratio of active sites on the surface of catalyst and improving the catalytic activity. These characteristics indicated that the Ni-based steel slag catalysts prepared by the impregnation method had high application potential in the process of sludge steam gasification, and provided a novel idea for solid wastes recycling.
研究领域:
环境科学
·
能源工程
·
催化化学
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产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 21
·3145
·
IF 3
Wei Wu,Yiming Nie,Zhixin Wang,Tianyin Huang,Xiaoyi Xu,Hanhan Liu,Peirong Li,Bingdang Wu
Organophosphates are a type of emerging environmental contaminant, which can be removed effectively by adsorption. Here, modified steel slag was examined for its adsorptive performance in the removal of hydroxyethylidene diphosphonic acid (HEDP) from water. Compared to acid (55.3%, maximum removal rate) and base (85.5%) modification, high-temperature modification (90.6%) significantly enhanced steel slag’s adsorption capacity for HEDP, surpassing that of unmodified slag (71.2%). Kinetic analyses elucidated a two-phase adsorption process—initial rapid adsorption followed by a slower equilibrium phase. The results of adsorption energy analysis showed that modified steel slag preferentially occupied the sites with higher energy, which promoted the adsorption. After five regeneration cycles, the adsorption properties of the material were not significantly reduced, which indicates that the material has good application potential. Microscopic and spectroscopic techniques, including SEM-EDS, FTIR, and XPS, were employed to uncover the surface chemistry and structural changes responsible for the enhanced adsorption efficiency. The adsorption mechanism of HEDP on steel slag is a complete process guided by hydrogen bonding interactions, strengthened surface complexation, and optimized ligand exchange. This study advances the sustainable utilization of industrial waste materials and contributes significantly to the development of innovative water treatment technologies.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Yizheng Zhang,Genshen Li,Saisai Zhang,Shuqiong Luo,Xuemao Guan,Jianping Zhu,Xiangming Zhou,Songhui Liu
This study investigates the enhancement of mechanical properties in carbonated steel slag through surfactant-assisted CaCO 3 crystallization. Sodium dodecyl benzene sulfonate (SDBS) was employed at various concentrations (0.1–0.4 mol/L) and temperatures (20–60 °C) to modulate the carbonation process. Optimal performance was achieved with 0.2 mol/L SDBS at 40 °C, resulting in a maximum CO 2 uptake of 8.51 % and a compressive strength of 62.89 MPa, 81.66 % higher than unmodified steel slag. Characterization techniques confirmed the formation of crystalline calcite, vaterite, and aragonite, contributing to improved microstructure and strength. SDBS micelles act as templates for CaCO 3 nucleation and growth, with low concentrations facilitating carbonation and high concentrations inhibiting it. This research offers new insights into surfactant-assisted crystallization for enhancing carbonated steel slag properties, paving the way for high-performance, eco-friendly building materials from industrial waste.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）