Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jianle Wang,Xueming Liu,Hong Deng,Dongye Zhao,Qiulin Yang,Zhihua Zhu
Various sulfur- and iron-bearing materials have been shown promising for reductive immobilization of Cr(VI) in water and soil. Yet, composite Ca-Fe-S materials and the effects of water chemistry and material aging have not been investigated. In this work, we prepared a type of Ca-Fe-S microparticles under the atmospheric conditions through a facile one-pot approach, and tested the particles for reductive immobilization of Cr(VI) in solution and soil. Ca-Fe-S showed 40 % higher removal efficiency of Cr(VI) in solution than FeSO 4 and 10 % higher than CaS x on the basis of equal molar dosage. When a Cr-laden soil was amended by Ca-Fe-S, the leachable concentration of Cr per the toxicity characteristic leaching procedure remained below the regulatory limit of 5 mg L −1 after 730 days of curing, while FeSO 4 and CaS x failed to meet the regulatory threshold. Ca-Fe-S served as a slow-releasing source of Fe 2+ and S 2- , which were able to convert Cr(VI) into the stable final product of Cr(OH) 3 . Ca-Fe-S was able to perform well under a wide range of pH (3.0–9.0) and in the presence of high concentrations of coexisting ions (5 mmol L −1 of Cl - , SO 4 2- , or HCO 3 - ). Moreover, the material remained effective when aged under the atmospheric conditions for 14 days. This study showed that Ca-Fe-S is a highly effective material for efficient sequestration of Cr(VI) in soil and groundwater under various water chemistry and materials aging conditions.
研究领域:
环境科学
·
土壤化学
·
地下水污染治理
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Guozhang Chang,Shanshan Dai,Huifen Kang,Jie Li,Yong Liu,Jian Zhang,Qingjie Guo
Limited knowledge regarding the controlled preparation of aromatic hydrocarbons (AHs) via catalytic pyrolysis of individual organic components hinders high yields of lignocellulosic biomass-based AHs. This report describes a systematic investigation of AHs generation following catalytic pyrolysis of organic components referring to cellulose, xylan, and lignin. Results show that in a programmed-heating process (20 °C/min), a (Ca-Fe)/HZSM-5 catalyst promoted the degradation of cellulose, xylan, and lignin with respective increment ratios of 24.56 %, 17.29 % and 19.45 %, and significantly increased the release of benzene during the pyrolysis of cellulose and xylan. In a fast-heating process (20 °C/ms), Ca-Fe alone presented a positive effect on bio-oil yield from cellulose, whereas HZSM-5 and (Ca-Fe)/HZSM-5 afforded high bio-oil yields from all three components. Notably, Ca-Fe and HZSM-5 exhibited synergistic effects on the bio-oil and AHs yields following cellulose pyrolysis, and on AHs yield following xylan pyrolysis. Alcohols, aldehydes, and furans were suitable precursors for generating AHs via pyrolysis of both cellulose and xylan. Lignin conversion to AHs involved various potential reaction pathways, including dehydration-deoxygenation-aromatization and dehydration-hydrodeoxygenation. The orders of (Ca-Fe)/HZSM-5 catalyzed pyrolysis of individual components towards AHs generation were xylan > cellulose > lignin. The presence of Ca-Fe particles inhibited deactivation of HZSM-5 in pyrolysis of a cellulose/xylan/lignin mixture.
研究领域:
能源植物学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 3
·1019-1032
·
IF 1.371
Wang Yugang,Zhang Weimin,Chen Jiahong,Guo Yadan
A new type of Ca/Fe-phosphate composite CFP(CN) was prepared by a sol–gel method. The effects of pH, reaction time, initial uranium concentration, reaction temperature, and Mn(II) selective adsorption were investigated by static batch experiments. The adsorption process of CFP(CN) on U(VI) was in line with the quasi-second-order kinetic model and the Langmuir adsorption isotherm model. The results of thermodynamic analysis show that the adsorption of U(VI) by CFP(CN) is a spontaneous process with heat absorption and entropy increase. The adsorption mechanism of U(VI) on CFP(CN) was investigated by SEM, XRD and FT-IR.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 12
·1-12
·
IF 3.8
Zhang Ge,Yang Huifen,Lin Xingjie,Miao Yu,Zhang Chi,Li Fangze,Pang Zhikun,Xin Xin
In this work, a novel Ca-Fe-Si-S composite was prepared from thermal desorption residue through FeSO 4 impregnation-pyrolysis. The characteristics and modification process of the composite were specified through a series of analytical methods. And stabilization experiments were conducted to investigate the performance of prepared materials. The optimal Ca–Fe–Si–S composite was obtained at impregnation ratio of 10%, pyrolysis temperature of 900℃ and pyrolysis time of 60 min. The modification process included the dissolution of calcium hydroxide, the formation of gypsum and ferrous silicate, the dehydration of gypsum, the reduction decomposition of calcium sulfate, the decomposition of calcium carbonate and the solid reaction at high temperature. The obtained optimal Ca–Fe–Si–S composite was a multifunctional material mainly composed of high contents of Ca, Fe, Si, S, which corresponding to FeS, CaS, Ca 2 SiO 4 , Ca 3 Al 2 (SiO 4 ) 3 , Ca 3 Fe 2 (SiO 4 ) 3 , Ca 5 (SiO 4 ) 2 SO 4 . The application of 5% optimal Ca–Fe–Si–S composite successfully lowed the leaching concentrations of As, Zn, Cu, Cd in arsenic slag to meet the discharging standard. Meanwhile, the non-specifically bound and specifically bound of As totally decreased by 3.72%, and the acid extractable species of Zn, Cu, Cd reduced by 11.20%, 29.37%, 2.76% respectively. The distribution of stable species for heavy metals significantly increased as united results of surface complexation, chemical precipitation and ion/anion exchange reactions between the prepared composite and heavy metals. The findings of this research provide an effective material for the simultaneous stabilization of multiple heavy metals.
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·54556-54567
·
IF 5.8
Zhang Ge,Yang Huifen,Li Xuan,Zhou Yichen,Guo Song,Zhao Tong
The control of multiple heavy metals (HMs) pollution in solid wastes, especially the co-contamination of As and other heavy metal cations, is of great importance to ecological and environmental health. To address this problem, the preparation and application of multifunctional materials have attracted wide attention. In this work, a novel Ca-Fe-Si-S composite (CFSS) was applied to stabilize As, Zn, Cu, and Cd in acid arsenic slag (ASS). The CFSS exhibited synchronous stabilization ability for As, Zn, Cu, Cd and owned strong acid neutralization capacity. Under simulated field conditions, the acid rain extracted HMs in ASS successfully decreased below the emission standard (GB 3838–2002-IV category in China) after incubated by 5% CFSS for 90 days. Meanwhile, the application of CFSS promoted the transformation of leachable HMs into less accessible forms, which was conductive to the long-term stabilization for HMs. There was competitive relation among the three heavy metal cations, following the stabilization sequence of Cu > Zn > Cd during incubation. And the stabilization mechanisms of HMs by CFSS were proposed as chemical precipitation, surface complexation, and ion/anion exchange. The research will be greatly conducive to the remediation and governance of field multiple HMs contaminated sites.
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yihong Wu,Lei Song,Maofeng Shi,Chuhan Gu,Jiaxian Zhang,Jingyu Lv,Lili Xuan
Despite the strict management of eutrophic waters globally, the release of phosphorus (P) from sediments maintains the eutrophic state of water bodies and poses a serious challenge to their management. Ca/Fe–LDH was synthesized with natural zeolite (NZ) by using a co-precipitation method (denoted as CFL-Z) to solve this problem. Results showed that Ca/Fe–LDH was successfully loaded onto the surface and inside the pores of NZ. The maximum P adsorption capacity value of CFL-Z was 46.7 mg/g under the mechanisms of electrostatic attraction, ligand exchange, and ion exchange. In incubation experiments, the addition of 6 % CFL-Z into P-contaminated sediments reduced P concentrations in overlying and interstitial water to 0.013 (97.3 % reduction) and 0.358 (82.1 % reduction) mg/L, respectively. In addition, unstable P forms (NH 4 Cl-P and BD-P) in sediments were converted into stable P forms (HCl-P and Res-P, respectively). Subsequent long-term anoxic experiments showed that CFL-Z capping sediments exhibited better inhibition of sediment P release compared with CFL-Z amendment sediments and was efficient and stable. Microbial community analysis showed that CFL-Z amendment and capping reshaped the microbial community structure, and different functional bacteria influenced the stability of sediment P. This work showed that CFL-Z overlays were considered to have potential applications in sediment P fixation, providing a new way to improve the P-binding capacity of natural mineral-like materials and resolve P-contaminated sediments.
研究领域:
环境科学
·
生态学
·
微生物学
✓ 已验证
DOI
高影响因子
ENERGY
·
2021
·
IF 7.147
Genyang Tang,Jing Gu,Zhen Huang,Haoran Yuan,Yong Chen
Biomass-derived chemical looping gasification (BCLG) is a novel technology for lignocellulose energy applications . Ca–Fe oxygen carriers have been proven to be a potential material for efficient lignocellulose conversion and hydrogen-enriched syngas production in process studies. In this study, Thermogravimetry-mass spectrometry (TG-MS), pyrolysis chromatography-mass spectrometry (Py-GC-MS) and fixed-bed experiments were conducted, and the cellulose BCLG product was analyzed to explore the mechanism of reaction between Ca–Fe OCs and biomass char or volatiles. The mechanism of the synergistic effect of Ca–Fe was analyzed to explain the characteristics of the OCs. The results suggest the Ca-based materials act as catalysts to promote the decomposition of cellulose monomers at primary reaction and char at secondary reaction, and also promote the reforming and oxidation of volatiles by chemisorption . Ca participates in the construction of inert substances, such as Ca 2 Fe 2 O 5 , to avoid the deep oxidation of CO and H 2 . Fe-based material supplies oxygen and promotes the reforming of volatile. Compared with Fe 2 O 3 and CaO/Fe 2 O 3 , CaFe 2 O 4 shows a better performance on carbon conversion and H 2 production below 850 °C.
研究领域:
能源工程
·
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yuhang Li,Rui Cai,Kang Chen,Yujing Zhang,Xu Chen,Bo Sun,Yu Jiang,Chaochao Tan,Chuang Peng,Yinghui Song,Ling Wu,Sulai Liu
Severe acute pancreatitis (SAP) is a serious inflammatory disease that is often associated with high mortality rate. It tends to trigger a cascade of systemic inflammation that causes damage to multiple organs, such as the lungs and kidneys. Currently, there is no effective treatment plan to reverse the progress of SAP. The occurrence and development of SAP are associated with oxidative stress (OS) and ferroptosis. In this study, the Ca/Fe-based nanozymes are used as multi-enzyme simulants, which can effectively remove the reactive oxygen species and regulate ferroptosis to prevent and treat SAP. Notably, we make two trials for prevention and treatment of SAP. Under the condition of good biocompatibility, the Ca/Fe-based nanozymes effectively reduce the levels of serum pancreatitis-related biomarkers and inflammatory factors which involved in local and systemic inflammatory response. Moreover, the Ca/Fe nanozymes significantly increase the level of ferroptosis regulator of glutathione peroxidase 4 (GPx4) and ferritin heavy chain 1 (FTH1) in pancreas. These results demonstrate that the Ca/Fe-based nanozymes not only alleviate SAP but also mitigate subsequent multi-organ damage, thus providing an effective strategy of Ca/Fe nanozymes for treating SAP-related disorders in clinical research.
研究领域:
纳米技术
·
药理学
·
炎症
·
氧化应激
·
胰腺疾病
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Iwei Wang,Hailiang Nie,Yongliang Yan,Manyi Cai,Hui Zhou,Yongqing Xu,Yi Xing,Hongzhi Ma
Reconstructing dual functional materials (DFMs) from industrial waste such as steel slag offers a sustainable approach to mitigate environmental pollution while valorizing hazardous byproducts. Although the steel slag is rich in calcium and iron, its direct use is hindered by the formation of inactive solid solutions (e.g., Ca 2 Fe 2 O 5 , Ca 2 SiO 4 ), limiting CO 2 capture and conversion performance. In this study, we reconstruct steel slag into a high-performance DFM composed of CaO (adsorptive phase) and FeOx (catalytic phase) for integrated CO 2 capture and utilization (ICCU). The optimized DFM achieves a CO 2 uptake of 9.15 mmol g −1 , a CO yield of 7.80 mmol g −1 , 87 % CO 2 conversion, and 100 % CO selectivity at 650 °C, substantially outperforming the raw slag. Moreover, the DFM maintains outstanding cyclic stability over 10 cycles, with CO 2 uptake ranging from 8.25 to 10.38 mmol g −1 and CO yield from 6.90 to 8.25 mmol g −1 . In-situ XRD and DRIFTS analyses reveal a dual Fe-phase looping mechanism (Fe/FeO and Fe/Ca 2 Fe 2 O 5 ), and a formate-mediated hydrogenation pathway during in-situ CO 2 conversion. This work highlights the untapped potential of industrial waste for developing efficient, sustainable materials for integrated CO 2 capture and utilization.
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Kun Li,Luxin Liang,Peng Du,Zeyun Cai,Tao Xiang,Hiroyasu Kanetaka,Hong Wu,Guoqiang Xie
Magnesium (Mg) alloys can be regarded as the most promising biodegradable implant materials for orthopedic and stent applications due to their good biocompatibility and low Young's modulus which is near to that of natural bone. However, its applicability is hindered because it exhibits a high corrosion rate in the physiological environments. In this work, we fabricated Mg 66 Zn 30 Ca 4 /Fe bulk metallic glass composites via spark plasma sintering (SPS). We studied the influence of different contents of Fe on the properties of the composites. The results indicated that Fe was uniformly distributed on the surface of Mg 66 Zn 30 Ca 4 metallic glass (MG) as a second phase, which led to an improvement in the corrosion resistance and mechanical strength. The standard potential of Mg 66 Zn 30 Ca 4 /Fe bulk metallic glass (BMG) composites increased as compared to Mg 66 Zn 30 Ca 4 , while their mechanical strength improved from 355 MPa to 616 MPa. Furthermore, cytotoxicity was investigated via the CCK-8 assay and calcein-AM staining, which revealed that the extraction mediums diluted 6 times (EM × 6) of the Mg 66 Zn 30 Ca 4 and Mg 66 Zn 30 Ca 4 /Fe did not cause cell toxicity on day 3 and 5, while the EM × 6 of the Mg 66 Zn 30 Ca 4 showed cytotoxicity on day 1, 3 and 5. Thus, Mg 66 Zn 30 Ca 4 /Fe BMG composites exhibit significant potential for fabricating implants with good mechanical strength and corrosion resistance.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yunlei Zhao,Youyou Li,Bo Jin,Zhiwu Liang
As a powerful process intensification strategy, chemical looping shows a promising future to achieve an integrated CO 2 capture and utilization for reducing CO 2 emissions and energy-cost penalties. Herein, a bifunctional Ca-Fe-Mg material derived from layered double hydroxide (LDH) was synthesized and used in chemical looping reforming process for integrated CO 2 capture and utilization. Reactivity tests and detailed characterization techniques are performed to examine and explain the performance of this material. 900 °C is determined as a suitable reforming temperature, since more syngas production is obtained (2.5 times of at 800 °C). The presence of Ca induces a synergetic interaction between Ca and Fe to implement an enhanced performance of syngas contents and stable H 2 /CO ratio. The activity deactivation of the material derives from the phase transition of Ca 2 Fe 2 O 5 to MgFe 2 O 4 , crystal size variation and particle agglomeration. Compared to a reference coprecipitated material, LDH derived Ca-Fe-Mg material shows an enhanced syngas production, due to its highly dispersion of CO 2 sorption and reforming active sites. This work provides a new route to rationally design bifunctional material for integrated CO 2 capture and utilization.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Chenchen Zhao,Mengjie Wu,Meiju Li,Tianqi Wang,Ping Zhang,Yujie Li
Excessive phosphate discharge into aquatic systems drives eutrophication while depleting finite phosphorus resources. To address this dual challenge, a magnetic calcium/ferric hydroxide composite was developed via co-precipitation for efficient phosphate recovery. The optimized magnetic calcium/ferric hydroxide composite (Ca:Fe = 3:1) integrates CaFe-layered double hydroxide and Ca(OH) 2 , achieving a phosphate uptake capacity of 224.2 mg/g. Pseudo-second-order kinetics confirmed the chemisorption mechanism, and the Freundlich isotherm revealed a multilayer adsorption behavior. Thermodynamic analysis confirmed the exothermic nature of the process. The composite performed robustly across pH 2 - 12, in the presence of competing anions, and in real water matrices. Mechanism studies identified pH-dependent pathways: electrostatic attraction and ligand exchange on amorphous akageneite under pH<6; hydroxyapatite precipitation and ligand exchange with ferrihydrite at pH≥6. LDH facilitated uptake via ion exchange and self-assembly under high phosphate concentrations (≥600 mg/L) and strongly alkaline conditions (pH≥12). The material maintained its magnetic properties, enabling easy separation and reuse over five cycles with >90% performance retention. This work presents a high-capacity, recyclable adsorbent that supports both eutrophication control and resource recovery, while offering mechanistic insights for designing multifunctional metal-based adsorbents.
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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）