Materials
·
2021
·Vol. 14
·期 9
·2224
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IF 3.623
Xinzhe Sun,Peng Guo,Yuanyuan Sun,Yuqian Cui
Lanthanun oxide (La2O3) is a lanthanum chemical compound incorporates a sensible anionic complexing ability; however, it lacks stability at a low pH scale. Biochar fibers will give the benefit of their massive space and plethoric uses on the surface to support a metal chemical compound. Herein, wet spinning technology was used to load La3+onto sodium alginate fiber, and to convert La3+into La2O3through carbonization. The La2O3-modified biochar (La-BC) fiber was characterized by SEM, XRD and XPS, etc. An adsorption experiment proved that La-BC showed an excellent adsorption capacity for chromates, and its saturation adsorption capacity was about 104.9 mg/g. The information suggested that the adsorption was in step with both the Langmuir and Freundlich models, following pseudo-second-order surface assimilation mechanics, which showed that the Cr (VI) adsorption was characterized by single-phase and polyphase adsorption, mainly chemical adsorption. The thermodynamic parameters proved that the adsorption process was spontaneous and endothermic. The mechanistic investigation revealed that the mechanism of the adsorption of Cr (VI) by La-BC may include electrostatic interaction, ligand exchange, or complexation. Moreover, the co-existing anions and regeneration experiments proved that the La-BC is recyclable and has good prospects in the field of chrome-containing wastewater removal.Keywords:wet spinning;lanthanum oxide;biochar;chromate;adsorption
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Xinqian Li,Bo Li,Yaping Dong,Zhengrong Niu,Dandan Gao,Haitao Feng,Wu Li
How to effectively and environmentally purify chromate solutions containing impurities such as silicon and vanadium, and avoid the generation of Cr(VI)-containing residues are important issues to be solved urgently. Herein, a novel Cr 2 O 3 ∙2.7H 2 O adsorbent with stable three-dimensional nanoflower structure was fabricated using the hydrothermal method , which was successfully implemented in the removal of Si(IV) and V(V) from dichromate system. Batch adsorption experiments revealed that the saturated adsorption capacity of Si(IV) was 140.06 mg/g at pH 9 and 132.98 mg/g V(V) at pH 2. Furthermore, density functional theory (DFT) calculations revealed that V(V) anionic species exhibited high adsorption energies (−990.70 kJ/mol, −697.10 kJ/mol) and small adsorption distances from the β-CrOOH(012) (≈1.89 Å, 1.98 Å), verifying the selective adsorption of Cr 2 O 3 ∙2.7H 2 O on V(V) in Cr(VI)–Si(IV)–V(V) ternary systems . The integrated mechanisms of electrostatic interaction, coordination, polymerization and precipitation for the removal behaviors were proposed via FT-IR, XPS and DFT calculations. In the real Na 2 Cr 2 O 7 complex solutions, the simultaneous removal rates of 88.48% Si(IV) and 80% V(V) were achieved, with optimal adsorption conditions at a pH of 8 and a temperature of 333 K. Furthermore, the desorbed Cr 2 O 3 ∙2.7H 2 O can be effectively converted into high-value nano Cr 2 O 3 , indicating the potential of this new green adsorbent. Therefore, this study not only imparts theoretical and practical insights into the purification of chromate solutions but also contributes to the advancement of cleaner chromium compound production by facilitating the high-value conversion of the adsorbent.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 10
·1413
·
IF 4.9
Huimin Gao,Wei Mao,Pize Xiao,Chutong Ling,Zhiming Wu,Jinghong Zhou
5-Hydroxymethylfurfural (HMF) is a versatile carbohydrate-derived platform chemical that has been used for the synthesis of a number of commercially valuable compounds. In this study, several chromium (Cr)-doped, biomass-derived hydrochar catalysts were synthesized via the one-pot method using starch, eucalyptus wood, and bagasse as carbon sources. Then, the performance of these synthesized materials for the catalytic conversion of glucose into HMF was evaluated by, primarily, the yield of HMF. The synergistic interactions between the Cr salt and the different biomass components were investigated, along with their effects on the catalytic efficiency. The differences in the catalytic activity of the synthesized materials were analyzed through structural characterization, as well as assessments of the acid density and strength. Among the catalysts, Cr5BHC180derived from bagasse presented the highest activity, achieving an HMF yield of 64.5% in an aqueous solvent system of dimethyl sulfoxide (DMSO) and saturated sodium chloride (NaCl) at 170 °C after 5 h. After four cycles, the HMF yield of Cr5BHC180decreased to 38.7%. Characterization techniques such as N2adsorption–desorption and Py-FTIR suggested that such a decline in the HMF yield is due to pore blockage and acid site coverage by humic by-products, as demonstrated by the fact that regeneration by calcination at 300 °C restored the HMF yield to 50.5%.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guihong Han,Zhixiao Wang,Bingbing Liu,Yanfang Huang,Shengpeng Su
Existing refractory-life-extending technologies had concentrated on the preparation of homogeneous high-performance refractory materials in advance. In this paper, an in situ anti-erosion approach of conventional corundum-mullite refractory material was proposed for the incineration of hazardous spent high-salt organic liquor, in which the powdery additives were directly added into the spent liquor. The phase transformation, interfacial morphology evolution, and pore distribution of the corundum-mullite refractory with and without Cr 2 O 3 /ZrO 2 addition were compared, and the in situ anti-erosion mechanism was determined via the XRD , SEM, XPS , mercury intrusion porosimetry , and thermodynamic analyses. In conventional corrosion, molten Na 2 SO 4 , the primary phase of incinerating slag, directly entered the interior of the corundum-mullite refractory through pores on the interface. The Na 2 SO 4 strongly reacted with alumina and silica at 1000–1300 °C to produce liquid albite and nepheline. Upon the addition of Cr 2 O 3 into the spent liquor, the Cr 2 O 3 powder was suspended in the spent liquor and deposited at the refractory interface to form a protective (Al,Cr) 2 O 3 solid solution layer with Al 2 O 3 . The dense corrosion-resistant layer of (Al,Cr) 2 O 3 with a depth of 0–3 mm on the surface of the firebricks seldom reacted with molten Na 2 SO 4 . This protective layer can effectively slow down the penetration and erosion of incinerating slag. The environmental risks of Cr(VI) contamination associated with the Cr 2 O 3 addition in the incineration process were also evaluated in this work. Eventually, preliminary trial operation results showed that the service life of the corundum-mullite firebrick was prolonged after 5% Cr 2 O 3 addition into the spent liquor.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
National Science Review
·
2019
·Vol. 7
·期 3
·652-659
·
IF 13.222
Chen Xianjie,Xu Yuan,Ma Xinguo,Zhu Yongfa
Herein, a wide-spectrum (∼678 nm) responsive Bi8(CrO4)O11 photocatalyst with a theoretical solar spectrum efficiency of 42.0% was successfully constructed. Bi8(CrO4)O11 showed highly efficient and stable photocatalytic water oxidation activity with a notable apparent quantum efficiency of 2.87% (420 nm), superior to many reported wide-spectrum driven photocatalysts. Most remarkably, its strong oxidation ability also enables the simultaneous degradation and complete mineralization for phenol, and its excellent performance is about 23.0 and 2.9 times higher than CdS and P25-TiO2, respectively. Its high activity is ascribed to the giant internal electric field induced by its large crystal dipole, which accelerates the rapid separation of photogenerated electron–hole pairs. Briefly, the discovery of wide-spectrum bismuth chromate and the mechanism of exponentially enhanced photocatalytic performance by increasing the crystal dipole throw light on improving solar energy conversion.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 11
·4880-4886
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IF 2.956
Dan Liu,Peng Shi,Wei Ren,Yantao Liu,Ming Liu,Gang Niu,Qijing Lin,Bian Tian,Zhuangde Jiang,Zuo-Guang Ye
Film thermocouples as the most effective tool are used to monitor the real-time and accurate in situ temperature in harsh environment, which will demand their electrodes with high thermal-resistant properties, high sensitivity, and stability. In this work, a series of solid solutions based on strontium lanthanum chromate were systematically investigated as new electrodes. LaCrO 3 and La 0.8 Sr 0.2 CrO 3 with some glass additives were chosen to fabricate high-performance thick-film thermocouple due to a bigger Fermi level difference between them. The thermocouple shows a high sensitivity (107.8 μV/°C) during static calibration, and an excellent reproducibility and stability during multicycle calibrations carried out up to 1550°C, resulting in a record ultra-high temperature sensing in film thermocouples. This facile thermocouple may open up a new way to measure high temperature in air or oxidation atmosphere accurately.
研究领域:
材料科学
·
传感器技术
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2023
·
IF 10.9
Chengbo Zhang,Xiaoping Tao,Wenchao Jiang,Junxue Guo,Pengfei Zhang,Can Li,Rengui Li
The conversion of renewable solar energy into chemical energy is an important topic in research. Recently, bismuth chromate (Bi 2 CrO 6 ) has attracted attention in photocatalytic research, particularly for its potential applications in pollutant degradation and water splitting. This layered metal oxide exhibits a narrow optical band gap of approximately 1.9 eV and can utilize most of visible light in the solar spectrum. However, the photocatalytic activity of Bi 2 CrO 6 is relatively low, and its poor charge separation properties restrict its practical applications. Herein, we report a microwave-assisted hydrothermal method for the fabrication of Bi 2 CrO 6 crystals with high crystallinity and uniform morphology. Compared with the conventional preparations, microwave irradiation induces rapid volumetric heating and greatly accelerates nucleation and growth reactions, forming Bi 2 CrO 6 crystals within minutes. Multiple characterization methods, including X-ray diffraction, Raman scattering, and scanning electron microscopy, were employed to examine the crystallinity and morphologies of the samples. Microwave-assisted synthesized Bi 2 CrO 6 crystals showed better water oxidation activity in photocatalytic and photoelectrochemical tests than the conventional samples. Oxygen evolution rates were boosted 7.2 and 3.1 times using AgNO 3 and Fe(NO 3 ) 3 as electron acceptors, respectively. Further investigations showed that microwave-assisted Bi 2 CrO 6 crystals exhibited improved photogenerated charge separation. The average lifetime of photogenerated carriers, calculated from time-resolved photoluminescence results, also showed an increase. Furthermore, using photodeposition of metals and oxides as probes, the spatial separation of photogenerated electrons and holes was demonstrated to take place between {001} top and side facets of the Bi 2 CrO 6 crystal samples. Loading reduction and oxidation cocatalysts onto different facets significantly enhanced the photocatalytic activities. These results enforce the promise of microwave-assisted Bi 2 CrO 6 crystal synthesis for photocatalytic water-splitting applications and present a solution for efficient solar-energy conversion. Download: Download high-res image (64KB) Download: Download full-size image
研究领域:
材料科学
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化学
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能源科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 16
·15492-15506
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IF 2.8
Li Junfei,Xie Yingying,Lu Guining,Ye Han,Yi Xiaoyun,Reinfelder John R.,Lin Zhang,Dang Zhi
Schwertmannite, a Fe(III)-oxyhydroxysulfate mineral formed in acidic (pH 3~4), iron- and sulfate-rich acid mine drainage (AMD) environments, tends to undergo phase transformations with changes in pH and redox condition, which may depend on the presence of various trace anions and cations. In the present study, the effects of Cu(II) on the stability of arsenate-, chromate-, and molybdate-substituted schwertmannite were investigated. The release of Fe(III) and sulfate from schwertmannite seems to be accelerated in the presence of Cu(II) at pH ~ 3, while Cu(II) retarded the dissolution of schwertmannite at pH ~ 5. XRD and SEM results showed that pure schwertmannite and chromate-substituted schwertmannite underwent transformation to goethite over a 2-month period, the presence of Cu(II) enhanced the stability of the mineral’s structure at both pH 3 and 5. However, the structures of arsenate- and molybdate-substituted schwertmannites showed no significant changes in the presence or absence of Cu(II) at both pH 3 and 5. During the phase transformation process, the amount of released oxyanions followed the sequence of chromate > molybdate > arsenate. Moreover, the release of arsenate and chromate from schwertmannite was retarded in the presence of Cu(II) at pH 5, whereas the release of molybdate was promoted. These results have important environmental implications for the stability of schwertmannite and its potential to immobilize contaminant trace elements under AMD conditions.
研究领域:
环境科学
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矿物学
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PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 136
·期 3
·
IF 2.7
Wang L. G.,Cui H.,Zhu C. M.,Wang R.,Yu G. B.,Su X. F.,Jiang X. L.,Jiang Y.
Some spinel chromium oxides with the chemical formula ACr 2 O 4 exhibit magnetic-induced multiferroicity due to the special spiral spin order. However, because of the relatively low temperature of the ordered spiral phase, this kind of multiferroicity generally displays a limited coexistence of magnetic and ferroelectric orders in a narrow temperature range. The Jahn–Teller (JT) effect, serving as a crucial link between charge and orbit degrees of freedom, can facilitate efficient modulation of multiferroic properties. In this work, Ni 1− x Cu x Cr 2 O 4 (0 ≤ x ≤ 0.2) series are synthesized by occupying the same Wyckoff site with two kinds of JT ions. The microstructure and JT distortion can be distinctly influenced by varying the doping level of Cu 2+ ions. Particularly, Ni 0.85 Cu 0.15 Cr 2 O 4 ( x = 0.15) presents the pronounced JT distortion, accompanied by observation of dielectric anomaly at ∼78 K, resulting from spin–orbit coupling. This implies that the JT effect can significantly promote the contribution of spin–orbit coupling in magnetoelectric correlation. Moreover, the magnetodielectric effect induced by intrinsic magnetoelectric coupling is confirmed in Ni 0.85 Cu 0.15 Cr 2 O 4 over a wide temperature range of 10–200 K, which is much higher than the Néel temperature of ∼85 K. It indicates that spin–orbit coupling based on the JT effect could overcome the constraint of magnetic order to achieve effective control on electric polarization performance under an applied magnetic field, thereby showing broad application prospects.
研究领域:
材料科学
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凝聚态物理
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DOI
高影响因子
Minerals
·
2018
·Vol. 8
·期 4
·145
·
IF 1.835
Cheng Wang,Shaozheng Leng,Yuan Xu,Qinyue Tian,Xuemeng Zhang,Liyun Cao,Jianfeng Huang
Amino functionalized hydrophobic zeolite was prepared by modification of natural zeolite with 3-aminopropyltrimethoxysilane. X-ray diffraction, Fourier transform infrared analysis, thermal gravimetric analysis, Brunauer-Emmett-Teller surface areas, and element analysis were employed to investigate the structures of the samples. The water vapor adsorption method was used to determine the hydrophobicity of the samples. The adsorption properties of the samples for chromate and naphthalene were then investigated. The results showed that the silane modification had a negligible effect on the crystalline structure of zeolite while significantly decreasing the specific surface area and increasing the hydrophobicity of the zeolite sample. The functionalized zeolite samples exhibit higher adsorption capacity and removal rate on chromate and naphthalene as compared with the unmodified zeolite sample due to their specific amino functional group and hydrophobicity property.
研究领域:
环境科学
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材料科学
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化学工程
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污染控制
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吸附分离
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Bo Peng,Yue Lu,Jun Luo,Ziling Zhang,Xu Zhu,Lin Tang,Lingling Wang,Yaocheng Deng,Xilian Ouyang,Jisui Tan,Jiajia Wang
A visible light self-powered photoelectrochemical (PEC) aptasensor based on silver chromate particles, graphitic carbon nitride nanosheets and graphene oxide sheets (Ag 2 CrO 4 /g-C 3 N 4 /GO) for the ultrasensitive detection of chloramphenicol (CAP) was reported in this work. g-C 3 N 4 was considered to be the fundamental photoelectric material because of its great oxidation ability of photogenerated hole as well as excellent biocompatibility and low toxicity. However, the narrow light absorption range and rapid carrier recombination rate limit the application of pure g-C 3 N 4 . Herein, Ag 2 CrO 4 and GO as photosensitizer were introduced to improve the photoelectric properties of g-C 3 N 4 . The photocurrent of the developed ternary composite was about 3 times higher than that of pristine g-C 3 N 4 , which proves it can be used as a suitable photoelectric active material. Moreover, the mechanism of Z-scheme electron transfer path was proved by density functional theory (DFT) calculation. The fabricated PEC aptasensor exhibited high sensitivity toward CAP with a wide liner response of 0.5 pM to 50 nM and a detection limit of 0.29 pM. The specific recognition mechanism and excellent sensing performance indicated this aptasensor could serve as a useful tool for selective and ultrasensitive CAP detection in practical analysis.
研究领域:
分析化学
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材料科学
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生物传感
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Jian Gao,Yuqi Shi,Minglu Tang,Yuancai Chen
Chromate bioreduction is a promising bioremediation strategy, but its application in wastewater treatment is limited by the Cr(VI) biotoxicity, particularly due to the generation of Cr(VI)-induced reactive oxygen species (ROS). To mitigate these adverse effect, this study synthesized bio-Pd 0 in Citrobacter freundii to modulate distinct Cr(VI) aerobic/anaerobic reduction pathways. With the incorporation of bio-Pd 0 , aerobic and anaerobic Cr(VI) specific removal rate increased by 18.1–21.2 and 51.5–87.9 times, respectively. The genomics, RT-qPCR, respiratory inhibition experiments, ROS levels and antioxidant enzyme activity assays demonstrated that bio-Pd 0 enhanced intracellular Cr(VI) aerobic bioreduction mainly via upregulating the chromate multi-electron reductase (Cr-MER) (related with YieF, NfsA and NemA), together with the energy-dependent resistance system (antioxidant enzyme superoxide dismutase and catalase, efflux pump Emr, DNA repair protein RecG). Cr-MER and resistance system effectively reduced the generation and accumulation of ROS, respectively. For anaerobic conditions, bio-Pd 0 facilitated hydrogenase-mediated short respiratory chain (S-chain) to reduce Cr(VI) extracellularly (related with HypE, RutF and OmcG), avoiding ROS generation and the energy consumption of the intracellular detoxification system, and maximized the energy utilization for Cr(VI) extracellular reduction. This study provides a new strategy for Cr(VI) bioreduction and elucidates the underlying mechanism.
研究领域:
环境生物技术
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微生物学
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生物修复
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生物化学
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基因组学
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毒理学
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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）