CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yandi Li,Bo Wang,Shuangjiang Li,Zhiyong Xu,Wenbo Zhao
A series of MCl 2 @MIL-101(Cr) composites were fabricated via vacuum wet impregnation. • CaCl 2 @MIL-101(Cr)-0.35 exhibits ultrahigh NH 3 uptake of 28.9 mmol/g at 298 K and 100 kPa. • Composite shows excellent NH 3 /N 2 selectivity and cycling stability. • Adsorption rate is extremely fast and follows pseudo-second-order kinetic. • Synergistic effect between chemical and physical adsorption was proved. Ammonia (NH 3 ) is a vital chemical raw material and promising carbon-free energy carrier, its efficient capture is essential for both industrial production and energy development. However, achieving high capacity, high selectivity and high stability in NH 3 capture adsorbents still remains a challenge. Herein, a series of metal chloride@MIL-101(Cr) composite adsorbents (M = Ca, Co, Ni) were fabricated via a vacuum wet impregnation method. Structural characterization confirmed that metal chlorides were highly dispersed within the MIL-101(Cr) pores as an amorphous phase without damaging the MOF framework. The optimal CaCl 2 @MIL-101(Cr)-0.35 achieved an ultrahigh NH 3 adsorption capacity of 28.9 mmol/g at 298 K and 100 kPa, which is 3.6 times that of pure MIL-101(Cr). The extremely high NH 3 adsorption capacity is attributed to strong coordination bonds between Ca 2+ and NH 3 , and synergistically enhanced by N–H···Cl − and N–H···O hydrogen bonds involving the Cl − as well as the framework carboxylate oxygen atoms, respectively. It also demonstrated estimated high NH 3 /N 2 selectivity (>6000 at low pressure) and good short-term cycling stability, retaining over 95% of its initial capacity after 10 adsorption-desorption cycles. The adsorption kinetics were rapid, and the process was best described by the pseudo-second-order model, indicating a chemisorption-dominated mechanism. This “confinement loading” strategy effectively combines the physisorption advantages of MOFs host and chemisorption merits of metal chlorides guests, achieving synergistic enhancement of NH 3 adsorption performance. The prepared composite material exhibits shows potential for further evaluation in industrial ammonia separation and capture.
✓ 已验证
DOI
高影响因子
Processes
·
2026
·Vol. 14
·期 8
·1258
·
IF 3.4
Guiping Liao,Hongmei Tang,Jiayan Wu,Quanyun Ye,Yihao Li,Zhongbo Shang,Leiye Sun,Pingxiao Wu
Schwertmannite (Sch) is a widespread iron oxyhydroxysulfate mineral in acid mine drainage (AMD) systems, and its transformation strongly influences the environmental fate of chromium (Cr). However, the role of Ca(II), which is commonly introduced during alkaline neutralization of AMD, in regulating the transformation of Cr(VI)-adsorbed schwertmannite (Cr-Sch) and subsequent Cr redistribution remains insufficiently understood. In this study, transformation experiments were conducted under various pH conditions (3.0, 7.0, and 10.0) to investigate the effects of Ca(II) speciation on mineral transformation and Cr behavior. The results demonstrated that the transformation of Cr-Sch was predominantly pH-dependent. Under acidic conditions, Cr-Sch transformed into goethite via dissolution–recrystallization, resulting in transient Cr release followed by partial refixation. The presence of Ca(II) exerted only a minor influence due to weak interactions between Ca2+and positively charged mineral surfaces. Under alkaline conditions, Cr-Sch preferentially transformed into hematite through dehydroxylation and cation rearrangement, leading to the sustained release of adsorbed Cr(VI). In contrast, Ca(II) predominantly precipitated as CaCO3precipitate (calcite, aragonite, and vaterite) under alkaline conditions, which coated mineral surfaces and inhibited phase transformation and Cr release. These findings reveal that Ca(II) regulates Cr redistribution primarily through pH-dependent speciation and mineral–surface interactions, highlighting coupled geochemical processes governing iron mineral transformation and contaminant mobility in AMD environments. This study provides mechanistic insights for predicting Cr behavior and optimizing alkaline remediation strategies in mining-impacted systems.
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 9
·e71188
·
IF 4.2
Xi Lan,Guoliang Feng,Jintao Gao,Lei Guo,Yanling Zhang,Zhancheng Guo
The crystal structure of minerals plays a pivotal role in their applications. The V-Cr spinel is the main crystalline phase of high-chromium vanadium slag, and its crystal structure is crucial for the extraction of V and Cr resources. In this study, the phase equilibrium experiments were first conducted on vanadium slag with Cr 2 O 3 contents ranging from 0 to 15 wt.% at 1400°C. The results demonstrated that almost all V and Cr elements crystallized as V-Cr spinel, and the increase in Cr 2 O 3 content promoted the crystallization of V-Cr spinel. Subsequently, three types of V-Cr spinel crystals were obtained via in-situ super-gravity separation at 1400°C, and the corresponding crystal structures were determined based on structural characterization as (Fe 2+ )(Fe 3+ 0.085 ,V 3+ 0.77 ,Cr 3+ 0.145 ) 2 O 4 , (Fe 2+ )(Fe 3+ 0.01 ,V 3+ 0.625 ,Cr 3+ 0.365 ) 2 O 4 and (Fe 2+ )(Fe 3+ 0.005 ,V 3+ 0.475 , Cr 3+ 0.52 ) 2 O 4 , respectively. On this basis, it was found that Cr 3+ ion migrated into V-Cr spinel by replacing Fe 3+ and V 3+ ions, thereby enhancing the stability of the V-Cr spinel and serving as the fundamental reason for the promotion of its crystallization. This study provides additional crystal parameters for V-Cr spinel, which facilitates an understanding of the physicochemical properties of V-Cr spinel and is of great significance for the efficient extraction of V and Cr resources from high-chromium vanadium slag.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Mao Zhang,Jiaqing Niu,Bo-Mei Liu,Rongfu Zhou,Haijiao Xie,Yingchun Liu,Wei Liu,Rui Zou,Hui Zhang,Jing Wang
Bioimaging is essential in medical diagnostics and research, yet conventional optical methods are limited by photobleaching and background interference. Although near-infrared (NIR) persistent luminescent (PersL) materials avoid in situ excitation and autofluorescence, their signal decay and shorter-wavelength emission restrict long-term repetitive imaging. Here, we report an oxygen-vacancy-tailoring strategy in LaInO 3 :Nb,Cr, which exhibits broad NIR emission centered at 845 nm, efficient X-ray charging, and repeatable red-light recharging. Benefiting from its high-atomic-number host, LaInO 3 exhibits strong X-ray absorption, while Nb 5+ doping modulates oxygen vacancy (V O ), thereby boosting Cr 3+ NIR PersL by approximately 13 times. In vivo imaging reveals that LaInO 3 :Nb,Cr nanoparticles can be reactivated with a low X-ray dose (0.20 Gy) and repeatedly recharged in situ by red light, highlighting their potential for deep-tissue imaging. This work provides insights into defect-property relationships via ion doping and offers guidance for the rational design of PersL materials for practical applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Yonglin Liu,Shuran He,Hanfei Gao,Xinyi Wang,Qingjian Zhang,Wei Tian,Baorong Duan,Lin Liu
s The study investigated the removal of Cr(Ⅲ) and Cd(Ⅱ) by argillaceous limestone (AL) in a binary adsorption system. The results indicate that AL’s capacity to adsorb Cr(Ⅲ) is enhanced by the presence of Cd(Ⅱ). Conversely, the presence of Cr(Ⅲ) significantly decreases the adsorption of Cd(Ⅱ). The adsorption mechanisms involve precipitation, chelation, and ion exchange. AL’s adsorption behavior was well described by the pseudo-second-order kinetic model, suggesting that the adsorption process was dominated by chemical interactions and the monolayer adsorption pattern. The pH affects adsorption primarily by altering the protonation degree of the AL surface. In the single-component system, the maximum adsorption capacity for Cr(III) reached 30.98 mg·g⁻ 1 at pH 7.0, while that for Cd(Ⅱ) reached 38.80 mg·g⁻ 1 at pH 8.0. In the binary system, Cr(Ⅲ) achieved its highest adsorption capacity (42.56 mg·g⁻ 1 ) at pH 6.0, while Cd(Ⅱ) exhibited a maximum capacity of 19.16 mg·g⁻ 1 at pH 7.0. The presence of Na⁺ and Ca 2 ⁺ ions reduced the adsorption efficiency, with greater inhibition observed as ionic strength increased. This study clarifies the composite adsorption behavior of AL in multi-ion systems and can advance the direct application of natural minerals in environmental pollution remediation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hesong Wang,Jinlong Wang,Jing Zhao,Han Zhang,Luming Liu,Xueying Sun,Guibai Li,Heng Liang
As an emerging metal organic framework (MOF) material, MIL-101(Cr) has a large specific surface area and good hydraulic stability, making it ideal in applications before ultrafiltration (UF). However, the unclear interaction between MIL-101(Cr) and natural organic matter (NOM) was identified as the main limitation to understand membrane fouling. To reveal the working mechanisms of NOM removal using MIL-101(Cr), an integrated system of MOF and UF was constructed and operated in separation mode (SM) and coating mode (CM). Based on the results, MIL-101(Cr) had a high NOM adsorption capacity of 68.454 mg/g for HA and 174.725 mg/g for BSA at saturation. Permeate quality improvement occurred in both modes over a 37.7% UV 254 removal rate and a 15% fluorescence intensity decrease, and permeation performance of the hybrid system was simultaneously enhanced. We found that MIL-101(Cr) influenced membrane fouling behaviors and models because of the foulant transformation in SM and dispersed NOM in the MIL-101(Cr) layer in CM. Furthermore, MIL-101(Cr) played a dual role in the integrated system. It could remove NOM by adsorption, leading to membrane fouling reduction, but also caused additional filtration resistance. Notably, MIL-101(Cr) showed the overall positive effects due to its open hollow structure and good hydrophilicity. The π-π interactions and salt-bridges between MIL-101(Cr) and NOM played a dominant role in adsorption. Whilst SM was more efficient in membrane fouling mitigation due to reduced membrane fouling resistance and a normalized flux increase above 15%, CM could achieve the same permeate quality with less MIL-101(Cr) usage and reaction time. This study reveals the interaction between MIL-101(Cr) and NOM and their effects on UF, providing a scientific basis for the widespread application of MOFs.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Dongmei Jia,Yuejin Li,Huamin Cai,Yongzheng Duan,Jing Li,Chen Ling
Capture of heavy metal ions from aqueous solutions is a critical but challenging step in environmental treatment. In this work, NH2-MIL-101(Fe) nanoparticles were synthesized by simple solvothermal methods and applied to capture Cr(VI) anions from aqueous solutions. The results revealed that NH2-MIL-101(Fe) exhibited a high capture capacity (375.2 mg g–1) and an ultrafast capture rate (4 min reaching equilibrium). The competitive effects of coexisting ions such as Cl–, HCO3–, PO43–, Cd2+, Ca2+, and Cu2+ on Cr(VI) are very weak, suggesting that the adsorption selectivity significantly enhanced by loading amino groups on MIL-101(Fe). Density functional theory (DFT) calculation was performed to better understand the adsorption mechanism of Cr(VI), showing that the amino groups could increase the adsorption energy of Cr(VI) for enhancing the adsorption capacity. Based on powder X-ray diffraction, X-ray photoelectron spectroscopy, and DFT calculations, the Cr(VI) capture mechanism by NH2-MIL-101(Fe) nanoparticles was a combination of coordination between Fe and Cr(VI), electrostatic interaction between Cr2O72– and the protonated amino group, and reduction of Cr(VI) to Cr(III).
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 46
·e202202684
·
IF 2.307
Dehui Kong,Wenyu Xie,Jinxiong Wu,Xiuling Yan,Andrei Ivanets,Lijuan Zhang,Shasha Chu,Bo Yang,Bekchanov Davronbek,Xintai Su
Graphical Here, we used a two-phase solvothermal method to prepare electroplating sludge into LDHs. the conditions for the formation of LDHs were achieved by sodium oleate intercalation and the addition of divalent metal ions to prepare a material with a layered nanostructure. The adsorption of Congo red was mainly realized by surface metal complexation, formation of hydrogen bond and electrostatic attraction. It is a challenge to achieve the harmless treatment and resourceful use of various metal elements in electroplating sludge, and converting them into functional materials has become an important technological direction. Based on the existence of various metal ions in electroplating sludge, sodium oleate intercalated Zn−Cr-LDHs (Zn−Cr-layered double hydroxides) were prepared by two-phase solution heating method. The adsorption process of the prepared LDHs for Congo red (CR) in aqueous solution can be described by Langmuir isotherm model and pseudo-second-order kinetic model and the maximum adsorption capacity is 2750.43 mg/g. The results of TEM and XPS show that the adsorption mechanism is dominated by electrostatic adsorption, ion exchange process, hydrogen bonding interaction and surface complexation. Therefore, this paper provides a strategy for recovering metal elements from electroplating sludge to prepare LDHs adsorption materials with ultra-high adsorption capacity.
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 13
·135601
·
IF 3.5
Yudan Chai,Xuedong Wei,Yufen Wang,Shuangyan Qiao
In this paper, a Cr(OH)3 NSs@ZIF67 (NSs = nanosheets) electrocatalyst is prepared on foam Ni via a simple and rapid electrochemical deposition method. Excellent electrocatalytic activity of Cr(OH)3 NSs@ZIF67 is demonstrated. It can use the overpotential of 281 mV and 390 mV respectively to drive 10 mA cm−2 and 50 mA cm−2. It is observed that the Cr(OH)3 NSs@ZIF67 electrode has the highest initial current density at 1.57 V compared with the other two monomer electrodes and shows excellent stability at the end of 60 000 s. It has the largest electrochemical activity specific surface and lowest charge-transfer resistance, and M–O bonds (M = Co, Cr) and shifting of binding energy peaks at the interface lead to more active sites and more efficient electron transfer for oxygen evolution reaction. This work highlights the construction of highly efficient composite electrocatalysts composted of low-dimensional non-precious transition metal compounds and metalorganic frameworks, promoting the development of low-cost non-noble metal composites in energy chemistry.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ming Li,Xi Chen,Jinjin He,Shucheng Liu,Yi Tang,Xiaogang Wen
Hierarchical NiCo-LDH microspheres (NiCo-LDHM) were synthesized via a simple one-step hydrothermal process in the presence of 2-methylimidazole, and a freeze-drying technique was subsequently used to further adjust its microstructure. The obtained porous hierarchical microspheres are about 5 µm in average diameter, and consist of ultrathin nanosheets with an average thickness of 5 nm. The freeze-drying endows LDH microspheres with higher surface area and improved pore structure . The unique hierarchical porous structure, high specific surface area and positive surface charge together contribute NiCo-LDHM’ excellent capability for anionic dyes and heavy metal ions removal, its theoretical adsorption capacities for Congo red (CR), acid fuchsin (AF) and Cr(VI) are 2120, 1176 and 123 mg/g at room temperature respectively. The adsorption of pollutant molecules/ions onto NiCo-LDH microspheres conforms to the quasi-secondary kinetics model. Isotherm studies suggest that the CR adsorption onto adsorbent fits Langmiur model, while AF/Cr(VI) adsorption fits Freundlich model, indicating that the size and morphology of pollutant molecules influence the adsorption process . The adsorption is a spontaneous endothermic process and NiCo-LDHM demonstrates good recyclability, the removal rates of CR, AF and Cr(VI) can still reach 90.7%, 84.7% and 82% after five cycles, respectively. In addition, NiCo-LDH hierarchical microspheres also exhibit good anionic selective adsorption capacity in mixed-dye systems, displaying great potential for water restoration and dye recycling.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yongli Shi,Jie Feng,Zhaoxin Zhang,Ningning Cao,Jiahao Li,Heping Li,Linji Li,Quanxian Hua,Qun Ma,Kai Zhang
Polypyrrole-based adsorbents have emerged in removing Cr(VI) from wastewater based on their reduction, chelation, electrostatic attraction and ion exchange. However, it is still a formidable challenge to remove metal cations simultaneously due to electrostatic repulsion. In fact, metal ions originating from industrial activities such as chemical manufacturing and metal electroplating are always complex and multifarious. Here, we report a EDTA-crosslinking-chitosan/polypyrrole composite (EDTA-CS/PPy) with multiple types of adsorption sites (carboxyl, hydroxyl, amino), successfully realizing simultaneous removal of Cr(VI) anions and other metal cations. The maximum adsorption capacities of Cr(VI), Cu(II), Pb(II) and Cd(II) reach up to 401.25, 59.03, 77.81 and 68.31 mg/g, respectively. The adsorption mechanism is attributed to coupling interactions of the reduction, chelation, electrostatic attraction and ion exchange between targeted metal ions and EDTA-CS/PPy, investigated by experiments and DFT theories. Notably, the adsorption capacity of EDTA-CS/PPy keeps stability after three adsorption–desorption cycles. These findings may promote potential applications of EDTA-CS/PPy adsorbents in highly efficient treatment of coexisting toxic metal ions from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Dazhi Li,Rongfei Wang,Lingya Yi,Yunpeng Wei,Junying Li,Dantong Zhao,Wei Sun,Weihua Hu
It remains challenging to design alkaline hydrogen evolution reaction (HER) electrocatalyst able to stably operate at ampere-level current density . In this work, we successfully synthesized heterostructured Ni 3 S 2 /Cr 2 S 3 nanosheets on nickel foam (Ni 3 S 2 /Cr 2 S 3 /NF) for high current HER electrocatalysis in alkaline media . As-prepared Ni 3 S 2 /Cr 2 S 3 /NF reaches 0.5 and 1.0 A cm −2 currents at 230 and 333 mV overpotential, respectively. After 50 h test at 0.5 A cm −2 , the potential of Ni 3 S 2 /Cr 2 S 3 /NF remained almost unchanged. This impressive HER performance stems from its unique hybridization nature enabled hydrogen spillover, in which Cr 2 S 3 efficiently catalyzes the Volmer step, i.e., water dissociation to generate hydrogen, and the latter further transports to neighboring Ni 3 S 2 via spillover to facilitate the molecular hydrogen formation. This work provides a feasible strategy to synthesize efficient and durable HER catalysts for ampere-level water splitting.
✓ 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）