CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huan Li,Jie Wang,Shoutao Lv,Chuming Chen,Haocheng Luo,Qiong Wu,Qiangyuan Zhang,Hui Zheng,Liang Zheng
The controllable Curie temperature and high magnetic permeability of NiCuZn ferrites make them promising candidates for magnetic thermal medium. However, the temperature control of existing NiCuZn ferrite materials is not accurate enough to achieve the low Curie temperature required for tumor hyperthermia. In order to further achieve the desired Curie temperature and facilitate the advancement of temperature control materials for tumor hyperthermia, Cr–Mg co-doped NiCuZn ferrite was studied. The study investigated the influence of varying concentrations of Cr 3+ on the crystal structure and magnetic properties of Mg–NiCuZn ferrites. The results of structural characterization demonstrate that Cr–Mg co-doped NiCuZn ferrites exhibit high density and uniform distribution of elements. The introduction of Cr 3+ leads to a reduction in lattice parameters and a preference for octahedral B-sites. The hysteresis loop results show that the saturation magnetization first increases and then decreases with the increase of Cr 3+ concentration. Ni 0.09 Mg 0.20 Cu 0.14 Zn 0.60 Fe 1.89 Cr 0.050 O 3.94 ferrite at 0.30 wt% of Bi 2 O 3 exhibits optimal magnetic characteristics, including a saturation magnetization of ∼36.7 emu/g, low coercivity of ∼0.07 kA/m, high permeability of ∼982.43 @1 MHz, and an appropriate Curie temperature of 45.59 °C. Such permeability and Curie temperature can be used in the body cavity perfusion hyperthermia and deep thermal therapy.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Lifeng Chi,Xiutong Wang,Siyao Guo,Meipeng Ren,Hua Guo,Mingchun Wang,Youbo Nan,Jinguo Wang
Photocathodic protection has obtained enormous attention in the field of metal corrosion control as an efficient and eco-friendly technology. Developing the photoelectrode with good photoelectrochemical properties is a prerequisite for achieving satisfactory photocathodic protection performance. Here, the NH 2 -MIL-101(Cr)/TiO 2 heterostructures are prepared. Meanwhile, the organic linkers and metal ions from NH 2 -MIL-101(Cr) are used to synthesize the N- and Cr-doped TiO 2 anodes, respectively. The UV–vis DRS, photoluminescence spectra and photoelectrochemical tests conducted under visible light demonstrate the enhanced light absorption, suppressed photoinduced charge carrier recombination, and accelerated separation and transfer rates of photoinduced electron-hole pairs in the TiO 2 composites. The 304 stainless steel connected with NH 2 -MIL-101(Cr)/TiO 2 heterostructures shows the most negative potential (about −0.72 V vs. SCE) and satisfied stability in a 3.5 wt% NaCl solution. The result can be explained by the significantly enhanced optical and photoelectrochemical properties and the strong electric field intensity in the composite heterojunctions. Besides, it has been observed that the NH 2 -MIL-101(Cr)/TiO 2 heterostructures exhibit the best photocathodic protection performance than Cr and N-doped TiO 2 anodes. This research broadens the application scope of MOFs in corrosion resistance and helps to assess the effect of heterostructure construction and element doping on TiO 2 .
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Liqing Zhang,Bo Li,Yonggang Wei,Haoyuan Xu
Environmental problems caused by Cr(VI) need to be solved urgently. As a green and safe adsorbent, magnesium oxide has the characteristics of strong adsorption capacity and safety, non-toxic and harmless. In this study, high-performance Cr(VI) adsorption material (F-MgO) was prepared by combination hydrothermal modification of recycling MgO and doping of solid waste fly ash with the MgO that was a by-product of high magnesium laterite nickel ore. The adsorption properties of F MgO composites for Cr(VI) were evaluated, and the maximum adsorption capacity of Cr(VI) by F MgO reaches 172.6 mg/g at pH = 2.0. The F-MgO also showed high stability and excellent cycle adsorption performance. The adsorption mechanism was extensively studied by adsorption kinetics and DFT theoretical calculation, and electrostatic adsorption and chemical interaction between Cr(VI) and F MgO active sites were demonstrated. The prepared F MgO composites from waste resources with a simple synthetic method have great potential in the treatment of chrome-containing wastewater to achieve the purpose of treating waste with waste.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Han Xu,Qin Yang,Mingjiao Tian,Yaruo Zhao,Dong Guo,Zeyu Jiang,Yanfei Jian,Yadi Wang,Fan Dang,Chunli Ai,Jialei Wan,Reem Albilali,Chi He
Revealing the mechanism behind active oxygen species in chlorinated volatile organic compounds (CVOC) destruction is crucial but challenging. Herein, we designed a chromium-substituted titanium bimetal catalyst with strengthened element interaction, exhibiting remarkable ability to activate oxygen and destroy intermediates. Encapsulated chromium species triple the electron transfer speed (Cr → TiO 2 ), converting 90 % of vinyl chloride at 244 °C. The constructed Cr 6 + −O−Ti 3+ structure distorts TiO 2 lattice, generating defects that promote oxygen species activation. In-situ technologies and DFT calculations demonstrate that vinyl chloride adsorbed at Cr 6+ =O sites is oxidized by lattice oxygen, forming C O species, while surface oxygen activates in a cyclic process, promoting the *CH 2 CH to *CH 2 CHO and CH 2 CO. The constructed Cr-O-Ti structure breaks the rate-limiting step of *CH 2 CHO to CH 2 CO process, accelerating the formation of *CH 3 CO and further promoting the deep oxidation process (*CHO + *CO). This work presents new findings towards CVOC highly efficient purification, showcasing significant application potential.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Hammad Eman N.,Eltaweil Abdelazeem S.,Abouelenein Saeyda A.,El-Subruiti Gehan
Water contamination by heavy metals, especially chromium (VI), poses a critical environmental issue due to its carcinogenic nature and persistence in the environment. Addressing this, the current study develops an efficient adsorbent, CPBr-MIL-88A@AmGO, which utilizes the synergistic capabilities of Cetylpyridinium bromide–modified MIL-88A and amine-functionalized graphene oxide to enhance Cr(VI) removal from aqueous solutions. The obtained results indicate that CPBr-MIL-88A@AmGO achieves its highest removal efficacy at pH 2, where the interaction of CPBr and AmGO’s positively charged centers significantly contributes to the adsorption processes. According to the Langmuir isotherm model, the composite’s adsorption capacity reached a maximum of 306.75 mg/g. The adsorption kinetics adhered to a pseudo-second-order model along with the endothermic nature of the process. Although the presence of SO 4 2- ions significantly reduces adsorption capacity, other interfering ions including Na + , K + , Ca 2+ , Cl - , and NO 3 - only slightly affect it. Remarkably, the composite maintains high removal efficiency, over 82%, even after 7 recycling tests, underscoring its potential for practical applications in water treatment systems. The proposed mechanism involves the contribution of electrostatic attractions, ion exchange, complexation, and the reduction of Cr(VI) to Cr(III) in the removal process. This study not only offers a potent solution for Cr(VI) remediation but also contributes to sustainable water resource management.
✓ 已验证
产品关联
DOI
PubMed
Journal of Water Process Engineering
·
2024
·
IF 6.3
Shuang Fu,Yingbo Chen,Xintong Wu,Liu Ye,Linzhe Xu,Xinyu Zhao
Nanofiltration (NF) membranes play a crucial role in wastewater treatment based on their unique separation mechanism. However, conventional polyamide nanofiltration membranes are susceptible to degradation in extreme pH or chlorine environments, resulting in a limited range of applications. In this study, hydrophilic functional coatings were constructed on polyethersulfone (PES) support using the biopolymer materials, κ-carrageenan (κ-CGN) and sodium carboxymethyl cellulose (CMC). The coatings were cross-linked with glutaraldehyde (GA) to form a dense three-dimensional network structure insoluble in water, enabling structural stability in harsh environments. The Na 2 SO 4 retention of the κ-CGN/CMC/PES composite membranes was maintained at 92.1 and 91.4 % after 38 days of immersion in 20 wt% H 2 SO 4 and 2 M NaOH aqueous solutions, respectively. Meanwhile, κ-CGN/CMC/PES maintained a good salt retention (Na 2 SO 4 , ∼90.0 %) after chlorine treatment (72,000 ppm h). The excellent separation performance of the κ-CGN/CMC/PES composite membranes at different pH and concentration of Cr (VI) indicated its wide application for Cr(VI) removal at harsh conditions.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Cheng Yao,Yi Cai,Yali Gong,Yong Zhao,Qing Chen
Microplasma jet (MPJ), serving as excitation sources in miniaturized systems, has been widely used for contaminant detection. However, the employment of the MPJ is conditioned due to the limit generation of the radicals. Here, a novel 4-channel microplasma jet array (MPJA) is designed for 3,3,5,5-tetramethylbenzidine (TMB) rapid oxidation without oxidizing reagents and catalysts. The jet array, generated from a ceramic tube, allows direct contact with the sample. A colorimetric system containing the MPJA has been developed for the detection of hexavalent chromium. Compared to the MPJ, the employment of MPJA significantly makes the detection system effective and sensitive. Under optimal operating condition, the system exhibits a linear response for Cr (VI) detection within the range of 0.3–1.2 μmol L −1 , with a detection limit (LOD) of 0.11 μmol L −1 . The practicality of the system is validated through the analysis of real-world samples. The system can be packed into a case with 40 cm in length, 30 cm in width and 30 cm in height. The power consumption is 0.052 W. The system provides a potential method for samples determination in emergency.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·
IF 3.1
Yu Yan,Dongxiao Li,Zhimin Guo,Hao Ren,Yubiao Huang,Bei Yan,Ruihuan Zhao,Xin Yao
Developing efficient, low-price non-noble metal-based electrocatalysts for overall water splitting in alkaline medium remains a formidable challenge. In our work, Cr-doped CoP/Fe2P (Cr-CoP/Fe2P) flower-like microsphere was synthesized through a simple hydrothermal and phosphating process. The resulting Cr-CoP/Fe2P electrocatalyst shows significantly enhanced oxygen evolution reaction performance (262 mV @ 10 mA cm-2) and has a satisfactory hydrogen evolution reaction performance (114 mV @ 10 mA cm-2), coupled with favorable stability in an alkaline medium. Furthermore, when assembling Cr-CoP/Fe2P into an electrolytic cell, the two-electrode system can provide a current density of 10 mA cm-2 at a voltage of 1.61 V. At high current density, the performance of the electrolytic cell composed of Cr-CoP/Fe2P is superior to that of noble metal catalyst electrode pair. Electronic structure analysis and various characterizations confirm that Cr doping and the formation of CoP/Fe2P heterogeneous interfaces redistribute the electron densities of the active sites, enlarge the specific surface area, and enhance the aerophobicity of the catalysts, thereby improving the electrocatalytic property. This work provides a referable method for engineering highly efficient and stable non-noble polymetallic phosphides, which serve as bifunctional electrocatalyst for overall water splitting.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2024
·
IF 9.4
Yan-Kai Zhang,Yong-Zheng Zhang,Chun-Xiao Jia,Fang Wang,Xiuling Zhang,Yuhang Wu,Zhongmin Liu,Hui Hu,Da-Shuai Zhang,Longlong Geng,Jing Xu,Hongliang Huang
ABSTRACT The highly desired goal is to employ visible light for the photocatalytic reduction of toxic Cr(VI) to environmentally friendly Cr(III). Metal-organic frameworks (MOFs) are considered one of the most promising materials for the photoreduction of Cr(VI). Nevertheless, developing MOFs with high stability and activity is still challenging. Herein, we report a stable Zn-based MOF (named DZU-64 ) with an anthracene functionalized ligand, and its reduction of Cr(VI) under sunlight irradiation was investigated. DZU-64 exhibits excellent chemical stability in pH range of 2−14 aqueous solution, and remarkable thermal stability to 570°C. For the photoreduction of Cr(VI) under visible light irradiation, DZU-64 gives a record rate constant of 0.467 min −1 and a high Cr(VI) reduction rate of 6.68 mg Cr (VI) g −1 cata min −1 at pH 2. Moreover, under real solar light, DZU-64 can also efficiently reduce Cr(VI) to Cr(III) while retaining its catalytic activity throughout 5 cycles without any notable decline, further demonstrating its great application prospect. By combining the photovoltaic performance tests and electron spin resonance test, the possible photoreduction of Cr(VI) mechanism in DZU-64 was analyzed.
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Chun Hu,Yaodong Xiao,Qingrong Jiang,Mengyao Wang,Tingdan Xue,Ruidong Tao,Yunjun Mei
Microplastics (MPs) are novel pollutants that can adsorb heavy metals in water environments and migrate together as carriers and are prone to aging due to the light in water. However, few reports have been published on the synergistic behavior and effects of these different types of aged MPs on the adsorption and desorption of Cr(VI). Here, two MP types─polyamide (PA) and polylactic acid (PLA)─were aged by UV irradiation, and the adsorption and desorption behaviors of MPs on Cr(VI) were studied. The results indicated that UV light can rapidly age MPs. After the MPs were exposed to UV light, their specific surface area, negative charge, and oxygenic groups increased, resulting in enhanced hydrophilicity. The aged MPs depicted a markedly enhanced adsorption capacity for Cr(VI) compared with the results of aged-PA > pristine-PA > aged-PLA > pristine-PLA. The process followed the Langmuir and pseudo-second-order models, confirming that chemical and monolayer adsorption are the primary processes involved in the adsorption of Cr(VI) by aged MPs. Cr(VI) was more easily desorbed in the simulated gastric fluid environment. The desorption rate of aged MPs was lower than that of pristine MPs because of their stronger binding forces to Cr(VI). The binding of Cr(VI) to MPs mainly depends on synergistic mechanisms such as electrostatic attraction, reduction reactions, and chelation of oxygenic groups. This study clarifies the reciprocity mechanism between aging MPs and Cr(VI) and provides further insights and guidance for controlling the joint pollution between MPs and heavy metal pollutants in the future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Lin Yang,Zhou Yuan,Lufang He,Le Han,Bohan Li,Yan Xu
The design and intentional construction of crystalline materials containing two clusters with redox properties in one framework still remains challenging. Linking oxidative polyoxometalate (POM) clusters and a reductive cyclic trinuclear copper complex (Cu-CTC) to prepare stable catalysts is rarely reported. Herein, we successfully obtained two new polyoxometalate-based metal–organic compounds (POMOCs) [CuII3(PyCA)3(μ3-OH)(β-Mo8O26)0.5(H2O)2]·5H2O (1), [CuII3(PyCA)3(μ3-OH)]2(CuIIW12O40)[CuII(H2O)6] (2) (PyCA = 1H-pyrazole-4-carbaldehyde) by enabling precursors of Cu-CTC and POM cocrystallization in one pot via hydrothermal method. The [β-Mo8O26]4– cluster in compound 1 combined with Cu-CTC units to form a 1D structure, and the [CuW12O40]6– unit in compound 2 linked two Cu-CTC units to form a sandwich-like 0D structure. Also, Cu-CTC CuI3(PyCA)3·H2O (Cu3) was synthesized for performance comparison. A series of characterizations indicate that compound 1 is more conducive to electron transfer than compound 2. In addition, compounds 1 and 2 can act as bifunctional catalysts for the electrochemical detection and photocatalytic reduction of Cr(VI). Particularly, the photoreduction rates of Cr(VI) by compounds 1 and 2 are 96.7% and 96.3% for only 10 and 14 min under visible light, respectively, and it is better than that of Cu3 and most other reported photocatalysts. Furthermore, the active sites and mechanisms for electrochemical detection and photocatalytic reduction of Cr(VI) were discussed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Cai Zhengwei,Liang Jie,Li Zixiao,Yan Tingyu,Yang Chaoxin,Sun Shengjun,Yue Meng,Liu Xuwei,Xie Ting,Wang Yan,Li Tingshuai,Luo Yongsong,Zheng Dongdong,Liu Qian,Zhao Jingxiang,Sun Xuping,Tang Bo
Electrocatalytic H 2 production from seawater, recognized as a promising technology utilizing offshore renewables, faces challenges from chloride-induced reactions and corrosion. Here, We introduce a catalytic surface where OH – dominates over Cl – in adsorption and activation, which is crucial for O 2 production. Our NiFe-based anode, enhanced by nearby Cr sites, achieves low overpotentials and selective alkaline seawater oxidation. It outperforms the RuO 2 counterpart in terms of lifespan in scaled-up stacks, maintaining stability for over 2500 h in three-electrode tests. Ex situ / in situ analyses reveal that Cr(III) sites enrich OH – , while Cl – is repelled by Cr(VI) sites, both of which are well-dispersed and close to NiFe, enhancing charge transfer and overall electrode performance. Such multiple effects fundamentally boost the activity, selectively, and chemical stability of the NiFe-based electrode. This development marks a significant advance in creating durable, noble-metal-free electrodes for alkaline seawater electrolysis, highlighting the importance of well-distributed catalytic sites.
✓ 已验证
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）