SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wensen Liu,Hui Su,Jian Zhang,Lina Wang,Yahui Liu,Jie Liang,Zhaowu Zhu
The hydrometallurgical process for the recovery of nickel and cobalt requires a complex and expensive impurity removal process. Solvent extraction is widely used in industry for the separation, purification, and concentration of metals. However, current commercial extractants encounter some difficulties when cobalt and nickel are extracted from solutions containing a large amount of impurities such as manganese and calcium. There is an urgent need to develop new reagents for the selective extraction of Ni and Co. In this study, N-(2-ethylhexyl)-pyridine-4-carboxamide (NEHPCA) was synthesized, and the metal extraction capacity of its synergistic solvent extraction (SSX) system with dinonylnaphthalene sulfonic acid (DNNSA) and tributyl phosphate (TBP) modifier was examined. The experimental results show that the selectivity of the new SSX system has the order Cu > Ni > Co > Zn > Mn > Ca > Al ≈ Cr (III) ≈ Mg ≈ Fe (III), with excellent selectivity for nickel and cobalt. Using an organic phase composed of 0.7 M NEHPCA, 0.35 M DNNSA, and 0.2 M TBP under 1:1O/A operation, after three-stage theoretical extraction, more than 99% of nickel and cobalt can be recovered from a synthetic leaching solution of nickel laterite ore. Mechanistic studies showed that NEHPCA and water molecules participate in the internal coordination of metals, and DNNSA provided coordination anions to achieve charge balance, forming the Ni complex in this SSX system which existed most likely in the form of [Ni(NEHPCA) 2 (H 2 O) 4 ](DNNS) 2 in the organic phase.
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高影响因子
Energy Storage Materials
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2022
·
IF 20.831
Yunlong Deng,Jian Gao,Ming Wang,Congshan Luo,Chuanjiyue Zhou,Mengqiang Wu
Metallic Li anode has attracted much attention for the high energy density rechargeable Li batteries , owing to the low potential and ultrahigh theoretical specific capacity. However, the Li dendrite growth and high activity of Li hinder the application of lithium anode. In this work, the multiplex alloy composite skeletons have been prepared via a facile two-step preparation method to solve the drawbacks of Li anode, which can form uniformly distributed nucleation sites , homogenize Li-ion flux and reduce local ionization density to suppress the growth of lithium dendrites. Based on the analysis of cross-sectional operando microscopy images, it can be confirmed that the synthesized 3D composite alloy anodes can effectively suppress the formation and growth of lithium dendrites. Li-Mg-Ca electrode exhibits the most excellent mechanical property, thermostability, interfacial stability and electrochemical cycling stability. Specifically, Li-Mg-Ca alloy electrode exhibits the stable charge-discharge cycling performance for 1000 h (pristine Li only for 120 h) at a current density of 2 mA cm −2 for 4 mAh cm −2 . The practical 350 Wh kg −1 pouch cell works well and meets the energy requirements of electronic devices. Importantly, the research work in this article provides research ideas for the later lithium-free anode materials .
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高影响因子
Results in Chemistry
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2022
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IF 0
Weiqing Cheng,Shuihua Wu,Daifang Wang,Yongming Lou
Nitrogen-doped fluorescent carbon dots (N-CDs) were prepared via hydrothermal synthesis method using citric acid and ethylenediamine as raw materials. The synthesized N-CDs were characterized by transmission electron microscopy (TEM) and multi-spectroscopic techniques. A fluorescent sensor based on the inner filter effect (IFE) was successfully established using synthesized carbon dots to detect the content of Baicalin in Baicalin capsule and the quality of Scutellariae Radix. The Baicalin linear range of the method is 1.6–72 μg·mL −1 (r = 0.9992), the detection limit is 1.0 μg·mL −1 (3-foldσ), and the precision was 0.2%. Furthermore, the N-CDs probe was used to evaluate quality of Scutellariae Radix.
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Small
·
2022
·Vol. 18
·期 13
·2107156
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IF 15.153
Xiangyang Dong,Hao Li,Lingfei Gao,Chaoji Chen,Xiaowen Shi,Yumin Du,Hongbing Deng
Solar desalination has been recognized as an emerging strategy for solving the pressing global freshwater crisis. However, salt crystallization at the photothermal interface frequently causes evaporator failure. In addition, arbitrary discharge of concentrated brine produced during desalination results in potential ecological impacts as well as wastage of valuable minerals. In the present work, a suspended-type evaporator (STEs) constructed using Janus fibrous mats is reported. The fibrous structure wicks brine to the evaporation layer and the salt gets confined in the evaporation layer until crystallization for zero liquid discharge due to the suspended design. Enhanced evaporation is observed because STEs have an additional low-resistance vapor escape path directly from the evaporation layer to the atmosphere compared to traditional floating Janus evaporators. Moreover, owing to the drastically different wettability on both sides, the evaporator allows salt crystallization only on the hydrophilic bottom layer, thus eliminating salt accumulation at the hydrophobic photothermal interface. With this unique structural design, the proposed evaporator not only maintains a high evaporation rate of 1.94 kg m –2 h –1 , but also demonstrates zero liquid discharged salt resistance and ideal recovery of the mineral in brine.
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PubMed
高影响因子
MOLECULAR NUTRITION & FOOD RESEARCH
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2022
·Vol. 66
·期 11
·2100963
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IF 6.575
Xiaoyao Ma,Kaixin Liu,Yiman Han,Yongping Bai,Fukui Shen,Mukuo Wang,Wei Wei,Jianfeng Qin,Erwei Hao,Xiaotao Hou,Yuanyuan Hou,Gang Bai
Scope Glutamate (Glu) and γ-aminobutyric acid (GABA) are the major excitatory and inhibitory neurotransmitters that control information flow in the brain. GABA dysfunction is a general vulnerability factor for mental illness. Cinnamaldehyde (CA) is found to have sedation in a mental illness model. However, the specific targets and molecular mechanisms related to the sedative effects of CA have not been elucidated. Methods and Results Metabolomics analysis and target fishing showed CA could increase the expression of GABA in vivo, and α-enolase (ENO1) is the primary target protein of CA associated with sedation. CA mainly binds with ENO1 in the cerebellar granular layer of brain, which influences the first transformations of the input signals arriving in the cerebellar cortex. The α,β-unsaturated aldehyde group of CA blocks the hydroxy group of Ser40, which induces a loss in ENO1 activation. CA also disturbs the glycolysis pathway and influences the tricarboxylic acid cycle and oxidative phosphorylation, which activate gluconeogenesis to provide energy to the brain. This mechanism is verified in zebrafish with ENO1 or glutamic acid decarboxylase (GAD) deficiency. Conclusions CA demonstrates sedation and alleviates GABA dysfunction via covalent binding ENO1, which shows the potential to improve the therapy of mental illness.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xi Li,Shiwen Wang,Baokang Xu,Xiao Zhang,Yanhua Xu,Peng Yu,Yongjun Sun
The low surface area, low porosity, weak charge transport, and metal species loss of conventional metal-based carbon materials are the main defects limiting their environmental application. In this study, a metal–organic framework (MOF)-supported Co-doped hollow carbon nitride (ZCCN) catalyst was constructed by etching zeolitic imidazolate framework-67 (ZIF-67). Excellent visible light capture and electron transfer performance of the catalyst were revealed, and 99% tetracycline (TC) degradation and 65.9% peroxymonosulfate (PMS) decomposition were achieved within 40 min. Efficient separation and transport of photogenerated electrons are the key to PMS activation and TC degradation. Meanwhile, the preserved skeleton structure of ZIF-67 and the triazine rings of carbon nitride endowed the catalyst with enhanced stability and lessened Co leaching. Density functional theory (DFT) was applied to investigate the internal effect of PMS activation on Co sites. The reduced toxicity of the intermediates revealed the potential of the ZCCN/PMS system on eliminating environmental risks caused by TC. This study provides new insights into the design of stable MOF-derived metal-based heterogeneous catalysts.
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Journal of Water Process Engineering
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2022
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IF 7.34
Bin Qi,Tiantian Chen,Zhifeng Liu,Jinqiu Qi,Qi Wang,Wenming Zhang,Xiaochen Li
To overcome the shortcomings of separation and recovery difficulties of powdered catalysts in practical applications, a novel flexible catalyst film (2D-WO 3 /CA) was formed by combining 2D-WO 3 with cellulose acetate (CA), and successfully applied in degrading organic pollutants in water under real solar irradiation. The structure, morphology and optical properties of the new photocatalytic film were characterized by using X-ray diffraction, scanning electron microscope and UV–vis diffuse reflectance spectra technology , respectively. The results showed that the absorption edges of 2D-WO 3 /CA film shifted remarkably to the longer wavelength compared with 2D-WO 3 , indicating that 2D-WO 3 /CA film could broaden the spectral response range. Furthermore, the photocatalytic capacity of the film was explored by degrading methylene blue (MB) in aquatic solution under real sunlight in the continuous baffled photo-reactor (CBPR). The film exhibited excellent degrading properties with an average removal rate of 85% for MB, and the processing load corresponded to 478.13 mg/(m 2 ·d). The film still had high activity and flexibility after treating wastewater for seven consecutive days. Therefore, the new 2D-WO 3 /CA film is promising in actual dye wastewater treatment . Based on the above analysis, MB degradation mechanism in the photocatalytic system with 2D-WO 3 /CA film was proposed finally.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Kai-Qiang Ma,Jun Han,Chu-Ting Yang,Fan Zhang,Heng Yan,Feng-Cheng Wu,Sheng Hu,Liqun Shi
Separation of actinides is of great concern from the perspective of nuclear energy development and environmental issues, and the development of a highly efficient solid-phase extraction (SPE) process holds significant promise for actinide separation. However, the slow mass transfer kinetics in the currently available SPE separation media limited the throughput and efficiency, rendering the separation process more challenging. Hierarchically porous structures with well-organized and highly interconnected pore systems have been shown to provide efficient mass transfer and enhanced performance in nature. Herein, this paper reports the synthesis of a crack-free diglycolamic acid-functionalized silica monolith with hierarchical macro and meso porous structure for SPE. The hierarchically porous structures were retained upon mild modifications, which favored the convective mass transport and provided more binding sites, resulting in fast kinetics and high throughput. The separation ability was evaluated based on the separation and recovery of Th(IV) from a complex matrix. A superior Th(IV) separation performance ( K d > 2.6 × 10 4 mL/g) was achieved in the presence of alkaline earth metals, rare earth elements, and uranium within 1 min by batch sorption, and the maximum separation coefficients of Th(IV)/Ln(III) and Th(IV)/U(VI) exceed 1000 and 140, respectively. Particularly, the synthesized material allowed the separation of Th from monazite leachates with highly efficient recovery (> 96%) at a high flow rate (5 mL/min) by column study. Investigation of the binding mechanism revealed the formation of a stable coordination complex (Th(NO 3 )L 3 ) via Th−O bonds. The material was also employed for the extraction of Pu(IV), and satisfactory sorption was achieved. Thus, this new functionalized material has potential application prospects for an improved actinide separation process.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
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IF 8.025
Qiuxing Liu,Xin Ding,Xiaoyu Xu,Hualu Lai,Zishan Zeng,Ting Shan,Tao Zhang,Meixu Chen,Yanjuan Huang,Zeqian Huang,Xiuling Dai,Meng Xia,Shengmiao Cui
Tumor cells with innate oxidative stress are more susceptible to exogenous ROS-mediated oxidative damage than normal cells. However, the generated ROS could be scavenged by the overexpressed GSH in cancer cells, thus causing greatly restricted efficiency of ROS-mediated antitumor therapy. Herein, using cinnamaldehyde (CA) as a ROS generator while β-phenethyl isothiocyanate (PEITC) as a GSH scavenger, we designed a tumor-targeted oxidative stress nanoamplifier to elevate intracellular ROS level and synchronously suppress antioxidant systems, for thorough redox imbalance and effective tumor cells killing. First, an amphiphilic acid-sensitive cinnamaldehyde-modified hyaluronic acid conjugates (HA-CA) were synthesized, which could self-assemble into nano-assembly in aqueous media via strong hydrophobic interaction and π-π stacking. Then, aromatic PEITC was appropriately encapsulated into HA-CA nano-assembly to obtain HA-CA/PEITC nanoparticles. Through enhanced permeability retention (EPR) effect and specific CD44 receptor-mediated endocytosis, HA-CA/PEITC nanoparticles could accumulate in tumor tissues and successfully release CA and PEITC under acidic lysosomal environment. Both in vitro and in vivo results showed that the nanoparticles could efficiently boost oxidative stress of tumor cells via generating ROS and depleting GSH, and finally achieve superior antitumor efficacy. This nanoamplifier with good biosafety provides a potential strategy to augment ROS generation and suppress GSH for enhanced oxidation therapy.
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高影响因子
Small
·
2022
·Vol. 18
·期 30
·2203288
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IF 15.153
Gongrui Wang,Wentao Wang,Xiaoyue He,Jie Li,Lai Yu,Bo Peng,Rong Liu,Suyuan Zeng,Genqiang Zhang
Carbon materials, as promising anode candidates for K + storage due to their low cost, abundant sources, and high physicochemical stability, however, encounter limited specific capacity and unfavorable cycling stability that seriously hinder their practical applications. Herein, a feasible strategy to tailor and stabilize the nitrogen species in unique P/N co-doped disk-like carbon through the Sn incorporation (P/N Sn –CD) is presented, which can largely enhance the specific capacity and cycling capability for K + storage. Specifically, it delivers a high specific capacity of 439.3 mAh g -1 at 0.1 A g -1 and ultra-stable cycling capability with a capacity retention of 93.5% at 5000 mA g -1 over 5000 cycles for K + storage. The underlying mechanism for the superior K + storage performance is investigated by systematical experimental data combined with theoretical simulation results, which can be derived from the increased edge-nitrogen species, improved content and stability of P/N heteroatoms, and enhanced ionic/electronic kinetics. After coupling P/N Sn –CD anode with activated carbon cathode, the KIHCs can deliver a high energy density of 171.7 Wh kg -1 at 106.8 W kg -1 , a superior power density (14027.0 W kg -1 with 31.2 Wh kg -1 retained), and ultra-stable lifespan (89.7% retention after 30 K cycles with cycled at 2 A g -1 ).
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PubMed
高影响因子
Food Packaging and Shelf Life
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2022
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IF 8.749
Bing Yang,Shengnan Yin,Xiaofang Bian,Changlin Liu,Xinhong Liu,Yongli Yan,Chunxia Zhang,Hui Zhang,Zhaosheng Hou
The main target of the current exploration is to represent a novel type of edible biomaterial composed of monomethoxyl polyethylene glycol-modified O-carboxymethyl chitosan (MPEG-O-CMC) for fresh-keeping food packaging materials. MPEG-O-CMCs were prepared by a facile method that consists of three steps: the C 6 -hydroxyl group of chitin (CH) was first substituted by chloroacetic acid ; O-carboxymethyl chitosan (O-CMC) was subsequently obtained via a deacetylation reaction; and finally, the NH 2 groups of O-CMC were reacted with isocyanate-terminated methoxypolyethylene glycol (MPEG-NCO) to yield MPEG-O-CMC. The chemical structures of O-CMC, MPEG-NCO, and MPEG-O-CMC were scrutinized through nuclear magnetic resonance spectroscopy (NMR) and Fourier transform–infrared spectroscopy (FT-IR), and the influences of the MPEG content on the physicochemical features of the solution-cast MPEG-O-CMC films was extensively researched. The results showed that the introduction of polyethylene glycol (PEG) could ameliorate the hydrophilicity, thermal stability, flexibility, and tensile features of the film. When the grafting degree of MPEG was approximately 25% (the MPEG content in MPEG-O-CMC was 18.5 wt %), the film possessed a lower T g of −30 °C and higher tensile features (strain at break: 221%; ultimate stress: 4.4 MPa). The water vapor transmission rates (WVTR) of the MPEG-O-CMC films was evaluated by osmosis tests at different humidity, and the results showed that films possessed good WVTR of 25–200 g·mm/(m 2 ∙24 h) at 50% humidity. The WVTR decreased gradually with the increase of MPEG content in the material, which was mainly attributed to the flexible MPEG segments acting as a plasticizer and reducing the dimension of the transient interspaces. Furthermore, the preliminary evaluation of bacteriostatic activity indicated that the films possess a certain bacteriostatic activity against Escherichia coli . Due to its good tensile properties , acceptable WVTR and potential bacteriostatic activity, this nontoxic and even edible biomaterials hold significant promise for application in fresh-keeping food packing materials.
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高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Xiaoyan Qi,Huimin Wang,Xinyu Gao,Lei Zhang,Sen wang,Xia Wang,Ping Xu
Environmental pollution caused by aromatic compounds (ACs) has long stimulated the emergence of creative bioremediation strategies. Pseudomonas putida B6–2, an aerobic ACs degrading bacterium, successfully coupled ACs degradation with power generation in microbial fuel cells (MFCs) when a nickel-coated sponge with a three-dimensional macroporous structure served as the anode. The simultaneous removal of coexisting ACs pollutants including biphenyl (BP), carbazole (CA), and dibenzothiophene (DBT) were achieved in MFCs, accompanied by the efficient power densities of 469 mW m −2 , 499 mW m −2 , 541 mW m −2 , and 587 mW m −2 for single (BP), binary (BP+DBT or BP+CA), and ternary (BP+DBT+CA) ACs fueled MFCs, respectively. Degradation dynamics analysis indicated that the degradation of BP, CA, and DBT was consistent with the pseudo-first order kinetic model in the ternary ACs fueled MFC, and BP had a higher degradation rate ( k obs =0.0337 h –1 ) than DBT ( k obs =0.0201 h –1 ) and CA ( k obs =0.0149 h –1 ). It is the first time that P. putida B6–2 was discovered as an electroactive bacterium with high extracellular electron transfer (EET) capability. The EET preliminary analysis showed that P. putida B6–2 might transfer extracellular electrons by redox mediators and microbial nanowires . The mediators may play a key role in indirect EET at the start-up period of the MFCs, while the nanowires may involve in direct EET during the whole discharge process of the MFCs. The interesting findings may lay a foundation for further exploration of the EET of P. putida B6–2 and bioremediation of ACs pollutants.
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高影响因子
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