COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yajing Hu
Prometheus stole fire for mankind, but tungsten brought light to mankind. Wolframite is beneficiated through froth flotation and used as a raw material to produce tungsten. However, the flotation of wolframite using the surfactants as the collector at low temperature is still one of the most significant problems in industry. In this paper, a novel hydroxamic acid surfactant dodecanediohydroxamic acid (DHA) was synthesized and firstly used in wolframite ore flotation, which was compared with the conventional monomolecular collector sodium oleate (NaOL). The results of flotation test indicated that the changes of the temperature did not significantly influence DHA’s collecting power in floating wolframite. At 0 °C, wolframite concentrate with WO 3 recovery of 83.65 % and grade of 55.25 % was obtained by using 200 g/t DHA. Density functional theory (DFT) calculations suggested reactive sites of DHA were two –C(O)NHOH groups, and DHA showed superior electron-donating ability and chemical reactivity that may promote its flotation performance.
研究领域:
矿物加工工程
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理论化学
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·
IF 1.5
Yan Huijun,Huo Long,Li Mingxia,Azhati Hayinaer,Bai Jianwei
Uranium extraction from seawater is of great significance for the development of the nuclear industry. However, the adsorption of uranium is limited by selectivity of uranium and recycle performance. In this study, amidoxime-functionalized polymer (BP-AO) was prepared by coupling benzene with phenylacetonitrile to extraction uranium from aqueous solution. Adsorption experiments show that the adsorption progress of BP-AO can reach equilibrium within 5 min and the maximum adsorption capacity is 193.9 mg·g −1 calculated by Langmuir model. The selectivity of BP-AO for U(VI) is excellent and after five adsorption–desorption experiments, the adsorption capacity only decreased about 10%. The adsorption mechanism shows that the sorption is mainly due to the formation of stable chelates between the amidoxime groups and U(VI). These results demonstrate the potential application of the adsorbent for practical utilization.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Pengwu Xu,Ning Ding,Hong Wang,Jieyu Guan,Yirui Shen,Deyu Niu,Weijun Yang,Piming Ma
Thermoset polyurethanes face significant deterioration of physical properties after damage self-healing or reprocessing. It is still a great challenge to design the structure of polyurethanes to realize damage self-healing and reprocess ability under mild conditions. In this work, a series of double-crosslinked networked polyurethanes with different crosslinking densities were synthesized by designing a synergistic crosslinking strategy of oxime-carbamate bonding and hydrogen bonding arrays. By regulating the density of the crosslinked network and the content of strong and weak hydrogen bonds, the tensile strength of the polyurethanes was increased from 13.1 to 24.3 MPa, and the toughness was increased from 66.5 to 129.2 MJ/m 3 . Meanwhile, the synergistic effect of the oxime-carbamate with low activation energy and hydrogen bonding arrays enabled the polyurethanes to have an excellent self-healing (97 %) and reprocessing. The polyurethanes could be rapidly reprocessed after only 5 min of hot pressing at 120 °C by virtue of the thermal response of the dual network. More importantly, the tensile strength retention rate can still maintain more than 96 % after reprocessing. Finally, we propose the concept of a wearable device that can intelligently detect changes in resistance values during human movement. Therefore, this work provides a new idea for the preparation of polyurethanes with excellent damage self-healing and reprocessing, which is expected to expand its application.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2024
·
IF 4.7
Duan Guangyu,Zhou Chunjie,Li Xiaoya,Cao Zhanfang,Jiao Feipeng,Zhong Hong,Ma Xin,Wang Shuai
Typically, traditional rare earth element (REE) extraction processes generate industrial effluents rich in REEs, resulting in significant resource waste and environmental pollution. Hence, there are important practical applications for the preparation of adsorbents with high adsorption efficiency and superior stability for the recovery of REEs. In this work, a poly(6-(N-acetyl-acryloylamino) hexyl hydroxamic acid) (PAAHA) chelating resin was successfully prepared by grafting 6-acetyl amino hexyl hydroxamic acid onto polyacrylic resin (D113). The PAAHA chelating resin was utilized for the removal of La³⁺, Ce³⁺, and Y³⁺, and the maximum uptake capacities determined from the batch adsorption experiments were 2.10, 2.38, and 3.98 mmol/g, respectively, which were 3.09, 3.05, and 9.05 times greater than those of the D113 resin. The results demonstrated that the adsorption process was consistent with the pseudo-second-order kinetic and Langmuir isotherm models, suggesting that monolayer chemisorption was the dominant process. Concurrently, five successive adsorption‒desorption cycles revealed that the PAAHA chelating resin displayed remarkable reproducibility and stability. Notably, the –CONHOH group exhibited a marked affinity for REEs, resulting in the formation of stable five-membered rings via mechanism characterization. In summary, this resin represents a novel strategy for designing adsorbents and shows considerable promise for the remediation of mining tailings containing REEs. Graphical
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hao Peng,Xiaoyu Li,Lina Lv,Tingting Deng,He Chen,Lu Wang,Qiang He,Caiping Dang,Lianggui Bao,Yihao You,Fangting Chi
Amidoxime-based polymers have been widely regarded as ideal adsorbents for uranium extraction from seawater. However, significant challenges remain in the efficient utilization of amidoxime groups on the polymers which is closely related to the conformation of molecular chains in complex marine environments. Herein, by integrating multi-scale computational simulation with chain conformation regulation, three representative auxiliary group were designedly introduced to polyamidoxime (PAO) by grafting glycine, aminomethylsulfonic acid and aminomethylphosphonic acid. Firstly, the hydrophilicity of adsorbents was directly observed to increase significantly after modification by contact angle test and swelling test. Furthermore, the chain conformation was investigated by combined SAXS and MD simulation under real factors from seawater. Finally, uranium adsorption performance and mechanism were investigated by XPS and DFT calculation. The minimum contact angle reaches 26.9° and the maximum swelling rate is above 153.4 %. The conformation of the modified PAO was much more stretched than the raw one, with a radius of gyration up to 161.5 nm for PAO-AMP. The uranium adsorption capacity of PAO was only 165.5 mg/g, while that of the modified adsorbents PAO-AMP went up to 375.0 mg/g. The above results indicate that auxiliary groups played a role not only in optimizing the chain conformation of adsorbents but also in enhancing coordination capacity with uranium, which is beneficial for uranium extraction from seawater. This study offers a new point of view to assess adsorption phenomena of polymers, bridging chain conformations in different environment at the mesoscopic level with metal–ligand interactions at the molecular level.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ling Zhang,Mengfang Li,Xuan Liu,Jiaqi Feng,Yujia Liu,Yazhu Tu,Shuyang Li,Tao Duan
The exploration of effective gaseous iodine adsorbents is an interesting and challenging task in the field of radwaste disposal. In this study, amidoxime groups (AO) were successfully grafted onto polyacrylonitrile to obtain amidoxime grafted polyacrylonitrile (PAN-AO) for capturing gaseous iodine. The results of the combined characterization analysis have confirmed that the introduction of AO greatly improved its thermostability, porosity and available functional groups of PAN. The impacts of reaction time, iodine concentration and reaction heat on the uptake capacity for gaseous iodine were systematically studied. The PAN-AO exhibited higher iodine capture capacity (1534.4 mg/g) than PAN (72.1 mg/g) at 80 °C and 600 min, which was ascribed to the chemical reaction between electron-rich AO groups and electron-deficient iodine molecules. The studies of kinetic fitting and activation energy (E a = 44.11 kJ/mol) further confirmed that chemical adsorption was the major fashion during the whole uptake process of PAN-AO for iodine. Besides, PAN-AO still had an iodine uptake capacity of 704.4 mg/g after five recycling, manifesting the remarkable cycle performance of PAN-AO. In brief, this study offered a new reference for radioactive iodine uptake and the synthesized PAN-AO was able to serve as an efficient iodine capture material.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Liya Zhang,Can Cheng,Qina Yu,Xiaoqian Jiang,Aixin Song,Jingcheng Hao
Recovering uranium (VI) from wastewater is crucial for the sustainable development of nuclear energy industry and ecological environment health. Polyamidoxime (PAO) based 3D hydrophilic adsorbents are regarded as ideal materials for their high selectivity and adsorption capabilities. However, constructing efficient 3D hydrophilic adsorbents from inorganic and PAO composites remains a challenge. This study exploited high internal phase emulsions (HIPEs) as template to fabricate hydroxyapatite (HAP)-PAO hydrophilic xerogels for U(VI) extraction. The oil-in-water HIPEs were constructed using sodium dodecyl sulfonate (SDS) modified HAP particles as stabilizers and acrylamide (AAm) with dissolved PAO as continuous phase. After the polymerization of AAm, macroporous xerogels were prepared by removing the water and oil phases. Xerogels exhibited the removal efficiency of 99.9 % for U(VI) within 3 h with a maximum adsorption capacity of 223 mg∙g −1 . The outstanding removal performance was ascribed to the specific structure of HAP and PAO which can effectively integrate with U(VI) ions in the presence of a hydrophilic network. This work provided a new approach to fabricate the complex adsorbents of inorganic particles with PAO for the rapid clean-up of U(VI) in wastewater.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2021
·
IF 6.158
Xiao-Qiao Zhao,Wen-Qian Wu,Hua-bo Li,Zi-Chao Guo,Wang-Hua Chen,Li-Ping Chen
As a self-reactive substance, benzaldehyde oxime (BO) is prone to a highly exothermic runaway reaction and thermal hazard analysis and the reaction kinetics calculation of BO have great significance. In this work, the decomposition products of BO in nitrogen atmosphere were identified by GC–MS and HPLC techniques. The impact of the decomposition products on the decomposition behaviors of BO were analyzed by comparison of the ARC test results of pure BO and mixture of BO and decomposition products. It was found that N-benzylidene benzylamine was the intermediate decomposition product and benzoic acid , benzamide, N-benzyl benzamide, and 2,4,5-triphenylimidazole were the final products of BO. A two-step continuous autocatalytic reaction model was established to depict the decomposition process of BO. The kinetic parameters of the model were calculated by applying the nonlinear optimization method. Finally, thermal behaviors under different process temperature were predicted based on the kinetic model , and the time to maximum rate (TMR ad ) was predicted as 112.04 °C under 24 h, and 122.19 °C of 8 h, which offer crucial safety information to optimize the safety conditions of BO during usage, storage and transportation, which minimizes the industrial disasters.
研究领域:
化学工程
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安全科学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 41
·期 11
·1725-1732
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IF 4.3
Wang Yuepeng,Yang Lei,Zhang Luzhi,Huang Hongfei,Qian Bo,Gu Shijia,You Zhengwei
Polyurethane is widely used for its versatility in design and range of performance. Self-healing and recyclable dynamic polyurethane networks have attracted extensive attention due to their potential to extend service life and ensure safety in use, as well as to promote sustainable use of resources. Developing green and environment-friendly methods to obtain this material is an interesting and challenging task, as the majority of current dynamic polyurethane networks utilize the solution polymerization method. The use of solvents makes the processes complicated, harmful to environment, and increase the cost. Poly(oxime-urethanes) (POUs) are emerging dynamic polyurethanes and show great potential in diverse fields, such as biomaterials, hot melt adhesives, and flexible electronics. In this study, we utilized the solubility properties of dimethylglyoxime in raw material poly(ethylene glycol) to prepare POUs through bulk polymerization for the first time. This method is simple, convenient and cost-efficient. Simultaneously, copper ion coordination improves POUs strength and dynamic properties, with mechanical strength up from 0.54 MPa to 1.03 MPa and self-healing recovery rate up from 85.5% to 91.8%, and activation energy down from 119.6 kJ/mol to 95.4 kJ/mol. To demonstrate the application of this technology, self-healing and stretchable circuits are constructed from this dynamic polyurethane network.
研究领域:
材料科学
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绿色化学
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DOI
高影响因子
ANALYST
·
2021
·Vol. 146
·期 6
·1986-1995
·
IF 4.616
Yu Luo,Ziying Jin,Jine Wang,Pi Ding,Renjun Pei
Aptamers, which are called chemical antibodies for their high affinity and specificity to targets, have great potential as analytical tools to detect pesticides. In this work, a DNA aptamer for thiamethoxam was isolated by an improved SELEX (systematic evolution of ligands by exponential enrichment) strategy, in which the ssDNA library was fixed on streptavidin-agarose beads through a short biotin labeled complementary strand. After 13 rounds of selection, the random ssDNA pool was successfully enriched. Three sequences were chosen as aptamer candidates through sequencing and analysis and were transformed into fluorescent probes to evaluate their interactions with thiamethoxam. A fluorescent turn-on aptasensor for thiamethoxam based on the best aptamer (FAM-Thi13) and a short quenching strand were further designed and showed a quantitative linear range from 10 to 1000 nM with a detection limit of 1.23 nM for thiamethoxam. Molecular docking and molecular dynamics were used to investigate the binding site of the main probe of the aptasensor (FAM-Thi13) and thiamethoxam. Satisfactory results were also obtained in quantifying thiamethoxam in environmental water samples by the developed fluorescent aptasensor.
研究领域:
分析化学
·
环境科学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yun Xue,Meng Cao,Jianzhang Gao,Yunyang Gui,Jiaqi Chen,Peng Liu,Fuqiu Ma,Yongde Yan,Min Qiu
Electrode materials have an important influence on the performance of electroadsorption. In this paper, Polyacrylonitrile was introduced to the graphite surface by coating method, then amidoxime reaction was carried out by one-step hydrothermal method. The results of material analysis showed that the nitrile group were transformed to amidoxime group and the electrode had good thermal stability. The electrochemical test results demonstrated that the amidoxime-modified graphite felt electrode displayed a good specific capacitance of 46.5 F·g −1 in 1 M NaCl solution at a scan rate of 5 mV·s −1 . The results of batch adsorption experiments showed that the adsorption capacity of uranium could reach 164.75 mg·g −1 at −0.9 V (vs SCE). When sodium carbonate was used as eluent, the elution efficiency was 95% under the influence of reverse voltage (0.9 V). The adsorption capacity could reach 90% of the initial value after 5 times of reuse. The results indicated that the amidoxime-modified graphite felt had a good application prospect for removing uranium from water by electroadsorption method.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
Chemical Biology & Drug Design
·
2021
·Vol. 99
·期 2
·362-372
·
IF 2.817
Jia-Zhu Chigan,Jia-Qi Li,Huan-Huan Ding,Yin-Sui Xu,Lu Liu,Cheng Chen,Ke-Wu Yang
Bacterial resistance caused by metallo-β-lactamases (MβLs) has become an emerging public health threat, and the development of MβLs inhibitor is an effective way to overcome the resistance. In this study, thirteen novel O -aryloxycarbonyl hydroxamates were constructed and assayed against MβLs. The obtained molecules specifically inhibited imipenemase-1 (IMP-1) and New Delhi metallo-β-lactamase-1, exhibiting an IC 50 value in the range of 0.10–18.42 and 0.23–22.33 μM, respectively. The hydroxamate 5 was found to be the most potent inhibitor, with an IC 50 of 0.1 and 0.23 μM using meropenem and cefazolin as substrates. ICP-MS analysis showed that 5 did not coordinate to the Zn(II) ions at the active site of IMP-1, while the rapid dilution, thermal shift and MALDI-TOF assays revealed that the hydroxamate formed a covalent bond with the enzyme. Cytotoxicity assays indicated that the hydroxamates have low toxicity in MCF-7 cells. This work provided a potent scaffold for the development of MβLs inhibitors.
研究领域:
微生物学
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药物化学
·
感染病学
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产品关联
DOI
PubMed
高影响因子
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