MINERALS ENGINEERING
·
2026
·
IF 6
Chuilei Kong,Lingyun Liu,Hao Cheng,Linhua Jiang,Wei Ge,Chuanzhen Wang,Zeqing Liu
Based on DFT calculations and flotation experiments, this study systematically investigated the adsorption behavior of salicylhydroxamic acid (SHA) on kaolinite in three typical configurations (SHA-Kao, SHA_[Kao-Al], and [SHA-Al]_Kao). Results showed that SHA preferentially formed stable adsorption on the kaolinite (0 0 1) surface, and the presence of Al 3+ significantly enhanced adsorption. The SHA_[Kao-Al] configuration exhibited the most favorable adsorption energy (−550.87 kJ/mol) and Mulliken charge transfer (0.85 |e|), indicating that Al 3+ activates the kaolinite surface and facilitates electron transfer, thereby lowering adsorption energy. Flotation tests confirmed that SHA_[Kao-Al] achieved markedly higher recovery under acidic conditions (pH < 6), while the hydrolysis and precipitation of Al 3+ at higher pH suppressed surface activation, reducing recovery. FTIR and XPS results further confirm that SHA predominantly adsorbs on the Al-OH surface of kaolinite, and that the presence of Al ions markedly enhances both the coordination ability and the hydrogen-bonding strength between SHA and Al-OH sites on kaolinite, whereas only weak interactions occur on quartz. These results provide solid theoretical support for Al 3+ assisted selective flotation of kaolinite with anionic collectors.
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JOURNAL OF PLANT PHYSIOLOGY
·
2023
·
IF 4.3
Lin Xiao,Wenna Ma,Jiarong Zhang,Xiaojun Pu,Zed Rengel,Zhongbang Song,Qi Chen
Flavonols are well-known antioxidants that prevent stomatal closure via interfering with ROS signaling. Phytomelatonin regulates stomatal closure, but the signaling pathways are still largely unknown. Here, we investigated the role of flavonols in phytomelatonin-mediated stomatal closure in tobacco plants. The application of melatonin induced stomatal closure through NADPH oxidase-mediated ROS production. Transgenic tobacco plants overexpressing soybean GmSNAT1 (coding for serotonin N -acetyltransferase that catalyzes the penultimate step in phytomelatonin biosynthesis) had higher phytomelatonin concentration, accumulated more ROS in guard cells and were more sensitive to melatonin-induced stomatal closure than the wild-type plants, which was associated with the higher expression of PMTR1 -homologous genes. Exogenous melatonin decreased flavonol concentrations in guard cells and the expression of flavonoid-related genes in wild-type and transgenic tobacco plants, and these inhibitory effects were more obvious in GmSNAT1 -overexpressing plants than the wild type. However, the melatonin-mediated stomatal closure and ROS production were diminished by the application of kaempferol (a type of flavonol). Additionally, transgenic tobacco plants with increased expression of NtFLS (encoding flavonol synthase) were less sensitive to melatonin-induced stomatal closure. In conclusion, phytomelatonin hampers the biosynthesis of flavonols in guard cells, which results in high concentration of ROS and induces stomatal closure in tobacco plants.
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PubMed
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EUROPEAN JOURNAL OF PLANT PATHOLOGY
·
2023
·
IF 1.8
Xiang Ligang,Yu Zhihe,Wang Hancheng,Cai Liuti,Hsiang Tom,Li Wenhong,Guo Moyan,Li Tong,Sun Meili
Tobacco, as one of the major cash crops in Guizhou province, China, is severely affected by diseases caused by Rhizoctonia solani . Azoxystrobin is a quinone outside inhibitor (QoI) fungicide extensively used to control various crop diseases in China. To evaluate the potential effect of azoxystrobin on the physiology, morphology, and sclerotial formation of Rhizoctonia solani , 104 isolates of R. solani from tobacco collected in Guizhou were evaluated for in vitro sensitivity to azoxystrobin, and scanning electron microscopy was used to observe the effects of azoxystrobin on mycelial morphology. The effects of azoxystrobin on reactive oxygen species (ROS), superoxide dismutase (SOD), catalase (CAT), and succinate dehydrogenase (SDH) in hyphae at three time points (at 5, 10 and 15 days) and on sclerotial differentiation were examined. The effective concentration that caused 50% growth inhibition (EC 50 ) ranged from 0.3 to 552 μg/mL with a geometric mean of 8.4 μg/mL, and the frequency distribution of EC 50 values was unimodal. Scanning electron microscopy revealed that azoxystrobin caused folding, collapse and crumpling of hyphae. Under azoxystrobin stress, sclerotial differentiation was inhibited, and the production of hydrogen peroxide (H 2 O 2 ) and superoxide anion (O 2− ) as well as activities of SOD, CAT and SDH in hyphae increased significantly compared to the untreated control at day 5; while at day 10 or 15, H 2 O 2 production decreased significantly, CAT activity increased significantly, and O 2− , SOD, and SDH concentrations returned to normal levels. In general, the results provide a better understanding of the physiological effects of azoxystrobin on R. solani .
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Fei Qu,Yue Wang,Dafeng Jiang,Xian-en Zhao
The Metallacrowns (MCs) composed of repeated [Metal-N-O] subunits are a type of new material, but the MCs have not been developed and utilized in analytical applications. This essay reports on a new kind of terbium(III)-based Metallacrowns (Tb-MCs) with aggregation-induced emission (AIE) feature to build a sensing platform. It is first time that Tb-MCs are able to aggregate to larger aggregates in water along with a bright green emission, so that the property makes it possible to apply in biosensing. Thereafter, the AIE of Tb-MCs can be quenched effectively by Cu 2+ . Based on the high affinity of thiol to Cu 2+ , cysteine (Cys) recovers the fluorescence of Tb-MCs in the presence of Cu 2+ . There is a good linear range varying from 0.02 to 20 μM with a low limit of detection (LOD) 9.67 nM of Cys. In the end, this novel probe is also successfully applied to the determination of Cys in human serum with satisfactory results.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yongchao Miao,Shuming Wen,Qicheng Feng,Runpeng Liao
This work reports a new method of using Fenton to oxidize and modify the ilmenite surface using salicylhydroxamic acid (SHA) as the collector. The activation mechanism of this process was studied by analyzing changes that occurred on the ilmenite surface. Micro-flotation showed that the maximum recovery of ilmenite after treatment with Fenton increased by 37% and attributed to the increase in the adsorbed SHA amount on the ilmenite surface. Zeta potential and XPS measurement data showed that Fenton promoted the conversion of Fe 2+ →Fe 3+ on the ilmenite surface that enhanced SHA adsorption. After adding Fenton, the Fe-SHA complex (formed in the pulp) interacted with the O sites of ilmenite surfaces, and improved the ilmenite floatability. The infrared spectra of the ilmenite+Fenton+SHA system showed several intense bands that indicated enhanced SHA chemisorption on the ilmenite surface. Thus, ilmenite treatment with the Fenton promoted its surface reactivity caused SHA to bind with the ilmenite surface and enhanced the ilmenite floatability.
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MINERALS ENGINEERING
·
2021
·
IF 4.765
Yang Cao,Xiong Tong,Xian Xie,Qiang Song,Wenjie Zhang,Yunpeng Du,Shengdong Zhang
Grinding plays an important role in the beneficiation process. Different grinding media can determine the size distribution, shape, and even the surface properties of the produced material. However, comprehensive research related to the effect of grinding media on the flotation performance of cassiterite is lacking. In the current study, the effects on the flotability of the products obtained by grinding with ceramic and stainless steel media were investigated using micro-flotation, laser particle size distribution analysis, inductively coupled plasma optical emission spectroscopy (ICP-OES), chemical element analysis, zeta potential measurements, field emission scanning electron microscopy-energy dispersive spectroscopy (FESEM-EDS), and X-ray photoelectron spectroscopy (XPS). The micro-flotation results demonstrate that the flotability of stainless steel ground cassiterite surpasses that of ceramic. The laser particle size distribution test reveals that the two grinding media do not have a strong impact on the particle size distribution. The ICP-OES and chemical element analysis results identify the higher iron content in the samples and pulp of stainless steel ground cassiterite as the principle influencing factor. The zeta potential analysis indicates that the dissolved iron ions absorbed on the cassiterite surface results in a positive shift of the mineral surface potential. This not only reduces electrostatic repulsion but also increases the active sites of salicylhydroxamic acid (SHA) chemisorption. FESEM-EDS results demonstrate the rougher surface and higher iron content of the stainless steel ground cassiterite compared to the ceramic ground cassiterite, thereby increasing the SHA adsorption. The stainless steel grinding cassiterite was observed to alter the chemical environment of Fe species on the cassiterite surface via XPS analysis, with Fe 2+ exhibiting a stronger reactivity and stability towards SHA compared to Fe 3+ . Thus, the stainless steel media ground cassiterite demonstrates an improved flotability performance compared to the ceramic equivalent.
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Science China-Life Sciences
·
2020
·Vol. 64
·期 5
·816-827
·
IF 4.611
Liu Ying,Zhang Hua,Cui Yan,Zheng Yanli,Chen Hui,Hu Zhangli,Wu Qingyu
The vital function of mitochondrial alternative oxidase (AOX) pathway in optimizing photosynthesis during plant de-etiolation has been well recognized. However, whether and how AOX impacts the chloroplast biogenesis in algal cells remains unclear. In the present study, the role of AOX in regulating the reassembly of chloroplast in algal cells was investigated by treating Auxenochlorella protothecoides with salicylhydroxamic acid (SHAM), the specific inhibitor to AOX, in the heterotrophy to autotrophy transition process. Several lines of evidences including delayed chlorophyll accumulation, lagged reorganization of chloroplast structure, altered PSI/PSII stoichiometry, and declined photosynthetic activities in SHAM treated cells indicated that the impairment in AOX activity dramatically hindered the development of functioning chloroplast in algal cells. Besides, the cellular ROS levels and activities of antioxidant enzymes were increased by SHAM treatment, and the perturbation on the balance of NAD + /NADH and NADP + /NADPH ratios was also observed in A. protothecoides lacking AOX activity, indicating that AOX was essential in promoting ROS scavenging and keeping the redox homeostasis for algal chloroplast development during greening. Overall, our study revealed the essentiality of mitochondrial AOX pathway in sustaining algal photosynthetic performance and provided novel insights into the physiological roles of AOX on the biogenesis of photosynthetic organelle in algae.
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Minerals
·
2020
·Vol. 10
·期 3
·282
·
IF 2.38
Wenliang Xiong,Jie Deng,Kaile Zhao,Weiqing Wang,Yanhong Wang,Dezhou Wei
The flotation of bastnaesite, as a major mineral source of rare earth elements, attracting much attention in the mineral processing field, is challenging owing to the natural flotability of calcium-bearing minerals. To promote the application of flotation, we systematically investigated the flotation behavior of bastnaesite, barite, and calcite, with salicylhydroxamic acid (SHA) as the collector through micro-flotation experiments, zeta-potential measurements, Fourier transform infrared (FT-IR) analyses, X-ray photoelectron spectroscopy (XPS) analyses, and solution chemistry analyses. Micro-flotation experiments confirm that the flotability of bastnaesite is high at pH 6.5–8.5, while calcite floats at pH 8.0–9.5, and barite has little flotation response. The results of FT-IR, XPS, and zeta-potential measurements indicate that there is chemical adsorption of SHA on the bastnaesite surface, and physical adsorption also occurs. However, as for barite and calcite, there is only physical adsorption of SHA on the surfaces. The solution chemistry results show that SHA anions can interact with RE3+, REOH2+, and RE(OH)2+on bastnaesite surfaces in aqueous suspensions, resulting in bastnaesite flotation.Keywords:bastnaesite;barite;calcite;salicylhydroxamic acid;flotation
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Journal of Chemistry
·
2020
·
IF 1.79
Liping Zhang,Xin Zhang,Jun Xiang,Jingwen Xue,Xuejing Song
Salicylhydroxamic acid is an excellent collector of oxidizing ore, and it has an efficient collection performance for tungsten molybdenum ore. However, the utilization ratio of salicylhydroxamic acid is relatively low in the flotation process, and a large amount of flotation wastewater discharged might cause damage to the water environment. This study mainly compared the effects of natural sunlight degradation, ozonation, and Fenton oxidation processes on the treatment of salicylchydroxamic acid wastewater from W–Mo mineral processing. The results showed after 30 hours degradation by natural sunlight, the CODcr removal rate of wastewater was only 25.99%. When the initial pH was 8, the dosage of O3 was 1.3 mg/L and the reaction time was 60 minutes; O3 oxidation could remove 40.37% CODcr from wastewater, and the BOD5/CODcr value increased to higher than 0.3 after 15 min reaction. Under the Fenton oxidation conditions such as initial pH 3, H2O2 dosage 0.96 g/L, and the molar ratio of H2O2 to Fe2+ 2 : 1, 90.43% CODcr could be removed from flotation wastewater after 90 min reaction, and the BOD5/CODcr value was obviously improved. Fenton oxidation was a high efficient processing technology for salicylhydroxamic acid wastewater, and the effluent could meet the discharge and reuse emission standard requirements in China.
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JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Yanxu Wang,Siyuan Yang,Qianqian Wang,Bo Chen,Shenxu Bao,Wenbo Li,Cheng Liu
The efficient flotation separation of rare earth elements (REEs) from gangue minerals is crucial in mineral processing. This study synthesized a quaternary ammonium salt ionic liquid collector, tetrabutylammonium salicylhydroxamate (T-S), and investigated its performance in separating bastnaesite and fluorite. T-S was synthesized from salicylhydroxamic acid (SHA) and tetrabutylammonium chloride (TBAC), and its molecular structure was characterized using Fourier transform infrared (FTIR) spectroscopy. Microflotation tests indicate that T-S outperforms SHA and TBAC in both collecting ability and selectivity for bastnaesite. Adsorption, zeta potential, and infrared spectroscopy measurements reveal that T-S exhibits stronger adsorption on bastnaesite compared to SHA and TBAC. X-ray photoelectron spectroscopy (XPS) and molecular dynamics simulations (MDS) results confirm that chemical adsorption occurs between Ce on the bastnaesite surface and the –C(=O)NHOH groups of T-S. Moreover, the interaction between T-S and the bastnaesite surface is stronger than that with the fluorite surface. This work provides valuable insights for designing ionic liquid collectors for the flotation separation of bastnaesite and fluorite.
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JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Mengke Bai,Wenya Lai,Fei Zhou,Hangqing Xie,Jing Xu,Jiadi Lian,Shiqing Xu
Triplet excitons serve as a critical pathway for harvesting energy released during X-ray interactions with heavy elements; however, strategies to enhance their activation efficiency remain limited. Herein, we report a novel organic doping approach to optimize the triplet radioluminescence (RL) of Tb 3+ /Ga 3+ metallacrown (Tb-1) scintillators. By introducing 1,2,4,5-benzenetetracarboxylic acid (PMA) as a ligand dopant, a new scintillation crystal, Tb-1-PMA, is synthesized. Compared to the Tb-1 crystal, Tb-1-PMA exhibits a significant reduction in metal content while maintaining structural integrity. When excited by ultraviolet light or X-rays, Tb-1-PMA crystal emit bright green light, and the photoluminescence quantum yield (PLQY) is increased from 36.8 % to 45.3 %. The RL intensity of Tb-1-PMA surpasses that of Tb-1 by 50 %, achieving a relative light yield of 17,000 photons MeV −1 , accompanied by nearly eliminated afterglow. These enhancements stem from improved energy-level alignment between organic triplet excitons and Tb 3+ in Tb-1-PMA, enabling efficient energy transfer. The RL intensity demonstrates a linear response to X-ray dose rates, with a detection limit of 0.044 μGy s −1 , approximately 123-fold lower than conventional diagnostic doses. This work provides a cost-effective and scalable strategy for designing organic-doped high-performance triplet-emitting scintillators.
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Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120757
·
IF 7.2
Yiping Wang,Tao Liu,Yimin Zhang,Nannan Xue,Pengcheng Hu
Di-(2-ethylhexyl) phosphoric acid (D2EHPA) is the predominant extractant for vanadium recovery from acidic leachates. However, its narrow pH extraction window necessitates pH adjustment prior to extraction, generating significant neutralization residues and causing vanadium loss. Therefore, enhancing the pH adaptability of D2EHPA to enable direct vanadium extraction at low pH is of significant importance. This study proposes an octanohydroxamate (OHA)-D2EHPA extraction system, which broadens the extraction pH range through intermolecular cooperative coordination, providing an innovative solution for the efficient separation of vanadium from impurity ions under low-pH conditions. Under optimized conditions (OHA:V molar ratio of 2:1, pH of 0.6, D2EHPA concentration of 20 vol%, organic-to-aqueous volumetric phase ratio(O/A) (phase ratio(O/A)) of 1:2, 20 min extraction at room temperature), a three-stage countercurrent extraction process achieved a vanadium extraction efficiency of 99.56 %. Using a mixed solution of sulfuric acid and oxalic acid as the stripping agent under optimal conditions (0.4 mol/L H 2 C 2 O 4 +2 mol/L H 2 SO 4 , phase ratio(O/A) of 5:1, 20 min stripping at 25°C), three-stage stripping reached a vanadium stripping efficiency of 99.21 %, enabling highly efficient separation of vanadium from impurities. Studies confirm that the extraction process follows a H⁺-desorbing cation-exchange mechanism, where synergistic dehydrogenation of N-OH groups in OHA and P-OH groups in D2EHPA facilitates vanadium coordination. Vanadium complexes in the organic phase exist as [C 8 H 16 NO 2 ]VO, [C 8 H 16 NO 2 ]VOA, and [C 8 H 16 NO 2 ]VOA(HA). Among these, [C 8 H 16 NO 2 ]VOA(HA) exhibits the lowest binding energy for vanadium and is preferentially formed during extraction. Consequently, the OHA-D2EHPA system achieves highly efficient vanadium extraction at low pH.
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