CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xinyu Sun,Quanqi Zhang,Sihan Li,Yiming Zhang,Meiyu Liu,Binbin He,Yi Mei,Yun Zu
Ca-FAU zeolite sorbents have been recognized as one of promising CO 2 capture materials, while it is subject to the change in the speciations and locations of Ca 2+ species as adsorption sites in the FAU zeolite due to its susceptible migration. In this paper, a facile strategy is reported by tuning calcination temperatures and Ca loadings, to maximize the utilization of Ca 2+ species in the supercages of CaNaX zeolites. Detail characterizations of TG-MS, in situ FTIR spectroscopy and XRD Rietveld refinement reveal the changeable regular in the chemical speciations, locations and number of Ca 2+ species in the CaNaX zeolites. Synthetic 0.05CaNaX-250 zeolite (calcined at 250 °C and Ca loading of 1.58 wt%) guarantees at least 21 Ca(OH) + species (depicted as hydroxylated Ca 2+ species) in the supercages per FAU cell unit, close to theoretical value. Such sorbent apparently improves the CO 2 uptakes and the separation from CO 2 /N 2 and CO 2 /CH 4 , along with fast kinetics, low heat of adsorption, measured by dynamic and gravimetric adsorption methods, respectively. In addition, it keeps a superior recyclability after 10 times regeneration. CO 2 -dosing FTIR experiments further illustrate that excellent CO 2 adsorption performance are benefited from the formation of Ca(OH) + ∙∙∙(CO 2 ) 2 adducts with an appropriate interaction. This work is of great significance to better understand the role of cations in FAU zeolites, and also provides an important reference value for the directional design of effective adsorption sites in other excellent CO 2 zeolite sorbents.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
BIOMATERIALS
·
2024
·
IF 12.8
Meiqi Chang,Lu Zhang,Tingting Zhang,Yanqiu Duan,Wei Feng,Shaoling Yang,Yu Chen,Zeyu Wang
The excessive intracellular Ca 2+ can induce oxidative stress, mitochondrial damage and cell apoptosis, which has been extensively explored for tumor therapy. However, the low Ca 2+ accumulation originated from Ca 2+ -based nanosystems substantially weakens the therapeutic effect. Herein, a functional plant polyphenol-appended enzyodynamic nanozyme system CaFe 2 O 4 @BSA-curcumin (abbreviation as CFO-CUR) has been rationally designed and engineered to achieve magnified Ca 2+ accumulation process, deleterious reactive oxygen species (ROS) production, as well as mitochondrial dysfunction through enzyodynamic-Ca 2+ overload synergistic effect. The exogenous Ca 2+ released by CaFe 2 O 4 nanozymes under the weakly acidic tumor microenvironment and Ca 2+ efflux inhibition by curcumin boost mitochondria-dominant antineoplastic efficiency. The presence of Fe components with multivalent characteristic depletes endogenous glutathione and outputs the incremental ROS due to the oxidase-, peroxidase-, glutathione peroxidase-mimicking activities. The ROS burst-triggered regulation of Ca 2+ channels and pumps strengthens the intracellular Ca 2+ accumulation. Especially, the exogenous ultrasound stimulation further amplifies mitochondrial damage. Both in vitro and in vivo experimental results affirm the ultrasound-augmented enzyodynamic-Ca 2+ overload synergetic tumor inhibition outcomes. This study highlights the role of ultrasound coupled with functional nanozyme in the homeostasis imbalance and function disorder of mitochondria for highly efficient tumor treatment.
研究领域:
生物医学工程
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Minerals
·
2022
·Vol. 12
·期 8
·996
·
IF 2.818
Yupeng Qian,Xuan Qiu,Tiewei Shen,Yangyang Huai,Bin Chen,Zhen Wang
In the flotation of semi-soluble minerals such as calcite and fluorite, Ca2+is one of the common dissolved components influencing the collector adsorption behaviors on the mineral surfaces. However, there is very limited research focusing on how the dissolved Ca2+affects the separation of fluorite and calcite. In the study, with sodium oleate (NaOL) as a collector and tannic acid (TA) as a depressant, a flotation test, zeta potential measurement, and adsorption experiment in the presence of Ca2+were conducted. Flotation tests indicated that in the presence of Ca2+, fluorite and calcite were both significantly depressed by TA, leading to difficulty in the separation of the two minerals. It was also found that the depression effect on fluorite flotation was minimized with a high concentration of NaOL. Zeta potential measurement and the adsorption experiment results are consistent with the flotation results, revealing that it is only in the low concentration of NaOL that the flotation of fluorite was depressed by TA in the presence of Ca2+. Specifically, in the low concentration of NaOL, TA adsorbed on the fluorite surface and depressed the flotation of fluorite due to the preferential interaction between NaOL and Ca2+in the solution leading to a shortage in the effective NaOL in the solution. In the high concentration of NaOL, the adsorbed TA on the fluorite surface was displaced by the excessive NaOL in the solution; hence, the flotation of fluorite was recovered. In contrast, TA always hinders the interaction of NaOL with calcite regardless of the presence and absence of Ca2+and NaOL, hence, depressing the flotation of calcite. The study presented that a high concentration of NaOL may mitigate the negative effect of Ca2+on the fluorite surface and improve the separation of fluorite from calcite.Keywords:calcium ion;fluorite;adsorption mechanism;tannic acid
研究领域:
矿物学
·
浮选化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
·
2022
·
IF 4.336
Ting Cui,Xueru Wang,Junyu Hu,Tianjin Lin,Zhisheng Hu,Huiling Guo,Gang Huang,Guoliang Hu,Caiying Zhang
Excessive molybdenum (Mo) and cadmium (Cd) are toxic environmental pollutants . Our previous research confirmed excessive Mo and Cd co-induced calcium homeostasis disorder and autophagy in duck kidneys, but how calcium ion (Ca 2+ ) regulates autophagy is unclear. The results revealed that the Mo- and/or Cd-induced cytosolic Ca 2+ concentration ([Ca 2+ ] c ) increase mainly came from intracellular calcium stores. Mo and/or Cd caused mitochondrial Ca 2+ content ([Ca 2+ ] mit ) and [Ca 2+ ] c increase with endoplasmic reticulum (ER) Ca 2+ content ([Ca 2+ ] ER ) decrease and upregulated calcium homeostasis-related factor expression levels, but 2-Aminoethoxydiphenyl borate (2-APB) reversed subcellular Ca 2+ redistribution. Increased Phospholipase C (PLC) and inositol 1,4,5-trisphosphate (IP 3 ) activities and inositol 1,4,5-trisphosphate receptor (IP 3 R) expression level were observed in Mo- and/or Cd-treated cells, which was reversed by the PLC inhibitor U-73122. 2-APB and 1,2-Bis (2-aminophenoxy) ethane-N,N,N′,N′-tetraacetic acid acetoxymethyl ester (BAPTA-AM) addition mitigated [Ca 2+ ] c and autophagy (variations in microtubule-associated protein light chain 3 (LC3), LC3B-II/LC3B-I, autophagy related 5 (ATG5), sequestosome-1(P62), programmed cell death-1 (Beclin-1) and Dynein expression levels, LC3 puncta, autophagosomes and acid vesicle organelles) under Mo and/or Cd treatment, respectively, while thapsigargin (TG) had the opposite impacts. Additionally, the calmodulin-dependent protein kinase kinase β (CaMKKβ) inhibitor STO-609 reversed the increased CaMKKβ, adenosine 5′-monophosphate-activated protein kinase (AMPK), Beclin-1, and LC3B-II/LC3B-I protein expression levels and reduced mammalian target of rapamycin (mTOR) and P62 protein expression levels in Mo- and/or Cd-exposed cells. Collectively, the results confirmed that [Ca 2+ ] c overload resulted from PLC/IP 3 /IP 3 R pathway-mediated ER Ca 2+ release, and then activated autophagy by the CaMKKβ/AMPK/mTOR pathway in Mo- and/or Cd-treated duck renal tubular epithelial cells.
研究领域:
毒理学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2024
·Vol. 39
·期 10
·e4914
·
IF 3.2
Lingjie Hou,Linlin Wang,Chenhua Deng,Pengyue Jin,Chaochao Wen,Wenjia Zhang,Wenting Liang
Ca 2+ ion as a second messenger in signaling pathway plays many vital roles in many biological phenomena. Thus, it is of significance for developing effective probes to detect Ca 2+ ion specifically. Herein, a new Schiff base fluorescent probe FPH , fluorescein monoaldehyde (2-aminomethylpyridine) hydrazone, was designed and synthesized to identify Ca 2+ in DMSO aqueous solution. The probe FPH revealed significant responses to Ca 2+ with a fluorescence enhancement at 540 nm, exhibiting an evident fluorescence change from ultraweak luminescence to bright green. Otherwise, the FPH displayed a good linear range of 0.67 × 10 −6 to 3.33 × 10 −6 mol/L with a lower detection limit at 7.02 × 10 −8 mol/L. The probe FPH were further successfully utilized to detect Ca 2+ in living cells by an increased bright green fluorescence.
研究领域:
生物化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AQUATIC TOXICOLOGY
·
2019
·
IF 3.794
Jian Han,Kechun Liu,Rongchun Wang,Yun Zhang,Bingsheng Zhou
Otolith consisting largely of calcium carbonate, fibrous and proteins, is vital for maintaining body balance and/or hearing of fish. The formation of otolith involves Ca 2+ transport and deposition. In the present study, we investigated the effects of Cd 2+ on otoliths development by using zebrafish embryos as model. The results showed that exposure to Cd 2+ inhibited the utricular and saccular otoliths growth, indicated by reduced lateral areas. Swimming speeds were reduced and a losing balance control was observed in Cd 2+ exposed larvae. The genes related to Ca 2+ transport (e.g. plasma membrane Ca 2+ -ATPase isoform 2 , pmca2 ; Ca 2+ -ATPase isoform 2 , atp2b1a ) and regulation (e.g. parathyroid hormone ligand type-1 , pth1 ; stanniocalcin isoform 1 , stc1 ) were significantly downregulated. However, the adverse effects of Cd 2+ on otoliths growth and swimming activity can be protected by supplementation of Ca 2+ in exposure medium. Body burden of Cd 2+ in larvae was reduced upon the supplement with Ca 2+ . The overall results suggest that exposure to Cd 2+ can inhibit influx of Ca 2+ , leading to less deposition of CaCO 3 for otolith growth, and finally result in impaired balance control and swimming activity in zebrafish larvae.
研究领域:
环境毒理学
·
发育生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Zhao Cao,Zeyu Cheng,Jieliang Wang,Yongdan Cao
Bastnaesite is an important rare earth mineral and is usually beneficiated by flotation . Sodium silicate is commonly used to depress calcium-bearing gangue minerals, however it can also depress bastnaesite when Ca 2+ ions exist in the pulp. In this study, the effect of Ca 2+ ions and sodium silicate individually or in combination on bastnaesite flotation was studied through micro-flotation, zeta potential , fluorescence spectroscopy and X-ray photoelectron spectroscopy (XPS) measurements. Micro-flotation results show that the combination of Ca 2+ ions and sodium silicate depresses bastnaesite more severely due to their synergistic effect. Zeta potential results show that the combination renders the surface potential of bastnaesite negatively shifted more significantly. Fluorescence spectroscopy shows that the combination decreases the surface hydrophobicity of bastnaesite more severely. XPS shows that the combination increases the adsorption of sodium silicate on bastnaesite by forming hydrophilic Ca-SiO 3 precipitate, which causes more serious depression on bastnaesite flotation.
研究领域:
矿物学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Lei Wu,Menghan Liu,Yuting Chen,Ming Li,Tingting Yin,Cong Ma,Wei Fan
UF is widely used as a wastewater treatment and recycling technology. However, membrane fouling is still an important factor affecting the wide application. In this study, APIm with positive amino group was adsorbed to the surface of the carboxylated polyacrylonitrile (PAN) membrane by electrostatic force to reduce the fouling of sodium alginate (SA) caused by Ca 2+ . The results show that 1 v/v% APIm was selected as the optimal dosage, accompanied by the highest water flux of 330.5 L·m -2 h −1 bar −1 and bovine serum albumin (BSA) rejection rate of 91.0 %. When the concentration of Ca 2+ was increased to 10 mM, the Ca 2+ catch amount increased to 48.25 mg/cm 2 . The main anti-fouling mechanism was that APIm captured a certain amount of Ca 2+ in situ, destroyed the complex structure of sodium alginate (SA) and Ca 2+ . Then the fouling layer was easy to be removed by physical cleaning. At the concentration of 10 mM Ca 2+ , the membrane flux recovery rate of 1 v/v% APIm membrane was increased to 80.1 %. This study demonstrates a fouling control strategy for in-situ removal of Ca 2+ bound SA fouling, providing a new approach for the future development of UF membrane.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Kaiwen Xie,Xiang Xu,Chengcheng Gao,Zhenjiong Wang,Linghan Meng,Xiao Feng,Xiaozhi Tang
The regulatory effects of different mannuronate/guluronate ratios in sodium alginate (SA) and calcium ion (Ca 2+ ) concentrations on the structure and properties of starch-SA interpenetrating polymer network (IPN)-enhanced extruded buckwheat noodles were investigated. The thermal stability of buckwheat noodles was improved by increasing the G block proportion, and 1% Ca 2+ concentration led to the highest thermal stability. With increasing G proportion and Ca 2+ concentration, cooking loss and elongation at break of extruded noodles gradually decreased. The cooking time initially decreased and then increased. Noodle hardness, chewiness, and breaking strength significantly increased. In vitro starch digestion showed that when the SA M/G ratio was 1:2 and the Ca 2+ concentration was 1%, the predicted glycemic index of noodles was the lowest and the resistant starch content was the highest. According to curve fitting based on the sensory evaluation results, the overall noodle acceptability was higher when hardness was between 3800 and 5200 g.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 5
·1101-1109
·
IF 1.307
Bian Xiangying,Zhang Yuping,Gong Li,Zhu Yuzhang,Jin Jian
I mproving the permeate flux but retaining the rejection of thin-film composite(TFC) polyamide nanofiltration(NF) membrane is a high requirement for desalination. In this work, a calcium ion(Ca 2+ ) coordinated polyamide(PA) NF membrane was prepared by directly adding CaCl 2 to the piperazine(PIP) aqueous solution during the interfacial polymerization process. Due to the coordination interaction between Ca 2+ and the amide bond in PA active layer, the number of hydrogen bonds in the PA active layer was reduced, causing in turn the decrease of physical cross-linking degree. As a consequence, the pore of the PA active layer was enlarged, prominently enhancing the water permeance of NF membrane. With the increase of CaCl 2 concentration, the pure water flux of TFC NF increased significantly while the rejection of Na 2 SO 4 decreased sightly. Compared with TFC NF membrane prepared without CaCl 2 , the permeate flux of the Ca 2+ coordinated polyamide NF membrane prepared under optimal conditions was increased by 3–4 folds with Na 2 SO 4 rejection of 95.26%. Meanwhile, such a Ca 2+ coordinated PA NF membrane showed a better SO 4 2− /Cl − selectivity.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiaoqi Liu,Yanjun Yue
Phosphorus (P) recovery from wastewater, which contain large amounts of P by biochar can not only purify sewage, but promotes the reuse of P resources. The traditional enhancement of biochar's adsorption capacity through metal ion modification, such as with Ca 2+ , has shown promising results but is often hindered by high preparation costs. In this innovative work, we present a novel approach to prepare Ca-laden biochar (label as Ca-PSB) using egg-shells as a sustainable and low-cost calcium source. The biochar was prepared by peanut shell through anaerobic pyrolysis for 2 h at 400 °C under N 2 atmosphere. Three kinds of Ca-PSB were prepared according to the content of modifier (CaCl 2 ). The physiochemical properties of the Ca-PSBs were more conducive to adsorption of P. The economic cost of preparing was evaluated. The pore parameters were changed after the Ca modification. Especially, specific surface area of Ca-PSBs were increased by 4.82 %−12.05 % than raw biochar. The P adsorption capacity of Ca-PSB was 111.34 %−114.34 % higher than that of raw biochar. Ca-laden biochar showed excellent P adsorption, due to the Ca and CaO x on the Ca-PSB surface reacted with PO 4 3- through hydrogen bonds or through stable inorganic precipitation. This work provides an inexpensive strategy for preparing biochar with high efficiency for phosphorus adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2020
·Vol. 30
·期 3
·463-470
·
IF 2.093
Chen Hongxia,Peng Junxiang,Yu Long,Chen Hui,Sun Mingtai,Sun Zhenli,Ni Runyan,Alamry Khalid A.,Marwani Hadi M.,Wang Suhua
Herein, we report an interesting finding about the new application of oxytetracycline (OTC), as a fluorescent probe for the detection of calcium ion (Ca 2+ ), which proved that it can offer an expeditious, highly sensitive, and selective detection method for Ca 2+ . Upon the addition of Ca 2+ , the fluorescence of OTC could be significantly enhanced with rapid response and high sensitivity, and achieved a good limit of detection as low as 125 nM in aqueous solution. The complex formed via Ca 2+ coordinating to the hydroxyl group of OTC contributes to the fluorescence enhancement, which has been proved by several characterization methods including UV-vis analysis, binding constant determination, and fluorescence titration. The method avoided complexity for EDTA measurement of Ca 2+ in running water as proposed previously. Taking advantage of good availability, stability and operability, the OTC was further successfully applied to the detection of Ca 2+ in a real environment.
Graphical Abstract
研究领域:
分析化学
·
生物化学
✓ 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）