COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jérémie Courtois,Chunyan Li,Chen Wang,Hongping Zhang,Heping Jin,Wei Feng
During the past decade, a large variety of materials dedicated to uranium seawater extraction has been developed for harvesting purposes. Yet, materials especially designed for decontamination following nuclear accidents are scarce and eco-friendly ones even rarer. In this study, hybrid microparticles made of biocompatible calcium carbonate and ε-poly(lysine) are used as efficient U sorbent in seawater. Their eco-friendly nature makes them interesting for both harvesting and on-site immobilization of radionuclides, also accounting their ability to settle in the seabed with limited impact on eco-systems. The material shows excellent U extraction capability in contaminated seawater ([U] = 10 ppm) with removal rate R of 87.7 % and extraction capacity of 513 mg per g of ε-poly(lysine) and remains efficient in natural condition ([U] = 2.8 ppb) with R = 39.8 %. In addition, the sorbent has a remarkable selectivity toward U versus V in U contaminated seawater as well as a significant affinity for Sr 2+ . DFT and XPS analyses revealed that U is adsorbed to ε-poly(lysine) via a chelation mechanism that involves amide and amine groups of lysine. Lability of the formed coordination complex allows easy recovery of captured U by contact with NaHCO 3 desorbing solution, ensuring recyclability of the material.
研究领域:
环境科学
·
材料科学
·
放射化学
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Pingli Jiang,Ruiqing Hou,Shijie Zhu,Shaokang Guan
To improve the anti-corrosion property of biodegradable magnesium alloy , a CaCO 3 coating was developed by hydrothermal treatment . The prepared coatings generally consisted of three layers: a dark inner layer, a bright middle dense calcite layer and a bright outer loosely deposited CaCO 3 layer. As the electrolyte concentration increased, the formation of the inner product layer and the deposition of loose aragonite products were considerably inhibited, whereas the middle calcite layer became more intact and compact, which conferred enhanced corrosion protection upon the coated samples. Additionally, this coating showed a possible transformation into calcium phosphate during immersion.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Petroleum
·
2021
·
IF 0
Heng Wang,Junying Hu,Zhi Yang,Zebin Yin,Qi Xiong,Xiankang Zhong
A highly efficient and environment-friendly scale inhibitor (MA-VA-VS) was synthesized via free radical solution polymerization method, where maleic anhydride (MA), vinyl acetate (VA) and vinyl sulfonate (VS) acted as monomers, while ammonium persulfate was used as initiator. The inhibition performance and the structure as well as properties was characterized using static jar measurement and dynamic test, Fourier transform infrared spectroscopy and thermogravimetric analysis. The surface morphology and composition of scale formed in the solution were examined using scanning electron microscopy and X-ray diffraction, respectively. The binding energies of inhibitor with calcite (104) face were calculated using Materials Studio 2017 (MS) at 323 K. The results show that the inhibition efficiency gradually increases with increasing inhibitor concentration. While as the Ca 2+ concentration increases, the efficiency first increases and then decreases. With the increase in temperature or pH, the efficiency generally decreases. It is confirmed that the inhibition efficiency can reach 91.4% when 150 mg/L MA-VA-VS is used in a flow condition. Both the calculated binding energy and inhibition performance evaluation results demonstrate that the scale inhibition performance of MA-VA-VS is better than a commercial scale inhibitor (HPMA). The excellent inhibition performance of this inhibitor is due to its chelation and dispersion properties.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
Frontiers in Chemistry
·
2021
·
IF 5.221
Xiao Chaoqiang,Zhu Li,Zhang Xia,Gao Rumeng,He Shuwang,Lv Zhihua,Hu Changqin
Calcium carbonate which is extracted from the Earth in combination with other mineral impurities, is largely used in preparations for pediatric supplements. Elemental impurities in drug products pose toxicological concerns without therapeutic benefits. Thus, it is very urgent to assess the safety of chronic exposure to elements that may be present in trace amounts. In the present study, we developed high throughput ICP-MS method for the quantitative determination of 62 elemental impurities in high matric calcium carbonate samples and validated according to USP 233. Calcium carbonate preparations which state clearly used for child (including neonates, infants, toddlers and children) from 9 manufactures and two types of raw materials (light calcium carbonate and ground calcium carbonate) were investigated in terms of the content and variability of 62 elemental impurities. According to the results, ground calcium carbonate was more suitable to be used in pediatric preparations concerning elemental impurities. Parts of elemental impurities in CaCO3 preparations which are derived from the raw materials and the preparation process, may cause potential risks for children. These results indicate that it is necessary to establish a modern instrumental analysis method to evaluate and control elemental impurities in CaCO3 raw materials and preparations.
研究领域:
药学
·
毒理学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Chaocheng Zeng,Huimin Hu,Chao Wang,Qing Shi,Qiwu Zhang,Mengfei Chen,Qian Wang,Tingting Zhang
Due to the stable chelating effect of organic phosphonates in wastewater, phosphonates with increasing emission are difficult to be removed effectively by traditional ferric salt flocculation , which has posed tough challenges for reducing total phosphorus pollution in recent years. In this work, calcium carbonate (CaCO 3 ) was introduced to work together with the widely investigated flocculant of ferric chloride (FeCl 3 ) to realize an efficient removal of nitrilotrismethylenephosphonic acid (NTMP) at much lower dosage of FeCl 3 . With an aid of synergy effect from together use of CaCO 3 and FeCl 3 , the remaining concentration as low as 0.16 mg−P/L, far below the sewage discharge limit (0.5 mg−P/L), was simply obtained with a significantly reduced Fe/P molar ratio at only 4, resulting from calcium source donor to form more stable Fe–Ca–P tridentate bridging complexes, high affinity towards ferric ions on CaCO 3 surface and slow-release alkaline from CaCO 3 . A comparison among sodium hydroxide (NaOH), calcium hydroxide (Ca(OH) 2 ) and CaCO 3 as additives, was carried out to highlight the advantages of using CaCO 3 and clarify the mechanism for the greatly improved performance by a set of characterizations including XRD, FTIR, Zeta potential , XPS , SEM−EDS and TG analyses. The addition of CaCO 3 in ferric flocculation resulted in further obvious advantages such as 75% shortened settling time and only one−third of sludge volume of the precipitant, beneficial to the sample handling in engineering application. The proposed new approach has been further confirmed to work efficiently on real phosphonate-containing wastewater. Discussion on the interaction between CaCO 3 and ferric salts in phosphonate solutions shed new insights into the working mechanism of using CaCO 3 for the treatment of phosphonates-containing wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Douxin Xiao,Jingli Cheng,Wenlong Liang,Lianli Sun,Jinhao Zhao
The study of release mechanisms of pesticides with respect to environmental and biological factors facilitates improvement in pesticide use efficiencies and reduction in environmental risk. In this study, prochloraz (Pro), a highly effective fungicide, was loaded into starch-doped porous calcium carbonate (CaCO 3 ), which was subsequently coated with a metal–phenolic film to prepare a pH-responsive delivery system (PC@TA/Cu). Results demonstrated that CaCO 3 had a mean diameter of 1.55 µm and its loading capacity for Pro was ~15.2%. PC@TA/Cu microparticles show good adhesion to rapeseed oil leaves and resisted washout with simulated rainwater. The cumulative release rate of PC@TA/Cu particles at pH = 3 was 1.63 times higher than that in near-neutral pH environment for 48 h. This pH-responsive release characteristic could be associated with the oxalic acid secreted by Sclerotinia sclerotiorum . The control effect against Sclerotinia disease with 100 μg/mL of Pro content of PC@TA/Cu was 56.8% after 7 d, while that of Pro EW (emulsion in water) was 45.8%. Finally, biosafety tests showed a 4-fold reduction in the acute toxicity of PC@TA/Cu to zebrafish, compared to the that of Pro technical. The carrier (CaCO 3 @TA/Cu) had no significant effect on the growth of rapeseed oil seedlings. The results showed that the prepared PC@TA/Cu has long-lasting disease control capability and significantly reduced toxicity to non-target organisms, making it valuable for potential applications.
研究领域:
农业科学
·
环境科学
·
植物保护
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2017
·
IF 5.527
Yan Ji,Yun Chen,Jinxun Le,Mengqi Qian,Ying Huan,Wenzhong Yang,Xiaoshuang Yin,Ying Liu,Xurong Wang,Yizhong Chen
Amino trimethylenephosphonic acid (ATMP), nitrilotriacetic acid (NTA) and ethylenedinitrilotetraacetic acid (EDTA) represent the typical phosphonate and carboxylic acid scale inhibitors , respectively. In this study, the performance of the three molecules in inhibiting the formation of calcium carbonate deposition was tested by static tests. We firstly explained the mechanism of these inhibitors on the deposition of CaCO 3 using morphology analysis, crystal testing, molecular dynamics simulation and quantum calculation. We got the conclusion that ATMP showed the outstanding performance of inhibiting the deposition of calcium carbonate, due to its excellent chelate ability with Ca 2 + , the capability of preventing the layer stacking in forming calcite and the unparalleled role of inducing the lattice distortion of CaCO 3 from calcite to vaterite at very low concentration.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yujun Cheng,Haoran Dong,Tianwei Hao
In this study, calcium carbonate (CaCO 3 ) coated nanoscale zero-valent iron (referred to as C-nZVI) was successfully synthesized and used for the removal of Cr(VI) in aqueous solution. The obtained C-nZVI particles were observed to be chain-like structure of spherical particles with a smooth surface by Transmission Electron Microscope (TEM). The magnetic hysteresis loop manifested that C-nZVI (CaCO 3 /Fe = 1:4, mass ratio) was ferromagnetic and the saturation magnetization (Ms) was 115.48 emu/g, revealing that C-nZVI had favorable properties of separation, recovery and reuse. Regarding the Cr(VI) removal, no positive correlation between the removal efficiencies and CaCO 3 /Fe mass ratio increasing from CaCO 3 /Fe = 0.5:4 to 4:4. Meanwhile, complete removal of Cr(VI) was observed at initial pH = 3.0 and initial Cr(VI) concentration of 5 mg/L, and the removal efficiency gradually decreased with increasing the initial pH and initial Cr(VI) concentration. The water chemistry had a more or less influence on the reactivity of C-nZVI. Specifically, the presence of Ca 2+ and Mg 2+ facilitated the Cr(VI) removal by C-nZVI, but the PO 4 3− and humic acid (HA) impeded the reactivity of C-nZVI. NO 3 − is generally considered to have an adverse influence on nZVI, but it displayed a positive effect on C-nZVI, which should be ascribed to the promotion of C-nZVI corrosion. Additionally, C-nZVI aged for 2 d and 30 d in air had a similar removal efficiency (83.2% and 82.6%) of Cr(VI) as fresh C-nZVI (85%), whereas the Cr(VI) removal efficiency by C-nZVI aged for the same aging times in aqueous solution were approximate 65.9% and 46.6%, respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
·
2017
·Vol. 22
·期 1
·76-82
·
IF 1.16
Gu Jia-Li,Tong Hong-Fei,Sun Lai-Yu
Macroporous magnetic agarose particles (MMAPs) were prepared with calcium carbonate as the porogent by the water-in-oil suspension thermal regeneration method. MMAPs with good sphericity and appropriate particle size were obtained. The physical properties of the beads were determined and it was found that the water content (92.1%), porosity (94.4%) and mean pore diameter (120.1 nm) of the MMAPs were higher than those for the normal magnetic particles, indicating successful generation of macropores after calcium carbonate addition. Compared with normal magnetic particles, the mass transfer of biomolecules in MMAPs was remarkably enhanced. Finally, MMAPs were modified with 5-amino-benzimidazol (ABI) ligand and the adsorption capacity of IgG reached 153 mg/mL, higher than that of the normal magnetic particles (126 mg/mL). Moreover, adsorption behavior of MMAPs to IgG was little changed after twenty-five recycled use. Hence, MMAPs prepared herein showed great potential for bioseparation.
研究领域:
生物化学
·
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Ruixing Wang,Siyuan Bian,Bao Zhang,Lengfeng Yan,Linjun Feng,Jing Bai
Microbial-induced carbonate precipitation (MICP) has garnered increasing attention in the realm of building materials. Among them, urease microorganisms have been extensively investigated due to their favorable attributes, including facile reaction control, heightened mineralization efficiency, and straightforward microorganism cultivation. Nevertheless, the presence of ammonia byproducts throughout the reaction process significantly restricted its extensive utilization. This work employed the application of microbial-induced carbonate precipitation (MICP) technology to modify the surface of cement-based materials in a solution environment. Simultaneously, the generation of struvite (MgNH 4 PO 4 •6H 2 O) was induced to eliminate ammonia byproducts and improve the cementitious ability of the film layer. The potential synergistic impact between calcium carbonate (CaCO 3 ) and struvite was observed, resulting in the production of a composite film with enhanced performance. Furthermore, the elimination efficacy of ammonia byproducts was found to exceed 90% after a treatment duration of 96 h.
研究领域:
土木工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 6
·1-10
·
IF 1.455
Mou Yongren,Kang Ming,Liu Min,Wang Feng,Chen Kexu,Sun Rong
In order to investigate the effect of amphiphilic additional agents on the morphology (particle shape, particle size and particle size distribution) and photoluminescence performance of calcium carbonate phosphor, the phosphors AA-CaCO 3 :Eu 3+ (AA = glycerol or sodium dodecyl sulfate) were synthesized by the microwave-assisted co-precipitation method using glycerol (Gly) and sodium dodecyl sulfate (SDS) as amphiphilic additional agents (AA), respectively. The phase structure, morphology and luminescent properties of the as-synthesized samples were characterized by X-ray diffraction, scanning electron microscope, laser diffraction particle size analyzer and Fluorescence spectrophotometer, respectively. The results showed that the phase structure and morphology of AA-CaCO 3 :Eu 3+ changed along with different types and amount of amphiphilic additional agents evidently. The particle size of Gly-CaCO 3 decreased to 1.383 µm when the volume ratio reached 8:2 (Gly:H 2 O). Photoluminescence (PL) spectra show that all the AA-CaCO 3 :Eu 3+ phosphors exhibit strong red emission peak originating from electric-dipole transition 5 D 0 → 7 F 2 (614 nm) of Eu 3+ ions and the amphiphilic molecules (Gly and SDS) had a huge influence on photoluminescence intensity.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Chenwei Liu,Xu Zeng,Ci Yan,Chenru Zhou,Mingzhong Li,Zhiyuan Wang
A hydrate directly growing and sintering on a pipe wall is an important hydrate deposition case that has been relatively unexplored. In the present study, the adhesion strengths of a sintered cyclopentane (CyC5) hydrate deposit under different solid precipitation and surface corrosion conditions were measured and discussed. It was found that the hydrate adhesion strengths increased by 1.2–1.5× when the soaking time of the carbon steel substrate in a 5 wt % NaCl solution increased from 24 to 72 h, which reduced the water wetting angle from 112 ± 3.5° to 94 ± 3.3°. The wax coating reduced the strength of CyC5 hydrate adhesion by up to nearly 20-fold by reversing the substrate wettability and affecting the hydrate morphology. The measurements performed on scales indicate that calcium carbonate scales strengthen the adhesion strength because of the decrease in the water wetting angle. In addition, honeycomb holes on the surface reduce amplification. Furthermore, settling quartz sand on the wall reduced the adhesion strengths by decreasing the effective sintering area of the hydrate on the underlying base. Finer sand and higher concentrations led to lower strengths. On the basis of the verified linear correlation between the hydrate adhesion strength and the adhesion work of droplets on different substrates and the influence of water conversion during deposition, both an equation and a key constant parameter were obtained to predict the sintered hydrate deposit adhesion strengths on substrates.
研究领域:
化学工程
·
材料科学
✓ 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）