MINERALS ENGINEERING
·
2022
·
IF 5.479
Long Wang,Weijian Lyu,Fuping Li,Jiaxin Liu,Hao Zhang
The efficient flotation separation of apatite and calcite is an intricate problem due to their similar physicochemical properties. The selection and utilization of selective depressant is the key to address this obstacle. In this study, sodium alginate (NaAl) was introduced as a selective inhibitor in the flotation separation of apatite from calcite with sodium oleate (NaOL) as collector. The inhibitory performance of NaAl on these two minerals was investigated via flotation tests. The depressing mechanism of NaAl was studied through zeta potential analysis, adsorption capacity tests, Fourier transform infrared spectroscopy (FTIR) measurements and X-ray photoelectron spectroscopy (XPS) analysis. Flotation results indicated that NaAl demonstrated strong inhibitory impact on the calcite flotation, whereas it presented little influence on the apatite flotation in the pH range of 9–12. A concentrate with P 2 O 5 grade and recovery of 34.32% and 82.27% respectively was obtained in the bench-scale flotation experiment. Zeta potential analysis demonstrated that NaAl strongly affected the following NaOL adsorption onto the calcite surface, whereas it showed little influence on apatite. Adsorption test showed that NaAl absorbed on both these two mineral surfaces, whilst the adsorption amount on the calcite surface was significantly higher than that on the apatite surface. FTIR and XPS analyses further confirmed that NaAl adsorbed on the apatite surface through weak physical adsorption, while it chemically adhered on calcite in the form of calcium carboxyl which greatly prohibited the subsequent adhesion of NaOL on calcite. As a consequence, the calcite floatability was greatly depressed by NaAl and the selective flotation separation of apatite from calcite was realized.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yuqi Ma,Anhe Wang,Jieling Li,Qi Li,Qingquan Han,Yafeng Jing,Xuefang Zheng,Hongyu Cao,Xuehai Yan,Shuo Bai
The self-assembling behavior of peptides and derivatives is crucial in the natural process to construct various architectures and achieve specific functions. However, the surface or interfacial self-assembly, in particular, on the surface of micro- or nanoparticles is even less systematically investigated. Here, uniform porous CaCO3 microparticles were prepared with different charged, hydrophobic and hydrophilic surfaces to assess the self-assembling behavior of dipeptides composed of various sequences. Experimental results indicate that dipeptides with a negative charge in an aqueous solution preferred to self-assemble on the hydrophobic and positively charged surface of CaCO3 particles, which can be ascribed to the electrostatic and hydrophobic interaction between dipeptides and CaCO3 particles. Meanwhile, the Log p (lipid–water partition coefficient) of dipeptides has a significant effect on the self-assembling behavior of dipeptides on the surface of porous CaCO3; dipeptides with high Log p preferred to self-assemble on the surface of CaCO3 particles, resulting in the improved cell internalization efficiency of particles with low cytotoxicity. After loading with a model drug (doxorubicin), the particles show obvious antitumor activity in animal experiments and can reduce Dox side effects effectively.
研究领域:
生物材料学
·
细胞生物学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
QinQin,Mei Li,Ping Lan,Yexin Liao,Shouxiang Sun,Hongquan Liu
In this study, chitin aerogel doped with nano-calcium carbonate (CaCO 3 /chitin aerogel) was prepared by dissolving chitin in Na 2 CO 3 /Ca (OH) 2 /urea system followed by epichlorohydrin (ECH) addition as a cross-linker and then freeze-drying of the hydrogel. The as-obtained CaCO 3 /chitin aerogel showed good adsorption properties toward the adsorption of Congo Red (CR) with maximum adsorption capacity reaching approximately 266.4 mg·g −1 . Besides, the adsorption capacity was affected by the initial concentration and pH. The adsorption kinetics revealed a second-order kinetics model of CaCO 3 /chitin aerogel toward CR, and the adsorption process was controlled by both the liquid film diffusion and intra-particle diffusion. In sum, chitin aerogel looks promising as an effective adsorbent for anion dye adsorption. The cost-effective and eco-friendly developed approaches are also of great interest for future environmental remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2021
·Vol. 56
·期 8
·2100012
·
IF 1.639
Qinjiang Zhao,Lihong Zhou,Jie Du,Guanghui Wang,Xiangjun Pei
As an ecological and environment-friendly building material, sticky rice mortar has attracted the attention of many researchers. Amylopectin is the most important organic matter of it, which can improve the mechanical properties and durability of sticky rice mortar by inducing mineralization of calcium carbonate (CaCO 3 ). However, amylopectin induced formation of CaCO 3 has not been reported. In this paper, mineralization of CaCO 3 induced by gelatinized amylopectin is investigated. For comparison, the different morphologies of CaCO 3 are studied in the presence of Mg 2+ , Fe 3+ . Moreover, these CaCO 3 products with different morphologies are used to clean the waste water. The results indicate that gelatinized amylopectin is conducive to formation of pumpkin-like vaterite. It forms uniform rod and dumbbell-shaped calcite in the presence of Mg 2+ , form calcite with stepped depressions in the presence of Fe 3+ . The adsorption of Pb(II) can reach extremely high level (1445.86 mg g −1 ) with the rod-like calcite.
研究领域:
材料科学
·
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Xingyuan Wang,Jiamin Qi,Hengxi Zhu,Jiancheng Wang,Heping Zeng,Bin Li,Si Yan
The aluminum industry is facing severe economic and environmental problems due to increasing carbon emissions and growing stockpiles of red mud (RM). RM is a strongly alkaline, high-emission solid waste from the alumina industry with potential for CO 2 sequestration. However, the effectiveness of RM carbon sequestration is poor, and the mechanism behind it is not well understood. In this study, the effect of microwave and tube furnace activation of RM on CO 2 sequestration in alumina was first investigated at different temperatures. The result showed that the CO 2 sequestration capacity of unmodified RM (URM) was only 14.35 mg/g at ambient temperature and pressure, and the CO 2 sequestration capacity could be increased to 52.89 mg/g after high-temperature activation and modification. Besides, high-temperature activation and modification will effectively improve the carbon sequestration capacity of RM. The carbonized RM was characterized by FT-IR, SEM, XRD , laser particle size, TG-DSC, and pH measurements. In addition, the mechanism of RM capturing CO 2 was also proposed, which shows that CO 2 was finally sequestered in the RM as CaCO 3 . The change in particle size distribution and the mineral phase in the RM indicated that high-temperature activation modification positively affects the application of RM to the sequestration of CO 2 . This study can provide a promising technology for the low-carbon and green development of the aluminum industry, as well as achieving the waste treatment and utilization objective.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.2
Kun Li,Xiaoxiao Li,Anqi Ming,Yiming Guo,Jun Sun,Hua Wang,Jianjun Ding,Xingyou Tian,Yuxiang Cao,Yuwei Lin
The properties of Pickering emulsions is affected by many factors, one of the most typical of which is the ionic environment. Existing studies have mainly focused on the effect of ions in the continuous phase on oil-in-water Pickering emulsions, and usually only single species of ions are studied. The water-in-oil Pickering emulsions are commonly used to encapsulate a variety of water-soluble functional substances, which often contain various of ions. Therefore, it is necessary to study the effect of ions in the internal phase on the properties of inverse Pickering emulsions. The inverse Pickering emulsions with an average droplet size of 100 μm were prepared using hydrophobized calcium carbonate particles. Subsequently, Na+ and Ca2+ were introduced into the internal phase to investigate their effects on the emulsion. The results show that the presence of Na+ can aggravate droplet coalescence, and Ca2+ can cause severe damage to the emulsions and even lead to phase inversion. It was speculated that Na+ can weaken the surface charge of particles by compressing the electric double layer, resulting in lower electrostatic repulsion between particles, thus changing the dispersion state of the particles and ultimately affecting the properties of the emulsion. And Ca2+ can combine with and release stearate from the particle surface through chemical reactions, thus changing the wettability of the particles and resulting in breaking and phase inversion of the emulsions. The present work is informative for the setting of the phase composition and the prediction of stability during the application of inverse Pickering emulsions.
研究领域:
化学
·
材料科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2019
·
IF 0
Liang Teng,Yimin Xuan,Yun Da,Xianglei Liu,Yulong Ding
The thermochemical energy storage based on Calcium looping (CaL) process shows great potential for the application in the 3 rd generation Concentrated Solar Power (CSP) compared to other high-Temperature heat storage schemes. However, due to the inherent low solar absorptance of CaCO 3 , the surface heating mode is widely adopted in the conventional CaL-CSP system, which causes large thermal resistance and severe radiative heat loss . Herein, we propose achieving direct solar absorption in the CaL-CSP system through enhancing the CaCO 3 ’s ability to capture thermal energy from the concentrated solar irradiation . Efforts are devoted to design and fabricate a modified CaL material by doping CaCO 3 with some materials with high solar absorptance . In order to obtain a highly stable CaL, the cyclic performance of the composite material is investigated and optimized. The calcium gluconate ((Ca(C 6 H 11 O 7 ) 2 )) was used as the precursor while fabricating the porous CaCO 3 , and the Mn–Fe oxides were doped into CaCO 3 through two different doping processes. The experimental results indicate that the proposed material obtains the solar absorptance of ∼90%. The heat release efficiency (equal to carbonation activity) remains over 92% in 60 cycles, which is much higher than that of the commercial CaCO 3 powder (20% after 60 cycles). The proposed calcium-based thermochemical energy storage material is expected to dramatically improve both the solar utilization efficiency and cyclic stability of the integrated CaL-CSP system.
研究领域:
储能技术
·
太阳能
·
材料科学
·
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Yao Feng,Wenwen Liu,Chaoqun Mu,Lvling Zhong,Zhixian He,Liang Zhang,Juanqin Xue
Several issues plague polymer and calcium carbonate (CaCO 3 ) composites, including the tendency of CaCO 3 particles to aggregate and detach easily, as well as a limited number of adsorption sites. To address the aforementioned issues, a novel large-particle hollow shell-structured PVA-encapsulated nano-CaCO 3 aerogel (PCC) was prepared. The characterization results indicate that the PCC (∼3 mm) possess a three-dimensional network structure with a stereoscopic arrangement of big and small pores. The adsorption of Pb(II) adheres to pseudo-first-order adsorption kinetics and the adsorption equilibrium follows the Langmuir model with a maximum adsorption capacity of 482.85 mg/g at 313 K for Pb(II). The PCC exhibits good selectivity and stability of adsorption towards Pb(II), retaining 92.6 % of its initial adsorption capacity after seven cycles. The large-particle morphology of this material demonstrates significant potential for effectively removing Pb(II) in wastewater treatment applications.
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
ACS Applied Bio Materials
·
2021
·
IF 0
Pengzhong Shi,Daozhen Zhou,Yaxin Zhu,Bo Peng,Nannan Shao,Xingjie Zan
Fast hemostasis, biosecurity, and adaptation of different bleeding sites are the major challenges for hemostatic materials. In this work, an easy-to-make, rapid hemostatic, tannic acid doped calcium carbonate microsphere with a low concentration of thrombin (Thr@TA-CaCO3) was developed. In an in vitro blood clotting assay, the hemostatic effect of Thr@TA-CaCO3 varied with the change of thrombin amount. Furthermore, the average hemostatic time can be reduced from 205 to 20 s as the thrombin levels are elevated. When applied in different hemorrhage models, the Thr@TA-CaCO3-treated group had a lower blood loss than the tannic acid modified CaCO3 (TA-CaCO3) groups. Especially in the rabbit artery injury model, the total bleeding amount in the Thr@TA-CaCO3-treated group was only 11.97% of that in the TA-CaCO3 groups, proving that Thr@TA-CaCO3 had an excellent hemostatic effect even in the case of rapidly flowing blood. Based on the above, Thr@TA-CaCO3 is a promising hemostatic agent and can be applied in more extensive clinical applications.
研究领域:
生物医学工程
·
材料科学
·
血液学
✓ 已验证
DOI
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2016
·
IF 3.902
Qiwei Zhong,Wenhua Li,Xiuping Su,Geng Li,Ying Zhou,Subhas C. Kundu,Juming Yao,Yurong Cai
Despite superior clinical handling, excellent biocompatibility, biodegradation property of calcium phosphate needs to be improved to coincide with the rate of new bone formation. In this study, spherical CaCO 3 are fabricated in the presence of the silk sericin and then transformed into porous hydroxyapatite (HAP) microspheres via hydrothermal method. The degradation behavior of obtained CaCO 3 , HAP and their mixture is first investigated in vitro . The result demonstrates that the weight loss of HAP microspheres are almost 24.3% after immersing in pH 7.40 Tris-HCl buffer solution for 12 weeks, which is far slower than that of spherical CaCO 3 (97.5%). The degradation speed of the mixtures depends on the proportion of CaCO 3 and HAP. The mixture with higher content of CaCO 3 possesses a quicker degradation speed. The obtained CaCO 3 and HAP microspheres are injected into subcutaneous tissue of ICR mice with the assistance of sodium alginate. The result in vivo also shows an obvious difference of degradation speed between the obtained CaCO 3 and HAP microspheres, implying it is feasible to modulate the degradation property of the mixture through changing the proportion of CaCO 3 and HAP The good cytocompatibility of the two kinds of microspheres is proved and a mild inflammation response is observed only at early stage of implantation. The job offers a simple method to modify the degradation properties of biomaterial for potential use in bone tissue engineering.
研究领域:
材料科学
·
生物材料
·
组织工程
✓ 已验证
DOI
PubMed
高影响因子
GIANT
·
2020
·
IF 0
Xinyi Jin,Jinqiao Xue,Dong Hee Kang,Yujing Liu,Jie Ren,Quan Wen,Dapeng Hu,Yan Yu,Wei Yang,Binyang Du,Myung-Han Yoon,Hanying Li
Single crystals have been shown to incorporate guest materials (e.g., gel networks and functional particles) and the incorporated materials endow the crystal hosts with non-intrinsic properties. The acquisition of the non-intrinsic crystal properties impels us to diversify the incorporated guest materials and thus to spread the potential applications of single-crystalline materials. Here, fluorescent NIPAM-based microgels have been selected as the guest materials to be incorporated into the crystal hosts. In the presence of microgels, calcite crystallize from either solution or gel media have been examined. Solution-grown crystals exclude the microgels, while two gel-grown methods have proved effective for incorporating these microgels inside calcite single crystals. On one hand, an additional macroscopic agarose gel-network is introduced to trap the microgels. Crystallization in the agarose gel leads to incorporation of agarose gel-network together with the trapped microgels. The microgel concentration in the crystal reaches 33 mg/mL. On the other hand, dispersions of microgels are concentrated to about 352 mg/mL and the microgels aggregate into non-flowing macroscopic gels (termed as macrogels). Crystallization in a macrogel results in its incorporation. By showing the incorporation of microgels through physical entrapment, this work provides a new platform to functionalize single crystals by the microgels.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
Applied Sciences-Basel
·
2025
·Vol. 15
·期 8
·4225
·
IF 2.5
Shaotao Xu,Liang Xu,Senhao Wang,Hanxi Wang,Sunhua Deng,Han Wang
In order to explore the potential catalysts for kerogen pyrolysis and to clear away obstacles to product liberation in product recovery, the facilitation effects of acidic chlorinated salts (MnCl2·4H2O, AlCl3·6H2O, CrCl3·6H2O, and MoCl5) on pyrolysis behavior of Huadian oil shale (OS) were investigated. Two different ways of wet mixing and dry mixing were used, and indoor pyrolysis experiments were carried out to characterize the different products collected by multiple analyses. The acidic chloride solution could effectively remove large amounts of calcite from OS during wet mixing, whereas the calcite in the dry-mixed samples decomposed significantly during pyrolysis, releasing significant amounts of CO2. AlCl3could improve the pore space by removing carbonates, which can promote the pyrolysis of kerogen and increase oil yield. The improved pore space can also promote the conversion of kerogen and the release of hydrocarbon products, while the large amounts of CO2released during pyrolysis of dry-mixed samples can promote the migration of heavy fractions. This study emphasizes the great potential of acid chlorates in counteracting reservoir blockage and facilitating pyrolysis for OS in situ exploitation.
研究领域:
石油工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）