FUEL
·
2022
·
IF 8.035
Qiaojuan Wang,Jianyue Wang,Wenjuan Rui,Dan Yang,Xiaoyue Wan,Chunmei Zhou,Renhong Li,Wen Liu,Yihu Dai,Yanhui Yang
Aqueous-phase reforming of biomass-derived formaldehyde is one of efficient and sustainable routes to generate molecular hydrogen as clean energy resource. In this work, Ag/MgCO 3 catalyst is prepared with constructed stable carbonate-modified metal-support interfaces. Under mild and neutral reaction conditions, it exhibits a near an order of magnitude higher low-temperature activity in formaldehyde reforming reaction for producing hydrogen in comparison with Ag/MgO. The catalytic and spectral observations reveal that the Ag/MgCO 3 -catalyzed reaction follows an O 2 -involved HCHO/H 2 O reforming reaction pathway through O 2 − , OOH and H radicals as highly active intermediates. Ag/MgCO 3 catalyst shows high rates in isotopic H 2 -D 2 exchange and HCHO/D 2 O reforming reactions and displays an apparent activation energy (E a ) as low as 7.5 kJ mol −1 within 10–50 °C, indicating facile activation of HCHO C H and H 2 O O H bonds. Furthermore, Ag/MgCO 3 catalyst adsorbs HCHO molecule in a favorable configuration and strength, as evidenced by the HCHO desorption profile. Comprehensive positive factors benefit to the superior hydrogen production activity of carbonate-modified Ag/MgCO 3 than Ag/MgO.
研究领域:
催化化学
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可再生能源
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xiaoqi Ban,Jin Yao,Wanzhong Yin,Yu Xie,Weifan Du,Taozhong Zhang,Yulian Wang
This study introduces N-[3-(Isodecyloxy)propyl]propane-1,3-diamine (IOPDA), a novel cationic surfactant, as a collector in the reverse flotation desilication of magnesite. It systematically evaluates IOPDA’s selective collecting performance in the flotation separation of magnesite from quartz. Single-mineral and artificial mixed mineral flotation experiments were conducted at pH 6.0 and an IOPDA concentration of 80 mg/L, where results showed significant improvements in flotation separation efficiency. The final concentrate achieved an MgO grade of 46.55 %, SiO2 grade of 1.97 %, and a quartz removal rate of 92.51 %. Compared to the conventional Dodecylamine (DDA), the flotation Selectivity Index (SI) and Separation Efficiency (SE) under IOPDA conditions were notably superior, demonstrating its enhanced selective collecting ability. To elucidate the selective adsorption mechanism of IOPDA, advanced techniques—such as contact angle measurements, Zeta potential testing, FTIR, XPS, AFM, and TOF-SIMS—were employed to analyze adsorption on magnesite and quartz surfaces. The study found that IOPDA preferentially adsorbs on the oxygen sites of quartz through electrostatic interactions and hydrogen bonding, while its adsorption on magnesite is weaker. This selective adsorption enhances the wettability difference between the minerals, facilitating highly efficient flotation separation.
研究领域:
矿物加工工程
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材料化学
·
界面化学
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产品关联
DOI
高影响因子
Water
·
2020
·Vol. 12
·期 4
·946
·
IF 2.544
Qiang Li,Song Wang,Lifang Wang,Li Zhang,Xiaohui Wan,Zhiguo Sun
Phosphorus recovery from industrial wastewater has attracted considerable interest. In this study, struvite crystallization method has been used for treatment of high phosphorus wastewater. The new combination agents of Mg5(CO3)4(OH)2·4H2O and NH4Cl were used as the precipitant. The effects of initial pH, n(Mg):n(P), n(N):n(P), and reaction time on the removal of total phosphorus (TP) in wastewater were investigated. The results showed that under the condition of initial pH = 4, Mg:N:P = 1.2:1.1:1, reaction time for 30 min, and static storage for 20 min, the residual amount of TP in wastewater was 2.98 mg /L, and the removal rate of TP reached 99.99%. The mass fraction of P2O5in the generated sediment reached 25.22%, equivalent to high grade phosphate ore and slow-release fertilizer, so as to realize the recycling and utilization of phosphorus in ultra-high phosphorous wastewater. This work will have practical application potential in treatment of high phosphorus wastewater and environmental management.Keywords:struvite crystallization method;environmental management;ultra-high phosphorus wastewater;basic magnesium carbonate;phosphorus recovery
研究领域:
环境工程
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废水处理
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资源回收
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2024
·
IF 2.7
Tongmengyao Jin,Jingyuan Ding,Xiaobao Li
To enhance the hydrophobicity of polylactic acid (PLA) composite, a novel alkali lignin/basic magnesium carbonate (AL-BMC) was prepared by carbon dioxide carbonization method. The interaction forces between AL and BMC, the morphology of AL-BMC, and the effect of the additive amount of AL-BMC on the hydrophobicity of PLA/alkali lignin/basic magnesium carbonate (PLA/AL-BMC) composites were investigated. The results of Fourier transform infrared spectra, X-ray diffraction pattern, and scanning electron microscope showed that there were hydrogen bonds between AL and BMC, the morphology of AL-BMC composites showed a flower-like structure, and the aggregation of basic magnesium carbonate was effectively inhibited by the hydrogen bonds between AL and BMC. The water contact angles of PLA/AL-BMC significantly increased with the addition of AL-BMC. Specifically, when the additive amount of AL-BMC was 20 %, the water contact angle of PLA/AL-BMC was 97.4°, which was higher than that of PLA/AL by 57.1 %. Therefore, the hydrophobicity of PLA/AL were effectively enhanced by the addition of AL-BMC composite filler. This study presents a novel strategy for enhancement of the hydrophobicity of PLA composite, utilization of lignin, and conversion of carbon dioxide.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 6
·2445
·
IF 3.4
Run Shi,Yuehan Hao,Deping Chen,Wenxin Liu
Reactive magnesia cement is considered an eco-efficient binder due to its low synthesis temperature and CO2absorption properties. However, the hydration of pure MgO–H2O mixtures cannot produce strong Mg(OH)2pastes. In this study, nesquehonite (Nes, MgCO3·3H2O) was added to the MgO–H2O system to improve its strength properties, and its hydration products and pore structure were analyzed. The experimental results showed that the hydration product changed from small plate-like Mg(OH)2crystals to interlaced sheet-like crystals after the addition of a small amount of Nes. The porosity increased from 36.3% to 64.6%, and the total pore surface area increased from 4.6 to 118.5 m2/g. At the same time, most of the pores decreased in size from the micron scale to the nanometer scale, which indicated that Nes had a positive effect on improving the pore structure and enhancing the compressive strength. Combined with an X-ray diffractometer (XRD), a Fourier transform infrared spectrometer (FTIR), and a simultaneous thermal analyzer (TG/DSC), the hydration product of the sample after Nes addition could be described as xMgCO3·Mg(OH)2·yH2O. When Nes was added at 7.87 and 14.35 wt%, the x-values in the chemical formula of the hydration products were 0.025 and 0.048, respectively. These small x-values resulted in lattice and property parameters of the hydration products that were similar to those of Mg(OH)2.Keywords:nesquehonite;reactive magnesia;Mg(OH)2;magnesium carbonate hydroxide;pore structure;nanopore
研究领域:
材料科学
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土木工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Guo Feng,Zhicheng Wang,Jun Mu,Feng Jiang,Yanqiao Xu,Qian Wu,Quan Zhang,Qing Hu,Jianmin Liu,Jian Liang
Herein, novel stabilized aluminum titanate whiskers were prepared via the molten salt method using alumina as the aluminum source, titania as the titanium source, magnesium carbonate as the stabilizer, and sodium molybdate as the molten salt. The influence of the amount of molten salt on the one-dimensional selectivity of the stabilized aluminum titanate whiskers was examined using XRD, SEM, TEM and other established testing methods, and the growth mechanism of aluminum titanate whiskers was discussed. The results confirmed that an excessive or insufficient amount of molten salt sodium molybdate is not conducive to the preparation of stabilized aluminum titanate whiskers. The optimum molten salt amount to be added is a molar ratio of 20% to aluminum titanate. A high yield of stabilized aluminum titanate whiskers, with diameters ranging from 20–60 μm and an aspect ratio >10 can be prepared by holding the sample at 1300°C for 6 h. The growth direction of the stabilized aluminum titanate whiskers is the [100] direction.
研究领域:
材料科学
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陶瓷学
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纳米材料
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晶体生长
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2899-2907
·
IF 3.665
Yisen Huang,Yiran Kong,Liwei Yan,Huawei Zou,Yang Chen,Mei Liang
Ablation-resistant polymeric composites play a crucial role in the thermal protection system for the entire aerospace industry. Constructing a stable char layer especially with low thermal conductivity is essential to enhance the ablation resistant properties of polymer-based ablatives. In this article, basic magnesium carbonate (MgCO 3 ) and carbon fibers (CFs) were introduced to silicone rubber with an aim of building fiber-supported micro-porous char structure in situ, thereby improving ablation resistance properties. Thermogravimetric analyses revealed that the addition of MgCO 3 significantly increased the char residue of the composites. Oxyacetylene torch tests indicated that the addition of MgCO 3 /CFs greatly improved the thermal insulation of the composites, and the linear ablation rates of the composites were reduced by 30.76% compared to the virgin silicone rubber. Shore A hardness and thermal conductivity tests revealed that composites with 10 phr MgCO 3 exhibited a char structure with proper strength and low thermal conductivity. SiC, Mg 2 SiO 4 , and MgSiO 3 were produced in the MgCO 3 /CFs-modified composites, as characterized by X-ray diffraction. Combined with macro lens and scanning electron misroscopy, it was proven that a fiber-supported micro-porous and thermally insulated char structure was conducive to the improvement of the ablation properties, which can be applied to aerospace systems for thermal shielding applications.
研究领域:
材料科学
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航空航天工程
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 32
·e01416
·
IF 2
Beibei Sun,Qiuyan Bi,Rujie Li,Jie Xu,Wanji Zhou,Shiai Xu
Graphical The graphical abstract illustrates that incorporating a synergistic system of AMC, MH, and ATH significantly enhances the flame retardancy and smoke suppression of SPVC. Unmodified SPVC shows intense burning and heavy smoke, while the ternary system reduces flame intensity and smoke release through endothermic decomposition, gas dilution, and protective char formation. The use of inorganic fillers to enhance the flame retardant properties of soft polyvinyl chloride (SPVC) often results in a trade-off with mechanical properties due to the relatively high filler content and inadequate dispersion within the polymer matrix. In this study, the combined synergistic effects of different inorganic flame retardants were explored to improve both flame retardancy and mechanical performance of SPVC simultaneously. First, the impact of anhydrous magnesium carbonate (AMC) content on the flame retardant and mechanical performance of SPVC was investigated. Results indicated that 60AMC/SPVC composites achieved the limiting oxygen index of 28.00% and a UL-94 rating of V-0. Additionally, the peak heat release rate showed a marked reduction of 38.75%, and the peak smoke production rate was reduced to 0.037 m 2 /s compared to SPVC. Second, the combined impacts of compound magnesium hydroxide, aluminum trihydrate, and AMC on flame retardancy and mechanical performance were investigated. The results demonstrated that compound SPVC composites exhibited a residual carbon content of 26.68%, approximately 1.5 times that of SPVC as magnesium hydroxide (MH), aluminum hydroxide (ATH), and AMC were added in equal proportions (1:1:1). The strategic use of inorganic fillers offers a straightforward and efficient approach for industrially preparing flame retardant SPVC composites.
研究领域:
高分子科学
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材料工程
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消防安全工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Furong Jia,Yun Li,Hongfei Guo,Xueqing Chen,Jilin Cao
Currently, comprehensive utilization technology of seawater bittern faces several challenges, including low resource utilization efficiency, limited value of magnesium salt products, and high energy consumption. This study proposes an innovative approach to prepare high-purity MgO. This process begins with the reaction of brine with a mixed alkaline solution of NaOH-Na 2 CO 3 to synthesize basic magnesium carbonate (4MgCO 3 ·Mg(OH) 2 ·4 H 2 O). Subsequently, 4MgCO 3 ·Mg(OH) 2 ·4 H 2 O is transformed into a high-purity Mg(OH) 2 structure through the hydrothermal conversion method. Finally, high-purity MgO is obtained by calcining magnesium hydroxide. The effects of mixed alkali precipitation and hydrothermal reaction conditions on the structure, morphology, and purity of intermediate products and MgO are systematically investigated. The optimal conditions for preparing high-purity MgO are determined as follows: the molar ratio of Mg 2 + :CO 3 2− :OH − in seawater bittern to the NaOH-Na 2 CO 3 mixed alkali is 5:4.7:2, at a reaction temperature of 60 °C, stirring speed of 200 rpm, stirring time of 10 min, and reaction time of 35 min. Under these conditions, spherical 4MgCO 3 ·Mg(OH) 2 ·4 H 2 O is initially obtained. Subsequently, the 4MgCO 3 ·Mg(OH) 2 ·4 H 2 O underwent hydrothermal treatment at a solid-to-liquid ratio of 8:100 and a temperature of 120 °C. Polyethylene glycol (PEG) is added as a surfactant at 3 wt % of the solid content of 4MgCO 3 ·Mg(OH) 2 ·4 H 2 O, along with 5 g of NaOH (accounting for 62.5 wt %), for 2 h. This process yielded high-purity Mg(OH) 2 with a thin flake morphology. Finally, the high-purity Mg(OH) 2 is calcined at 500 °C for 4 h, resulting in cubic crystal nano-MgO with a purity of 99.8 % and an average particle size of approximately 30 nm.
研究领域:
材料科学
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化学工程
·
无机合成
·
纳米技术
·
资源利用
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jiqun Li,Yan Zhang,Shiyu Song,Yifan Ma,Jianlin Yang
Membrane separation technology offers an ideal strategy for the efficient separation of emulsified oily wastewater by constructing superhydrophilic coatings on porous substrates. However, coatings exhibit more susceptible to fouling, leading to a decline in separation performance. Herein, a robust and durable superhydrophilic polydopamine/polyethyleneimine (PDA/PEI)-MgCO 3 mineralized coating with resistance to crude-oil fouling was successfully developed via co-deposition coupled with biomineralization. The mineralization effect of the PDA/PEI adhesive layer and organic dextran enabled uniform dispersion of inorganic MgCO 3 nanocrystals across PDA/PEI co-deposited substrates. More importantly, polypropylene membrane with PDA/PEI-MgCO 3 coating exhibited high separation flux (>925 L m −2 h −1 bar −1 ), exceptional efficiency (99.6 %), and long-term stable cyclic separation capability (98.9 % flux recovery) for crude-oil-in-water emulsions containing surfactant. Anti-crude-oil-fouling mechanism of the mineralized coating was further elucidated using density functional theory calculations. There is a strong adsorption interaction between the CO 3 2− in MgCO 3 and water molecules, demonstrating excellent hydration capacity. The synergistic effect of the hydrophilic CO 3 2− functional groups in the mineralized coating and the surface nanocomposite structure significantly enhances its hydration capacity, exhibiting exceptional resistance to crude-oil fouling. Additionally, the PDA/PEI-MgCO 3 coating demonstrates excellent chemical durability and prolonged stability, showing its strong potential for large-scale treatment of emulsified crude-oil-containing wastewater.
研究领域:
材料科学
·
化学工程
·
环境科学
·
纳米技术
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-20
·
IF 10.2
Yu Kexiao,Zhou Hang,Xu Yamei,Cao Youde,Zheng Yuanyi,Liang Bing
Malignant bone tumors result in high rates of disability and death and are difficult to treat in terms of killing tumors and repairing bone defects. Compared with other hyperthermia strategies, magnetic hyperthermia has become an effective therapy for treating malignant bone tumors due to its lack of depth limitations. However, tumor cells express heat shock protein (HSP) to resist hyperthermia, which reduces its curative effect. Competitive ATP consumption can reduce HSP production; fortunately, the basic principle of starvation therapy by glucose oxidase (GOx) is consuming glucose to control ATP production, thereby restricting HSP generation. We developed a triple-functional magnetic gel (Fe 3 O 4 /GOx/MgCO 3 @PLGA) as a magnetic bone repair hydrogels (MBRs) with liquid‒solid phase transition capability to drive magneto-thermal effects to simultaneously trigger GOx release and inhibit ATP production, reducing HSP expression and thereby achieving synergistic therapy for osteosarcoma treatment. Moreover, magnetic hyperthermia improves the effect of starvation therapy on the hypoxic microenvironment and achieves a reciprocal strengthening therapeutic effect. We further demonstrated that in situ MBRs injection effectively suppressed tumor growth in 143B osteosarcoma tumor-bearing mice and an in-situ bone tumor model in the rabbit tibial plateau. More importantly, our study also showed that liquid MBRs could effectively match bone defects and accelerate their reconstruction via magnesium ion release and enhanced osteogenic differentiation to augment the regeneration of bone defects caused by bone tumors, which generates fresh insight into malignant bone tumor treatment and the acceleration of bone defect repair.
研究领域:
生物医学工程
·
癌症治疗
·
骨组织工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Daoyong Lin,Zhifu Liu,Da Li,Jinjun Zhao,Yue Liu,Lei Cao,Guanxiang Ma,Wei Zhao
The Li 2 CO 3 -ammonia-ballmilling synthesis system of Li 4 Ti 5 O 12 (LTO) was optimized and doped Li and O by theirs adjacent elements Mg and F respectively. By adjusting the ballmilling parameter , the distribution of Li and Ti sources, the hydrolysis rate and different nucleophilic / electrophilic hydrolysis path of Ti , and the interaction between Li and Ti species can be effectively controlled. The temperature programmed calcination is beneficial to the formation of the middle state (Li 2 TiO 3 ), obtaining the high quality LTO. Mg and F doping can further optimize the hydrolysis and condensation degree of Ti source, the number of crystal nucleus and the particle size. Therefore, the initial first discharged capability of Mg doped LTO and F doped LTO reach to 152.4 mAh/g and 163.1 mAh/g at 5 C respectively, corresponding 32.4 % and 41.7 % enhancing compared to LTO (115.1 mAh/g). Moreover, the discharge voltage of LTO-Mg decreases from 1.5 V to 1.3 V.
研究领域:
材料科学
·
电化学
✓ 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）