CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Wenbo Wang,Guangyan Tian,Zhifang Zhang,Aiqin Wang
Silicate materials have been frequently used as stable, low-cost and efficient adsorbents for the removal of dyes and heavy metal ions from aqueous solution. Herein, at the aim of designing new adsorbent with higher adsorption capacity, natural palygorskite (PAL) was modified via a one-step hydrothermal process by introducing sodium silicate and magnesium salts. The effect of Si/Mg dosage ratio on the structure and physico-chemical features of the adsorbent was investigated, and its adsorption capability for Methylene blue (MB) and Cu(II) ions was intensively evaluated. It was found that Si/Mg dosage ratio is the key to control the adsorption properties of the adsorbent. The active magnesium silicate could be formed around PAL at the moderate Si/Mg dosage ratio, and even the undesirable quartz impurities without adsorption activity in the natural PAL minerals may transform as amorphous magnesium silicate with higher adsorption activity in this process. The adsorbent shows greater BET specific surface areas (407.3 m 2 /g), ideal surface charge distribution and superior adsorption capacity to MB and Cu(II) ions, with the maximum adsorption capacity of 527.22 mg/g for MB and 210.64 mg/g for Cu(II) ions at the Si/Mg dosage ratio of 2:1. The MB molecules and Cu(II) ion could be almost completely removed from 100 mg/L of MB solution and 25 mg/L of Cu(II) solution by the adsorbent, respectively, which is far away higher than that of raw PAL. The electrostatic attraction, ion exchange and chemical association of –Si–O − groups contribute to the enhanced adsorption for MB or Cu(II) ions.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Shuxin Huang,Jian Feng,Junxia Yu,Yi Wang,Jiequan Liu,Ruan Chi,Haobo Hou
Release of the remaining ammonium salts from the weathered crust elution-deposited rare earth ore (WCE-DREO) would pose a serious threat to the environment. Thus, in this study, the adsorption and desorption performances of the WCE-DREO and four minerals that composed it were investigated to select an efficient eluent for the remained ammonium removal. Results showed that the ammonium ion adsorbed on the WCE-DREO and the clay minerals as a monolayer, and the calculated adsorption capacities were as follows: montmorillonite > WCE-DREO > halloysite > illite > kaolinite due to their different structure. pH experiment showed that it had great effects on ammonium adsorption on both the WCE-DREO and the investigated clays. Kinetic experiments showed that ammonium sorption and desorption process were both a fast process. Co-ions experiments showed that Mg 2+ showed the highest inhibition effect on the ammonium adsorption on the WCE-DREO due to its ionic character. Based on this data, magnesium salt was chosen as the eluent, and results showed that more than 93 % of the remaining ammonium ion could be removed from the WCE-DREO in the batch and column experiments.
研究领域:
环境科学
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矿物学
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
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2016
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IF 2.29
Yue Yang,Boyi Xie,Ruixiang Wang,Shengming Xu,Jianlong Wang,Zhenghe Xu
The utilization of high-phosphorus tungsten ores has attracted extensive attention with the mining and utilization of rich tungsten ores. To extract and separate tungsten from acidic high-phosphorus solution effectively, a novel process was developed. Firstly, tungsten was extracted directly in acid medium by solvent extraction . 99.8% tungsten in acidic high-phosphorus solution was extracted with Aliquat 336 in kerosene by one extraction stage under the conditions of O:A = 1, pH = 2, 25 °C, t = 10 min, 5% v/v 2-Octanol and 10% v/v Aliquat 336. And then, tungsten and phosphorus were preliminary separated through stripping process. Over 95% tungsten were recovered after five stripping stages under the optimum stripping conditions of 2.5 M ammonium bicarbonate , 8 min stripping time, O:A = 1:1, pH = 9, and 60 °C, but only about 1.2% phosphorus was recovered from feed liquor. Finally, a small amount of phosphorus left in strip liquor was deeply removed by magnesium salt precipitation method on the optimum conditions of pH = 10.0, 25 °C, reaction time 1 h and Mg/P molar ratio of 1:2 and the ammonium tungstate solution meeting the requirements of producing high-quality ATP can be obtained successfully. Compared to traditional phosphorus removal route, the process in this paper can help extract tungsten directly in acidic medium and decrease the quantity of phosphorus through extraction-stripping process, significantly reducing the consumption of alkali and magnesium salt and improving the separation efficiency of tungsten from acidic high-phosphorus solution.
研究领域:
冶金化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
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2025
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IF 13.1
Xin Liu,Dining Li,Mingqi Li,Hui Xie,Xiaohan Yu,Haochuan Wang,Wei Wang,Jinxiang Hong,Zuhua Zhang,Pan Feng
Magnesium salts are key components of liquid alkali-free accelerator; however, their influence on the setting and hardening of accelerated cement pastes remains unclear. This study systematically investigates the role of different magnesium salts by preparing and examining aluminum sulfate (AS)-based accelerators at different dosages. The effects of the accelerators on the setting and early age mechanical properties of the cement pastes were comparatively studied. Results revealed that the type and dosage of magnesium salts significantly affected these properties. Specifically, MgSiF 6 substantially accelerated the cement paste setting, albeit at the expense of early age mechanical strength, owing to its considerable delay in C 3 S hydration. Conversely, both Mg(NO 3 ) 2 and MgSO 4 slightly shortened the setting time while improving the 6 h compressive strength, which was attributed to the facilitation of C 3 S hydration and refinement of the cement pore structure. Further analysis of ettringite formation, growth and chemical composition indicated that the low pH environment induced by MgSiF 6 promoted the incorporation of magnesium and fluoride ions into ettringite, leading to the formation of higher-aspect-ratio crystals. This morphological change enhanced the percolation network, thus accelerating cement setting. These findings advance our understanding of the setting and hardening mechanisms of accelerated cement pastes and offer valuable guidelines for optimizing accelerator formulations.
研究领域:
材料科学
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土木工程
✓ 已验证
产品关联
DOI
高影响因子
NEW CARBON MATERIALS
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2017
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IF 1.02
Shu-zhang Niu,Si-da Wu,Wei Lu,Quan-hong Yang,Fei-yu Kang
Porous carbon materials can increase the conductivity of sulfur and restrain the shuttling of polysulfides in the electrolyte. A hierarchical microporous-mesoporous carbon (HMMC) with a large surface area and pore volume was prepared by the simple one-step carbonization of a mixture of magnesium gluconate (MG) and phenolic resin. The MG was transformed into nanosize magnesium oxide that acted as a hard template during carbonization to create mesopores. The HMMC has a high surface area (∼1 560 m 2 g −1 ) and large pore volume (∼2.6 cm 3 g −1 ), which provides abundant space for sulfur loading and accommodates volume changes during charge/discharge. The interconnected pore structure and carbon framework ensure fast electron and Li ion transfer. As the cathode of a Li-S battery the sulfur-loaded HMMC has a high discharge capacity of 939 mAh g −1 at 0.3 C and a reversible capacity of 731 mAh g −1 after 150 cycles with only a 0.15% capacity fade per cycle. Even at a high rate of 2 C, it still delivers a high discharge capacity of 626 mAh g −1 , showing an excellent rate performance.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Immunology Research
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2021
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IF 4.818
Lin Zhang,Lukun Yang,Xiaowei Xie,Hongyue Zheng,Hangsheng Zheng,Lizong Zhang,Cuizhe Liu,Ji-Gang Piao,Fanzhu Li
Baicalin (BA) magnesium salt (BA-Mg) is a good water-soluble ingredient extracted from Scutellaria baicalensis Georgi, a commonly used traditional Chinese medicine. This study is aimed at investigating whether BA-Mg could exert a better protective effect on lipopolysaccharide- (LPS-) induced acute lung injury (ALI) in mice and illuminate the underlying mechanisms in vivo and in vitro. Mice were intraperitoneally administrated with equimolar BA-Mg, BA, and MgSO4 before LPS inducing ALI. Lung tissues and bronchoalveolar lavage fluid were collected for lung wet/dry ratio, histological examinations, cell counts, and biochemical analyses at 48 h post-LPS exposure. Meanwhile, the protein expressions of TLR4/NF-κB signaling pathway and proinflammatory cytokines in lung tissues and lung bronchial epithelial cells (BEAS-2B) were detected. The results showed BA-Mg pronouncedly ameliorated LPS-induced inflammatory response and histopathological damages, elevated antioxidant enzyme activity (SOD), and downregulated myeloperoxidase (MPO) and malonaldehyde (MDA) levels through the inhibition of TLR4/NF-κB signaling pathway activation. Moreover, the effect of BA-Mg was significantly better than that of BA and MgSO4 in ameliorating symptoms. Overall, BA-Mg can effectively relieve inflammatory response and oxidative stress triggered by LPS, indicating it may be a potential therapeutic candidate for treating ALI.
研究领域:
药理学
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免疫学
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肺病学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2023
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IF 8.8
Ying-zhuo Shen,Zheng Wang,Kangping Ning,Chuanli Ren,Dandan Yang,Xiao-Ya Hu,Qin Xu
A highly sensitive and selective split-type perovskite-based photoelectrochemical (PEC) platform was developed for measuring alkaline phosphatase (ALP) activity in milk and serum samples. ALP in the test sample hydrolyzed 2-phosphate sesquimagnesium salt hydrate (AAPS) in a 96-microwell plate to produce ascorbic acid (AA), a PEC electron donor. The resulting AA, which could preferentially annihilate the photogenerated holes, indirectly reflects ALP activity. The PEC used a cetyltrimethylammonium bromide (CTAB)-functionalized CH 3 NH 3 PbI 3 ( [email protected] 3 NH 3 PbI 3 ) film as the cathode to monitor the controlled AA production. Due to the excellent photoelectric characteristics of the CH 3 NH 3 PbI 3 perovskite and the split-type assay, excellent sensitivity and selectivity for ALP detection were obtained. Under the optimum experimental conditions, ALP activity with a limit of detection (LOD) of 2.6 × 10 −4 U/L in a linear dynamic range of 10 −3 ∼ 10 2 U/L was obtained. With its sensitive, rapid, and high-throughput detection capabilities, this split-type and label-free PEC platform has great potential for use in food and biomedical analysis.
研究领域:
分析化学
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生物化学
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生物医学工程
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食品科学
✓ 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）