JOURNAL OF SOILS AND SEDIMENTS
·
2024
·Vol. 24
·期 11
·3641-3655
·
IF 2.8
Huang Haofeng,Lin Qintie,Liu Jiaxin,Wei Longyi,Liu Yuxin,Zheng Junli,Lei Haoxin,Chen Tingxi,Luo Hao
Purpose The purpose of the study is to develop remediation technology for soil with arsenic and lead composite pollution by leaching. Arsenate carries a negative charge in soil, while lead carries a positive charge in soil, causing soil remediation more challenging. There is an urgent need to develop a remediation method that can efficiently remove both arsenic and lead simultaneously. Methods A complex agent composed of potassium pyrophosphate (PP) and potassium hypophosphite (PHP) was applied to the Soil A (As soil samples) and B (As-Pb soil samples). The research methods identified the optimal condition of As and Pb removal efficiency by concentration, molar ratio, liquid‒solid ratio, washing time and pH. The mechanism of the experiment is studied through Wenzel/BCR method analysis, I R and M F analysis, leaching toxicity and soil physicochemical properties analysis. Results The results show that the removal of arsenic from Soil A and B was 71.53% and 68.27% by 0.5 mol·L −1 PP and 0.2 mol·L −1 PHP, L/S = 10:1(L/S is liquid–solid ratio, volume ratio of agent to soil), t = 10 h, pH = 5.0. The removal of Pb in Soil B reached 74.89% by 0.6 mol·L −1 PP and 0.3 mol·L −1 PHP, L/S = 15:1, t = 8 h, pH = 7.0. According to Wenzel method, the complex agent converts specific adsorption into nonspecific adsorption state of As by Fe–P complexes through complexation and reductive dissolution of iron oxide. In addition, PP increases the efficiency of lead leaching by preventing the formation of Ca 2 Pb 3 (PO 4 ) 3 Cl, and PHP promotes the reductive dissolution of galena (PbS). Conclusions The mechanism involves competitive adsorption, inner-sphere complexation, reduction dissolution and electron transfer. The effect of pH on removal efficiency was significant. The optimal removal pH for As is weakly acidic, while the Pb removal efficiency is optimized under neutral conditions. There is synergy between PP and PHP in regard to removal of As and Pb in soil.
研究领域:
环境科学
·
土壤化学
·
污染控制
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DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 13
·4583
·
IF 3.4
Hao Wang,Guihua Ma,Ke Zhang,Zhi Jia,Yuzhuo Wang,Li Gao,Bingxin Liu
Salt lake brine originating from Qinghai, China has abundant cesium resources and huge total reserves. The inorganic ion exchangers ammonium molybdophosphate (AMP) and zirconium phosphate (ZrP) have the significant advantages of separating and extracting Cs+as a special adsorbent. Nevertheless, their high solubility in water leads to a decrease in their ability to adsorb Cs+in aqueous solutions, causing problems such as difficulty with using adsorbents alone and a difficult recovery. In this work, an environmentally friendly polyurethane sponge (PU sponge) with a large specific surface area is employed as an adsorbent carrier by physically impregnating dopamine-coated AMP and ZrP onto a PU sponge, respectively. The experiment found that under the same conditions, the AMP/PU sponge performs better than the ZrP/PU sponge for Cs+adsorption. When the amount of adsorbent reaches 0.025 g, the adsorption capacity reaches saturation. The adsorption efficiency remains above 80% when the concentration of Cs+is 5–35 mg/L. The kinetic calculations show that adsorption is spontaneous, feasible, and has a higher driving force at high temperatures. In addition, the power and mechanism of the interaction between adsorbent and adsorbent are explained using the density functional theory calculation. This efficient, stable, and selective Cs+adsorbent provides design guidelines.Keywords:Cs+adsorption;polyurethane sponge;ammonium molybdophosphate;zirconium phosphate
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Jinyu Chen,Yunxia Ren,Kunsheng Zhang,Youling L. Xiong,Qing Wang,Kun Shang,Dian Zhang
Formation of protein gels in processed muscle foods is one of the most important functionalities. To explore the mechanisms responsible for affecting gel properties of muscle proteins by phosphates, myofibrillar protein (MP) from mantis shrimp ( Oratosquilla oratoria ) was treated with sodium tripolyphosphate at three pH values (7.0, 8.0, and 9.0). FTIR and UPLC-MS/MS firstly confirmed that phosphate groups were introduced to MP through C O P bonds via serine and threonine residues. The incorporation of STP caused increased electronegativity and solubility, more stable α-helix secondary conformation, and reduced tryptophan fluorescence intensity of MP, especially at pH 8.0 and 9.0. These changes led to a finer, ordered and denser three-dimensional gel network microstructure with higher gel strength and elasticity, and water-holding capacity. This study demonstrated that the introduction of phosphate groups could increase negatively charged residues in MP, enhance the crosslinks of proteins through ionic interaction, and promote gel network formation.
研究领域:
食品科学
·
蛋白质化学
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DOI
PubMed
高影响因子
JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2016
·Vol. 41
·期 3
·e12915
·
IF 0.894
Meng Xu,Wei Liu,Yawei Zhang,Zengqi Peng,Xiuyun Guo,Fulong Wang
Orthophosphate (Pi), tetrasodium pyrophosphate (PP) and sodium tripolyphosphate (TPP) in the polyphosphatases and longissimus thoracis from beef were detected by ion chromatography. Under pure solution models, tripolyphosphatase (TPPase) interacted with pyrophosphatase (PPase). Single TPP hydrolysis was slower than the polyphosphate blend (the ratio of PP, TPP and sodium hexametaphosphate was 3:4:3). Within 4 h, 0.0896 g/L of TPP remained in the TPP + PPase + TPPase system, while it was hydrolyzed completely in the polyphosphate blend + PPase + TPPase system, which was different under minced meat models. The PP, TPP and polyphosphate blend were hydrolyzed slowly under minced meat models. The acceleration or deceleration of the entire polyphosphates hydrolysis process could be due to the ratio of PPase to TPPase and their activities. These results could be useful in the development of an optimal ratio of polyphosphate mixture for the meat and meat products in food industry. Practical Applications Polyphosphates play an important role in meat processing. They can increase the water holding capacity of muscle proteins, reduce cooking loss, improve meat tenderness and gel properties, and affect the ability to emulsify. It is commonly used commercially as a blend of various polyphosphates (including tetrasodium pyrophosphate, sodium tripolyphosphate and sodium hexametaphosphate) in meat processing. There have been few reports on the mechanism through which polyphosphate blend improve the functionalities of muscle proteins. In this work, the dynamic changes in the hydrolysis of tetrasodium pyrophosphate, sodium tripolyphosphate and polyphosphate blend under purified polyphosphatases and longissimus thoracis from beef using free reagent ion chromatography was observed. This could be helpful in understanding the mechanism of polyphosphate hydrolysis and in developing an optimal ratio of polyphosphates blends for meat and meat products in industry.
研究领域:
食品科学
·
生物化学
·
肉类技术
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Huaixian Xiao,Na Liu,Ke Tian,Shixiang Liu,Fei Ge
Nanoparticles have been reported to induce toxicity to aquatic organisms, however, their potential impacts on phosphorus removal from wastewater by algae are unclear. In this study, the effects of nanoparticle ZnO (nano-ZnO) on phosphate (PO 4 3− ) removal by a green alga Chlorella vulgaris were investigated. We found that PO 4 3− removal efficiency was accelerated with high concentrations of nano-ZnO (0.04–0.15 mM) but reduced with low concentrations of nano-ZnO (0.005–0.04 mM) compared to the control (without nano-ZnO), suggesting that PO 4 3− removal efficiency by C. vulgaris was related to nano-ZnO concentrations. Moreover, we observed changes of nano-ZnO morphology and detected element P on the surface of nano-ZnO by using transmission electronic microscopy (TEM) combined with energy dispersive X-ray spectroscopy (EDX), indicating that PO 4 3− was interacted with nano-ZnO or the dissolved Zn 2+ from nano-ZnO. Furthermore, we confirmed this interaction induced the formation of Zn 3 (PO 4 ) 2 crystallites sedimentation by employing X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS), which finally accelerates the removal of PO 4 3− .
研究领域:
环境科学
·
水处理
·
藻类生物学
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Huiqing Xiang,Jiankun Nie,Zhicheng Zhou,Yang Yang,Zihao Yu,Jianguo Liu
In recent years, selective metallization on polymer surfaces has attracted considerable attention due to its excellent properties and wide applications. This paper reports that copper phosphate (Cu3(PO4)2) or nickel phosphate (Ni3(PO4)2) was selected as laser-active material to successfully fabricate metallic patterns on ordinary polymer substrates by laser direct activation and electroless plating. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were utilized to characterize the interaction mechanism between a nanosecond-pulsed laser (355 and 1064 nm wavelengths) and Cu3(PO4)2 or Ni3(PO4)2. It was found that after 355 or 1064 nm laser activation with appropriate parameters, Cu+ was generated from Cu3(PO4)2, and NiO was generated from Ni3(PO4)2. At the same time, Cu+ or NiO adsorbed on the porous sponge-like microstructure of modified polycarbonate (PC), respectively, and acted as catalytic active centers to realize selective copper deposition in the laser-activated zone. Furthermore, the obtained copper layers were confirmed to possess good selectivity, electrical conductivity, and high adhesion strength (the highest grade of 5B). Moreover, from comparisons of Cu3(PO4)2 with Ni3(PO4)2 and of 355 nm laser activation with 1064 nm laser activation, the 1064 nm laser activation of Cu3(PO4)2 produced the most catalytic seeds (Cu+) and had the best catalytic effect.
研究领域:
材料科学
·
表面工程
·
光学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FIRE SCIENCES
·
2023
·
IF 1.9
Chenran Fan,Lijuan Wei,Shicheng Zhao
To improve the flame retardant efficiency of intumescent flame retardants, some nano-scale additives as synergists were always added. In this work, nano silicon and piperazine pyrophosphate/melamine polyphosphate into polypropylene was investigated, which was obviously efficient to improve thermal stability and flame retardancy. The optimal synergistic ratio corresponded to 1 wt% SiO2, 10 wt% piperazine pyrophosphate, and 5 wt% melamine polyphosphate. The system passed the UL-94 V-1 classification and had a limiting oxygen index value of 34.5%. It exhibited a decrease on peak heat release rate and peak smoke production rate by 81% and 80%, respectively. Based on characterizations of scanning electron microscope, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the synergistic mechanism was investigated. A reactive cross-linking network between SiO2 and piperazine pyrophosphate/melamine polyphosphate during burning was formed to enhance the structure of carbon protective layer. Nano silicon acted as a foaming nucleating agent to promote the formation of porous dense carbon layer in intumescent flame retardants during burning. The synergistic strategy of SiO2 and piperazine pyrophosphate/melamine polyphosphate provided new compounded system for the design of polymeric materials with excellent flame retardancy, great thermal stability, and low release of heat and smoke.
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 22
·8042-8053
·
IF 5.7
Xiaotong Chi,Dairong Chen,Ting Wang,Xiuling Jiao
Electrochromic devices have gained great attention owing to their potential application in fields such as smart windows, glassware, and low-cost displays. Recent investigations have shown that the nickel phosphate films (NiHPO4·3H2O, NiHP films) are highly promising for the fabrication of large-area smart windows with large optical modulation. However, the performances such as the color switching time, coloration efficiency and cycling stability of such films are not ideal and need further investigations. In this study, we propose a layer-by-layer electrodeposition method for the fabrication of a composite metal phosphate film. A CoHPO4 layer is first deposited on the ITO glass as the frame, and then NiHPO4 is further electrodeposited on the CoHPO4 frame as an electrochromic active layer. The resulting film with NiHPO4 on CoHPO4 (CoHP/NiHP film) exhibits an optical modulation of 65.55%, a fast color switching time (tc/tb 2.0/8.5 s, the coloring time is three times faster than that of the pure NiHPO4 film), a high charge capacity (81.36 mF cm−2), excellent memory effect (10.53% attenuation after 5000 s), a high coloration efficiency (140.37 cm2 C−1, it is twice that of the pure NiHPO4 film) and 5 times improved outstanding cycling stability compared with the pure NiHPO4 film (1400 cycles with retained performance). The uniform nanosheet morphology of CoHPO4 provides a large active area for the electrochromic response. Meanwhile, the electrochemical investigations indicate that, compared with the pure NiHPO4 film, the NiHPO4 on CoHPO4 composite structure shows much faster electrical dynamics with diffusion coefficient values of OH− increased by an order of magnitude. The larger active area and much faster electrical dynamics promote the electrochromic performances of the metal phosphate films. Our findings may help in the development of metal phosphate films with high electrochromic performances. The layer-by-layer electrodeposition strategy may help to develop new types of electrochromic materials.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Yuxuan Cheng,Jing Ru,Chaobo Feng,Xiaohao Liu,Hua Zeng,Shuo Tan,Xi Chen,Feng Chen,Bing-Qiang Lu
The constituent ions of calcium phosphate in body fluids are in the supersaturated state and tend to form minerals physiologically or pathologically. Inorganic pyrophosphate (PPi) has been considered as one of the most important inhibitors against the formation of calcium phosphate minerals. However, serum PPi concentrations in humans are maintained at a level of several μmol/L, and its effectiveness and mechanism for mineralization inhibition remain ambiguous. Therefore, this work studied the mineralization process in an aqueous solution, explored the effective inhibitory concentration of PPi by titration, and characterized the species during the reactions. We find that PPi at a normal serum concentration does not inhibit mineralization significantly. Such a conclusion was further confirmed in the PPi-added serum. This work indicates that PPi may not be a major direct inhibitor of mineralization in serum and possibly functions via alternative mechanisms.
研究领域:
生物化学
·
生物矿化
·
无机化学
✓ 已验证
DOI
PubMed
高影响因子
Soft Matter
·
2021
·Vol. 17
·期 17
·4604-4614
·
IF 3.679
Meihua Gao,Na Du,Zhiyin Yao,Ying Li,Nan Chen,Wanguo Hou
Monoalkyl phosphates (MAPs) are one kind of important single-chain weak acid/salt type surfactants, but the understanding of their aggregation behavior in water is very limited due to their insolubility at room temperature. In the current work, the effect of guanidinium salts (GuSalts) on the solubility of sodium monododecylphosphate (SDP), a typical MAP, in water was determined at 25.0 °C, and the aggregation behavior of SDP in the GuSalt/water mixtures was investigated. The solubility of SDP is significantly improved by GuSalts including GuCl, GuSO4, GuSO3, GuPO4, and GuCO3 at 25.0 °C, resulting in an isotropic phase. SDP vesicles are spontaneously formed in the isotropic phase, with a critical vesicle concentration of ∼1.0 mM independent of the type of GuSalts. A “bridging dimer” mechanism is proposed to explain the formation of SDP vesicles. The SDP vesicles have a unilamellar structure with a size of ∼80 nm and an alkyl interdigitated degree of ∼25%, and exhibit size-selective permeability. Interestingly, a temperature-induced reversible transition between vesicles and α-gels was observed for the SDP/GuSalt/H2O systems when the SDP content is higher than 20 mM. The α-gels obtained are composed of vesicles and bilayer sheets, showing similar viscoelasticity to conventional gels, although their water content is as high as ∼98 wt%. The microviscosity of SDP vesicle membranes (ca. 35.79–49.34 mPa s at 25.0 °C) and the transition temperature between vesicles and α-gels (ca. 21.0–22.8 °C) are all dependent of the type of GuSalts. This work deepens the understanding of the aggregation behavior of MAPs and also provides valuable information for their practical applications.
研究领域:
生物化学
·
软物质科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Kunqi Liu,Junxia Wang,Jin Wang,Die Liu,Long Kang,Haiyuan Wei,Junjun Zhou
In this study, the 500 keV He–ion irradiation effects were systematically analyzed in Sr 0.5 Zr 2 (PO 4 ) 3 –Ce 0.5 Sm 0.5 PO 4 composite ceramics used for nuclear waste form. The phase evolution was investigated at various ion doses of 1 × 10 16 , 1 × 10 17 , and 5 × 10 17 ions/cm² using GIXRD, Raman. Meanwhile, the irradiation effects at various depths of 100 nm, 1500 nm and 3000 nm in the typical sample with an ions dose of 5 × 10 17 ions/cm 2 were further observed through FIB–TEM and SEM. The results indicated that Sr 0.5 Zr 2 (PO 4 ) 3 phase transitioned from crystalline to amorphous state, while Ce 0.5 Sm 0.5 PO 4 phase exhibited crystalline–disorder transition. Furthermore, the microscopic strain changes of both post–irradiated phases were assessed by a geometric phase analysis (GPA) method, which revealed that Sr 0.5 Zr 2 (PO 4 ) 3 phase accumulated more lattice stress than Ce 0.5 Sm 0.5 PO 4 phase. Ultimately, this study confirmed that the irradiation resistance of Sr 0.5 Zr 2 (PO 4 ) 3 phase under He–ion irradiation was inferior to that of Ce 0.5 Sm 0.5 PO 4 phase.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Nian He,Dailiu Hu,Honglong Xie,Zongjin Wu,Zili Wang,E. Yang,Ruiying Cao,Hongyan Pan,Qian Lin,Zheng Chen
Despite the widespread utilization of phosphoric acid (PPA) as an activator in the preparation of biomass-derived porous carbon materials, limited research has focused on utilizing recycled phosphoric acid (RPPA) for this purpose. Here, we revealed the in situ morphological transformation of phosphorus and its influence on the mechanism of porosity development in porous carbon materials. Furthermore, we examined the pore structure distribution, morphology, surface properties of the resulting carbon materials, as well as the influence of these properties on the adsorption behavior of tetracycline hydrochloride (TC). The abundant presence of a substantial quantity of polyphosphoric acid and polyphosphates in RPPA significantly contribute to the formation of a highly mesoporous structure in AC-R, achieving a mesopore volume of up to 0.65 cm 3 /g, which is larger than that of AC-N (0.23 cm 3 /g). This displays a molecular-level strategy that can adjust pore structure by regulating the type and content of polyphosphoric acid and polyphosphate during the one-step activation process, providing theoretical guidance for regulating pore structure of porous carbon materials. Moreover, AC-R exhibited effective TC uptake of 523.63 mg/g through pore adsorption, electrostatic interaction, metal ion complexation, hydrogen bonding, and π-π stacking interactions, showing comparable adsorption performance to AC-N (520.92 mg/g).
研究领域:
材料科学
·
环境科学
·
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）