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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2013
·
IF 2.596
Quancai Li,Chunxia Li,Cheng Yang,Chenchang Liu,Guangli Yu,Huashi Guan
Three derivatives of polymannuronic acid (PM) were prepared by chemically polyanionic modification. PM was substituted with phosphate ( OPO 3 2− ), H-phosphonate ( OPO 2 H − ) and sulfate ( OSO 3 − ) groups with the degree of substitution (DS) of 0.41, 1.42 and 1.04, respectively. The structures of all PM derivatives were characterized by FT-IR, 31 P NMR and 13 C NMR spectroscopy . The weight average molecular weight (Mw) was determined by high performance gel permeation chromatography (HPGPC). The antioxidant activities of PM and its derivatives were evaluated in vitro. The results indicated that both phosphate and H-phosphonate groups improved the hydroxyl radical scavenging activity, while sulfate group enhanced the superoxide radical scavenging activity. However, all of the derivatives scavenged DPPH less effectively than PM. The mechanism for how the different anionic substituent groups influenced the antioxidant activities was discussed.
研究领域:
生物化学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 5
·1442-1456
·
IF 3.348
Ming Zhang,Luyan Wang,Xiuzhi Zhang,Xiangyun Mi,Fengmeng Sun,Mei Ding,Meishan Pei
A sodium hypophosphite (SHP) modified polycarboxylatesuperplasticizer (P-PCE) was synthesized successfully and the synthesis parameters were optimized through orthogonal experiment. Gel permeation chromatography (GPC), X-ray photoelectron spectroscopy (XPS), 31 P magic spinning nuclear magnetic resonance ( 31 P MAS NMR) spectroscopy and elemental analysis measurements were used to characterize the molecular structure of P-PCE. Effects of P-PCE on the dispersing performance of cement paste were systematically investigated via mini slump test. The results showed that P-PCE exhibited superior dispersing performance, more retarding hydration effect and better sulfate and clay tolerance than conventional PCE (C-PCE). Results showed that the maximum flow of cement paste could reach up to 305 mm, while that of the C-PCE was 285 mm.The maximum variation of adsorption of P-PCE was 9% and 15% in the presence of sulfate and clay, whereas that of C-PCE was 15% and 25%, respectively, leading to better sulfate and clay tolerance. These significant advantages could be ascribed to the high anion density and high calcium complexing capacity induced by introducingphosphinate group and phosphonate group into the molecular structure of P-PCE. The as-synthesized P-PCE can be used as a kind of high performance superplasticizer in concrete engineering.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2022
·Vol. 35
·期 1
·04022362
·
IF 3.651
Ming Zhang,Luyan Wang,Xiuzhi Zhang,Xiangyun Mi,Fengmeng Sun,Zhenzhen Fang,Meishan Pei
In this study, sodium hypophosphite (SHP) was used to modify polycarboxylate superplasticizer (P-PCE), and the properties of P-PCE on β-calcium sulfate hemihydrate (β-HH) were systematically investigated. The results showed that P-PCE could exhibit better fluidity and more retarding effect compared with the conventional polycarboxylate superplasticizer (C-PCE). The reason might be ascribed to the higher adsorption ability of P-PCE because of its stronger complexing capacity with calcium ion, which was induced by the phosphonate and phosphinate groups in the P-PCE molecule. Additionally, PCE played an important function in hindering the calcium sulfate dehydrate (DH) crystallization instead of the dissolution of β-HH, resulting in the retarding effect. This new type of PCE can show great potential in gypsum engineering.
研究领域:
建筑材料学
·
材料化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Caixia Huang,Lucheng Li,Peng Yang,Jun Chen
Although many researchers continue to pursue improved battery capacity, battery safety remains a major concern. The main cause of battery fires is the flammability of the currently available commercial organic liquid electrolytes, which are mainly composed of 1 M lithium hexafluorophosphate (LiPF6) and EC-containing carbonate solvents. Herein, a flame-retardant co-solvent tris(2,2,2-trifluoroethyl) phosphite (TTFP) was applied to improve the flame retardancy of a battery. It could improve the battery's discharging capacities at both 4.2 V and high cut-off voltage (4.5 V). Specifically, at a common voltage of 4.2 V, the cells’ 100th discharge capacity without TTFP was 130 mA h g−1 by 0.2C with a capacity retention (CR) of 69%. In comparison, under the same conditions, the capacity of the 10% TTFP-containing cell was 162.3 mA h g−1 with a CR of 73.9%. This increase in the electrochemical properties of the cell is clearly due to the addition of TTFP. When charging and discharging at 2.75–4.5 V, the capacity of the battery with STD after 100 cycles at 0.2C was 118.7 mA h g−1, and the corresponding CR was 60.93%. Meanwhile, the discharged capacity of the battery containing 10% TTFP was 150.0 mA h g−1 with a corresponding CR of 65.39%. Through combustion test with and without the TTFP electrolyte, it can be concluded that the TTFP-containing electrolyte is difficult to ignite. This result indicates that TTFP can efficiently enhance the safety performance of the battery. Thus, the incorporation of TTFP can be beneficial to improve the flame retardancy of the electrolyte. Moreover, TTFP does not affect the electrochemical stability of batteries. Thus, the present work may provide a good direction for the next generation of high-performance and high-safety lithium-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN CHEMICAL BULLETIN
·
2024
·Vol. 73
·期 9
·2725-2729
·
IF 1.7
Yang Zhihui,Wang Xiaochen,Wang Yuanrong,Yang Jinyun,Lu Haifeng
A new route for the synthesis of siloxanes containing substituents with the phosphonate and amino groups based on the catalyst-free Kabachnik—Fields reaction was developed. The synthesis was accomplished under mild conditions using 3-aminopropylsilanes, cyclic ketones, and diethyl phosphite as the starting materials to give the corresponding 1-(3-silylpropylamino)cycloalkylphosphonates in high yields.
研究领域:
有机化学
·
药物化学
·
材料化学
·
分子合成
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 25
·
IF 1.768
Xiao-Hui Liu,Fei-Jun Zhang,Hui-Na Li,Xiao-Hui Hu,Wen-Li Di,Shuang Zhao
A facile, safe, and inexpensive reducing agent, sodium hypophosphite (NaH 2 PO 2 ·H 2 O), has been successfully used to perform ambient temperature living radical polymerizations of methyl methacrylate (MMA) and styrene (St). The rapid radical polymerizations were readily obtained at 25°C, i.e., MMA reached a conversion of ca 90% after 2.5 h, and St reached a conversion of ca 80% after 40 h. The polymerizations of MMA and St exhibited excellent living/controlled nature, as evidenced by pseudo first-order kinetics of polymerization, linear evolution of molecular weights with increasing monomer conversions, and narrow molecular weight distributions. The various experimental parameters—ligand, solvent, and molar ratio of NaH 2 PO 2 ·H 2 O to CuSO 4 ·5H 2 O—were varied to improve the control of polymerization, molecular weight, and molecular weight distribution. 1 H NMR analyses and chain-extension reactions confirm the high chain-end functionality of the resultant poly(methyl methacrylate) and polystyrene. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42123.
研究领域:
高分子化学
·
聚合反应工程
·
功能高分子材料
·
可控/活性聚合
·
绿色合成方法
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Qianqian Zhang,Yaru Zhu,Min Yang,Yanru Zhang,Jialin Wang,Shanshan Liu,Ye Liu,Xin Yang,Kai Feng,Wenzuo Li
Aqueous zinc-ion batteries (AZIBs) have good application prospects in the field of large-scale energy storage. The design and synthesis of high-performance cathode materials are key to promoting the development and application of AZIBs. In this work, the combination of redox active V 4+ cation and HPO 3 2− anion provides excellent zinc-ion (de)intercalation ability. In addition, HPO 3 2− and C 2 O 4 2− anion groups collaborate to construct a stable framework with multi-dimensional zinc-ion transport channels, providing fast and robust pathway for zinc-ion transport. Carbon composites further improve electronic conductivity, shorten ion transport distance, and increase the electrochemical reaction area of Na 2 [(VO) 2 (HPO 3 ) 2 (C 2 O 4 )]·2H 2 O@C (NVPCO@C) cathode material. As a result, NVPCO@C cathode material delivers a high specific capacity over 180 mAh·g −1 at a current density of 40 mA·g −1 . Moreover, NVPCO@30%C cathode material maintains 100 % capacity after 100 cycles. Ex-situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectra confirm the electrochemical activity of V 4+ /HPO 3 2− ions and reveal the zinc-ion storage mechanism.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2018
·
IF 5.651
Guo Lin,Shixing Wang,Libo Zhang,Tu Hu,Jinhui Peng,Song Cheng,Likang Fu
A novel sorbent (HPACB) was prepared by functionalized corn bract with hypophosphorous acid and applied to selectively remove Hg 2+ from aqueous solution. The HPACB was analyzed by Fourier transform infrared spectroscopy, scanning electron microscope and X-ray photoelectron spectroscopy. The adsorption properties of HPACB for Hg 2+ were studied by batch experiments. The results showed that HPACB presented an excellent selectivity for Hg 2+ from the competitive ions solution, viz. Cu 2+ , Cd 2+ , Co 2+ , Ni 2+ and Zn 2+ . The isotherms and kinetics of adsorption process were well fitted to Langmuir and pseudo-second-order model, respectively. The results indicated that the adsorbing process was monolayer adsorption and the rate-limiting step was chemical sorption . The theoretical maximum adsorption capacity of HPACB for Hg 2+ estimated from Langmuir model was 1293.71 mg/g, which was close to the experimental results. Moreover, the adsorbent can be easily regenerated and the removal rate was still higher than 92% after three cycles. The XPS analysis indicated that the complexation between Hg 2+ and P O/P OH was the main adsorption mechanism during the adsorption process, and the ion exchange also played an important role. These results suggested that HPACB was a potential sorbent for selective removal of Hg 2+ from wastewater.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Shasha Wang,Guangyi Zhang,Ying Zhang
This study investigates the flammability challenges of organic paraffin-based phase change materials (PCMs) while addressing the inefficiency of traditional additive flame retardants. Through Atherton-Todd synthesis, we engineered a one-step reaction between octadecylamine (ODA) and diethyl phosphite under mild conditions, yielding an intrinsically flame-retardant PCM (designated OD) that synergizes exceptional flame retardancy with robust energy storage capacity, boasting a phase change enthalpy of 123.8 J/g. Due to its superior gas-phase flame-retardant effect, OD extinguishes itself within 15 s after ignition. Comparative analysis shows OD outperforms ODA with a 38.6 % reduction in peak heat release rate and an 8.4 % decrease in total heat release. Advanced pyrolysis studies uncover that OD's thermal decomposition follows a cascade of chain scission, dehydrogenation, deamination, and molecular rearrangement. This work pioneers a molecular engineering strategy for covalently integrating flame-retardant functionalities into PCM matrices while delivering critical technological advancements for deploying fire-safe PCMs in power battery thermal management systems and next-generation energy-efficient architectures.
研究领域:
材料科学
·
化学工程
·
消防安全工程
·
储能技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 4
·1800981
·
IF 3.163
Bangwei Deng,Hao Wang,Xiang Li,Yan Ding,Daming Sun,Jun Ma,Mianzhong Chen,Tao Chen,Feng Gao,Meizhen Qu,Gongchang Peng
Tris(trimethylsilyl)phosphite (TMSPi) has been reported to be an excellent electrolyte additive. However, scarce reports exist on the effect of the charge cutoff potential on the cyclic stability using high-performance LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622)–mesocarbon microbead (MCMB) full cells. Herein, a high-loading and repeatable NCM622–MCMB coin-type full cell is successfully prepared, and the role of TMSPi on such a full cell at charge cutoff potentials of 4.25 and 4.45 V is studied. Theoretical calculations and detailed analyses reveal that it is oxidized in the first charging process due to its unsaturated P—O bonds, thus forming a stable P—O—F-rich cathode electrolyte interphase and preventing severe decomposition of the electrolyte over NCM622 during long-term cycling. In addition, the P—O and Si—O bonds of TMSPi both display HF-scavenging ability. Moreover, TMSPi may react directly with the LiPF 6 -based electrolyte to form some intermediate products that can be reduced on the MCMB electrode, thereby modifying the solid electrolyte interphase and improving the stability of MCMB during lithium intercalation.
研究领域:
电化学
·
材料科学
·
能源存储
·
锂离子电池
·
界面化学
·
电极材料
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Peng Zhang,Jian-Hua Cao,Wei-Hua Liang,Yue Li,Ya-Kun Wang,Da-Yong Wu
Solid electrolytes are generated through in situ polymerization within batteries, which is one of the most promising methods for achieving solid-state lithium metal batteries with good interfacial contact, high safety, and high performance. Poly-1,3-dioxolane (PDOL), although a good in situ solidified electrolyte for lithium stability, has poor applicability in high-voltage battery systems. In order to improve the interfacial compatibility between PDOL and both the cathode and anode of high-voltage batteries. we herein design a sacrificial additive, diethyl (2,2,2-trifluoroethyl) phosphite (DETFPi), with a lower lowest unoccupied molecular orbital (LUMO) and higher highest occupied molecular orbital (HOMO) energy, through methods of calculation. After being loaded into the battery, DETFPi-DOL is in situ polymerized to form DETFPi-PDOL electrolyte. The Li||DETFPi-PDOL||Li symmetric battery operates stably for 2000 h at 0.5 mA cm–2, with an overpotential of only 16 mV. XPS analysis shows that an SEI layer with high LiF content is formed on the surface of the lithium anode after cycling, which promotes the uniform deposition of lithium ions and inhibits the growth of lithium dendrites. After 300 cycles, the NCM811||DETFPi-PDOL||Li battery exhibits a remaining capacity of 154.8 mAh g–1 (81%) within the 3.0–4.35 V range, meanwhile demonstrating excellent rate performance. Moreover, a uniform CEI layer containing pentavalent phosphorus and low LiF content is formed on the surface of the cathode after battery cycling. Finally, due to the improvement of the cathode interface, the increase of interfacial impedance of the battery after 300 cycles is reduced to half that of the PDOL battery.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 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）