NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 42
·19726-19736
·
IF 3.3
Xingxin Xu,Hualiang Huang
In this work, Ca(H2PO4)2 was used as a green corrosion inhibitor for AZ91D magnesium alloy in 3.5 wt% NaCl solution. The corrosion inhibition behavior and mechanism were analyzed using electrochemical tests, high-definition video measuring microscopy, scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD). The electrochemical testing results showed that the optimal corrosion inhibition concentration of Ca(H2PO4)2 was 0.6 g L−1, and the highest corrosion inhibition efficiency was 89.29% after 48 h immersion in the corrosive medium. Optical microscopy and SEM images showed that an obvious protective film formed on the Mg alloy surface in solution inhibited with Ca(H2PO4)2. EDS and XRD results showed that the protective layer was composed of Mg(OH)2 + MgHPO4 + Ca3PO4, and MgHPO4 played a major role. The precipitation mechanism of Ca(H2PO4)2 as a corrosion inhibitor was proposed.
研究领域:
材料科学
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电化学
·
腐蚀与防护
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Yan Su,Dan Zhang,Peng Jia,Weichen Gao,Youbing Li,Zhuyu Bai,Xin Liu,Qunying Deng,Jing Xu,Chaolong Yang
Developing novel rare-earth complexes to rapidly and reliably sensing anions in pure water is highly challenging. Here, a series of long fluorescence lifetime polyurethane foam bonded Tb(BAA) 3 chromophore porous material (Tb-PUFs) have been designed and synthesized via a simple one-step co -polycondensation reaction as an efficient fluorescent sensor for H 2 PO 4 − in pure water. All Tb-PUFs exhibited strong green emission and long fluorescence lifetime in water, which was ascribed to Tb-complex can be dispersed very well in polyurethane foam, effectively avoiding the emission quenching of Tb 3+ ions caused by water molecules vibration. The titration experimental results showed that precursor Tb(BAA) 3 can effective recognize F − , CH 3 COO − , and H 2 PO 4 − in DMSO solution. Interestingly, Tb-PUFs can only selectively recognize H 2 PO 4 − in pure water, this phenomenon can be explained that H 2 PO 4 − is acidic, and can occur deprotonation with -NH group of ligand BAA , thus making the fluorescence quenching effect was more sensitive for H 2 PO 4 − in pure water. In addition, the sensing ability of Tb-PUFs for H 2 PO 4 − is highly reversible by washing them with deionized water for three times. In a word, all results implied that Tb-PUFs was an excellent candidate for H 2 PO 4 − ions detection selectively in pure water.
研究领域:
分析化学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 13
·50099
·
IF 2.52
Dan Zhang,Dehai Meng,Zhongying Ma,Zhihao Zhang,Haozhe Ning,Yuhua Wang
To optimize the poor thermal stability and flammable of polyvinyl alcohol (PVA), a novel environmental-friendly organic–inorganic hybrid flame retardant Ca(H 2 PO 4 ) 2 @HCCP was successfully designed and synthesized via surface treatment technology and used to advance the flame retardancy of PVA. The thermogravimetric analysis implied that Ca(H 2 PO 4 ) 2 @HCCP can enhance significantly the thermal stability and char forming ability of PVA. Combustion results demonstrate that Ca(H 2 PO 4 ) 2 @HCCP could effectively suppress the melt dripping of PVA in the process of combustion. The presence of Ca(H 2 PO 4 ) 2 @HCCP can sharply reduce peak heat release rate and the total heat release up to 75% and 22.9%, respectively, in the microscale combustion calorimeter measurement. The results manifested that Ca(H 2 PO 4 ) 2 @HCCP could endow PVA with superior flame retardancy. Moreover, char residues analysis explained the flame retardant mechanism in condensed and gas phase, which is mainly attributed to the strong catalytic char formation, free radical trapping, and gas barrier effect. Therefore, the green flame retardant has great application s prospect in fire safety.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Wenting Chen,Hua Liang,Xin Wen,Zongchen Li,Hui Xiong,Qiang Tian,Minhao Yan,Yuanzhi Tan,Guy Royal
To explore the effect of sensor structure on anions detection, three new hydrazones P-CN , P-CF 3 and P-NO 2 having different electron-withdraw groups are synthesized. Their anions recognition properties are investigated compared with those of P-OMe , P-H and acylhydrazone B-NO 2 . It shows all non-nitro hydrazones exhibit increasing sensitivity specifically toward CN − in the order of P-OMe < P-H < P-CN < P-CF 3 , indicated by color change from colorless to different shades of blue. Whereas P-NO 2 responds to CN − , F − and H 2 PO 4 − concurrently and its sensitivity to CN − is more than 4 times higher compared with that of the other hydrazones. CN − can be discriminated from F − by P-NO 2 in acetonitrile/water. On the other hand, B-NO 2 has only discernible response to CN − and F − with less sensitivity than P-NO 2 does. Detection details of P-NO 2 to CN − are investigated by titration, anti-interference tests, Job’s plot, HRMS, pH effect assays. The 1 H NMR, IR and reversibility tests demonstrate the deprotonation mechanism. The detection mechanisms of P-NO 2 and B-NO 2 to CN − are compared and demonstrate the reason of their recognition difference. The detection limits of P-NO 2 to CN − , F − and H 2 PO 4 − in acetonitrile are 0.0477 μM, 0.0876 μM and 1.46 μM, respectively. Hence, this work indicates that strong electron-withdraw group in related probes can improve their anion detection ability, meanwhile conjugation effect should be also considered in structure designing.
研究领域:
分析化学
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材料科学
·
化学传感器
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DOI
高影响因子
Sustainability
·
2021
·Vol. 13
·期 1
·434
·
IF 3.251
Kunlun Wang,Qian Hu,Yumin Wei,Hui Yin,Changhong Sun,Guizhong Liu
The emergent plants may differ in their capacity to assimilate nutrients from eutrophic water bodies, so the utilization of suitable emergent plants is the key part for successful restoration of shallow eutrophic lakes and rivers. This research applied the depletion method to study the kinetics of uptake of nutrient (H2PO4−,NH4+,NO3−) in different nutrient stresses by the five emergent aquatic plants (Acorus calamusL.,Typha orientalis, Lythrum salicariaL.,Sagittaria trifoliaL.,Alisma plantago-aquaticaLinn) in the riverine zones of Dashi River (39°30′–39°40′ N, 115°59′–116°5′ E), a shallow eutrophic river located in Fangshan District, Beijing. The results showed that at the three phosphorus levels,A. calamusandA. plantago-aquaticahad the highest maximum uptake rate values forNH4+under low to moderate phosphorus conditions, and high phosphorus, respectively.T. orientalishad the highest maximum uptake rate values forNO3−at all phosphorus concentrations, while the Michaelis-Menten constant values ofL. salicariaandA. plantago-aquaticawere smaller. At the three nitrogen levels, the maximum uptake rate values forH2PO4−were the greatest forA. plantago-aquaticaat the low to moderate nitrogen levels andL. salicariaat high levels. Meanwhile,T. orientalisandL. salicariahad the smallest Michaelis-Menten constant values. In this study, nitrogen microbial transformations, such as nitrification, denitrification and their coupling were not measured and their role in measuring kinetics was not assessed. Thus, achieved results shall be considered as a synthesis of several processes mediated by plants, a theoretical guidance to the selection of plant species for phytoremediation of polluted water bodies with different nutrient stresses for quality improvement around the diverse rivers in Haihe River basin.Keywords:emergent plants;eutrophication;nitrogen;phosphorus;uptake kinetics;stress
研究领域:
生态学
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环境科学
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产品关联
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2019
·Vol. 72
·期 7
·533-541
·
IF 1.226
Sai Huang,Mei Yang,Xin-Yu Deng,Qian Jiang Zhu,Ying Huang,Zhu Tao,Kai Chen
In the present work, a host–guest system of a hemimethyl-substituted cucurbit[6]uril derived from 3α-methyl-glycoluril (HMeQ[6]) and a hemicyanine dye, trans-4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide (t-DSMI) showing strong fluorescence emission has been evaluated as a fluorescent probe. The results of a preliminary systematic study on the detection of a series of inorganic anions have revealed that this Q[n]-based host–guest fluorescent probe shows clear responses to BF4− and H2PO4− anions through distinct fluorescence quenching. Application of this Q[n]-based host–guest interaction system in anion recognition or detection opens a new avenue in Q[n] chemistry.
研究领域:
化学
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2021
·
IF 6.186
Youjian Zhu,Yun Liu,Liang Wang,Wei Yang,Haiping Yang,Long Jiang,Zhenyi Du,Jingai Shao,Hanping Chen
Combustion of agricultural residues for heat and electricity production is an efficient way to reduce amount of such waste source and emissions due to inappropriate treatment of them. However, unlike other biomass materials, agricultural residues often have high content of ash and certain ash forming elements with low meting temperatures, resulting in sintering and slagging during combustion processes . It complicates combustion of agricultural residues and restricts further utilization of this renewable energy source . In this work, sintering of a typical agricultural biomass cornstalk and effect of two phosphate additives, Ca(H 2 PO 4 ) 2 ·H 2 O and NH 4 H 2 PO 4 , were investigated by a combination of various techniques. Results indicated that the addition of Ca(H 2 PO 4 ) 2 ·H 2 O increased the initial melting temperature of cornstalk ash by 64–209 °C. The ash sintering behavior was greatly improved as a result of formation of high melting temperature K–Ca phosphates, Ca 9 MgK(PO 4 ) 7 and Ca 2 KP 3 O 10 upon addition of the Ca(H 2 PO 4 ) 2 ·H 2 O. It is accompanied with reduced generation of low melting temperature K-rich silicates and the formation of large ash aggregates. Addition of NH 4 H 2 PO 4 increased the initial ash melting temperature by 28–116 °C, but it had slight influence on the cornstalk ash sintering characteristics. The analysis revealed that, although the addition of NH 4 H 2 PO 4 resulted in the formation of high melting temperature K 2 CaP 2 O 7 , certain amount of K phosphates and silicates eutectics were still formed, initiating and promoting sintering of ash from mixture of cornstalk and NH 4 H 2 PO 4 . Reactions between Ca(H 2 PO 4 ) 2 ·H 2 O and potassium salts under different conditions were also studied. It was found that reactions between Ca(H 2 PO 4 ) 2 ·H 2 O and potassium salts might already start as the temperature higher than 300 °C. K 2 CaP 2 O 7 , Ca 2 P 2 O 7 , Ca(PO 3 ) 2 and KCa(PO 3 ) 3 were identified as main products from these reactions and amounts of them considerably depends on the heat treatment temperatures and mixing ratios between Ca(H 2 PO 4 ) 2 ·H 2 O and potassium salts. Compared to KCl, K 2 CO 3 had a higher reactivity toward the Ca(H 2 PO 4 ) 2 ·H 2 O under same study conditions. The current work shows the addition of Ca(H 2 PO 4 ) 2 ·H 2 O is a promising approach to alleviate the ash sintering issues and assure efficient and smooth combustion of cornstalk.
研究领域:
能源与环境科学
·
生物质能研究
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DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Li Congshu,Liu Lixia,Pan Weitong,Chen Yanmei,Shang Xuefang,Wang Yingling,Wang Tianyun,Xu Xiufang
A series of potential chiral compounds containing an α,β-unsaturated ketone was developed for anion detection. The interplay of compounds and biological momentous anions (Cl − , H 2 PO 4 − , I − , AcO − , HS − , F − , and Br − ) was evaluated by UV-vis experiments, fluorescence experiments, and electrochemical tests. By comparison, compound 1 had the best selectivity and compound 5 had the strongest binding ability among the five compounds. And compound 5 had the highest sensitivity to H 2 PO 4 − among the measured anions, and it also can be applied to actual samples, the content of H 2 PO 4 − tested in the potassium dihydrogen phosphate fertilizer solution reached above 97.5% of the marked content, and the recovery rates were within the range of 98.5–99.1%, attesting that this method was reliable for the test of H 2 PO 4 − in fertilizer. Through HRMS titration, circular dichroism and optical rotation experiments, the probable interacted mechanism was proved that the interaction site was the C=C of the α,β-unsaturated ketone structure. In addition, the interacted mechanism was researched from the perspective of chirality. Furthermore, theoretical investigation analysis was introduced to reveal that the roles of molecular frontier orbitals in molecular interplay were determined. Therefore, this series of potential chiral compounds has potential application prospects in anion recognition.
研究领域:
分析化学
·
分子生物学
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Yan-Yan Chen,Qi Lin,You-Ming Zhang,Hong Yao,Tai-Bao Wei,Yan-Qing Fan,Xiao-Wen Guan,Guan-Fei Gong,Qi Zhou
Recently, ultrasensitive detection and multi-guest sensing have received extensive attention due to their high sensitivity and efficiency. Herein, we report a novel approach to achieve ultrasensitive detection of multi-analyte. This approach is concluded as “rationally introduce Aggregation-Induced Emission (AIE) into chemosensor”. According to this approach, by rationally introducing self-assembly moiety, the obtained chemosensor DNS could serve as a novel AIEgen and show strong AIE in DMSO/H 2 O (water fraction 80%) binary solution. Interestingly, a simple fluorescent sensor array based on the DNS has been developed. This sensor array could selectively sense Fe 3+ , Al 3+ , H 2 PO 4 − and L-Arg in water solution. More importantly, this sensor array shows ultrasensitive detection for Fe 3+ , Al 3+ and L-Arg. The LODs of the sensor array for Fe 3+ , Al 3+ and L-Arg are in the range of 3.54 × 10 −9 M to 9.42 × 10 −9 M. Moreover, H 2 PO 4 − could realize the reversible detection of Fe 3+ in the DMSO/H 2 O (water fraction 80%) solution. Meanwhile, DNS -based test papers and thin films were prepared, which could serve as test kits for convenient detection Fe 3+ , Al 3+ , and L-Arg in water. In addition, they could also act as efficient erasable fluorescent display materials.
研究领域:
分析化学
·
材料科学
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DOI
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2025
·
IF 7.1
Anxiang Huang,Zhu Liu,Shoulu Yang,Lu Xiang,Shasha Wang,Zhongwei Wang,Nengying Wu
This study explored the application of biochar produced from the forestry residues Camellia oleifera (C. oleifera) shell (COS), chestnut shell (CNS), bamboo shoot shell (BBS), and walnut shell (WNS) to elucidate the dominant mechanism by which the combined effects of different lignocellulose structures and pyrolysis temperatures regulate the adsorption of H 2 PO 4 – by biochar. The forestry waste was carbonized at different pyrolysis temperatures to obtain biochars, after which the biochar properties, H 2 PO 4 – adsorption behavior, and underlying mechanisms were investigated. The results revealed that pyrolysis temperature was a key factor in enhancing the adsorption capacity of biochar for H 2 PO 4 – , as it promotes microporosity and expands the formation of specific surface area (S BET ), micropore surface Area (S t-plot ), and pore volume (V BJH ), which in turn provides more active sites for adsorption. The adsorption experiments revealed that CNS has the best adsorption capacity for H 2 PO 4 – (Q m = 117 mg∙g –1 ) because of its unique radioactive needle-like fiber bundle structure, which forms a rich pore structure at 800°C. Quantitative contributions analysis revealed that functional group complexation (Q com ) constituted the dominant adsorption mechanism, with contributing 48 – 64%, as evidenced by a computed free energy of – 135.48 kcal·mol⁻¹. In addtion, the adsorption of H₂PO₄⁻ by FWB CNS exhibits good reusability and anti-interference capabilities. These findings demonstrate that CNS biochar has a great potential for removing phosphate from water.
研究领域:
环境科学
·
水处理
·
吸附技术
·
生物炭应用
·
污染物去除
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产品关联
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Xinru Mu,Ganyu Zhu,Xu Li,Shaopeng Li,Xiaokang Gong,Huiquan Li,Guoxin Sun
Wet-process phosphoric acid is a fundamental process in the fertilizer industry. The influence of impurities on crystallization kinetics of CaSO4 was investigated in the Ca(H2PO4)2–H2SO4–H3PO4–H2O system using a mixed suspension mixed product removal crystallizer. Effects of Si, Al, Fe, Mg, K, and Na on crystal morphology and structure were examined in the highly acidic system through scanning electron microscopy and high-resolution transmission electron microscopy. Results show that the increase of Mg, K, and Na content facilitates crystal growth. Si, Al, and Fe are beneficial to CaSO4 crystal growth at a certain concentration range. Impurities also affect the crystal morphology, and the addition of Si, Fe, and Na promotes the formation of needle-like crystals compared with other impurities. X-ray diffraction results show that the preferred crystal growth direction is (020), and the interplanar spacing of the crystals is affected by the element radius of the impurities.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Duanliang Wang,Xiangsheng Meng,Nana Zhang,Defu Sun,Ruoxian Hou,Hanzhang Chen,Xiaobing Liu
A novel organic-inorganic hybrid crystal, (C 5 H 12 NO)H 2 PO 4 (4-(Hpd)H 2 PO 4 ), has been synthesized by evaporation method under ambient atmosphere. Based on structure analysis, the compound crystalizes in the polar space group P2 1 with the parameters a = 8.6074 (6) Å, b = 6.3134 (4) Å and c = 9.0934 (7) Å. By the hydrogen bonds , 4-(Hpd) + cation and (H 2 PO 4 ) - anion were aligned to form an alternatively intercalated three-dimensional framework. Physical properties including thermal performance, linear and nonlinear optical characteristics were identified. On the basis of the results, a high and broad transmittance has been exhibited at the ultraviolet region and the optical band gaps is proved about 3.71 eV for 4-(Hpd)H 2 PO 4 crystal. PL presented an obvious emission peak with the position at 450 nm. SHG response has been demonstrated and the intensity is about 0.15 time that of KDP. In particular, First-principle density functional theory (DFT) calculation was performed to get insight into the correlations between optical properties and electronic structure. The results reveal that the interactions of 4-(Hpd) + cations and (H 2 PO 4 ) - anions are associated with the high transmittance and SHG.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）