COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
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IF 2.76
Hui You,Jiucun Chen,Chao Yang,Liqun Xu
In this paper, the wheat straw (WS) was modified using phytic acid (PA) to improve adsorption capacity for selective removal of methylene blue dye (MB, cationic dye). The morphology, structure and surface state of the modofied wheat straw using phytic acid (PA-WS) were characterized using scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS), respectively. The effects of pH, MB concentration, different temperatures and contact time on adsorption experiments were investigated. The maximum adsorption quantity of PA-WS for MB was up to 205.4 mg g −1 at 25 °C. Equilibrium adsorption isotherm data indicated a good fit to the Langmuir isotherm model and the adsorption kinetic was well-fitted by the pseudo-second-order model and the Elovich model. Regeneration study revealed that PA-WS can be reused effectively. These results indicated that PA-WS was a promising adsorbent for the removal of cationic dyes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Bing Tan,Huimin Zhao,Yaobin Zhang,Xie Quan,Zehao He,Wenting Zheng,Bingyu Shi
Phytic acid (PA) induced graphene macrostructures were synthesized and investigated for the sorption characteristics and mechanisms of mercury. The as-synthesized graphene foam possessed large specific surface area and amphiphilicity. FTIR and XPS analysis revealed that the as-prepared graphene macrostructure retained oxygen-containing functional groups after hydrothermal reduction and also captured new phosphorus-containing groups because of the introduction of PA. Different experimental parameters, such as pH, PA fractions and contact time were applied to probe into the Hg(II) adsorption performance of as-synthesized macrostructure. Pseudo-second-order kinetic model and Langmuir isotherm model fitted well to the obtained sorption kinetic and isothermal data. The maximum adsorption capacity at pH = 7.2 for mercury was 361.01 mg/g. The dominant mechanisms for mercury removal were mainly ion exchange and surface complexation. Real application in river water and seawater exhibited very promising results, indicating its broad prospect in water purification .
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PubMed
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 43
·7755-7761
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IF 1.915
Cong Wang,Junyong Sun,Han Mei,Feng Gao
In this work, the synthesis of carboxyl functionalized semiconducting polymer dots (PFBT-COOH Pdots) is achieved by a co-precipitation method. The PFBT-COOH Pdots show extraordinary fluorescence brightness and excellent photostability, and the fluorescence of PFBT-COOH Pdots is selectively quenched by ferric ions. Upon addition of phytic acid (PA) to the Pdots/Fe(III) system, PA is able to selectively and preferentially bind with the ferric ions, thus leading to fluorescence recovery of the PFBT-COOH Pdots. Therefore, a simple, selective and sensitive fluorescence probe for PA detection is designed based on the fluorescence quenching-recover process. This probe exhibits a good linear relationship (R = 0.9988) with a linear range from 2.5 μmol L−1 to 450 μmol L−1 and a limit of detection of 0.63 μmol L−1. The probe also shows good selectivity for PA and a good recovery ratio, and it is applied to the determination of PA in a corn grains sample with satisfactory results.
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RSC Advances
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2016
·Vol. 6
·期 98
·95469-95475
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IF 3.289
Lingli Bu,Jingdong Peng,Huanjun Peng,Shaopu Liu,Huan Xiao,Dan Liu,Ziyu Pan,Yu Chen,Fang Chen,Yan He
Chromium(VI) is proved to be highly carcinogenic and mutagenic, thus sensitive and rapid sensors for monitoring Cr(VI) are in urgent demand. In this work, a facile fluorescent assay for the sensitive and selective detection of Cr(VI) was proposed based on static quenching combined with inner filter effect (IFE) using phosphate functionalized carbon dots (PCDs) as nanoprobes. A good linear quenching was observed in the range of 1.0–400 μM with a detection limit of 0.24 μM (σ/S = 3) under the optimized conditions. The nanoprobe was employed for detecting Cr(VI) in real water samples including river water and tap water with satisfactory recovery. Moreover, with the addition of Cr(VI), the color changes of PCDs can be easily observed by the naked eye under a UV lamp. Based on this, Cr(VI) test papers were fabricated for spot quick detection of Cr(VI).
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ENVIRONMENTAL POLLUTION
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2017
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IF 5.099
Xue Liu,Jing–Wei Fu,Evandro Da Silva,Xiao–Xia Shi,Yue Cao,Bala Rathinasabapathi,Yanshan Chen,Lena Q. Ma
Arsenic (As) in soils is often adsorbed on Fe-(hydro)oxides surface, rendering them more resistant to dissolution, which is undesirable for phytoremediation of As-contaminated soils. Arsenic hyperaccumulator Pteris vittata prefers to grow in calcareous soils where available Fe and As are low. To elucidate its mechanisms of acquiring Fe and As from insoluble sources in soils, we investigated dissolution of goethite with pre-adsorbed arsenate (AsV; As-goethite) in presence of four organic ligands, including two root exudates (oxalate and phytate, dominant in P. vittata ) and two microbial siderophores (PG12-siderophore and desferrioxamine B). Their presence increased As solubilization from As-goethite from 0.03 to 0.27–5.33 mg L −1 compared to the control. The siderophore/phytate bi-ligand treatment released 7.42 mg L −1 soluble Fe, which was 1.2-fold that of the sum of siderophore and phytate, showing a synergy in promoting As-goethite dissolution. In the ligand-mineral-plant system, siderophore/phytate was most effective in releasing As and Fe from As-goethite. Moreover, the continuous plant uptake induced more As-goethite dissolution. The continued release of As and Fe significantly enhanced their plant uptake (from 0.01 to 0.43 mg plant −1 As and 2.7–14.8 mg plant −1 Fe) and plant growth (from 1.2 to 3.1 g plant −1 fw) in P. vittata . Since microbial siderophores and root exudates often coexist in soil rhizosphere, their synergy in enhancing dissolution of insoluble As-Fe minerals may play an important role in efficient phytoremediation of As-contaminated soils.
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高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 34
·6382-6387
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IF 1.915
Q. Chen,M. Li,F. Zhang,R. Li,G. Chen,S. H. Zhu,H. Wang
In this work, we describe a method for the fluorometric determination of phytic acid (PA) by using glutathione-capped silver nanoclusters (GSH@AgNCs). This method is based on the finding that ferric ions (Fe3+) can quench the fluorescence of GSH@AgNCs. PA, a kind of multiphosphate with a high density of negatively charged phosphate groups, shows a strong affinity for Fe3+ ions due to the multiple ligands. As a result, the presence of PA can prevent the quenching of the fluorescence of GSH@AgNCs by Fe3+ ions thus resulting in the turn-on fluorescence of GSH@AgNCs. The developed fluorimetric analysis method can allow the detection of PA with a detection limit of about 1.0 μM. Furthermore, this method was also successfully applied to the determination of PA in spiked corn grain samples with satisfactory recoveries in the range of 91.4–107%.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jiarong Huang,Xiao Wang,Haonan Wu,Shuping Xiao,Yong Liang,Huiwen Yu,Baiping Xu,Wenhua Xu,Lingcao Tan
Facilitating the utilization of biomass in the rubber field is a facile strategy to reduce environmental pollution and the carbon emission. Herein, biological phytic acid (PA) was served as an eco-friendly curing agent, and cuttlefish ink (CI) was acted as a photothermal trigger switch to fabricate multi-stimuli-responsive shape memory biobased epoxidized natural rubber (ENR) with mechanical robustness and recyclable ability. ENR was vulcanized by PA via the ring-opening reaction between phosphate groups of PA and epoxy group of ENR, leading to the construction of an impeccable cross-linking network and an adjustable T g gradient, which endowed the elastomers with improved mechanical properties and shape memory effect. Meanwhile, the topology rearrangement occurred at elevated temperatures relied on phosphate transesterification, leading to excellent thermo-activated recyclable ability and reconfigurable shape memory performance of the elastomers. Additionally, CI acted as reinforced filler to enhance the ENR matrix, enabling elastomers to achieve a robust tensile strength of 21.4 MPa and tensile toughness of 30.4 MJ/m 3 , which was nearly 26.8 times and 11.3 times of the neat ENR, respectively. Exhilaratingly, CI also acted as photothermal trigger switch for the response to near-infrared light and sun, which realized the remotely multistage shape memory performance, demonstrating the potential application of ENR in the field of actuators without environmental pollution.
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ECS Journal of Solid State Science and Technology
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2024
·Vol. 13
·期 5
·054001
·
IF 1.8
Changxin Dong,Xinhuan Niu,Jianghao Liu,Ni Zhan,Yida Zou,Chao He,Xinjie Li,Fu Luo,Yunhui Shi,Jiabao Cheng
For Ruthenium (Ru)-based copper (Cu) interconnects Cu film chemical mechanical polishing (CMP), it is crucial to select appropriate pH regulators in the slurry to ensure the chemical reactions and maintain the stability of the polishing chemical environment. In this study, the effects of inorganic pH regulator KOH, organic pH regulator diethanolamine (DEA), and 2-amino-2-methyl-1-propanol (AMP) on CMP and slurry properties of Cu film were compared. It was found when using AMP as a pH regulator, the Cu/Ru removal rate selectivity (RRS) can reach 598:1, the surface roughness of Cu film decreased to 0.76 nm, and the slurry can remain stable for at least 7 d. The performance order of the three pH regulators is AMP＞KOH＞DEA. Meanwhile, through experimental results and test analysis, it has been confirmed that AMP can also play a multifunctional role as a complexing agent, dispersant, and surfactant. Therefore, AMP can replace KOH as a new pH regulator in weak alkaline slurries. This result plays an important role in guiding the selection of organic pH regulators in the optimization of Cu film CMP slurry.
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CELLULOSE
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2024
·
IF 4.9
Pan Ying,Wang Wei,Zhang Dong,Lü Ting,Zhao Hongting
Transparent wood has the potential to be a sustainable alternative to glass in the building and construction industry. However, it is crucial to consider the fire hazard in building applications. In this study, we applied a green strategy to treat the wood aerogel with an intumescent flame retardant coating. The coating consisted of positively charged polyethyleneimine (PEI) and melamine, as well as negatively charged phytic acid. The treated wood aerogel demonstrated excellent flame retardancy. Subsequently, we incorporated the flame-retardant wood aerogel into epoxy resin to examine its impact on the thermal stability and fire resistance of the epoxy. The wood aerogel, with two bilayers of PEI + melamine/phytic acid, significantly enhanced the fire resistance of the epoxy. This was evident through notable reductions in peak heat release rate (42%) and total heat release (15%). By characterizing the char residue of the epoxy/wood-2 composite, we observed the formation of a continuous network within the epoxy matrix, effectively impeding the transfer of combustible gases and heat. Our work presents a simple and environmentally friendly approach to producing multifunctional transparent wood.
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POLYMER
·
2024
·
IF 4.1
Xinhao Cen,Zhilin Cao,Liming Lin,Zhengzhou Wang
In this study, a silica with mesoporous structure (SBA) was modified through an in-situ method with a bio phytate-based flame retardant (DPA) to form a SBA/DPA hybrid (SBA@DPA), and SBA@DPA was examined through TEM , FTIR, XRD and BET. The effect of SBA@DPA on the dielectric performance and fire behavior of a copolymer of cyanate ester resin and epoxy resin (EPCE) was investigated. The EPCE composite containing 15 wt% SBA@DPA (EPCE/15SBA@DPA) exhibited a limiting oxygen index value of 30.4 vol% with a UL-94 V-0 rating. In comparison with EPCE, EPCE/15SBA@DPA showed reductions of 12.5 % in total smoke release, 18.0 % in peak heat release rate and 23.5 % in total heat release. Moreover, EPCE/15SBA@DPA displayed a low dielectric constant (3.52) and low dielectric loss (0.00951) at 10 MHz. Mechanical properties of EPCE composites were also examined.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Yongcai Wu,Yan Chai,Liqian Yu,Wensheng Gao,Yongxiao Bai
Eco-friendly flame-retardant fabrics have recently been widely concerned and developed due to highly flammable characteristics of fabrics and environmental protection issues. Phytic acid (PA) was optimized as a common flame-retardant relying on its environmentally friendly and flame retardant characteristics. However, the strong acidity of PA always results in the loss in mechanical properties of the fabric. Herein, a synergetic strategy by compositing PA and ethanolamine (ETA) was proposed to enhance the flame resistance of the PA6 fabric. As a result, after the flame-retardant coatings prepared by the synergy of PA and ETA are impregnated on the surface of PA6 fabric, the limiting oxygen index (LOI) of PA6 fabrics increased from 21.2 % to 30.4 % with on a well mechanical strength retention rate (MSR) (more than 75 %), which is much better than the PA6 fabric treated by pure PA (LOI: 25.3 %, MSR: less than 40 %). The analysis results indicate that ETA not only reduces the damage of PA to PA6 fabrics but also plays an important role as a carbon and nitrogen source in the intumescent flame-retardant mechanism. This synergistic strategy provides a new reference for the development of environmentally friendly flame-retardant coatings.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Wentao Zhong,Pengwu Xu,Deyu Niu,Qian Wang,Weijun Yang,Xu Zhang,Tianxi Liu,Piming Ma
Flammability, slow nucleation rates, and poor UV-shielding limit the widespread use of the bioplastic polylactic acid (PLA). Traditional functional additives usually have the disadvantages of complicated synthesis process, environmental unfriendliness, single function, etc., and after blending with PLA, it will also lead to the degradation of mechanical properties. In this work, fully biobased multifunctional additives (PN) were prepared by a simple and green aqueous phase electrostatic self-assembly method using biobased phytic acid and nicotinamide as monomers. Incorporation of only 2 wt % PN endowed PLA with the limiting oxygen index of 29.0% and the UL-94 rating of V-0, meeting the standard for flame-retardant materials. Flame-retardant mechanisms of PLA/PN composites were mainly gas phase. In addition, the UV protection factor value of PLA was increased to 90.8, showing good UV shielding ability. It was noteworthy that the incorporation of PN increased the nucleation density of PLA, thus maintaining better mechanical properties of PLA. Therefore, this work provides a green and efficient method for the large-scale preparation of fully biobased multifunctional additives, which is expected to expand the application areas of PLA.
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