Desalination and Water Treatment
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2024
·
IF 1
Hongyuan Qin,Jiawei Huang,Xueli Zhang,Ling Yu,Yang Yu
In this study, lanthanum hydroxide adsorbent was synthesized through a simple hydrothermal method and applied for removing phosphate from water. The optimal adsorbent was obtained at the La/OH molar ratio of 4:1. The adsorbent showed rapid adsorption of phosphate within the first 4 h in which approximately 84% of the equilibrium adsorption capacity can be achieved. The phosphate uptake was highly dependent on solution pH. The better fit of the Langmuir isotherm model to experimental data indicated that the monolayer adsorption occurred and the maximum adsorption capacity of 193.9 mg/g was accomplished at pH 7.0. The presence of fluoride could significantly retard the uptake of phosphate. X-ray photoelectron spectroscopy analysis indicated that hydroxyl groups on the adsorbent surface played the most key role in the adsorption. The phosphate ions were adsorbed on the adsorbent through the formation of inner-sphere complexes.
研究领域:
环境化学
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纳米材料科学
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水污染控制
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表面化学
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吸附科学
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Chunxia Pang,Huanhuan You,Lili Liang,Zhanguo Li,Xiaoyan Lin,Yaping Zhang,Hao Zhang,Xunhai Pan,Yang Hu,Yan Chen,Xuegang Luo,Haijun Wang
Radioactive aerosols in confined spaces of workplaces are the main source of internal radiation hazards for staff. Therefore, biomass-based electret fiber materials as alternatives of petroleum-based polymers will be of great potential in capturing radioactive aerosols due to its biodegradability , renewability and electrostatic effects. Herein, a fabrication strategy of bamboo pulp-based electret fiber aerogels by corona polarization is reported grounded on p-phenylenediamine (PPD)-modified bamboo pulp fibers (BCFs) and ethyl cellulose (EC). The morphology, chemical structure , and physical properties of BCFs before and after modification, as well as the electret properties and purification performance of fiber aerogel were analyzed. The results showed that PPD can be grafted uniformly on the surface of BCFs, making the fibers transform from irregular cylindrical shape with hierarchical surface to regular cylindrical shape with smooth surface, and can improve the surface potential of the fibers, one of the considerably great electret properties, from 0.00 kV to 1.33 kV when the graft amount of PPD was 0.500 g/g. The improvement in surface potential, leading by the grafted PPD structure which is a charge-trapping site confirmed by stoichiometric calculations, enhance the electrostatic trapping effect of the fibers on radioactive aerosol particles and shorten the purification time from 26 min to 15 min. Moreover, the electret fiber aerogel with modified BCFs (named as PPD-DABCFs) has a low air resistance of 56 Pa at the flow speed of 5.3 cm·s −1 , a light base weight of 62.7 g·m −2 and a long service life. Therefore, the bamboo pulp-based electret fiber aerogel has a promising application in the field of radioactive aerogel purification.
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FOOD CHEMISTRY
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2022
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IF 9.231
Hongtu Qiu,Kexin Qu,Jong-Bang Eun,Hua Zhang
Thermal oxidation of different multi-element oleogels (DMEOs) was assessed by measuring the peroxide, p-anisidine, and total antioxidant values. Moreover, a rapid discriminant model for determining oleogel oxidation was established using an electronic nose combined with cluster analysis (CA), principal component analysis (PCA), discriminant factor analysis (DFA), and linear discriminant analysis (LDA). The oxidation degree of the oleogels was sensitive to their gelation temperature. The oleogels prepared with ethyl cellulose showed the highest oxidation value compared with those prepared with β-sitosterol and lecithin, or carnauba wax. Loading resveratrol and adding surfactants can effectively reduce the oxidation of DMEOs. During the thermal oxidation, the DMEOs were sensitive to nitrogen oxides and methane species. The accuracy rates of the discriminant analyses by CA, PCA, DFA, and LDA were 95.00%, 97.25%, 96.25%, and 100%, respectively, which were consistent with that of the American Oil Chemists' Society Official Method.
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POSTHARVEST BIOLOGY AND TECHNOLOGY
·
2022
·
IF 6.751
Ren Liu,Xuhao Zhu,Jian Wang,Chongxing Huang
Current methods of preserving fruit and vegetables are costly with accompanying health risks from preserver residue. ClO 2 gas preservatives can regulate the respiration and transpiration of fruit and vegetables, kill bacteria and fungi on their surface, and prolong their postharvest shelf life. Low concentration ClO 2 gas preservative will not cause safety problems and is a novel gas preservative. In this study, ethylcellulose (EC) was used as a shell material to encapsulate aqueous NaClO 2 to obtain EC-NaClO 2 microcapsules with core-shell structures. The microcapsules were inlaid in polyvinyl alcohol (PVA) film, and citric acid in the PVA film enters the microcapsules with water vapor, reacts with NaClO 2 and releases ClO 2 gas. Film-forming properties of the PVA/EC-NaClO 2 film-forming fluids were evaluated considering their viscosity and viscoelastic properties. The mechanical and gas barrier properties of the films were most suitable for the preparation of litchi storage bags when the microcapsule content was 6.0 wt%. Furthermore, the highest ClO 2 concentration in the storage bags was 263.22 ± 12.34 mg m −3 , which could kill etiological bacteria ( E. coli and L. monocytogenes ) and inhibit the growth of B. cinerea . The storage bags can extend the post-harvest shelf life of litchis and maintain their sensorial properties, such as color, moisture, hardness, weight, anthocyanins and pH. Therefore, our analysis indicates that the proposed PVA/EC-NaClO 2 active package films exhibit significant potential for applications in the field of fruit and vegetable postharvest storage .
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2023
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IF 6
Liu Ren,Wang Jian,Huang chongxing,Su Hongxia,Huang Haohe,Luo Wanru,An Jiejie,Zhao Hui,Xu Yangfan,Wang Shuangfei
The polymeric wall material of microcapsules has the function of encapsulation, protection, and controlled release of the active core material. In this study, sodium alginate (SA)-NaClO 2 solution was encapsulated in ethylcellulose (EC) microcapsules using an emulsion-solvent evaporation method. The EC/SA-NaClO 2 microcapsules were doped into polyvinyl alcohol (PVA) solution containing HCl, and an antimicrobial film was prepared using the solution casting method. Water vapor drives HCl into the interior of the microcapsules and reacts with NaClO 2 in the microcapsules to release ClO 2 gas to achieve antimicrobial properties. ClO 2 gas can effectively inhibit the growth and reproduction of bacteria and molds on strawberry surfaces. The antimicrobial film inhibited the growth of E. coli by 99.9% and reduced the area of B. cinerea to <10%. Storage bags prepared from antimicrobial films could extend the shelf life of strawberries and maintain their sensory characteristics such as color, hardness, and moisture.
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FOOD CHEMISTRY
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2022
·
IF 9.231
Hongtu Qiu,Kexin Qu,Hua Zhang,Jong-Bang Eun
In this study, 1 H nuclear magnetic resonance was used to track the evolution of oxidation products of different multi-element oleogels (DMEOs) during temperature-accelerated oxidative degradation. The nutritional properties of the DMEOs were also indirectly explored. Oleogels prepared using sitosterol/lecithin oleogelator showed higher nutritional properties than those prepared using carnauba wax or ethyl cellulose oleogelators. Only a small amount of primary oxidation product hydroxide, (Z,E)-conjugated dienic systems, and (E,E)-conjugated dienic systems were produced from all oleogels upon accelerated oxidation. Furthermore, no 1 H signal peaks of secondary oxidation products, such as aldehydes or ketones, were detected. However, very small amounts of primary alcohols (−CH 2 OH–), secondary alcohols (−CHOH–), and epoxides were identified. Moreover, resveratrol loading and surfactant addition effectively stabilized the internal structure and unsaturated fatty acid acyl content of the oleogels.
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CARBOHYDRATE POLYMERS
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2022
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IF 10.723
Liping Tan,Weihua Zhang,Xiaoguang Zhu,Yue Ru,Wenbo Yi,Bo Pang,Tongjun Liu
Lanthanum (La)-based nanoparticles (NPs) are promising candidates for phosphate removal owing to their inherently high affinity towards phosphate. However, significant challenges remain to be addressed before their practical deployment, especially the problems associated with their aggregation. Herein, we fabricated a high-efficient sorbent for phosphate removal through in-situ synthesizing La(OH) 3 NPs on a natural support, bacterial cellulose (BC), which is pre-modified with polyethyleneimine. The resultant La(OH) 3 NPs-immobilized BC with different La contents (BPLa-X) exhibited a highly fibrous porous structure, in which BPLa-3 was selected for further phosphate adsorption studies. BPLa-3 demonstrated a high adsorption capacity of 125.5 mg P g −1 , and high adsorption selectivity due to the large surface area and abundant exposed active adsorption sites for phosphate. Additionally, BPLa-3 also displayed high reusability and still possessed high adsorption capacity after four consecutive cycles of adsorption-desorption. Therefore, the present adsorbent is believed to be a promising candidate for practical phosphate removal.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 4
·2106176
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IF 18.808
Yurui Deng,Yuelei Pan,Zhongxin Zhang,Yangyang Fu,Lunlun Gong,Chengyuan Liu,Jiuzhong Yang,Heping Zhang,Xudong Cheng
Separators are vital parts of all lithium-ion batteries (LIBs), and they play a critical role in their thermal safety and electrochemical performance. Considering the low thermal stability and inferior electrolyte wettability of commercial polyolefin membranes, in this study, a novel thermotolerant polyimide aerogel (PIA) separator is designed. This is the first report on the use of chemically cross-linked PIA separators for LIBs. The outstanding porosity (78.35%) and electrolyte absorption (321.66%) of PIA separators contribute to the low internal resistance and outstanding electrochemical performance of LIBs, which can retain a high specific capacity of 118 mAh g −1 after 1000 cycles at a current density of 1 C. In addition, The LiFePO 4 |Li metal batteries with PIA separators are extremely stable at 90 °C (>300 cycles), and maintain stability even at 120 °C. More importantly, for pouch batteries, PIA separators result in higher thermal runaway temperatures compared with Celgard separators. In this paper, the pyrolysis mechanism and thermodynamic process of PIA separators are clarified by DFT calculations and in situ synchrotron vacuum UV photoionization mass spectrometry experiments.
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Energy & Environmental Materials
·
2021
·Vol. 6
·期 2
·e12317
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IF 15.122
Xingyi Wang,Kailin Luo,Lixin Xiong,Tengpeng Xiong,Zhendong Li,Jie Sun,Haiyong He,Chuying Ouyang,Zhe Peng
Severe lithium (Li) dendrite growth caused by the uneven overpotential deposition is a formidable challenge for high energy density Li metal batteries (LMBs). Herein, we investigate a synergetic interfacial kinetic to regulate Li deposition behavior and stabilize Li metal anode. Through constructing Li alloying matrix with a bi-functional silver (Ag)-Li 3 N blended interface, fast Li + conductivity and high Li affinity can be achieved simultaneously, resulting in both decreased Li nucleation and mass transfer-controlled overpotentials. Beyond these properties, a more important feature is demonstrated herein; that is, the inward diffusion depth of the Li adatoms inside of the Ag site can be restricted by the Li + solvation structure in a highly coordinating environment. The latter feature can ensure the durability of the operational Ag sites, thereby elongating the Li protection ability of the Ag-Li 3 N interface greatly. This work provides a deep insight into the synergetic effect of functional alloying structure and Li + solvation mediated interfacial kinetic on Li metal protection.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Weilin Huang,Zhijie Bi,Ning Zhao,Qifu Sun,Xiangxin Guo
The solid garnet battery is viewed as one of the most attractive candidates for investigating the solid-state lithium batteries with high energy density and safety. However, the crucial interfacial problems between the solid electrolytes and the electrodes severely hinder the improvement of battery performance. In this work, the reactive intermediate layers are introduced in between the garnet electrolytes and the electrodes. On the anode side, the ether-based electrolyte layer is in-situ converted into a gradient solid-electrolyte-interphase (SEI) film with the organic-rich outer layer and the inorganic-rich (LiF and Li 3 N) inner layer, leading to the conductive contact and the homogeneous potential distribution. Consequently, the modified Li symmetric cells exhibit the dendrite-free Li plating/stripping at the remarkable current density as high as 2.1 mA cm −2 at 60 °C. On the cathode side, the ionically conducting species composed of solid-phase LiF and Li 3 N is in-situ formed through the decomposition of the 1-Butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide-based ionic liquid layer, leading to the decreased interfacial resistance and enhanced Li + conduction. The resultant LiNi 0.6 Co 0.2 Mn 0.2 O 2 /Li batteries with the residual liquid-phase electrolytes at the solid-phase boundaries deliver the high discharge capacity of 162.4 mAh g −1 with the capacity retention of 87.6% after 100 cycles at 0.2C and 60 °C. This work demonstrates a useful strategy to make the ideal interfaces through the in-situ conversion reactions for construction of high-performance solid garnet batteries.
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MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 222
·期 10
·2000439
·
IF 2.527
Shikai Hu,Tao Shou,Guoqing Fu,Xiuying Zhao,Zhao Wang,Liqun Zhang
The high content and regular distribution of hard segment (HS) are necessary to achieve high-performance thermoplastic polyurethane (TPU), and the HS unit of TPU is generated from the reaction of diisocyanate and chain extender. However, the traditional chain extenders are mainly aliphatic diol that cannot provide rigid groups to improve polyurethane performances. Herein, a novel chain extender bis(hydroxyethyloxycarbonylamino)hexane (BHH) that contains two urethane groups is designed and used to construct high-performance TPU by increasing content and regular distribution of HS. BHH is synthesized using ethylene carbonate (EC) and hexamethylenediamine (HDA) via a ring-opening reaction. Subsequently, the effect of BHH on the polyurethane performances is studied with respect to a typical TPU by using polytetramethylene ether glycol (PTMG) and hexamethylene diisocyanate (HDI) as the starting materials. The amount of HDI considerably differs for each polyurethane, aiming to ensure the same total content of urethane groups. When compared with the traditional ethylene glycol-extended polyurethane, the size and distribution of the HS domains of the BHH-extended polyurethane are obviously more homogeneous, which proves BHH-extended polyurethane has better microphase separation. Furthermore, ordered hydrogen bonding, the mechanical properties, and heat-resistance performance are significantly improved, suggesting a potential method to design TPU delivering outstanding performance.
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ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Runxiao Zheng,Liming Wang,Xiaqing Wu,Panpan Song,Yanjing Wang,Haiyuan Zhang
Soluble lanthanum (La)(Ⅲ) species that have been extensively used as fertilizers in agriculture can potentially get into the human body through foods and environment. Most soluble La(Ⅲ) species can rapidly transform into insoluble La(Ⅲ) species under physiological conditions, however, their potential biological behavior and chronic toxicity are rarely investigated. In the present study, insoluble La(Ⅲ) species formed under physiological condition were identified as nanoscale or microscale particles, and their major components were found to experience biotransformation process upon contact with cells. Insoluble La(Ⅲ) species could adhere to extracellular membrane or be internalized into cells, capable of activating a nucleotide-binding domain and leucine-rich repeat protein 3 (NLRP3) inflammasome. The underlying mechanism could be ascribed to K + efflux and lysosomal rupture because these insoluble La(Ⅲ) species locating at extracellular membrane could reduce the unsaturated fatty acids of cell membrane, leading to potassium (K + ) efflux, and those internalized into cells could consume the phospholipids of lysosomal membrane, leading to lysosomal rupture. Mice daily drinking soluble La(Ⅲ) species to mimic drinking tea process for 90 days were found to present NLRP3 inflammasome activation in liver and kidney, as a result of chronic fibrosis, which is potentially correlated to insoluble La(Ⅲ) species formation.
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