JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 18
·47436
·
IF 2.188
Xiuzhen Wei,Xufeng Xu,Jiawei Wu,Cuixia Li,Jinyuan Chen,Bosheng Lv,Baoku Zhu,Hai Xiang
Thin-film nanocomposite (TFN) nanofiltration (NF) membranes with superior properties were prepared using hydrophilic SiO 2 (HGPN-SiO 2 ) nanoparticles as the inorganic modifying monomer by an interfacial polymerization (IP) process. The effects of HGPN-SiO 2 on the morphology and surface properties of the prepared NF membranes were characterized by attenuated total reflectance–Fourier transform infrared spectroscopy, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, atomic force microscopy, surface zeta potential, and static contact angle. The addition of HGPN-SiO 2 can effectively improve the permeate flux of the NF membranes. When the HGPN-SiO 2 concentration in the aqueous phase was 0.08 wt %, the permeate flux of the TFN-NF membrane was twice that of the pure NF membrane. Furthermore, the acid resistance of the TFN-NF membrane was clearly improved with the addition of HGPN-SiO 2 . Under neutral conditions, the TFN-NF membrane showed superior flux and salt rejection stability in a long-running operation. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47436.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 32
·14381-14391
·
IF 3.591
Lu Bai,Min Wang,Hongjun Yang,Zhengjun Peng,Youjing Zhao,Zhilu Li
An acid-resistant nanofiltration (NF) membrane with high permeability and rejection is of great significance. A NF membrane was prepared via interfacial polymerization with the assistance of surfactants, where three different common surfactants were used: sodium dodecyl sulfate (SDS), sodium lauryl sulfonate, and sodium dodecyl benzenesulfonate. The addition methods of SDS were optimized, with the results showing that using SDS to activate the substrate surface significantly affects the membrane performance. The surfactant was firstly deposited on a poly(ether)sulfone (PES) support layer prior to the interfacial polymerization of polyethyleneimine (PEI) and cyanuric chloride (CC) to form an active layer. The presence of SDS on the surface of the PES support membrane improves the retention of PEI in the process of the membrane preparation, thus affecting the morphology and cross-linking degree of the membrane, and ultimately affecting its performance. The NF membrane prepared under optimized conditions exhibits a water flux of 144.7 L m−2 h−1, while its rejection of MgCl2 was 92.2%, with a decline in the rejection after one-month of acid soaking tests to give a value that is lower by 1.7%. The prepared NF membrane has good water flux and rejection properties, and exhibits long-term acid resistance.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Guiying Tian,Weiyi Cai,Chuanfeng Huang,Jun Xiang,Yifang Gao,Yiming Xiao,Lei Zhang,Penggao Cheng,Jianping Zhang,Na Tang
superhydrophobic surfaces with superhigh adhesion is significant in special engineering applications, but an elaborate superhydrophobic structure is difficult at artificial fabrication. In this study, a poly[2,2′-(4,4′-oxybis(1,4-phenylene)− 5,5′-bibenzimidazoles]-polydimethylsiloxane (OPBI-PDMS) membrane is prepared via a facile vapor-induced phase separation method, which exhibits high contact angle of 154.1°, high water adhesion and high acidic resistance for 200 h. The results indicate that the sponge-like hierarchical structure formed on the sticky surface of OPBI-PDMS membrane, which offers high hydrophobic property and high adhesion in air, based on the capillary action and pinning effect. Coupled with the high acid-proof performance, the OPBI-PDMS blending membrane is successfully applied in the controllable transferring of acid droplets.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 24
·4643
·
IF 5
Lina Wang,Yue Kang,Weilu Zhang,Jiahao Yang,Haiming Li,Meihong Niu,Yanzhu Guo,Zhiwei Wang
In this work, novel lignin-based nanoparticles (LβNPs) with high acidic tolerance were successfully prepared via electrostatic interaction between β-alanine and lignin nanoparticles. The effects of the mass ratio of lignin nanoparticles to β-alanine and pH value on the morphology and particle sizes of LβNPs were investigated with the aim of obtaining the ideal nanoparticles. The optimized LβNPs were spherical in shape with an average particle size of 41.1 ± 14.5 nm and exhibited outstanding structure stability under high acidic conditions (pH < 4). Subsequently, Pickering emulsions stabilized by LβNPs were prepared using olive oil as the oil phase. Additionally, the effects of pH value, droplet size, morphology, and storage stability on Pickering emulsions were also analyzed. The emulsions displayed excellent stability, and were stable against strongly acidic conditions (pH < 4) after 30 days of storage. The study presented a promising approach to preparing lignin-based nanoparticles with high acidic tolerance (an ideal type of stabilizer to prepare emulsions), and exhibited extremely high potential application values in the fields of drug delivery, food additives, and oily wastewater treatment.Keywords:lignin nanoparticles;β-alanine;Pickering emulsions;acidic tolerance
研究领域:
材料科学
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化学工程
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Xudong Zhao,Qinghui Meng,Geng Chen,Zhihao Wu,Guangai Sun,Guobing Yu,Liusi Sheng,Hanqin Weng,Mingzhang Lin
In this work, magnetic Nb-substituted crystalline silicotitanate (mag-Nb-CST), which can be used for separation of Sr 2+ and Cs + from aqueous solution, is successfully synthesized by embedding amine-functionalized Fe 3 O 4 into the Nb-substituted crystalline silicotitanate (Nb-CST), being characterized by various techniques such as XRD, SEM, EDS, XPS, and VSM. The studies on the adsorption behaviors show that the adsorption process reaches equilibrium within about 8 h, and the maximum adsorption capacity on mag-Nb-CST is 14.38 mg g −1 at pH 11.00 for Sr 2+ , and 11.18 mg g −1 at pH 4.00 for Cs + , respectively. Besides the excellent selectivity towards Sr 2+ and Cs + over various lanthanides and actinides, the pH dependence on the adsorption capacity suggests a possibility to separate Sr 2+ and Cs + from each other by simply adjusting pH. Mag-Nb-CST is able to remove most of the Sr 2+ and Cs + at ppb level. Even in real seawater, it is able to remove 94.19% of Cs + . Moreover, mag-Nb-CST shows good acid-resistance and radiation stability. The crystal structure and morphology remained almost the same after γ-irradiation with an adsorbed dose up to 435.8 kGy. Most importantly, only less than 0.1% of Fe is leached out from mag-Nb-CST at pH > 2, indicating that the embedded Fe 3 O 4 nanoparticles are protected from corrosion by the coated Nb-CST, which is in favor of elimination of Sr 2+ and Cs + in acidic solutions. Thus, mag-Nb-CST is a promising adsorbent in the treatment of acidic radioactive liquid wastes, and the purification of contaminated seawater.
研究领域:
材料科学
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环境科学
·
核化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·
IF 3.9
Renhan Li,Gongxun Bai,Hongbin Zhang,Enhai Song,Jiasong Zhang,Denghao Li,Junjie Zhang,Shiqing Xu
As an environment-friendly powder with good coloring performance, rare earth sulfide is one kind of the important choices to replace cadmium and lead colorants. In particular, γ-Ce 2 S 3 belongs to rare earth sesquisulfide, which has a bright red color. However, the uncoated γ-Ce 2 S 3 is easy to decompose and release H 2 S in a humid or acidic environment, and its air thermal stability is limited to 350°C. In this work, γ-Ce 2 S 3 powders coated with zinc oxide were prepared by heterogeneous precipitation method, and a dense protective layer was formed by ZnO to improve chemical and thermal stability. Moreover, silicon dioxide was deposited on the surface of the zinc oxide coating using the microemulsion process to strengthen the powder's acid resistance. The double shells structure greatly promoted thermal stability and acid resistance of γ-Ce 2 S 3 powders. The results showed that rare earth sulfide powders with double shells have good stability for coloring applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Ruiyang Hou,Qianli Zhang,Wenmiao Wu,Yaping Ma,Rongya Zhang,Minchang Liu,Jian Chen,Wu Wen,Juan Zhang,Zheng Peng
Wine lees is a low value biomass resource rich in cellulose, with great potential for producing organic fertilizers and chemicals. However, the high acidity of wine lees limits the catalytic efficiency of the conversion tool endoglucanase. Here, we expressed endoglucanase tCel5A from Trichoderma reesei in Pichia pastoris, and the combination of promoter AOX1 and signal peptide SUC2 resulted in a highly active expression of 4632.81 U/mg. Subsequently, the catalytic center design and surface charge modification strategy resulted in mutants T88H/W255H and S45D/T55D/T59D exhibiting catalytic activity twice and three times higher than WT at pH 3.0, respectively. Finally, when the solid–liquid ratio was 1:15 (w/v), the degradation rate of wine lees was nearly double that of WT. The degradation products contained a variety of industrial and pharmaceutical raw components, including the antioxidant and anticonvulsant isopiperolein B. This study accelerates the green and sustainable management of wine lees.
研究领域:
生物工程
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酶学
·
可持续发展
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2023
·
IF 16.5
Shiyao Liu,Yutong Gong,Xiao Yang,Nannan Zhang,Huibin Liu,Changhai Liang,Xiao Chen
The study of the aqueous-phase selective hydrogenation of maleic anhydride to succinic acid is important for expanding the coal chemical industry chain and promoting biomass conversion . The key lies in the development of highly efficient and stable non-noble metal catalysts. Herein, we report a novel intermetallic CaNi 2 Si 2 catalyst with high activity and stability for the aqueous-phase selective hydrogenation of maleic anhydride. The results from the experiments and theoretical calculations demonstrated that the high catalytic performance was due to the synergy of the electron-rich Ni active sites, enhanced adsorption of C=C bonds, and favorable activation of H 2 . The yield of succinic acid can be 100% over the CaNi 2 Si 2 catalyst at the contact time of 5.4 g cat /(mmol reactant ·min −1 ) under 3 MPa and 120 °C in the continuous flow reactor. Furthermore, the special coordination environment and electronic structure of Ni in CaNi 2 Si 2 inhibit the formation of carboxylates, thus enhancing the acid resistance in the reaction environment. The fine design and regulation of the structure of intermetallic silicides will be important references for the controllable optimization of maleic anhydride hydrogenation catalysts and provide new insights into the development of efficient and stable selective hydrogenation catalysts in harsh reaction environments.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Jialin Wei,Zhiyuan Qiao,Dinghe Yan,Jingwen Chu,Xinyi Zheng,Dawei Ji,Changfa Xiao,Chun Wang
In this study, we deposited polyelectrolyte multilayers (PEMs) on Poly ( p -phenylene terephthamide) (PPTA) ultrafiltration (UF) substrates with strong polyelectrolytes (PEs): polystyrene sulfonic acid (PSS) and poly (diallyldimethylammonium chloride) (PDADMAC). The growth pattern of PEMs was shifted from linear to exponential by changing substrate potential, which was attributed to synergism and antagonism of dispersion of PEs on hydrophilic substrates and electrostatic interaction between PEs and substrates. Eventually, PEMs of layer-dominated and pore-dominated regimes were successfully obtained. We focused on the transition from the pore-dominated to the layer-dominated regime of PEMs. The PEMs nanofiltration (NF) membranes in this situation showed a better separation performance due to the together work of the interface and in-pore energy barriers. The retention rate of Na 2 SO 4 and MgSO 4 was 98 % and 91 %. The eosin Y retention rate was 99.9 % and only declined 2 % after 100 h. The hindered deposition of pore-dominated regimes led to denser and thinner layers, which achieved long-term acid resistance. It maintained a stable salt retention after 185 h cross-filtration of 0.1 M H 2 SO 4 feed solution. The performance of PEMs NF membrane was improved from a new perspective, and excellent acid-resistant nanofiltration membranes were obtained, which are expected to be used to treat industrial acidic wastewater.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xuyou Yang,Junhui Huang,Fan Yang,Wenguang Wang,Caihong Xue,Wanji Zhou,Yadong Wu,Lu Shao,Yanqiu Zhang
Phytate as a natural strongly charged organophosphate has recently attracted much attention in diverse fields including membrane separations towards water-energy-food nexus. However, the ideal phytate-based nanofiltration membrane with defect-free and ultrathin selective layer for highly-efficient water treatment is still much challengeable due to the typical aggregation of metal ions and uncontrolled reaction between metal ion and organophosphate via conventional coating method. Herein, metal-organophosphate biphasic interfacial coordination reaction is proposed to construct ultrathin (13.4 nm) selective layer of phytate-based nanofiltration membranes with high permeance and excellent stability by controllable coordination assembly. Iron acetylacetonate (Fe(acac) 3 ) as an organic phase monomer with powerful electron-gaining ability is exploited to avoid the aggregation of traditional Fe(III) in aqueous phase, which can also coordinate with phytic acid (PA) to ensure a defect-free ultra-thin selective layer. The architecture of the phytate-based selective layer can be well regulated by optimizing the coordination metal source, the concentration of PA and Fe(acac) 3 , reaction time, so as to achieve the ultrahigh permeation flux of 190 L m −2 h −1 with excellent dye rejection (99.6%). Most interestingly, our phytate-based nanofiltration membranes with plenty of hydrophilic phosphate groups on the surface and high binding energy of P–O–Fe bond (−315.1 kJ mol −1 ) exhibited the long-term separation stability, excellent acid-resistance and anti-pollution ability, realizing the stable membrane separation process under harsh conditions.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2022
·
IF 0
Zhao Yang,Shushan Yuan,Yimeng Shi,Yuting Zhang,Shijie Bian,Sha Liang,Keke Xiao,Wenbo Yu,Huijie Hou,Jingping Hu,Bingchuan Liu,Jiakuan Yang
Membrane fouling and acidic environment instability are inevitable problems restricting the widespread application of membranes in wastewater treatment. Herein, we report a polyelectrolyte hydrogel membrane with high acid resistance and antifouling properties synthesized by phase inversion of Kevlar nanofibers solution. The hydrogel membrane, compared to the commercial PVDF membrane, has a higher rejection of Congo Red, Direct Red 23, and Direct Red 80 solutions, and excellent antifouling performance when filtering bovine serum protein or humic acid solution. The high antifouling performance is attributed to a large number of hydrophilic groups in the structure of the hydrogel, which can induce the formation of a protective layer of hydration, thus reducing the pollutants adsorbed on the surface. Besides, the acid resistance ability of the Kevlar membrane was verified by a phosphoric acid (pH = 0) immersion experiment. Due to the superior performance of this membrane and the one-step preparation process, the developed Kevlar membrane has great potential applications for wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
FUEL
·
2022
·
IF 8.035
Zejun Zhang,Zhansheng Wang,Qingji Wang,Hua Zhang,Yuqi Tang,Qian Qu,Liwei Shen,Dong Xiang,Yuanzhu Mi,Xuemin Yan
A multi-branched trinuclear ionic liquid demulsifier (EDHBr-IL) was synthesized using glycerol triglycidyl ether, di- n -hexylamine and 1-bromododecane as raw materials using a simple “one-pot” method. Its structure was characterized by FT-IR, 1 H NMR and 13 C NMR spectra. EDHBr-IL exhibited a favorable demulsifying performance in W/O emulsions at lower temperature. The demulsifying efficiency (DE) of 300 mg/L of EDHBr-IL at 50 °C reached 90 % with for 2 h. It showed an excellent acid, alkaline and salt resistance. A relatively high DE was achieved at a pH range of 4–12 and a salinity of 10,000 mg/L. In addition, the demulsification mechanism was explored based on interfacial properties and micro examination. EDHBr-IL has substantial potential for the demulsification of W/O emulsions due to its simple and safe preparation, and performance comparable to that of with commercial demulsifiers.
研究领域:
化学工程
·
材料科学
·
胶体与表面化学
✓ 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）