CHEMOSPHERE
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2022
·
IF 8.943
Xinyu Hu,Pan Hu,Hu Yang
In this work, two series of binary graft cationic starch-based coagulants (CS-DMCs and CS-DMLs) with different hydrophobicities and charge densities (CDs) were prepared by graft copolymerization of acrylamide with 2-(methacryloyloxy)-N,N,N- trimethylethanaminium chloride and acryloyloxyethyl dimethyl benzyl ammonium chloride , respectively, on the starch (St) backbone. Kaolin particles, sodium humate (NaHA), and bovine serum albumin (BSA) were used as the simulated sources of inorganic colloidal particles and different organic pollutants in the micropolluted turbid surface water. The influences of the CD and hydrophobicity associated with the St-based coagulants on the removal of kaolin particles, NaHA, and BSA from single, binary, and ternary pollutant aqueous systems were investigated systematically. On the basis of the apparent coagulation performance, the floc characteristics, and the zeta potentials of the supernatants after coagulation, the coagulation mechanisms associated with the structural features of the St-based coagulants and the pollutants treated were explored and discussed in detail. The St-based coagulants with a higher CD and a stronger hydrophobicity showed better coagulation performance due to the synergistic effects of charge neutralization and hydrophobic association. The maximum efficiencies of the optimized St-based coagulant in removal of Kaolin, NaHA and BSA were 93.85%, 100% and 97.52% in their respective single pollutant systems. In addition to these simulated water samples, a real micropolluted turbid surface water tested and compared, further confirming the superiority of the hydrophobically modified cationic St-based coagulants, especially in the purification of organic pollutants in water.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Zhen Yang,Kexin Ren,Eric Guibal,Shuying Jia,Jiachun Shen,Xuntong Zhang,Weiben Yang
A flocculation method was used for the removal of trace nonylphenol (NP) from synthetic surface water containing natural organic matters (humic acid, HA) and suspended inorganic particles (kaolin). A polymeric flocculant (CMCND), with enhanced cationic property and unique switchable hydrophobic/hydrophilic characteristic, was specially designed for this application. CMCND showed a high efficiency for trace NP removal, turbidity and UV 254 abatements: under optimized conditions (pH: 4; T: 35 °C; dosage: 40 mg/L), the removal of NP reached up to 79%. By using dosage-pH flocculation diagrams and correlation analyses as tools, kaolin and HA were found to exert synergistic effects on NP removal, with the aid of CMCND; the synergistic effect of HA is higher due to π-π stacking. Zeta potential-dosage profiles clearly demonstrated charge neutralization predominated at pH 4, due to the strong cationic groups in the flocculant. Floc size monitoring displayed that the delayed phase transformation process (from hydrophilicity to hydrophobicity) of CMCND at 35 °C enhanced NP removal. In addition, spectral analyses clarified the interactions among CMCND, NP, kaolin and HA: charge attraction and hydrophobic interaction between CMCND and NP played the key roles. The findings are of significance for removing endocrine-disrupting chemicals in environmental remediation.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Zhangfu Yuan,Lu Mei,Shanshan Xie,Linfei Zhao,Hongxin Zhao,Bingsheng Xu
ABSTRACT Polyethylene porous filter tube membranes were prepared by powder sintering method. The micro-structure of the tubular membrane, the effect of inorganic particles, and emulsified oil on membrane fouling were studied. The membrane flux variation curves were analyzed to further reveal the fluxing mechanisms. The results showed the membrane was composed of particles with the size of 10–60 μm, and there were many irregularly shaped three-dimensional through pores with the size of 20–70 μm in its cross-section. For inorganic particle dispersion filtration, the larger the dispersion concentration was, the greater the membrane flux dropped, and the smaller the irreversible fouling was; the smaller the inorganic particle size and the higher the filtration flow rate were, the greater the membrane flux dropped and the greater the irreversible fouling were; The analysis showed that at the beginning of filtration, the membrane first underwent complete pore blocking, and as the filtration process proceeds, the contamination pattern of the membrane changed, and cake filtration blocking occurred. For emulsified oil filtration, the larger the pH value was, the smaller the zeta potential, and the smaller the emulsified oil was, the greater the decreased in membrane flux and the greater the irreversible fouling was. For the filtration of turbid ring water with inorganic particles and emulsified oil, the membrane flux decreased less than the filtration with emulsified oil only; as the concentration of emulsified oil increased, the irreversible fouling tended to rise.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
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2024
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IF 3.9
Yifan Wu,Yangguang Xia,Ye Yuan,Ziyi Dou,Chenqun Kan,Na Zhang,Taisheng Wang
The mechanochromic materials can respond to environmental changes by altering the optical properties of the system, which has garnered significant attention in recently. The utilization of these materials for the purpose of sensing tensile and compressive stress has been extensively documented. However, the mechanochromic polymer that can effectively discriminate hardness of inorganic particles is still rarely reported. In this article, a force-sensitive organic polysiloxane was developed by introducing triethenyl-substituted rhodamine derivatives crosslinker into the polymethylhydrosiloxane network through hydrosilylation addition reaction. The results demonstrated that the grinding of the crosslinked polysiloxane effectively facilitated the transmission of external force to the polymeric network, leading to an open ring isomerization of rhodamine accompanied by significant alterations in visible and fluorescent color. In addition, we found that the optical properties of the system showed distinct variations when the inorganic particles with different Moh's hardness were co-ground with the polysiloxane. High Moh's hardness particles, such as Al 2 O 3 , could effectively trigger the mechanochromic behavior of the polymer, while Na 2 SO 4 particles with low hardness failed to induce the corresponding change. Therefore, this organic polysiloxane could be used as a potential fluorescent indicator for hardness recognition. Graphical
研究领域:
材料科学
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光学材料
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化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jiangshuai Hu,Bin Ji,Rui Wang,Danting Shi,Senlin Shao
A microbe-rich cake layer (i.e., a membrane biofilm) may maintain a stable hydraulic resistance at low fluxes because the microorganisms may decompose organic foulants and create cavities in the cake layer. However, these microorganisms cannot decompose the inorganic particles, which can increase cake resistance because of the synergistic fouling effect with organic foulants. To gain a better understanding of the effect of microorganisms on the microbe-rich cake layer containing inorganic particles, we investigated the change in hydraulic resistance, structure, and composition during the transition of cake layers from a microbe-poor state to a microbe-rich state, at the flux of 5, 10, and 30 L·m −2 ·h −1 . And we used SiO 2 particles (2.5 μm in diameter) and sodium alginate to simulate inorganic particles and organic foulants. The results showed that when the cake layer was transformed from a microbe-poor state to a microbe-rich state, the hydraulic resistance was reduced, the structure became looser, and inorganic particles were partially detached. These changes were more pronounced for the cake layer under an ultra-low flux of 5 L·m −2 ·h −1 , with 62% and 47% reductions in the hydraulic resistance and inorganic particles, respectively. These results indicated that the fouling by inorganic particles could be reduced by the microorganisms at ultra-low fluxes. Cake composition analysis , forces balance analysis, and computational fluid dynamics simulation suggested that the reduced fouling could be derived from the reasons 1) the biodegradation of organic foulants could promote the detachment of inorganic particles, and 2) the microbial-induced cavities at ultra-low fluxes could reduce the synergistic fouling effect by inorganic particles and organic foulants.
研究领域:
环境工程
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微生物学
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膜技术
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产品关联
DOI
高影响因子
MACROMOLECULAR RESEARCH
·
2023
·Vol. 31
·期 6
·625-633
·
IF 2.4
Fan Zhuanzhuan,Xu Weizhong,Wang Ruofei,Wu Huaping,Liu Aiping
Hydrogel actuators have potential applications in many fields because of their multiple responsiveness to environmental stimuli. However, it is still very challenging to design a hydrogel actuator with simple preparation, fast response, and good mechanical properties. In this work, a facile and convenient method to obtain a fast responsive hydrogel actuator has been successfully developed by embedding uniform inorganic particles into Poly(N-isopropylacrylamide) hydrogel network to form an asymmetric structure. By controlling the types and contents of inorganic particles, a wide range of adjustable actuation property can be achieved. At the same time, the introduction of inorganic particles greatly increases the mechanical properties of hydrogels, which is also very important for actuation performance improvement of hydrogel actuators. The optimized hydrogel exhibits relatively fast bending deformation under thermal stimulation (60 ℃), with a bending velocity of about 13.0° s −1 within first 10 s and a bending amplitude of about 328.1° within 1 min. The hydrogel can be designed to be temperature-controlled claw actuators with programmable shapes, indicating its application prospects in encapsulating, grasping, and transporting objects in water environment. Graphical We successfully designed and manufactured hybrid hydrogels with an asymmetric structure and improved mechanical property by adding inorganic particles to the PNIPAM hydrogel. The hybrid hydrogel with optimized SiO 2 particles shows superior actuation properties due to bigger different in the swelling rates on both sides of hybrid hydrogels. The flexible and controllable deformation of the hydrogel actuator provides an inspiration for intelligent soft actuator in water environmental applications.
研究领域:
材料科学
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高分子科学
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软体机器人
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智能材料
·
驱动器
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Fei Lv,Kexin Liu,Zhuyi Wang,Jiefang Zhu,Yin Zhao,Shuai Yuan
The room and low-temperature performances of solid-state lithium batteries are crucial to expand their practical application. Polyethylene oxide (PEO) has received great attention as the most representative polymer electrolyte matrix. However, most PEO-based solid-state batteries need to operate at high temperature due to low room temperature ionic conductivity . Improving the ionic conductivity by adding plasticizers or reducing the crystallinity of PEO often compromises its mechanical strength . Here, an amorphous PEO-based composite solid-state electrolyte is obtained by ultraviolet (UV) polymerizing PEO and methacryloyloxypropyltrimethoxy silane (KH570)-modified SiO 2 which demonstrates both satisfactory mechanical performance and high ionic conductivity at room (3.37 × 10 −4 S cm −1 ) and low temperatures (1.73 × 10 −4 S cm −1 at 0 °C). In this electrolyte, the crystallinity of PEO is reduced through cross-linking, and therefore provides a fast Li + ions transfer area. Moreover, the KH570-modified SiO 2 inorganic particles promote the dissociation of lithium salts by Lewis acid centers to increase the ionic conductivity. Importantly, this kind of cross-linking networks endows the final electrolyte much higher mechanical strength than the pure PEO polymer electrolyte or PEO-inorganic filler blended systems. The solid-state LiFePO 4 /Li cell assembled with this electrolyte exhibits excellent cycling performance and high capacity at room and low temperatures.
研究领域:
材料科学
·
电化学
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电池技术
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聚合物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Lu Liu,Enling Hu,Haoyu Qiu,Qian Xu,Kun Yu,Ruiqi Xie,Fei Lu,Qi Wang,Bitao Lu,Qing Li,Guangqian Lan
Skin wound healing in dynamic environments remains challenging. Conventional gels are not ideal dressing materials for wound healing due to difficulties in completely sealing wounds and the inability to deliver drugs quickly and precisely to the injury. To tackle these issues, we propose a multifunctional silk gel that rapidly forms strong adhesions to tissue, has excellent mechanical properties, and delivers growth factors to the wound. Specifically, the presence of Ca 2+ in the silk protein leads to a solid adhesion to the wet tissue through a chelation reaction with water-trapping behavior; the integrated chitosan fabric and CaCO 3 particles ensure enhanced mechanical strength of the silk gel for better adhesion and robustness during wound repair; and the preloaded growth factor further promoted wound healing. The results showed the adhesion and tensile breaking strength were as high as 93.79 kPa and 47.20 kPa, respectively. MSCCA@CaCO 3 -aFGF could remedy the wound model in 13 days, with 99.41 % wound shrinkage without severe inflammatory responses. Due to strong adhesion properties and mechanical strength, MSCCA@CaCO 3 -aFGF can be a promising alternative to conventional sutures and tissue closure staples for wound closure and healing. Therefore, MSCCA@CaCO 3 -aFGF is expected to be a strong candidate for the next generation of adhesives.
研究领域:
生物医学工程
·
材料科学
·
组织工程
·
伤口愈合
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）