SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yongze Li,Yazhou Tang,Yuchen Yang,Wenxiang Zhou,Chujie Qi,Kai Zhou,Bo Bian
Existing cyanobacteria thickening and dewatering processes in Taihu Lake commonly use conventional inorganic flocculants to condition the cyanobacteria, which poses certain environmental risks. In this study, three different types of typical flocculants, namely polymerized aluminum chloride (PAC), cationic polyacrylamide (CPAM) and starch-based flocculant (St-CTA), were selected to investigate their flocculant effects on cyanobacteria and the mechanism of action. The analysis showed that the dosage of St-CTA was low, the flocculation efficiency was high, and it could form flocs with large particle size and high strength. The adsorption and precipitation effect of St-CTA on protein and polysaccharide in flocculated EPS was stronger than that of CPAM and PAC, and it was able to act on the protein structure of EPS favorable for flocculation, improve the hydrophilic effect of S-EPS and LB-EPS, and reduce the content of bound water in EPS from 2.08 to 1.22 g/g DS, thus improving the efficiency of algae-water separation. The free energy and energy barrier of the EPS surface in each layer of the cyanobacterial floc after flocculation by St-CTA were significantly reduced, which resulted in the tendency of the cyanobacterial particles to aggregate and thus flocculate and settle. The pilot validation of St-CTA for cyanobacteria dewatering showed that the water content of algal residue could be reduced to 93.48 %, and the removal efficiencies of total nitrogen (TN), total phosphorus (TP), ammoniacal nitrogen (NH 3 -N), and chemical oxygen demand (COD) in the air-floated water could be up to 27.3 %, 76.6 %, 27.4 %, and 56.4 %, respectively. In conclusion, this study provides scientific knowledge and demonstration for promoting the use of St-CTA to condition cyanobacterial thickening and dewatering, which is a new idea to solve the problem of cyanobacterial resourcefulness and safe utilization.
研究领域:
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Linhan Mao,Hong Chen,Yue Lian,Yan Cao,Xilin Wang,Zhaoxia Chen,Yuhong Zhang
The rapid expansion of the petroleum industry has led to a surge in oil spill incidents, the development of novel superhydrophobic absorbents for the efficient removal of oil spills has become increasingly imperative. In this study, a novel starch-based superhydrophobic composite absorbent was fabricated through a two-step process. Initially, potato starch was gelatinized and then freeze-dried to form a porous starch cryogel (SC). Subsequently, the SC was impregnated with carnauba wax (CW)/polydimethylsiloxane (PDMS) composite solution. After curing, the P-CW@SC with exceptional superhydrophobicity (contact angle = 154.0°) and superoleophilicity was developed. Furthermore, P-CW@SC exhibited excellent self-cleaning properties, anti-fouling efficacy, mechanical strength and chemical stability. Owing to its well-developed porosity, P-CW@SC demonstrated good oil absorption capacities (4.79–13.05 g/g). The selective hydrophobicity and lipophilicity of P-CW@SC enabled effective remediation of underwater oil spills and it could achieve oil-water separation efficiencies exceeding 95.59 % under dynamic conditions after 10 cycles. Upon 50 d of degradation testing in buffer solution, the weight loss rate of P-CW@SC weight reached 43.5 %. Considering its cost-effective raw material composition and simple preparation process, P-CW@SC holds significant potential application in the treatment of oily wastewater and oil spill remediation.
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Food Packaging and Shelf Life
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2025
·
IF 10.6
Youning Zou,Jiahao Ren,Yiting Fan,Yifang Cao,Yijia Xie,Xinglong Xiao,Fengsong Liu
The development of sustainable food packaging materials remains a critical challenge due to inherent limitations in hydrophobicity, antioxidant activity, and antimicrobial efficacy. Herein, a novel starch-based film incorporating pullulan and geraniol was designed to overcome these shortcomings through hydrogen bonding and intermolecular entanglement. Structural analyses using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) confirmed strong molecular interactions, while scanning electron microscopy (SEM) and light transmittance studies demonstrated enhanced compatibility and improved optical properties. Notably, the Starch-Pullulan-Geraniol film exhibited superior hydrophobicity, with a contact angle of 68.11°, reduced water solubility (37.56 %), and minimal water vapor permeability (1.35 ×10⁻ 10 g·m⁻ 1 ·s⁻ 1 ·Pa⁻ 1 ). Mechanical performance was also enhanced, achieving a reduced Young’s modulus of 130.34 MPa, a tensile strength of 22.66 MPa, and a maximum elongation at break of 52.81 %. Furthermore, the incorporation of pullulan and geraniol conferred remarkable antimicrobial and antioxidant properties, significantly improving the film’s effectiveness in food preservation. When applied to salmon storage, the film successfully maintained appearance, lipid stability, and microbial safety, highlighting its potential as an advanced bio-based packaging material. These findings underscore the Starch-Pullulan-Geraniol film as a promising alternative to conventional packaging, offering enhanced functionality for extending food shelf life.
研究领域:
食品科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Peng Liu,Cong Ma,Ying Li,Liming Wang,Linjie Wei,Yinlei Yan,Fengwei Xie
This work demonstrates a facile and “green” method to prepare eco-friendly, flexible, transparent, and ionically conductive starch-based materials, which have great potential for personal health-monitoring applications such as disposable electrodes. This method relies on the use of the CaCl2 solution and enables both the efficient disorganization and amorphization of high-amylose starch granules with low energy consumption and the reinforcement of the starch chain network by starch–metal cation complexation. Specifically, the method involves a simple mixing of a high-amylose starch with the CaCl2 solution followed by heating the mixture at 80 °C for 5 min. The whole process is completely environmentally benign, without any waste liquid or bioproducts generated. These resulting materials displayed tunable mechanical strength (500–1300 kPa), elongation at break (15–32%), Young’s modulus (4–9 MPa), toughness (0.05–0.26 MJ/m3), and suitable electrical resistivity (3.7–9.2 Ω·m). Moreover, the developed materials were responsive to external stimuli such as strain and liquids, satisfying the requirements for wearable sensor applications. Besides, composed of only starch, CaCl2, and water, the materials are much cheaper and eco-friendly (can be consumed by fish) compared with other polymer-based conductive hydrogels.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xuefeng Xiao,Yongjun Sun,Jianwen Liu,Huaili Zheng
Two bioflocculants of starch-graft-P[acrylamide-acrylic acid] (SAA) and starch-graft-P[acrylamide-2-acacrylamido-2-methyl-1-propanesulfonic acid] (SAS) are designed for the flocculation–chelation of heavy metals. The successful polymer synthesis is confirmed through physicochemical characterization. SAA and SAS are used to remove Cu(II), Zn(II), and Ni(II) from simulated wastewater and Ni(II) from actual electroplating wastewater. The removal efficiencies for Cu(II), Zn(II), and Ni(II) in the simulated wastewater by SAA and SAS are more than 80.00%, whereas those for Ni(II) are more than 90.0% in the Ni-containing electroplating wastewater at the optimal condition. Flocculation experiments reveal that the sulfonate structure of SAS is highly conducive to improve flocculation efficiency. SAA and SAS have high selectivities for Cu(II) in the simulated water sample with mixed heavy metal. Finally, the 3E (i.e., environmental impact, economic benefit, and energy consumption) triangular evaluation model is established to evaluate the flocculation experiments for the removal of heavy metal ions using SAA and SAS.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Food Packaging and Shelf Life
·
2025
·
IF 10.6
Xiaoyu Xu,Kangqi Huang,Danfeng He,Bin Huang,Qun Tang,Heping Li,Zhiming Zou
Colorimetric ammonia-sensing smart packaging materials that enables real-time visual detection of food freshness play an important role in ensuring food safety. This work involved the construction of a novel Cu/Na-metal organic framework (CuNa-MOF) colorimetric ammonia sensing agent and its subsequent exploitation as functional reinforcing filler of potato starch (PS) substrate to boost the fabrication of high-performance smart packaging materials. Based on single crystal data analysis, a new mechanism of crystal-to-crystal phase transformation was proposed for the colorimetric ammonia-sensing action of CuNa-MOF. This new mechanism involved only minor changes in CuNa-MOF crystal structure (with the coordinated water replaced by ammonia), indicating its unique structural integrity and stability, thus contributing to superior ammonia sensing ability. The results also demonstrated that the introduction of CuNa-MOF (2–6 wt%) within PS substrate resulted in the formation of compatible and tight nanocomposite films. When the content of CuNa-MOF increased from 0 to 6 wt%, the tensile strength, water vapor barrier, and oxygen barrier capability was respectively increased by 11.6 %, 16.4 %, and 18.2 %, and the UV-shielding efficacy was increased from 36.8 % to 96.1 %. Furthermore, the fabricated PS/CuNa-MOF film presented good biocompatibility and long-term colour stability, while combining remarkable colour-changing ammonia sensing function with high antibacterial efficiency (100 %) against Escherichia coli and Staphylococcus aureus . Additionally, the PS/CuNa-MOF film allowed for real-time visual monitoring of prawn freshness decay by discernible coloration changes. This work offers a new strategy in the design of high-performance colorimetric ammonia-sensing materials for smart packaging application.
研究领域:
材料科学
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食品安全
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Pan Hu,Jie Ren,Xinyu Hu,Hu Yang
Two laboratory-made cationic starch-based flocculants (St-CTA and St-AD) with different chain architectures were used to simultaneously remove phosphorus and turbidity from two simulated wastewaters and one actual wastewater with laboratory and pilot scales, respectively, in conjunction with FeCl 3 . A commercial polyacrylamide (PAM) has been also tried and compared with aforementioned starch-based flocculants. The removal extents of phosphorus and turbidity increased, the required dosages of FeCl 3 decreased, and floc properties improved after dosing each polymeric flocculant after FeCl 3 in all tested wastewaters due to their synergistic effects. However, the three flocculants exhibited different improvement efficiencies on the treated wastewaters containing different forms of phosphorus and showed various synergistic mechanisms owing to their distinct structural features. In inorganic–phosphorus-simulated wastewater, the linear nonionic PAM with a high molecular weight had a more notable contribution than the two starch-based flocculants due to its efficient bridging flocculation effect. Given the branched-chain structure and high positive charge density of St-AD, it had a higher efficiency in treating real wastewater and organic–phosphorus-simulated wastewater than PAM and linear cationic St-CTA. These results may serve as references for the design and selection of a suitable flocculant in treating target wastewaters.
研究领域:
环境科学
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污水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Fan Wang,Rongrong Ma,Jinling Zhan,Yaoqi Tian
Smart superhydrophobic sorbents are in high demand for cleaning oil spills that could endanger the aquatic ecosystem . Herein, we demonstrated the fabrication of a superhydrophobic and magnetic modular cryogel (SNS@Fe-PSC) containing three starch-based modules, namely, a superhydrophobic nano-coating, a magnetic nanocomposite insertion, and a high-strength starch/polyvinyl alcohol composite substrate. The surface chemical composition and hierarchical micro/nanostructures of this material were investigated in detail. The modular cryogel had a high water contact angle (>151°) and low sliding angle (<9°), as well as excellent water-repellent, self-cleaning, and anti-fouling properties. This material also exhibited good durability owing to its stable chemical bonding and structural support. SNS@Fe-PSC could be applied to remove oil from water effectively. Moreover, the magnetic module (saturation magnetization, 5.04 emu/g) allowed the as-obtained material to be propelled and controlled by a magnet on the surface of water. Variable magnetic-actuated motion direction could be realized by adjusting the position and amount of magnetic modules inserted to the cryogel.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Pan Hu,Kexin Su,Yibei Sun,Pengwei Li,Jun Cai,Hu Yang
Microplastic (MP) pollution has increasingly become an enormous global challenge due to the ubiquity and uncertain environmental performance, especially for nano- and micro- sized MPs. In this work, the performance and mechanisms in coagulation of 100 nm–5.0 μm sized polystyrene particles using an etherified starch-based coagulant (St-CTA) assisted by polysilicic acid (PSA) were systematically studied on the basis of the changes in MPs removal rates under various pH levels and in the presence of different coexisting inorganic and organic substances, zeta potentials of supernatants, and floc properties. St-CTA in conjunction with PSA had a high performance in coagulation of nano- and micro- sized MPs from water with a lower optimal dose and larger and compacter flocs. Besides, the MPs removal rate can be improved in acidic and coexisting salt conditions. The efficient performance in removal of MPs by this enhanced coagulation was owing to the synergic effect, that is, the effective aggregation of MPs through the charge neutralization of St-CTA followed by the efficient netting-bridging effect of PSA. The effectiveness of this enhanced coagulation was further confirmed by removal of two other typical nano-sized MPs, such as poly(methyl methacrylate) and poly(vinyl chloride), from different water sources including tap water , river water, and sludge supernatant from a sewage treatment plant. This work provided a novel enhanced coagulation technique that can effectively remove nano- and micro- sized MPs from water.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Hao Xu,Long Chen,David Julian McClements,Hao Cheng,Jie Long,Zhengyu Jin
With increasing environmental awareness and food safety concern worldwide, biodegradable active food packaging gained wide attention in recent years. Starch has been regarded as one of the most potential biomaterials to produce biodegradable films. However, relatively poor functional performance of starch-based films severely limits their application as food packaging materials. Carbon-based fillers can be used to enhance the functional attributes of starch-based films, but they are often difficult to incorporate because of their poor matrix dispersibility. In this study, we developed a simple green method to improve the dispersity of graphene in starch-based films by modifying the graphene surfaces using mussel-inspired polydopamine and copper ions . Spectroscopy and morphology analyses showed the surface of graphene was successfully modified. The addition of the nanocomposites positively influenced the microstructure of the starch-based films, as well as impacting their mechanical, barrier, and thermal properties. Additionally, the composite films exhibited antibacterial activity against food borne pathogens , suggesting promising potential of the films acting as active food packaging. Overall, the method developed in this study has the potential for optimizing and endowing extra properties of starch-based films so as to increase their application in biodegradable food packaging.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Zhaoyong Gao,Benzhi Ju,Bingtao Tang,Wei Ma,Wenbin Niu,Shufen Zhang
Flocculants are crucial agents in wastewater treatment because they can remove oppositely charged impurities effectively and swiftly. However, flocculation also inevitably causes secondary contamination due to the residual properties, nonreusability, and nondegradability of traditional flocculant molecules. Herein, an ecofriendly starch-based flocculant, i.e., 2,4-bis(dimethylamino)-[1,3,5]-triazine-6-starch, was synthesized via a preactivation-etherification strategy. The large molecular weight property of the flocculant produced by this method enhances the intermolecular hydrophobic association, achieving complete phase separation of all flocculant molecules from water and residue-free flocculation for the first time. Importantly, a large molecular weight tertiary amine starch-based flocculant (LMTS) exhibits a remarkable flocculation capacity of over 1800 mg·g–1 for dye wastewater, which is significantly higher than that of traditional polyacrylamide and polyaluminum chloride flocculants. Furthermore, the LMTS flocculant could be recycled by pH adjustment, and its structural stability ensured sustained reusability. This high-performance residue-free biomass-based flocculant offers a green advance for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2016
·
IF 5.991
Hu Wu,Zhouzhou Liu,Hu Yang,Aimin Li
Three different starch-based flocculants with various chain architectures and charge properties have been prepared through etherification, graft copolymerization , or their combination. Two of the flocculants (starch- graft -poly[(2-methacryloyloxyethyl) trimethyl ammonium chloride] and starch-3-chloro-2-hydroxypropyl triethyl ammonium chloride , denoted as STC- g -PDMC and STC-CTA respectively) are cationic, and another one (carboxymethyl starch- graft -poly[(2-methacryloyloxyethyl) trimethyl ammonium chloride], denoted as CMS- g -PDMC) is amphoteric. Those three flocculants have shown far different flocculation efficiency and floc properties for the removal of humic acid (HA) from water due to their distinct structural features. The effects of pH, flocculant dose, and initial HA concentration have been studied systematically. Accordingly, STC- g -PDMC and CMS- g -PDMC with strongly cationic branch chains have much better flocculation performance than polyaluminum chloride (PAC) and STC-CTA, the latter of which features linear chain architecture and strongly cationic pieces lying on its chain backbone. It indicates that the architecture of cationic branch chains plays an important role in HA flocculation due to their significantly enhanced bridging effects. Moreover, STC- g -PDMC has higher HA removal efficiency and better floc properties than CMS- g -PDMC, suggesting that charge neutralization effects make notable contributions to HA removal and that the additional anionic pieces on CMS- g -PDMC can weaken its flocculation performance. In addition, STC- g -PDMC used as coagulant aid for PAC has also been tried, which observably reduces the optimal dose of the inorganic coagulant.
研究领域:
环境科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）