Solar RRL
·
2022
·Vol. 6
·期 7
·2101103
·
IF 9.173
Yao Li,Siqi Li,Yan Li,Xiangnan Sun,Xinding Lv,Yan-Zhen Zheng,Meilan Huang,Xia Tao
The substitution of a portion of methylammonium (MA) for guanidinium (GA) has been verified to be able to enhance the stability of MA-based devices. However, high-dose guanidinium cation will introduce localized distortions to the perovskite lattice structure and destroy the microstructure of the perovskite films, impairing the stability and reproducibility of perovskite solar cells (PSCs) eventually. Herein, for the first time, the NH 4 Br-assisted all-atmospheric two-step process is adopted to fabricate GA-rich (20%) perovskite films. The NH 4 Br induces the formation of the intermediate phase NH 4 PbI 3 and alleviates the disorder of the octahedron caused by the big GA. Consequently, the modified perovskite film shows increased tolerance for the roughness fluctuation and reduced risk of forming voids and pinholes. The fabricated compact GA-rich perovskite films behave extremely well in photovoltaic performance when assembled as carbon-based perovskite solar cells, delivering a high power conversion efficiency (PCE) of 16.19% and stability against moisture and sunlight. Especially, the unencapsulated devices in ambient air sustain 95.1%, 91.8%, and 95.7% of their initial PCEs after 2400 h of storage, after 1000 h of 65 °C heat environment, and after 800 h of sunlight illumination, respectively.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Shiyu Zhang,Runnan Zhang,Runlai Li,Zixuan Zhang,Yafei Li,Hao Deng,Junhui Zhao,Tianrun Gu,Mengying Long,Xiaoyao Wang,Sui Zhang,Zhongyi Jiang
Positively charged nanofiltration membranes hold great potential in Li + /Mg 2+ separation, but their application in alkaline solutions, such as alkaline salt-lake brines has not been reported. Herein, inspired by the arginine's unique structure and biological function, we explore superstrong basic triaminoguanidine (TG) molecule as aqueous monomer to fabricate positively charged polyamide nanofiltration membranes for Li + /Mg 2+ separation. With the Li + /Mg 2+ mass ratios of 1:50 and 1:120, at pH 9.6, the separation factors (S Li,Mg ) of membranes reach 31.8 and 20.9. Meanwhile, at pH 5.6, the S Li,Mg are 46.4 and 36.4, which are the ever-reported highest value and such high S Li,Mg can be well retained in the pH range of 5.6–8.6. The superior Li + /Mg 2+ selectivity stems from the superhigh protonation capacity of guanidine groups in a broad pH range.
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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Haocheng Yang,Xuejie Guo,Rongrong Chen,Qi Liu,Jingyuan Liu,Jing Yu,Cunguo Lin,Jun Wang,Milin Zhang
In seawater, biofouling caused by marine organisms’ adhesion on the surface of adsorbent would lead to a significant decrease in adsorption property. Herein, a poly (guanidine-hexamethylenediamine-phytic acid) hybrid sponge (PGHPA-PDF-MF) was synthesized for integration of uranium uptake from seawater with antibiofouling property. The PGHPA-PDF-MF sponge exhibited the superhydrophilicity and retained nearly 29 kPa of compression stress after 1000 cycles. Noteworthy, the PGHPA-PDF-MF sponge showed obviously anti-algae growth behavior (88% cell death rate) due to its guanidine and phytic acid groups, as well as inhibit adhesion of algae ( Nitzschia ) and mussels ( Mytilus edulis ) by the co-effect of its function groups, 3D porous sponge structure and superhydrophilic surface. The saturated U-uptake amount of PGHPA-PDF-MF sponge was high as 531.9 mg/g at nearly seawater pH (~8.0). At 5th cycle, the sponge still had superior reusability and maintained a high removal amount (200.7 mg/g). The uranium uptake amount of PGHPA-PDA-MF sponge was 44.75 mg/g with 90.9% of removal efficiency in uranium and Nitzschia contained artificial seawater at 7 days. Furthermore, more than 80% of uranium removal rate for the PGHPA-PDF-MF sponge in natural seawater (Bohai, China) also showed its great potentiality for actual application.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 11
·1846
·
IF 3.164
Yuanfeng Pan,Xiao Zhao,Xiaoning Li,Pingxiong Cai
Developing the ideal biomaterials for wound dressing still remains challenging nowadays due to the non-biodegradable features and the lack of antimicrobial activity of conventional synthetic polymer-based dressing materials. To tackle those problems, a novel and green-based antimicrobial hydrogel dressing was synthesized in this work via modifying sugarcane bagasse cellulose with guanidine-based polymer, followed by crosslinking antimicrobial-modified cellulose with unmodified one at various ratios. The resulting hydrogels were comprehensively characterized with swelling measurements, compression test, Fourier transform infrared spectroscopy, and scanning electron microscopy. The results indicated that the dressing possessed the degree of swelling up to 2000% and the compress strength as high as 31.39 Kpa, at 8:2 ratio of pristine cellulose to modified cellulose. The antibacterial activities of the dressing againstE. coliwere assessed using both shaking flask and ring diffusion methods. The results demonstrated that the dressings were highly effective in deactivating bacterium without leaching effect. Moreover, these hydrogels are biocompatible with live cell viability responses of (NIH3T3) cells above 76% and are very promising as wound dressing.Keywords:cellulose;guanidine-based polymer;hydrogel dressing;antimicrobial activity
研究领域:
生物材料
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伤口愈合
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可持续材料
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抗菌技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2014
·
IF 3.916
Kai Liu,Yaoguang Xu,Xinxing Lin,Lihui Chen,Liulian Huang,Shilin Cao,Jian Li
In order to improve the strength property and antimicrobial activity of paper simultaneously, we prepared a novel multifunctional agent based on carboxymethyl cellulose (CMC) by a simple two-stage method. The first stage was the oxidation of CMC to obtain the dialdehyde CMC (DCMC), and the second stage was the graft of guanidine hydrochloride (GH) onto DCMC to obtain DCMC-GH polymer. The strength property and antimicrobial activity of DCMC-GH-coated copy paper have been studied by the tensile test and inhibition zone method, respectively. The results showed that the dry strength index could increase about 20% after the paper was coated with DCMC-GH. The coating of DCMC-GH on paper also resulted in excellent antimicrobial activities against Escherichia coli and Staphylococcus aureus , and the inhibition zone became larger as the GH content grafted on DCMC increased. The novel DCMC-GH polymer would be a multifunctional coating agent for food packaging paper.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Fan Gao,Hao Wen,Sen Feng,Meng Li,Lingyun Zhu,Yongzhi Zhang,Yilong Xi,Xianling Xiang
The emerging contaminants metformin (MET) and its degradation product guanylurea (GUA) are released into aquatic environments through wastewater treatment plants (WWTPs). Thus, the environmental risks of wastewater with more treatments may be underestimated due to the lower effect concentration of GUA and the higher detected concentration of GUA in treated wastewater in comparison with MET. In this study, we aimed to investigate the combined toxicity mode of MET and GUA to Brachionus calyciflorus by simulating the degrees of wastewater treatments through adjustments to the ratio of MET and GUA in medium. The results showed that the 24 h-LC 50 of MET, GUA, their mixtures of equal concentrations and the mixtures of equal toxic units to B. calyciflorus were 907.44, 544.53, 1185.82 and 940.52 mg/L, respectively, demonstrating GUA is significantly more toxic than MET. An antagonistic interaction between MET and GUA was found in mixture toxicity assessments. Compared with the control, MET treatments only significantly affected the intrinsic rate of population increase of rotifers (r m ), while all life-table parameters were significantly affected by GUA. In addition, at medium and high concentrations (120 and 600 μmol/L), the net reproductive rate (R 0 ) and r m of rotifers under GUA were significantly lower than those under MET. Notably, increased proportion of GUA relative to MET in binary-mixture treatments resulted in increased survival risk and reduced fecundity of rotifers. Moreover, the responses of population dynamics to exposures of MET and GUA were mainly attributed to the reproduction of rotifer, indicating that an improved wastewater treatment process is necessary to protect aquatic ecosystems . The study highlights the importance of considering the combined toxicity of emerging contaminants and degradation product in environmental risk assessment , especially the unintentional transformations of parent compound in treated wastewater.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Weixing Xiong,Xiyu Wang,Yuanyuan Liu,Caihui Luo,Xinhua Lu,Yuanli Cai
Polymerization-induced electrostatic self-assembly (PIESA) represents a powerful method for the scalable synthesis of polyion complex (PIC) nanoparticles with various morphologies. Previous PIESA was driven by Coulombic interactions. Yet, biomimetic multivalent interactions, e.g., ionic hydrogen bonds omnipresent in proteins and potentially enabling access to new materials, remain unexplored. Herein, we update PIESA using arginine-like full-spectrum guanidinium ionic hydrogen bonds. Kinetic studies unravel that, at guanidinium-starving n+/n– (0.84), guanidinium interactions evolve from opposite-charge (6–73% conversion) into like-charge ionic hydrogen bonds (84 to >99% conversion), leading to ultrasmall clusters (2–5 nm, at 6–84% conversion) and size-tunable “large compound micelles” (14–25 nm, at 90 to >99% conversion). Longer guanidinium-block length results in the transformation of charge-neutral worms to positive-charge micron-scale large-area monolayer lamellae to multilayer platelets to tubular networks to vesicular aggregates, suggesting that the like-charge ionic hydrogen bonds are strong enough to overwhelm Coulombic repulsive interactions, and thus to revolutionize our PIESA chemistry for the precision synthesis of next-generation nanostructured biomimetic functional materials.
研究领域:
材料科学
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聚合物化学
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纳米技术
·
生物材料
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Guiqing Liu,Yunyi Han,Yuwei Hou,Yanjun Li,Xinxin Yang,Zhaocen Dong,Meili Guan,Xuezhong Gong,Jianguo Tang
In this work, a water-soluble guanidyl-imidazoline ( G ) was synthesized and used as a fluorescent probe to detect Zn 2+ in an aqueous environment without any mutually soluble organic solvent. G demonstrates excellent selectivity for Zn 2+ and strong anti-interference ability against other metal ions. It has an ultra-low detection limit of 25 nM for Zn 2+ ions, surpassing previously reported achievements. Job’s plot method, FTIR and XAFS revealed the binding mode of the G -Zn complex that the N atom in the G coordinates with Zn 2+ in a ratio of 2:1. Furthermore, this probe was successfully utilized for quantitative detection of Zn 2+ ions in tap water and synthetic water, and also applied to imaging Zn 2+ ions in living cells.
研究领域:
化学
·
生物分析
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Chao Xiong,Ying Li,Shixing Wang,Yang Zhou
A new adsorbent was prepared via modifying nanosilica with guanidinium ionic liquids for effectively adsorbing gold ions from aqueous solution. Fourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) were used to characterize the adsorbent. Batch experiments were applied to investigate the effects of initial pH, initial gold ions concentration, contact time and coexisting ions on the removal of gold ions from aqueous solutions. The adsorbent exhibits an excellent selectivity for gold ions in the presence of Pb(II), Mg(II), Ba(II) and Cu(II) ions. The removal rate of gold ions is higher than 97.06% in the pH ranges from 2 to 5. The maximum uptake was 120.56 mg/g under pH 5. The adsorption kinetic was well described by the pseudo-second-order model. The adsorption isotherm followed Hill model very well. Therefore, the new adsorbent has a potential application in the field of separation of gold ions from aqueous solutions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Donghua Jin,Ying Wang,Dalei Song,Jiahui Zhu,Jing Yu,Qi Liu,Jingyuan Liu,Rumin Li,Peili Liu,Jun Wang
Uranium adsorption from seawater can provide a sustainable development path for the future raw material supply of nuclear energy. However, in the process of uranium extraction from seawater, biofouling adheres to the surface of the adsorbent, wasting the adsorption sites and seriously affecting the adsorption capability of the adsorbent. Herein, inspired by the superanti-biofouling property of guanidine groups, a superantibacterial and knitted adsorbent with guanidine and amidoxime groups cografted on natural bamboo strips (G-AOBS) is synthesized to adsorb uranium from simulated seawater. The intrinsic structure of bamboo is not destroyed by the whole grafting process, and G-AOBS still maintains the porous and cellulose crystalline structure. The grafting of guanidine groups improves the hydrophilicity and significantly enhances the anti-biofouling performance, thereby increasing the adsorption capacity for uranium (q e = 201.4 ± 13.23 mg g −1 at pH = 4 with C 0 = 100 mg L −1 and q e = 1.04 ± 0.12 mg g −1 in simulated seawater with C 0 = 500 μg L −1 ). According to the results of DFT, the guanidine and amidoxime groups can not only replace one carbonate in uranyl tricarbonate alone to form a more stable coordination structure but also have a synergistic effect between the two, that is, using three “bridging hydrogen bonds” to form the most stable chelation mode with uranyl dicarbonate.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ziheng Bai,Qi Liu,Hongsen Zhang,Jingyuan Liu,Jing Yu,Jun Wang
Plenty of uranium resources were consumed with the development of nuclear energy. Therefore, the effective collection of uranium resources has been received much focus. It is well known that the amount of uranium resources in the seawater is abundant. However, the extremely low concentration of U(VI) and complex environments pose are considerable challenges for the extraction of uranium. Herein, the polyethylenimine (PEI) and Guanidineacetic acid (GDAC) were covalently grafted onto the surface of the hemp fibers (HF) to prepare a novel 3D reticular anti-fouling green adsorption material. Subsequently, a series of adsorption batch experiments were performed to evaluate the performance of the adsorbent. The experimental results showed that the maximum adsorption capacity of HF-PEI-GDAC is 414.93 mg/g. Meanwhile, the adsorbent exhibited great adsorption properties in simulated seawater. In addition, the adsorbent still presents excellent resistance to the algae adhesion after 15 days. Therefore, the HF-PEI-GDAC can be considered as a highly promising adsorbent for the extraction of U(VI) from seawater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 15
·8799-8812
·
IF 4.21
Sun Lijian,Yang Shuaishuai,Qian Xueren,An Xianhui
Abstract Herein, we introduce antimicrobial activity to cellulose fibers (CFs) by presenting a double “click chemistry” strategy. CFs chemically modified with azide functions are designed as a versatile ligation platform for Cu(I)-catalyzed azide-alkyne click reaction. Glycidyl propargyl ether (GPE) with epoxy groups was grafted onto azidated cellulose fibers (CFs-N 3 ) via azide-alkyne click reaction yielding epoxy cellulose fibers (CFs-Epoxy). Then poly(hexamethylene guanidine) (PHMG) can be chemically grafted onto the CFs to form antibacterial materials (CFs-PHMG) through amino groups initiated epoxy ring-opening click reaction. The results revealed that PHMG was anchored successfully onto CFs via chemical bond formation without significant damage to the morphology of CFs and mechanical performance of cellulose paper. In the antibacterial tests, the functionalized CFs show superior antibacterial activity against E. coli and S. aureus . Importantly, CFs-PHMG paper sheet presented long-term antibacterial effectiveness, remaining ~ 99% antibacterial activity after two months storage in the air environment. This antibacterial CFs-PHMG has good potential application in bioactive paper packaging and medical paper products. Graphic abstract
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）