CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Ling Cai,Guangxue Chen,Bin Su,Minghui He
Ultra-tough transparent conductive elastomers (TCEs) with self-healing performance are of great significance for research in the fields of soft robotics, optical display electronics, wearable electronic equipment and human–computer interaction. However, their limitation, such as the desolventizing process, low polymerization rate or balance between toughness and self-healing performance, cause difficulty in manufacturing by the 3D printing technique. Here, we propose a novel preparation strategy for 3D printed TCEs based on the photopolymerization of maleic acid (MA)/choline chloride (ChCl) and acrylamide (AAm)/choline chloride type polymerizable deep eutectic solvents (PDESs). PDES can polymerize into a tough and rich in hydrogen bonds poly(PDES) in a few seconds without solvent evaporation. The printed TCEs with precision of 10 µm have high transparency (95.6%) and stable electrical signals at 50% compression for 10,000 cycles. In addition, efficient self-healing performance due to the dynamic hydrogen bonds of poly(PDES) provides broad application prospects for 3D printed TCEs in long-term pressure-resistant intelligent applications.
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高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Chen Kaiwei,Du Linlin,Gao Peng,Zheng Junli,Liu Yuanli,Lin Hua
The carboxylate-functionalized passion fruit peel (PFPCS) was an efficient and rapid biosorbent for wastewater treatment. The PFPCS exhibited excellent selectivity to the cationic dyes, where the maximum adsorption capacities for methylene blue (MB) and methyl violet (MV) were 1,775.76 mg g−1 and 3,756.33 mg g−1, respectively. And the adsorption process of MB and MV on PFPCS reached equilibrium within 20 min. Moreover, the adsorption conditions and mechanisms were investigated. The adsorption process was in good agreement with the pseudo-second-order and Langmuir isotherm models. The adsorption mechanism was also proposed to be electrostatic interaction and hydrogen bond. After six cycles of desorption-adsorption, the removal efficient of MB and MV could be kept above 95%. Thus, PFPCS was considered as a highly efficient absorbent for removing cationic dyes from polluted water due to excellent adsorption characteristics, low cost and environmental friendliness.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Lipei Ren,Guomeng Zhao,Luqi Pan,Bei Chen,Yali Chen,Qian Zhang,Xingfang Xiao,Weilin Xu
Adsorption techniques have been successfully applied in water purification because of their flexibility, simplicity of design, and effectiveness. Activated carbon is an effective absorbent using for dye adsorption; however, the powder structure is not conducive for practical applications and cannot be used to filter dye solutions which are challenges that still need to be addressed. Herein, a natural cellulose-based absorbent, activated carbon-Juncus effusus fiber (AC-JE fiber), demonstrates the removal of all kinds of dyes without selectivity and humic substances and humic-like organics from wastewater. The combined macroporous structures of JE fibers and the microporous and mesoporous structures of activated carbon particles enhance their adsorption properties. These composite absorbents have excellent adsorption and continuous filtration effect. The rejection rate is approximately 100% not only on acidic and anionic dyes but also on basic and cationic dyes. Moreover, the dye solution adsorbed by AC-JE fibers exhibits an ideal freshwater quality (almost no bacteria), similar to that of the deionized water. The AC-JE fibers prove their potential for dye removal, in both adsorption and filtration. Their sterilization ability substantiates their potential in the field of water purification as they can be used as ideal absorbents based on cellulose for removing dyes and purifying wastewater.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Jiying Men,Hongxing Shi,Chengya Dong,Yuanyuan Yang,Yuanrui Han,Ruixin Wang,Yiqing Zhang,Ting Zhao,Jun Li
A novel adsorbent with high adsorption capacity to remove cationic dyes was synthesized. Sodium 4-styrene sulfonate (SSS) was grafted polymerization on the surface of magnetic chitosan microspheres via -NH 2 /S 2 O 8 2− surface initiating system, obtaining MCS-g-PSSS microspheres. The grafted microsphere was characterized by Fourier transforms infrared spectroscopy , X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, vibration sample magnetometer and the Brunauer-Emmett-Teller. Cationic dyes were adsorbed by MCS-g-PSSS and methylene blue(MB) was acted as a typical example. The adsorption performance was explored by varying experimental conditions. The results showed the maximal adsorption capacity was 989 mg/g at pH 1 at 25 °C. The pseudo-second order model was found to be applicable for the adsorption kinetics . The adsorption capacity increased with rising temperature and it decreased owing to adding of ions. The adsorption isotherms were the best fitted by Langmuir. MCS-g-PSSS for MB showed high adsorption capacity due to the strong electrostatic interactions and π-π stacking, which was explained by FTIR and XPS and was verified by DFT calculations. The degree of adsorption spontaneity increased with rising the temperature. The grafted MCS-g-PSSS microspheres had high adsorption capacity for various kinds of cationic dyes and excellent for remove MB in the aqueous solution.
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高影响因子
Molecular Catalysis
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2021
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IF 5.062
Ruixue Wu,Caifeng Bi,Xia Zhang,Jinmiao Wang,Lulu Wang,Chuanbin Fan,Mei Wang,Feng Shao,Nana Li,Ziao Zong,Yuhua Fan
Two novel Co-MOFs constructed from aromatic polycarboxylic acid named {[Co(tib) 2 (bimb) 2 ]·4H 2 O} n (tib = 3-((4-(1H-1,2,4-triazol-1-yl)benzyl)oxy)benzoic acid, bimb = 1,4-bis(imidazole-1-ylmethy) benzene) and {[Co 2 (bipa) 4 (bibp) 6 ]} n (bipa = 2-(4-carboxy-2-nitrophenoxy)-6-nitroterephthalic acid, bibp = 4,4′-bis(imidazolyl) biphenyl), have been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra, powder X-ray diffraction (PXRD), thermogravimetric analysis (TG) as well as electrochemistry. The single-crystal X-ray diffraction analysis indicates that Co-MOF 1 exhibits an uninodal net with a (6 5 ·8) topology, whereas Co-MOF 2 exhibits an uninodal 4-connected framework with a (4 4 ·6 2 ) topology. The electrochemistry studies demonstrate that both of the two Co-MOFs can behave as the efficient electrocatalysts for water oxidation in a mild neutral system at the potential around 1.20 V vs. NHE with comparatively low overpotential ( η ) for Co-MOF 1 and 2 of 337–541 mV vs. NHE. Moreover, the two Co-MOFs also show good photocatalytic degradation capabilities toward MB/MV dyes under UV irradiation, and the mechanism studies demonstrate that the main active species are · OH radicals. Therefore, these bi-functional Co-MOFs materials can be treated as convenient and efficient catalysts for the oxygen evolution reaction and aromatic dyes degradation.
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JOURNAL OF POLYMER SCIENCE
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2021
·Vol. 59
·期 11
·1065-1071
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IF 0
Yi-Ning Hu,Qiao-Mei Li,Yan-Feng Guo,Li-Jing Zhu,Zhi-Xiang Zeng,Zhu Xiong
Here, polyvinylidene fluoride (PVDF) membranes were fabricated via non-solvent induced phase separation (NIPS) using dopamine (DA) and polyethyleneimine (PEI) as the hydrophilic additives, which has a loose surface and somewhat improved hydrophilicity. Then nanofiltration (NF)-like thin-film composite forward osmosis (TFC FO) membrane with a loose polyamide (PA) active layer on the blend membrane was synthesized via the interfacial polymerization. The as-prepared NF-like TFC FO membrane exhibited a high water flux ( J w ) of 29.98 L m −2 h −1 and a much low specific salt flux ( J s /J w ) of 0.018 g/L, when 0.6 M NaCl was used as draw solution (DS). It had a superior rejection of malachite green (99.6% ± 0.1%) and a low rejection of NaCl (27.4% ± 4.2%), when filtrated malachite green/NaCl mixture solution in active layer-facing draw solution (AL-FS) mode. The results provide new insights on the design and preparation of FO membranes of selective separation for dyes from salty water. Graphical
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Journal of Environmental Chemical Engineering
·
2020
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IF 4.3
Xianda Liu,Zhengxiang Zhou,Jiarui Yin,Chao He,Weifeng Zhao,Changsheng Zhao
Based on the strategy of copolymerization, methacrylatoethyl trimethyl ammonium chloride (DMC) and acrylamide (AM) copolymer hydrogel particles (PCM HPs) were prepared by precipitated droplets in-situ cross-linking polymerization, to overcome the easily fragile property of pure PDMC HPs and the low adsorption capacity of pure PAM HPs. Corn oil and deionized water were used for the reaction, which would not cause any pollutions; and the preparation process only took 40 s. Through the studies on various feeding ratios of DMC to AM, the hydrogel particles (PCM 5-1 HPs) with the mass ratio of 5:1, showed the best mechanical strength and adsorption capacity. The compression strength of the PCM 5-1 HPs was 207.7 K Pa, and no obvious mechanical loss occurred during five compression-rebound cycles. In addition, the removal ratios of anionic dyes such as amaranth red, orange G, and methyl orange were all higher than 94% (the initial dye concentration was 100 μmol/L and the adsorbent mass was 4 mg); and the adsorption capacity of orange G could reach as high as 992.63 mg/g. Meanwhile, the PCM 5-1 HPs exhibited excellent selective adsorption of anionic dyes in mixed dye solutions. Therefore, the hydrogel particles prepared by the fast and environmental-friendly method had both mechanical strength and ultrahigh adsorption capacity, which verified their practicality in the removal of anionic dyes in sewage.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
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IF 1.687
Hucheng Ge,Ze Zhang,Xiaowei Zhao,Hai Li,Jingyi Sun,Xiaojun Jv
Since organic dyes are poorly biodegradable and completely soluble, they are difficult to be efficiently and rapidly removed. Therefore, a poly(itaconic acid)/magnetite sepiolite composite (PIA/MSEP) is prepared via a simple and environmentally friendly approach. The resulting adsorbent is employed for adsorption of methylene blue (MB) and methyl violet (MV). Factors influencing dyes adsorption efficiency are systemically researched, such as pH, contact time, temperature, and initial concentration of dye. Under optimal experimental conditions, the adsorption behaviour is satisfactorily modelled by the Langmuir model, and the maximum adsorption capacity reaches 196.08 and 175.44 mg · g −1 for MB and MV, respectively. Adsorption is a fast process, well represented by pseudo-second-order rate expression, and being the equilibrium reached as short as 30 minutes for both MB and MV. The thermodynamic parameters suggest a favourable, spontaneous, and endothermic process. Fast, kinetic, and convenient magnetic separation, and a high adsorption capacity, make PIA/MSEP composite an impressive adsorbent for adsorption of organic dyes.
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ANALYST
·
2021
·Vol. 146
·期 6
·1996-2008
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IF 4.616
Taotao Fan,Zongcheng Yan,Chanyuan Yang,Shunguo Qiu,Xiong Peng,Jianwei Zhang,Lihua Hu,Li Chen
A series of natural, environmentally friendly and low-cost menthol-based hydrophobic deep eutectic solvents (DES) were synthesized to extract and concentrate solutes from dilute aqueous solutions, especially triphenylmethane (TPM) dye micropollutants. The system has excellent extraction performance for TPM. Density functional theory (DFT) and molecular dynamics (MD) simulation were used to quantitatively analyze the effect of the DES composition and TPM structure on the distribution of target molecules in two phases. The solvation free energy of ethyl violet (EV) in DES (−17.128 to −21.681 kcal mol−1) is much larger than that in water (−0.411 kcal mol−1), and increases with the increase of the HBD chain length, which is proportional to the extraction rate, indicating that the TPM molecules are more inclined to the DES environment, especially long-chain DES, than aqueous solution. For the same C12DES, the extraction efficiency of the TPM dyes follows the order: ethyl violet (EV) (99.9%) > crystal violet (CV) (99.6%) > methyl violet (MV) (98.8%). EV has the smallest positive charge and the smallest dipole moment (9.109 D), and the Flory–Huggins parameters of EV (χEV–C12DES 0.053) relative to MV and CV are the smallest in C12DES, and are also the largest in water (χEV–H2O 0.053), indicating that EV has the largest polarity difference with H2O and is more easily detached from water and compatible with the long-chain DES phase. The motion of EV and MV on the phase interface of DES and water was calculated to further analyze from the molecular level. At the same time, EV tends to move into the DES phase. In summary, the excellent extraction ability of DES for TPM is verified through experiments and simulations, providing solid theoretical support in terms of separation in other fields.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Lunqiang Jin,Yusha Gao,Jiarui Yin,Xiang Zhang,Chao He,Qiang Wei,Xiaoling Liu,Feng Liang,Weifeng Zhao,Changsheng Zhao
Functionalized sponge adsorbent was prepared by a mussel-inspired strategy, which achieved successive modification of material and remained the properties of substrate. The dopamine derivative, DOPAm, was synthesized and adhered to polyurethane (PU) sponge before in situ polymerization with sodium p-styrenesulfonate. The adsorbent showed superior removal efficiency for cationic dyes (98.9 % for methylene blue (MB) at the concentration of 200 μmol/L); it took 1 s only for the adsorbent to adsorb the dyes by swelling and squeezing out the bulk solution simply. Meanwhile, the superior adsorption effect of the adsorbent could be maintained in a wide range of solution pH values from 1 to 13 at room temperature (293 K) in several repeat experiments, due to the slight influence of strong acid and alkali on polysulfonate. With unchanged other experimental conditions, the removal efficiency is still more than 90 % after reusing for 10 times at the different concentrations of MB dye solutions (50, 100, 200 μmol/L). For large-scale wastewater treatment, with the removal efficiency of 80.0 %, the adsorbent could purify 4.1 L wastewater containing MB dye (100 μmol/L) with the maximum flux of 22.2 L/(m 3 ·s) without the assistance of any equipment except for a vacuum pump. Therefore, the adsorbent has great possibilities to be applied in high-efficient and convenient treatment of wastewater in a large scale.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lunqiang Jin,Haifeng Ji,Yusha Gao,Tao Xu,Shengde Xu,Xiang Zhang,Xiaoling Liu,Feng Liang,Weifeng Zhao,Changsheng Zhao
Developing high-efficiency adsorbents by facile approaches for sewage treatment is high demand but challenging, numerous scientists have made great efforts to fabricate such adsorbents by controlling the structures and functional groups. However, simultaneously improving the adsorption amounts and rates for the microcontaminants seems to be incompatible, which has been puzzling researchers for a long time. To face this challenge, herein, we provided a solution from a strategic perspective instead of only developing a material. We conceived that the key to realize this target was achieving instantaneous diffusion of microcontaminants, and then used regenerative carboxylated sponge ( RCS ) to verify our supposition. As a result, just by simply swelling and squeezing, the sponge could instantaneously clean the positively-charged microcontaminants at a high concentration (1000 μmol/L) and high clearance ratios (the ratios for methylene blue, methyl violet, Cu 2+ , Cr 3+ and Co 2+ were 99.2%, 99.1%, 92.1%, 68.4% and 60.2%, respectively), what’s more, only in one second. Additionally, the sponge could also fulfill large-scaled water purification via suction filtration, and a fast flux of up to 45,000 L/m 3 ·h with ultrahigh clearance ratios (as for positively-charged dyes, the clearance ratios were more than 99%; as for heavy metal ions, the clearance ratios were more than 90%) could be achieved. Additionally, with the advantages of the high adsorption capacity and excellent recyclability, the sponge exhibited long-term purification ability, which might be promising for both small and large-scaled sewage treatment. More importantly, we believed that this strategy might not only be applied in the field of sewage treatment, but also be referenced in the field of bacterial eradication and blood purification, etc.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 16
·165101
·
IF 3.551
Shengqiang Zou,Fan Guo,Lin Wu,Huixiang Ju,Mingzhong Sun,Rong Cai,Lixia Xu,Yuhua Gong,Aihua Gong,Miaomiao Zhang,Fengyi Du
The antioxidant activity of ceria nanoparticles is tightly regulated by size distribution and heteroatom doping. Inspired by this rule, cerium and praseodymium codoped carbon quantum dots (Ce/Pr-CQDs) were synthesized through the one-pot hydrothermal carbonization method. Taking intrinsic advantage of CQDs, the resultant Ce/Pr-CQDs exhibited uniform and ultra-small morphology with an average size of 2.8 nm, which led to an increased proportion of Ce3+. In addition, the doping of Pr into Ce-CQDs improved the redox properties. As we expected, the Ce/Pr-CQDs possessed enhanced hydroxyl radical scavenging properties compared with the cerium-doped carbon quantum dots (Ce-CQDs). Furthermore, Ce/Pr-CQDs with favorable biocompatibility and negligible cytotoxicity are readily internalized into cytoplasm, decreasing the level of reactive oxygen species (ROS). Taken together, the resultant Ce/Pr-CQDs displayed great potential for applications relating to oxidative-stress-associated disease.
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危险品化学品经营许可证（带存储）