COLORATION TECHNOLOGY
·
2019
·Vol. 135
·期 6
·451-466
·
IF 1.241
Hongbin Li,Xiangwei Feng,Wenying Shi,Haixia Zhang,Qiyun Du,Longwei Qin,Xiaohong Qin
Hydrophobic polyvinylidene fluoride (PVDF) hollow fibre composite membranes were prepared by the dilute solution coating process to build a special surface structure that was similar to the dual micro-nano structure on the lotus leaf. Poly(vinylidene fluoride-co-hexafluoropropene) was chosen as the hydrophobic polymer candidate in dilute solution. Membrane morphology and surface hydrophobicity were evaluated by scanning electron microscopy and dynamic water contact angle measurement. The prepared PVDF hollow fibre membranes were employed to separate dyes (Congo Red and Methylene Blue) from water by vacuum membrane distillation. The effects of operational conditions (feed temperature, vacuum pressure and feed flow rate) on the vacuum membrane distillation performance of different PVDF membranes were investigated. The results indicated that the water contact angle values of PVDF composite membrane surfaces improved from 93.6° to 130.8°, which was mainly attributed to the formation of micro-nano rods. This structure was similar to the dual micro-nano structure on the lotus leaf. Under test feed temperature, vacuum pressure and feed flow rate conditions, the dye rejection rate of Congo Red and Methylene Blue by the hydrophobic PVDF hollow fibre membrane remained above 99.5% and 99%, which was higher than that of the pristine PVDF membrane (99% and 98%, respectively). In addition, the hydrophobic PVDF hollow fibre composite membrane showed higher permeation flux under different conditions compared with the pristine PVDF membrane, which was attributed to membrane surface hydrophobicity and the electrostatic interactions between dyes and the PVDF membrane surface.
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International Journal of Low-Carbon Technologies
·
2023
·
IF 2.3
Wang Tingting,Yue Xiaoju,Han Lin,Wang Jinnong,Zhang Yuzhen,Tang Xiaofeng,Wang Shifeng
We reported anchoring mesoporous silica onto the microporous metal–organic frameworks (MOF) (UiO-66-NH2) to obtain a hierarchical porous framework (UiO-66-NH2@SiO2). This strategy maintains the high specific surface area (SA) of the MOF and addresses the mass transfer issue frequently encountered in microporous materials, providing more possibilities for subsequent modified structural frameworks. The structural characteristics of UiO-66-NH2@SiO2 were evaluated by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, surface analysis and X-ray photoelectron spectroscopy. In this work, the specific SA of the composite material was 196.667 m2/g, which decreased due to the occupation of some pores by anchored silica. Adsorption experiments showed that the composite material had a better adsorption effect (Congo red, 393.83 mg/g; bromophenol blue, 446.46 mg/g) than UiO-66-NH2, with electrostatic interaction and hydrogen bonding being the main driving forces. Therefore, this is a material that has a positive impact on dye adsorption. The strategy proposed in this work has potential applications not only in the construction of new materials but also in the exploration of dye adsorbents.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weisen Yang,Yifei Liu,Yaqin Zhu,Wenlong Jiang,Fengshuo Shi,Jiapeng Hu,Shaohua Jiang,Shaoju Jian
Aquatic ecosystem contaminated by organic dyes is one of the most crucial issues plaguing people worldwide, while water remediation through adsorption technology is the most sustainable option. Herein, two chitosan-based adsorbents were successfully fabricated by a facile one-step method under alkaline condition via electrospraying technology, then the above two materials were cross-linked with epichlorohydrin and grafted triethylenetetramine to prepare two kinds magnetic Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres for remediation of anion dyes namely Congo red (CR) in wastewater respectively. The morphology features, structure, composition, thermal stability, and pore diameter of the two adsorbents were acquired by SEM coupled with EDX, XRD, FTIR, TGA, and BET. The adsorption behavior of Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres towards CR from water was systematically evaluated. The determined isoelectric points (pHpzc) of Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 are orderly 7.4 and 7.8. The results confirmed that the CR remediation process can be simulated by PSO kinetic model ( R 2 > 0.995) along with Langmuir isotherm ( R 2 > 0.998) with maximal CR adsorption amounts by Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres of 1145.42 and 617.28 mg g −1 at pH = 7 and T = 25 °C, respectively. The negative Δ G 0 , positive Δ H 0 (28.65 and 8.02 kJ mol −1 ), and positive Δ S 0 (112.29 and 62.71 J mol −1 K −1 ) signified that the adsorption of CR onto Fe 3 O 4 /CS-ET-1 and Fe 3 O 4 /CS-ET-2 microspheres surface was spontaneous and endothermic in nature. After four consecutive cycles, both magnetic microspheres remained a superior CR removal performance, indicative of the stability and recyclability of the adsorbents.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Zheng Gang,Yi-Wen Cao,Zi-Ying Zeng,Min Chen,Shu-Tong Yang,Miao-Miao Su,Yun-Liu Zeng,Qin Tian,Zhong-Hua Yang
In this work, a magnetic adsorption material based on a metal–organic framework (Fe 3 O 4 @PPy@MIL-53(Fe)) was designed and prepared, as well as used as an adsorbent for the extraction of fungicides from fresh juice and environmental water. The material was subjected to a series of characterization analyses, which showed that the material has good potential for application as an adsorbent. The main parameters such as adsorbent dosage, adsorption time, elution time, pH value, and elution solvent which could affect the experiment results were optimized. Under optimal conditions, the method exhibited linearity (R 2 ≥ 0.9994) in the concentration range 10–1000 µg/L for three triazole fungicides , and LOD value ranged from 2.1 µg/L to 2.9 µg/L. In addition, the established method was applied to real samples of three fruit juices and two ambient waters, and satisfactory recoveries in the range of 78.6%-105.4% and RSDs of ≤ 5.7% were obtained.
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Water
·
2023
·Vol. 16
·期 1
·167
·
IF 3.4
Tiantian Chen,Jiayu Sun,Ruixue Jiang,Tongfei Zhang,Yulei Zhang,Xiaochen Li
Purified red phosphorus (RP) can be used as an adsorbent. However, the adsorption mechanism and reuse ability of purified RP have not been reported. This study utilized X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy techniques (a statistical physics model and the standard molar free energy of formation) to investigate the adsorption mechanism of methylene blue (MB) by purified RP. Purification did not change commercial RP structure according to X-ray diffraction. The results showed that the adsorption process only included physical adsorption according to Fourier transform infrared spectroscopy and UV–vis diffuse reflection absorption spectra. The specific areas of commercial RP and purified RP were 0.02 cm3/g and 5.27 cm3/g, respectively. Thus, purified RP has a higher adsorption capacity compared with commercial RP. A statistical physics model showed that, as the temperature increased from 288 to 308 K, theqe,Dmandqsatof purified RP for MB increased from 179.87, 0.824 and 0.824 to 303.26 mg/g, 1.497 mol/kg and 1.497 mol/kg, respectively. The fitted values of ΔrSmθ, ΔrHmθand ΔrGmθwere 104.38 J·mol−1·K−1, −2.7 × 103J·mol−1and negative, respectively. Thus, according to adsorption energy, the adsorption of MB by purified RP was a spontaneous process, which was mainly driven by entropy increasing. Compared with neutral dye, the purified RP had higher adsorption ability for the cationic dye and anionic dye. As the purified RP dose increased from 30 to 150 mg, the adsorption capacity of purified RP increased. However, as the MB concentration and pH increased, the adsorption capacity of purified RP decreased. The purified RP had excellent reuse ability and high temperature desorption can be applied to obtain its reuse ability.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Meng Zhang,Xi Yu,Min Zhu,Aimin Xiang,Yu’an Bai,Hongfu Zhou
Confronted with severe water contamination induced by organic pollutants, developing low-cost adsorbents with high removal efficiency is a crucial approach to addressing the issue of residual organic pollutants in wastewater. This study prepared polyvinyl alcohol/porous carbon (PVA/C) hydrogels using freeze-thaw cycles and freeze-drying processes. And the adsorption behaviors were investigated with organic pollutants including congo red (CR), ibuprofen and doxycycline hydrochloride (DOX). Compared with pure PVA hydrogels, tensile test showed that PVA/coconut shell carbon hydrogel with a mass ratio of 10:2 (PCS2) had an increase of 285.78% in tensile stress. Through the adsorption experiment, PCS2 hydrogel demonstrated a good adsorption capacity for CR (27.39 mg/g), ibuprofen (15.48 mg/g), and DOX (17.07 mg/g). Furthermore, the adsorption mechanism of three organic pollutants by PCS2 hydrogel consistent with quasi-first-order kinetic and Freundlich adsorption isotherm model, indicating its adsorption process was dominated by multilayer physical adsorption. Therefore, this paper built a green, convenient, and economic method to prepare environmentally friendly and multifunctional PVA hydrogels for water purification.
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Small
·
2023
·
IF 13.3
Bo Zhu,Changsheng Guo,Nan Li,Pengbi Liu,Mengchen Zhang,Lijing Wang,Zhiwei Xu
Atomic thick 2D materials hold great potential as building blocks to construct highly permeable membranes, yet the permeability of laminar 2D material membranes is still limited by their irregularity sheep track-like interlayer channels. Herein, a supramolecular-mediated strategy to induce the regular assembly of high-throughput 2D nanofluidic channels based on host–guest interactions is proposed. Inspired by the characteristics of motorways, supramolecular-mediated ultrathin 2D membranes with broad and continuous regular water transport channels are successfully constructed using graphene oxide (GO) as an example. The prepared membrane achieves an ultrahigh water permeability (369.94 LMH bar −1 ) more than six times higher than that of the original membranes while maintaining dye rejection above 98.5%, which outperforms the reported 2D membranes. Characterization and simulation results show that the introduction of hyaluronate-grafted β -cyclodextrin not only expands the interlayer channels of GO membranes but also enables the membranes to operate stably under harsh conditions with the help of host–guest interactions. This universal supramolecular assembly strategy provides new opportunities for the preparation of 2D membranes with high separation performance and reliable and stable nanofluidic channels.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2023
·
IF 3.3
Gang Liu,Sheng Xu,Wenting Li,Zhenxi Wang,Meng Cao,Jinlong Cui,Xinde Jiang,Zhengqiu Li
In order to improve the visible light catalytic activity of TiO 2 , the TiO 2 @g-C 3 N 4 (TCN) composite catalysts with three-dimensional porous structure and rich active sites were prepared by hydrothermal method and calcination method orderly. The synthesized TCN composites microstructures were thoroughly characterized and their performance for the photocatalytic degradation of organic dyes was investigated. The results show that the prepared composites formed the heterojunctions with a core-shell structure, which can effectively broaden the absorption spectrum of TiO 2 to visible light region. In the degradation experiments, the TCN composites exhibited excellent photocatalytic degradation effect on organic dyes, which can reach 99.65% under visible light irradiation for 2 h. The strong acid condition was benefit to the catalytic process. After five cycles of testing, the degradation efficiency of organic dyes can still maintain at 95.62% level, which indicate that the TCN composites had excellent visible light catalytic activity and reusability.
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ENERGY & FUELS
·
2023
·
IF 5.3
Xingyu Zhang,Luqi Wang,Tianye Zheng,Kwok-Ho Lam
This work successfully introduced the different ratios of metallic Cr into micrometer Si bulk via a high-energy ball-milling method to synthesize nanostructured Si/CrSi2 alloy anodes with enhanced electrochemical performance in lithium-ion batteries (LIBs). This study demonstrated that the in situ-formed CrSi2 could effectively suppress the generation of crystalline Li3.75Si in the lithiation process, dilute Si’s volume expansion, and improve electronic conductivity. Concretely, Si85Cr15 displayed an outstanding reversible volumetric capacity of ∼1400 A h·L–1 and 100-cycle capacity retention at 0.2 C of 90.1% with an average Coulombic efficiency of 99.46%. Moreover, another advantage of Si85Cr15 is good compatibility with the carbon-coating treatment at 800 °C by virtue of the reinforced thermal stability derived from a high melting point of CrSi2. The homogeneous distribution of Si and metal silicide crystallites was better maintained in Si85Cr15@c-PDA compared to our previously annealed Si–Cu3Si–NiSi2 alloys at the same temperature. Correspondingly, the cycle stability and rate capability of Si85Cr15@c-PDA were further improved with a capacity retention of 93.1/90.6% at 0.2/0.5 C (100/200 cycles) and 40% at 2 C, respectively. The excellent electrochemical performance indicates that Si/CrSi2 alloys may be prospective candidates as compositions in the carbon-coated anode materials for industrialized LIBs.
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Journal of Water Process Engineering
·
2023
·
IF 7
Lilan Huang,Haimei Chen,Jin Han,Haojie Chen,Jian Pan,Zihan Zhao,Zhichao Dong,Hailin Cong
Printing and dying wastewater has a pervasive problem afflicting people worldwide due to negative impacts on ecosystems and humans. Herein, Fe/Cu bimetallic catalyst/polyethersulfone (4A-Fe@Cu/PES) mixed matrix membrane (APMMM) with macropore and high porosity were developed as catalytic membrane reactor for reduction of congo red (CR) in flow-through reaction. The forced flow of the reactants through the membrane improved the mass transfer and intensified the contact between reactants and immobilized catalysts, allowing for efficient adsorption and catalysis. Furthermore, the CR adsorption by 4A-Fe@Cu would form catalytic microzones in the membrane, which was conducive to further improving the catalytic efficiency. As a result, the apparent activation energy of dynamic catalysis (21.1 kJ/mol) was significantly decreased compared with that of static catalysis (93.7 kJ/mol). Therefore, the dynamic processes exhibited more excellent adsorption and catalytic efficiency. In cross-flow circulation mode, the maximum CR adsorption capacity of APMMM-18 (doping amount of 4A-Fe@Cu is 18.0 wt%) was 199.5 mg/g 4A-Fe@Cu with a catalyst/CR mass ratio of 1/1.5 and initial CR concentration of 50 mg/L. For catalysis, the APMMM-18 could remove 99.8 % CR after 5 h with a catalyst/CR mass ratio of 1/1.5 and 1.9 mM of H 2 O 2 at pH 8. The catalytic membranes showed much higher performances than 4A-Fe@Cu particles even under lower H 2 O 2 conditions. The intrinsic CR adsorption and degradation ratio of one layer of APMMM-18 under dead-end filtration was also investigated. The combination of the Fenton catalyst with the membrane process accomplished the effective removal of CR.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lei Jia,Linwen Jiang,Jiawen Hu,Jiawei Jin,Siqin Yan,Anhua Wu,Xiaofeng Zhang
Optimizing the impedance matching via electromagnetic adjustment is considered an effective strategy to accomplish exceptional electromagnetic wave absorption (EMA) performance. Here, we report an efficient and green process to obtain the carbonitriding FeCoNiCr high-entropy alloys (HEAs) with flake-shaped morphology by using organic cyanide (Dicyandiamide, C2H4N4) as nitrogen and carbon sources. The carbonitriding effects on the phase structure, magnetic properties, mechanical hardness, corrosion resistance, high-temperature oxidation resistance, and EMA performances were investigated systematically. The carbonitriding process optimized the impedance match by decreasing the dielectric constant via introducing the nonmetallic C and N. The #CN10 sample exhibited outstanding EMA performances with a minimum reflection loss of −32.3 dB at 7.89 GHz and a broad effective bandwidth of 4.46 GHz, which covered the majority of X-band. In addition, the carbonitriding FeCoNiCr HEAs had great mechanical properties, excellent corrosion resistance, and high-temperature oxidation resistance, indicating excellent adaptability to harsh environments as well as good EMA performances. This work provides a new idea for the preparation and design of carbonitriding EMA materials.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Libing Liu,Lei Du,Sen Lu,Bo Yang,Xu Zhao,Deli Wu,Xunchang Fei,Hongping He,Dongsheng Wang
Various combined processes with pre-coagulation have been developed for biologically treated landfill leachate , but the microscopic-level processes occurring during coagulation remain largely unknown. Herein, dissolved organic matter (DOM) fate using fluorescence excitation emission matrix spectroscopy combined with parallel factor analysis and electrospray ionization coupled Fourier transform-ion cyclotron resonance mass spectrometry and concomitant heavy metal (HM) behaviors were explored at the molecular level. In addition, AlCl 3 and two polyaluminum chloride (PACl) species (dominated by [AlO 4 Al 12 (OH) 24 (H 2 O) 12 ] 7+ and [(AlO 4 ) 2 Al 28 (OH) 56 (H 2 O) 26 ] 18+ , respectively) were used. The results show that all coagulants are efficient at removing DOM. PACl was found to be advantageous over AlCl 3 in overcoming pH fluctuation, which is ascribed to the different dominant mechanisms, namely, entrapment and sweep flocculation for AlCl 3 and charge neutralization for PACl. Consequently, PACl was more effective at removing humic substances , usually high-molecular-weight, oxygen-rich and unsaturated, than protein substances. For HM removal, PACl was likewise better and more stable, where As, Cu, Ni, Co and Hg were removed predominantly via adsorption, and Cr, Zn, Pb, Cd and Mn were removed via coprecipitation . Correlation analysis showed that humic substances tended to complex with HMs and be removed synergistically due to the ubiquitous occurrences of aromatic structures and oxygen-containing functional groups.
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