SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Hongyu Chen,Wenjun Jiang,Keqi Shi,Chunlin He,Guoyuan Yuan,Bo Yu,Min Li,Jian Feng
The separation and upcycling of nickel from industrial wastewater is significant because it is harmful to the environment and human health. With the development of special engineering plastics industry, a substantial amount of polyimide (PI) scrap is generated. In this study, an amine and carboxyl functionalized PI (PI-AC) was prepared from waste-derived PI foam for the adsorption and separation of Ni(II). The adsorption performance of PI-AC can be modulated by adjusting the ratio of functional groups. PI-AC demonstrated rapid adsorption kinetics (<5 min) for Ni(II) and effectively adsorbed Ni(II) from real wastewater in column experiments. PI-AC shows a competitive dynamic adsorption capacity for Ni(II) (222.59 mg/g) as compared with most of the reported adsorbents. Furthermore, the successful removal of Ni from low-concentration simulated Ni-containing wastewater (7.18 mg/L) results in a residual Ni concentration (0.001 mg/L) that complies with the emission standard. The porous structure of the PI foam enables rapid adsorption of nickel and column adsorption was successfully achieved. The adsorption performance exhibited maintained stably even after five cycles, demonstrating excellent recoverability. The characterizations, comparison studies, and DFT calculations demonstrated that one nitrogen atom in the amine group and one oxygen atom in the carboxyl group act as a bidentate ligand to chelate with Ni(II). This study opens a new way for the treatment of wastewater using PI foam scrap, which coincides with the idea of “treating the waste with waste”.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2022
·
IF 2.455
Zhi-Ke Wang,Ting-Ting Li,Hai-Tao Ren,Hao-Kai Peng,Bing-Chiuan Shiu,Jia-Horng Lin,Ching-Wen Lou
In this study, a hydrogel composite adsorbent structure was reported and showed satisfactory adsorption performance. The study uses polylactic acid melt-blown nonwoven fabric to optimize and improve the adsorption performance of the hydrogel. The results show that the nonwoven fabric structure enables the composite material to reach the swelling equilibrium faster than the hydrogel. The adsorption-isotherm model found that the adsorption capacity of composite materials Pb(II) and Ni(II) reached 416.07 and 243.10 mg/g, respectively, and still had high removal efficiency at low pH. The composite material has low cost and can be reused, which solves the problems of difficulty in recovery of the hydrogel adsorbent, low strength, and easy damage, and promotes the industrialization of the hydrogel as an adsorbent.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
·
IF 6.953
Ping Sun,Wei Zhang,Binze Zou,Lincheng Zhou,Zhengfang Ye,Quanlin Zhao
Attapulgite (ATP) has a unique porous layered chain structure and is an excellent environment-friendly decolorizer. However, its high viscosity makes it difficult to separate. First, it was combined with magnetic Fe 3 O 4 nanoparticles to obtain Fe 3 O 4 -ATP that is easy to recycle and reuse. Then, Fe 3 O 4 -ATP nanoparticles were embedded in chitosan (CS) gel beads, and glutaraldehyde was used for cross-linking and curing. Lastly, ethylenediaminetetraacetic acid (EDTA) was successfully connected to Fe 3 O 4 -ATP/CS gel beads through amidation reaction, which further increased the capability of the adsorbent to adsorb heavy metal ions. The prepared magnetic composite adsorbent is a sphere with a rough surface and porous structure. The maximum adsorption capacity of the prepared Fe 3 O 4 -ATP/EDTA/CS adsorbent for Pb(II), Cu(II), and Ni(II) is 368.32, 267.94, and 220.31 mg g −1 , respectively. After 5 times of repeated use, Fe 3 O 4 -ATP/EDTA/CS still showed good adsorption capacity for Cu(II), Pb(II), and Ni(II). Fe 3 O 4 -ATP/EDTA/CS has a large adsorption capacity for heavy metal ions, a wide pH applicability, good reuse, and rapid magnetic separation. In addition, Cu(II) loaded Fe 3 O 4 -ATP/EDTA/CS also showed good catalytic degradation performance for bisphenol A. This study prepared a new type of adsorbent with good adsorption performance and provided a promising method for the treatment of wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2014
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IF 4.058
Lichun Fu,Fuqiang Liu,Yan Ma,Xuewen Tao,Chen Ling,Aimin Li,Chendong Shuang,Yan Li
Magnetic strongly basic anion exchange resin (MAEX) and weakly acidic cation exchange resin (MCEX) and their combined processes were employed to simultaneously remove such heavy metals (HMs) as Cu(II), Ni(II) and tannic acid (TA). Both MAEX and MCEX resins exhibited co-removal capability for Cu(II) and TA in binary solutions. Complexing-bridging was ascribed as the primary mechanism for the co-removal of TA and Cu(II) based on Density-Functional-Theory (DFT) calculation, fluorescence spectra, Fourier Transform Infrared Spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) characterization. Moreover, an interesting discovery was found that hydrogen bond interaction between both nitrogen atom of the secondary amine ( NH ) and oxygen atom of carbonyl (C O) with un-ionized TA, and quaternary ammonium ( N + (CH 3 ) 3 ) ion exchange with ionized TA were ascribed to the mechanism of TA adsorption onto MAEX. The novel integrative technique based on MAEX and MCEX mixed completely in the same reactor could simultaneously remove Cu(II), Ni(II) and TA with high efficiencies of 92.1%, 94.8% and 88.4%, respectively. Three adsorbates could be successfully recovered with 0.1 M NaOH followed by 0.01 M HCl solution. Given the stable application for five cycles, combined magnetic resin treatment showed great potential in simultaneous removal of Cu(II), Ni(II) and TA.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Zhike Wang,Ting-Ting Li,Hao-Kai Peng,Hai-Tao Ren,Ching-Wen Lou,Jia-Horng Lin
Hydrogels have extensively studied as adsorbents, raw materials for the preparation of adsorbent hydrogels have low strength, while high strength hydrogels have weak adsorption capacity. In this study, PVA hydrogel was crosslinked via trihydroxy melamine and epichlorohydrin, and β-cyclodextrin with strong adsorption capacity was added to remove the heavy metal ions . Results showed that the addition of trihydroxy melamine with 8%, the compressive strength of the hydrogel was increased by approximately 20%. The Langmuir isotherm model showed that the adsorption capacity of the hydrogel for Pb(II) and Ni(II) reached 505.9 mg/g and 286.7 mg/g, respectively, and the efficiency of removing the low-concentration heavy metal ions in water more than 99%. The hydrogel is low cost, and maintained highly removal efficiency under low pH. The removal efficiency of the hydrogel remained above 90% after five repeated adsorption-desorption experiments. The hydrogels have a potential to be used in wastewater treatment as adsorbents.
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Ting-Ting Li,Zhike Wang,Hai-Tao Ren,Hao-Kai Peng,Xiao Zhang,Qian Jiang,Ching-Wen Lou,Jia-Horng Lin
This study reports a novel adsorbent structure and shows the satisfactory removal performance of Pb(II) and Ni(II). The fabric structure increases the strength of the hydrogel. The hydrogel plays a major role in the composite structure as a matrix, while the fabric bears the applied load and protects the structure from mechanical damage. The double-network composite hydrogel is reinforced by plasma grafted polylactic acid melt-blown non-woven fabric and polyethylene glycol dimaleate, and its compressive strength reaches 40.6 kPa at 60% strain. The interface substantially improves the compression strength by 42.9%. Through the adsorption isotherm model, the adsorption capacity of the hydrogel for Pb(II) and Ni(II) reaches 233.12 and 165.06 mg/g, respectively, and the removal rate of heavy metal ions in water at low concentrations exceeds 95%, showing the excellent removal rate of heavy metals. Even after the fifth cycle, the removal efficiency barely declines, indicating the feasibility of repeatedly use. Cost analysis reveals that the adsorbent is relatively low cost, solving the problems of difficult recovery, low strength, and easy damage of hydrogel adsorbents, and promoting the industrial application of hydrogels as adsorbents.
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PubMed
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CHEMOSPHERE
·
2019
·
IF 5.108
Huajing Zhou,Jun Luo,Yuancai Chen
Ethylenediaminetetraacetic acid (EDTA) could form stable complexes with toxic metals such as nickel due to its strong chelation. In this study, with the same doping level of Co and N, MoO 2 and ZIF-67 were used as precursors to prepare MoO 2 @Co/N and FeC@Co/N electrocatalysts for the modified graphite felt cathodes in heterogeneous-electro-Fenton-like reaction (HEFL) system. The X-ray diffraction and X-ray photoelectron spectroscopy results indicated that both of the catalysts are dominated with pyridinic N (2.42% and 2.82%) upon co-doping Co/N, and FeC@Co/N exhibited an obviously higher additional sp -hybridized nitrogen ( sp -N) peak. The co-doping of Co/N induced the lattice modifications to produce more lattice defects, where pyridinic N and sp -N, related with the active sites (C–N, Co-Nx), were formed at near-ring defects along sheet edges through the nitrogen replacement of C C groups. FeC@Co/N demonstrated superior oxygen reduction reaction catalytic activity in terms of Cyclic Voltammetry and Rotating Ring-disk Electrode, and exhibited the remarkably higher current density (30 mA) and lower onset potential (−0.208 V) in Linear Sweep Voltammetry analysis. In the FeC@Co/N/CF modified HEFL system, despite the generated H 2 O 2 concentrations (62.5 mg L −1 ) is not very high, the reducing reaction of ≡Fe(III)/Co(III)–OH could get the electron directly from the cathode, which would greatly reduce the consumption of H 2 O 2, high utilization efficiency of H 2 O 2 (η: 87.63%) could greatly improve the EDTA-Ni removal (97.5%) and TOC (92.6%). This work demonstrates the feasibility of utilizing FeC@Co/N/CF as a cathode for breaking metal-complex in HEFL process.
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ORGANOMETALLICS
·
2024
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IF 2.5
Hong Chen,Weiwei Zuo
Asymmetric transfer hydrogenation (ATH) of ketones is an efficient method for constructing chiral alcohols that are widely used in synthesizing various fine chemicals. Currently, most of the existing catalysts contain precious metals that are highly toxic and scarce, which limits industrial application and sustainability. Therefore, the development of catalysts based on earth-abundant and environmentally friendly 3d metals is an important research topic. We previously reported that amido-ene(amido)diphosphine Ni(II) catalysts exhibited promising reactivities. However, the enantioselectivity of the catalytic system was not satisfactory. Here, we report (primary amido)-ene(amido)Ni(II)diphosphine catalyst 2n containing a P-chirogenic substituted ferrocene moiety in the ligand backbone and its analogue (2m). 2n was used for ATHs of a range of ketones with improved enantioselectivity, affording secondary alcohols of the (S)-configuration with up to 98% enantiomeric excess (e.e.). Computational results indicated that in the reaction system of catalyst 2n, the (S)-configuration of the phosphine kept the (S)-planar chiral ferrocene moiety far from the reacting site in the transition state that produced the (S)-configured alcohol. This created space for the aryl ring of the substrate and the ene(amido) moiety of the catalyst to approach each other and form a strong π–π interaction that enhanced the enantioselectivity.
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RSC Advances
·
2019
·Vol. 9
·期 67
·39037-39045
·
IF 3.049
Xin Min
In this study, novel hydroxyl-terminated polybutadiene (HTPB) with a high cis-1,4 content was developed using a tert-butyl dimethyl siloxy dimethyl propyl lithium (Li)–naphthenate nickel (Ni)–boron trifluoride (B) initiating system (Li–Ni–B). The effects of the material ratio and the addition sequence on the cis-1,4 content and molecular weight of HTPB were studied, and the results were discussed. The optimal Li/Ni ratio was 10 : 1, and the optimal Li/B ratio was 1 : 2. HTPB prepared by the Li–Ni–B system was characterized by Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H-NMR) spectroscopy, and 13C nuclear magnetic resonance (13C-NMR) spectroscopy. The results suggested high cis-1,4 contents in HTPB synthesized using Li–Ni–B (cis-1,4 > 95%). The comparison of the cis-1,4 contents in the HTPB samples obtained by anionic polymerization and the Li–Ni–B system revealed the advantages of the latter compared to the former.
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RSC Advances
·
2022
·Vol. 12
·期 53
·34571-34583
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IF 4.036
Weiye Zhang,Xiujun Deng,Siqing Ye,Yan Xia,Lingling Li,Weili Li,Hongxing He
It is significant to selectively remove Ni(II) ions from wastewater. A novel sulfonic acid-based magnetic rattle-type ion-imprinted polymer (Fe3O4@void@IIP-Ni(II)) was designed by taking advantage of the strong interaction between Ni(II) and sulfonic acid groups. Green polymerization was used to synthesize Fe3O4@void@IIP-Ni(II), which was then investigated using SEM, TEM, FT-IR, VSM, TGA, EDS, and XPS. The adsorption results indicated that the prepared imprinted material had a short adsorption equilibrium time (10 min), good magnetic responsiveness (about 5 seconds) and high adsorption capacity (44.64 mg g−1) for Ni(II) at the optimal pH of 6.0. The removal rate of Ni(II) was up to 99.97%, and the adsorption process was spontaneous and endothermic, following the pseudo-secondary kinetic model and Langmuir model. The selectivity coefficients of the imprinted material were 4.67, 4.62, 8.94 and 9.69 for Ni(II)/Co(II), Ni(II)/Cu(II), Ni(II)/Pb(II) and Ni(II)/Zn(II), respectively. The regeneration and application of the imprinted material in actual water samples have been verified. Moreover, the mechanism of selective adsorption for Ni(II) was investigated by FTIR, XPS and density functional theory (DFT) calculation. The results showed that the imprinted sorbent has a strong binding ability with Ni(II), and the adsorption of Ni(II) on Fe3O4@void@IIP-Ni(II) was the result of the co-coordination of O atoms of the sulfonic acid groups and N atoms of –N–CO groups in AMPS with Ni(II).
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 2
·497-506
·
IF 2.482
Gao Xiaoxia,Wang Jiang,Xu Aiju,Jia Meilin
4Ni–Al layered double hydroxide (LDH) precursors were prepared by the following three methods: constant pH coprecipitation, variable pH coprecipitation and urea hydrolysis. The 4Ni–Al mixed metal oxide (MMO) catalysts were obtained by the calcination of LDH precursors at 600 °C, and their catalytic performances in ODHP from 350 to 550 °C were tested. The 4Ni–Al MMO from the urea hydrolysis method showed a higher and more stable propylene selectivity of ca. 40% with propylene yield of ca.11% at 500 °C, and that from the constant pH coprecipitation method was followed, while oxidative cracking of propane occurred on the 4Ni–Al MMO from the variable pH coprecipitation method. It is considered to be closely related to the dispersion and stability of the surface Ni(II) species through comprehensive analysis of XRD, N 2 -adsorption-desorption, TEM, XPS, H 2 -TPR and In-situ electrical conductivity. The urea hydrolysis method with a low salt concentration, leading to an excellent stability of the surface Ni(II) species at high reaction temperature, should be selected to prepare Ni–Al MMO catalysts for ODHP instead of the traditional variable pH coprecipitation method with a high salt concentration. Graphic
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hanbang Liu,Liping Yang,Danhua Yuan,Guangye Liu,Jiacheng Xing,Yunpeng Xu,Zhongmin Liu
For air separation, the separation method relying on adsorbents has attracted wide attention as a low energy consumption process, and the development of O 2 -selective adsorbents is of great significance. Metal-organic frameworks with coordinatively unsaturated transition metal sites have great potential in O 2 -selective adsorption, but most of them cannot be completely regenerated at ambient temperature or can only be effective at very low temperatures. Herein, we report two mixed-ligand metal–organic framework adsorbents [M(AIP)(BPY) 0.5 ·H 2 O] n ·2nH 2 O with coordinatively unsaturated cobalt(II) and nickel(II) sites, which can preferentially adsorb O 2 versus N 2 , and their IAST O 2 /N 2 selectivities are both significantly greater than 1 at 25 °C. These materials exhibited excellent stability and had no loss of adsorption capacities even after immersion in water for 7 days. More importantly, O 2 adsorption–desorption cycle experiments showed that these adsorbents can be completely regenerated at ambient temperature after adsorbing O 2 , and the breakthrough experiments further confirmed their dynamic O 2 /N 2 separation potential and regeneration ability. The results of theoretical calculations suggested that the interactions between adsorbents and O 2 are stronger than those of N 2 , and they have relatively obvious differences in the N 2 and O 2 interaction energies. This work provides inspirations for searching for metal–organic frameworks that can selectively adsorb O 2 at ambient temperature.
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