JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Yong-Qiang Chen,Yuan Tian,Na Li,Sui-Jun Liu
Two isomorphous metal-organic frameworks (MOFs) {[M 2 ( μ 3 -OH)(trz)(sdba)(H 2 O)]·3H 2 O} ∞ (M = Ni for 1 , Zn for 2 , Htrz = 1,2,4-triazole, H 2 sdba = 4,4′-sulfonyldibenzoate) were obtained under the same reaction condition. Both of complexes present a three dimensional 8- c framework with whc1 topology based on M 4 -( μ 3 -OH) units. Moreover, the magnetic properties of 1 and anion sensing of 2 were investigated. The magnetic study show that the domain antiferromagnetic interactions exist in 1 . However, complex 2 can be considered as a promising chemical sensor for detecting PO 4 3¯ by means of fluorescence enhancement among various anions in aqueous solutions.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yuzhu Xue,Weinan Wang,Yanhong Zhang,Qinhua Fan,Ying Zhang,Chen Ling,Yuwei Pan
This study proposes a green purification strategy in which mild decomplexation of Ni-EDTA into other Ni complexes facilitates the efficient removal and recovery of nickel through resin adsorption. Decomplexation of Ni-EDTA by boron/Fe 2+ /H 2 O 2 (B/Fe 2+ /H 2 O 2 ) followed by resins adsorption was conducted for Ni(II) removal in Ni-EDTA. The Ni(II) removal efficiency could only achieve 1.3 % and 6.2 % while Ni(II) coexisted with EDTA but more than 10 times of higher when Ni(II) coexisted with EDTA-relatives via the single adsorption of commercial heavy metal-affined resins (D001 and D463), which attributed to the increased binding energies of these Ni-EDTA’s degradation products complexes than Ni-EDTA based on density functional theory (DFT) calculation. In comparing to precipitation, the resin adsorption required much less mineralization of EDTA to have a better removal efficiency of Ni(II). B improved the efficiency of Ni-EDTA decompexation by accelerating the recycle of Fe 3+ /Fe 2+ . The EDTA (and TOC) removal enhanced from 48.7 % (4.7 %) to 94.7 % (11.9 %) by B/Fe 2+ /H 2 O 2 process comparing to Fe 2+ /H 2 O 2 process. With the high EDTA but low TOC removal efficiency after B/Fe 2+ /H 2 O 2 treatment, Ni(II) removal efficiency via resins adsorption could maximum achieve 80.5 %, 2–3 times of that via regular precipitation method. In addition, B and resins exhibited good reusability in five cycles, and B/Fe 2+ /H 2 O 2 -resins process had excellent adaptability to different heavy metal complexes. B/Fe 2+ /H 2 O 2 -D463 system not only could reduce 78.4 % reagents cost compared with that of Fe 2+ /H 2 O 2 -precipitation process, but also could save much cost than other processes. The results provide new insights for the cost-effective treatment of EDTA-complexed heavy metal wastewater.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Zhao Jingru,Wei Zifei,Sun Linan,Wang Ying,Wu Xiaodan,Wang Tao,Wang Zihan,Fu Yujie
Heavy metal ions contain highly toxic and non-biodegradable wastewater pollutants seriously contaminating the environment and affecting human health. Removal of heavy metal ions from the environment is a vital step towards the elimination of water pollution on a global scale. Therefore, in this study, cellulose was modified with L-cysteine, sodium alginate and polyethyleneimine to produce cellulose/sodium alginate /polyethyleneimine/L-cysteine composite hydrogel microspheres (WCMs/SA/PEI/L-Cys) in order to efficiently adsorb heavy metal ions. Co(II) and Ni(II) are successfully removed from water. After their production, the sorbents underwent examination using X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy (FT-IR), and Scanning electron microscopy (SEM). In addition, the investigation of the mechanism and adsorption characteristics of cellulose-modified gel microspheres WCMs/SA/PEI/L-Cys has been completed. The majority of the adsorption of contaminants by cellulose-modified gel microspheres WCMs/SA/PEI/L-Cys adhered to the Langmuir isothermal adsorption model and quasi-secondary kinetic model. The intra-particle diffusion model was adopted for improving the fitting of the adsorption process in the materials. It was indicated that the internal and external diffusion acted together to eliminate the contaminants from the materials. When exploring the decontamination mechanism of the materials using XPS, it was shown that the functional groups containing nitrogen, oxygen and sulfur play a key role in removing contaminants. For Co(II) and Ni(II), the highest adsorption capacities of the sorbent were 358 and 373 mg/g, respectively. The material exhibited robust stability and recyclability based on the regeneration experiment results, remaining stable after six adsorption cycles and retaining over 80% of the initial adsorption amount.
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MICROCHIMICA ACTA
·
2011
·Vol. 174
·期 3
·289-294
·
IF 2.578
Sun Jun-Yong,Huang Ke-Jing,Fan Yang,Wu Zhi-Wei,Li Dan-Dan
We present a modified glassy carbon electrode as a sensing platform for glucose. It is based on a composite film prepared from Ni(II) ion, quercetin and graphene. The sensor was characterized by cyclic voltammetry. The electron transfer coefficient, reaction rate constant and catalytic rate constant were determined and found to be 0.53, 5.4 s −1 and 2.93 × 10 3 M −1 s −1 , respectively. The catalytic current depends linearly on the concentration of glucose in the range from 3 to 900 μM, with a detection limit of 0.5 μM (at an S/R of 3). The sensor exhibits good reproducibility, stability, fast response, and high sensitivity.
Cyclic voltammograms of Ni(II)-Qu/Gr/GCE in 0.1 M NaOH solution at various scan rates (from inner to outer): 0.02, 0.04, 0.06, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 V·s −1 . Plot of I
p versus υ 1/2 and E
p versus logυ.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Shuai Tang,Lujian Lin,Xuesong Wang,Anqi Yu,Xuan Sun
In water environments, nylon microplastics (MPs) and heavy metals are two kinds of common pollutants. This study investigated the adsorption of three divalent metals (Cu(II), Ni(II), Zn(II)) onto collected nylon MPs as function of contact time, temperature, solution pH, ionic strength and concentration of fulvic acid (FA). The kinetic data fitted well with the Elovich and pseudo-second order equations. The result of shrinking core model (SCM) confirms that the adsorption of Cu(II) and Zn(II) was mainly controlled by intraparticle diffusion. The adsorption of three metal ions onto collected nylon MPs is spontaneous, endothermic, with an increased randomness in nature. The Langmuir and Freundlich models successfully described the adsorption isotherms. The speciation distributions of three divalent metals in aqueous solutions were identified to analyze the effects of initial solution pH, ionic strength and fulvic acid concentrations on the adsorption amounts. X-ray photoelectron spectroscopy (XPS) analysis indicates the importance of surface O-containing groups of collected nylon MPs in controlling the adsorption of three metal ions. This research provides a clear theoretical basis for the behavior of nylon MPs as heavy metals (Cu(II), Ni(II), Zn(II)) carrier and highlights their environmental toxicity, which deserves to be further concerned.
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CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2023
·Vol. 36
·期 1
·57-65
·
IF 1
Wang Shen-hao,Muhammad Muhammad,Huang Qing
It is important to identify non-planar deformations of porphyrin macrocycle in metallo-porphyrin proteins due to their functional relevance. The relationship between non-planar deformations of porphyrin macrocycle and low frequency Raman spectral bands of Ni(II) meso-tetraphenyl porphyrin (NiTPP), with different coordination numbers, was studied by density functional theory (DFT), normal coordinate structural decomposition method and Raman experiments. The results show that the crystal of four-coordinate NiTPP has two major kinds of non-planar deformations: ruffling and saddling. The non-planar deformations of ruffling and saddling for NiTPP are 1.473 Å and 0.493 Å determined by DFT calculation. The ruffling and saddling deformations can be identified by using the low frequency Raman characteristic peaks ( γ 12 , γ 13 ) and ( γ 16 , γ 17 ), respectively. When four-coordinate NiTPP is transformed to the six-coordinate bis(pyrrolidine) NiTPP (NiTPP(Pyr) 2 ), the large non-planar distortion of the porphyrin macrocycle almost disappears, with the non-planar deformation of saddling only about 0.213 Å estimated by DFT calculation. Experimentally, we can make use of the characteristic peaks of low frequency Raman spectra to identify the saddling deformation beyond 0.25 Å.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Zhiqiang Guo,Rui Chen,Rongrong Yang,Fanjun Yang,Jun Chen,Yuan Li,Ru Zhou,Jinzhang Xu
Novel amino-modified rice bran biochar/MgFeAlO 4 (RB@MgFeAlO 4 -NH 2 ) magnetic composites were synthesized via a simple one-step solvothermal approach and applied for removing toxic Ni(II) from wastewater. The elimination process and sorption performance of Ni(II) on RB@MgFeAlO 4 -NH 2 were analyzed by combining batch experiments and spectral techniques. The sorption isotherms and kinetic data indicated that Ni(II) sorption on RB@MgFeAlO 4 -NH 2 was monolayer and rapid. The experimental results confirmed that the obtained RB@MgFeAlO 4 -NH 2 magnetic composite had high sorption capacity for Ni(II). The maximum sorption capacity of Ni(II) on RB@MgFeAlO 4 -NH 2 was 201.62 mg g −1 . The researches based on the sorption mechanism showed that the ion exchange mechanism accounted for 76.51% of Ni(II) sorption. In addition, the amino, carboxyl and hydroxyl functional groups were also involved in the complexation with Ni(II). In view of its multiple advantages of environmental friendliness, low cost, easy magnetic separation and high sorption capacity, RB@MgFeAlO 4 -NH 2 will be an excellent adsorbent for low-cost and efficient elimination of Ni(II) from aqueous solutions.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Chen Ling,Zixi Ren,Mengmeng Wei,Fei Tong,Yuwei Cheng,Xiaopeng Zhang,Fuqiang Liu
Inorganic complexants, such as ammonia (AA) and pyrophosphate (PP), are often present alongside heavy metal ions in alkaline plating rinsing wastewater. We investigated the removal capacity of Ni(II) from waters containing [Ni-xNH 3 -yP 2 O 7 ] n complexes by chelating and ion-exchange resins in sole and dual-ligand systems. D463 (containing iminodiacetic groups) and PAMD (possessing polyamine groups) exerted superior performance under all conditions. Ni(II) adsorption on D463 decreased with AA and PP by 10.3% and 64.4%, respectively. Conversely, the adsorption on PAMD increased by 57.3% and 75.8%, respectively. PAMD exhibited high selectivity toward anionic [Ni-PP] species over free PP. More Ni(II) was captured by PAMD in the dual-ligand systems than sole systems, while the case for D463 was opposite. As confirmed by species tracking and DFT/XPS analyses, complexes breaking-Ni 2+ capture was the dominant mechanism for D463, while the dual-site (non-charged and protonated amines) interactions with NiP 2 O 7 2– on PAMD promoted its adsorption. The tandem combination D463-PAMD was the optimal mode to remove the most Ni(II). The actual wastewater test demonstrated that >210 BV effluent met the limit of 0.1 mg Ni(II)/L and the eluent contained 15 g Ni(II)/L. This study guides the application of chelating adsorption processes in the advanced treatment of plating rinsing wastewaters.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Umer Hayat,Shafuq Abbas,Qingcai Yu,Yifan Chai,Defeng Kong,Xinyang Huang,Xing Chen
Nowadays, heavy metals are a major issue worldwide, polluting natural resources. In the given study, a novel approach was developed; commercial coconut shell activated carbon was modified with Fe 3 O 4 and thiourea (CH 4 N 2 S) to adsorb Cr(VI) and Ni(II) from industrial wastewater under photochemical reaction on a signal platform. The Cr(VI) reduction-adsorption rate was approximately 95% (2.91 mg/L), which was investigated under acidic conditions (pH = 2) with a 40 mg dose of adsorbent. The same phenomenon was observed for Ni(II) adsorption, approximately 91% (3.98 mg/L) at pH = 6 for 60 min, using the same adsorbent dose. The increased removal efficiency is attributed to the synergetic behavior of Fe₃O₄ and thiourea, where the Fe₃O₄ endorsed the reduction-adsorption of Cr(VI) while thiourea functional groups ( NH₂ and C S) endorsed the adsorption of Ni(II) with strong coordination of active sites along with surface complexation and electrostatic interactions. Analysis indicated the breakage of the activated carbon structure after the Cr(VI) adsorption. To get insights into the adsorption mechanism, Density Functional Theory calculations were performed to optimize structure, showing the stability of metal and surface complexes. FMO analysis demonstrates a reduction in the HOMO-LUMO energy gap from 2.95 eV (CSAC) to 0.17 eV (CSAC@Fe₃O₄@TU & metal), indicating increased surface reactivity and charge transfer. While NCI and RDG calculations further confirm the electrostatic attraction and bonding of Cr(VI) and Ni(II). This study presents a novel approach to conducting comparative studies under photochemical reactions. The CSAC@Fe 3 O 4 @Tu is a low-cost, green catalyst that was used for the remediation of environmental pollutants.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 6
·1492-1500
·
IF 1.174
Zhang Nan,Fan Yu-Hua,Bi Cai-Feng,Zhang Xia,Zhang Peng-Fei,Zhang Zhong-Yu,Li Xin
Three novel transition metal coordination polymers, [Ni(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 1 ), [Zn(C 18 H 16 N 3 O 2 ) 2 ·4CH 3 OH]
n
( 2 ) and [Cd(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 3 ) (C 18 H 16 N 3 O 2 =2-acetylpyridine- d -tryptophan) were synthesized and characterized by elemental analysis, IR, UV, 1 H NMR and X-ray diffraction single crystal analysis. The analyses of the structures indicate that all three materials crystallize in the tetragonal crystal system, space group P 4 1 2 1 2. They have similar structures; i.e., the Schiff base coordinates in its deprotonated form and behaves as a hexadentate (4N+2O) coordinated ligand to form a distorted octahedron geometry. On the other hand, as a result of the alternate arrangement of chains through N–H···O intermolecular hydrogen bonds interactions, 2-D layers are formed for the three complexes. Furthermore, the luminescent properties and thermal stabilities of the three complexes were investigated.
研究领域:
无机化学
·
配位化学
·
材料化学
·
晶体工程
·
光物理化学
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Jianming Wu,Xi Cheng,Guisheng Yang
In this study, nanochitin-contained magnetic chitosan (FPCC) microfibers were prepared successfully via continuous injection gelation method and employed to remove Ni(II) ion from aqueous solution. Firstly, Fe 3 O 4 -nanoparticles were encapsulated into ε-caprolactam (CL) monomer solution in the presence of polystyrene (PSE), followed by CL anionic ring-opening polymerization and PSE removal, and obtained magnetic polyamide 6 (PA 6) microparticles (FP). After that, the economical FPCC microfibers can be prepared by adding FP microparticles and nanochitin (n-CT) into poly(vinyl alcohol)/chitosan hybrids (PVA/CTS). The obtained FPCC microfibers had shown significant advantages in production, separation, and adsorption when compared to the hydrogel beads prepared by the traditional method (instantaneous gelation method). Within 10 h, 99.7% Ni(II) could be adsorbed by FPCC magnetic microfibers (adsorbent dosage: 1 g, pH: 4.1, and temperature: 293 K). More attractively, the hybridized microfibers could be easily separated from the aqueous solution through a magnetic separation method after Ni(II) adsorption. Ni(II) adsorption behaviors of the hybrid microfibers conform to the Langmuir isotherm model and pseudo-second-order kinetic model. Besides, the possible adsorption mechanism was also discussed.
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RSC Advances
·
2016
·Vol. 6
·期 25
·20542-20550
·
IF 3.289
Renjie Li,Lifen Liu,Yuehua Zhang,Fenglin Yang
In this paper, nanoscale MnO2 particles were attached onto the surface of a PVDF flat sheet membrane, step by step, first through dispersion of graphene oxide (GO) in the PVDF membrane, then reduction of immobilized GO by hydroiodic acid and further micro-wave assisted oxidation of RGO (reduced graphene oxide) by KMnO4 and formation of MnO2 on GO. The SEM observation revealed an asymmetric structure with a finger-like transition layer dominating the membrane of PVDF/MnO2. The uniform distribution of MnO2 on the membrane is revealed by EDX and XPS analysis. The attached MnO2 endowed the membrane with high adsorption capacity for aqueous Ni(II). The adsorption was spontaneous and endothermic, fitting a pseudo-first-order kinetic model and Freundlich isotherm model well. The pure water flux and stable permeation flux of the PVDF/MnO2 membrane reached 31.2 L m−2 h−1 and 9.0 L m−2 h−1 under 0.1 MPa, which were 2.3 and 2.6 times those of the PVDF membrane. The analysis of the fouling resistance and flux recovery ratio indicated that the PVDF/MnO2 membrane had better antifouling properties than the PVDF membrane, attributed to the changes of membrane morphologies and surface hydrophilicity. The PVDF/MnO2 membrane had a high removal ratio (≥87.4%) of Ni2+ in dynamic adsorption. Meanwhile the Ni(II) adsorbed membrane could be easily regenerated by a 0.1 M HNO3 solution.
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