APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 40
·期 1
·e70473
·
IF 0
Fuhua Wei,Anhui Huang,Qinhui Ren,Min Li,Wei Shang,Diaodiao Zhang,Zhao Liang
In this research, GO/Cu/Cr-MOF composites were fabricated via a dissolution-heat method. The GO/Cu/Cr-MOF composite was characterized using FT-IR, SEM, XRD, and EDS techniques. The characterization results confirmed the presence of Cu and Cr metallic elements in the composite, and FT-IR analysis demonstrated that the organic ligands were successfully coordinated with the metal centers. The characterized GO/Cu/Cr-MOF composite was employed in the removal study of fleroxacin and levofloxacin. The results demonstrate that the addition of 40 mg of the composite to a 40-ppm levofloxacin solution achieved a removal efficiency of 95.9% within 5 h. Likewise, adding the same amount of composite to a 20-ppm fleroxacin solution resulted in a maximum removal efficiency of 98.2% over the same time period. The experimental data were examined using both the kinetic model and the isotherm models. The results revealed that the adsorption of both antibiotics onto the GO/Cu/Cr-MOF composite followed the pseudo-second-order kinetic model and was most accurately represented by the Langmuir isotherm. The experimental results indicate that the adsorption capacity of the GO/Cu/Cr-MOF composite for fleroxacin and levofloxacin reaches its maximum within the pH range of 6 and 8.
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产品关联
DOI
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 10
·1568-1580
·
IF 4.5
Sun Nan,Wu Qing,Jin Lifang,Zhu Zichen,Sun Jianhui,Dong Shuying,Xie Haijiao,Zhang Chunyan,Cui Yanrui
By using a two-step hydrothermal method and trithiocyanuric acid (TTCA), 2,4,6-trihydrazino-1,3,5-triazine (THT), and Fe 3 O 4 as raw materials, a spherical magnetic adsorbent polymer (TTCA/THT@Fe 3 O 4 ) was synthesized to achieve the efficient removal of Cr(VI) from wastewater. Under optimal adsorption conditions, the maximum adsorption capacity of TTCA/THT@Fe 3 O 4 for Cr(VI) can reach 1340 mg·g −1 . Notably, the removal efficiency can approach 98.9%, even at the lower concentration of 20 mg·L −1 Cr(VI). For actual wastewater containing Cr(VI), the Cr(VI) concentration was reduced from 25.8 to 0.4 mg·L −1 , a remarkable 20% lower than the current industry discharge standard value. A mechanism for the high adsorption performance of Cr(VI) on TTCA/THT@Fe 3 O 4 was investigated using Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and density functional theory. It can be plausibly attributed to the formation of Cr/N and Cr/S coordination bonds. Additionally, surface electrostatic adsorption, reduction effects, and the spherical polymer structure increase the contact area with Cr(VI), maximizing adsorption. The synergistic effect of adsorption and reduction enhances the adsorption performance of TTCA/THT@Fe 3 O 4 for Cr(VI) and total chromium in water. The resultant polymer has a simple preparation process, excellent adsorption performance, easy magnetic separation, and promising application for actual wastewater.
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Yinghua Li,Yue Zhang,Fei Su,Yiyan Wang,Linlin Peng,Deze Liu
As the important carriers of environmental pollutants, microplastics have a significant impact on the migration, transformation and toxicology of heavy metals . In this paper, the adsorption behavior of Cr(VI) on PE/PS/PA microplastics under UV irradiation was studied. The research results show that the adsorption capacity of original PA is the strongest, followed by PS and PE . The specific surface area of the aged microplastics increased and new functional groups were formed, so the adsorption of three microplastics for Cr(VI) was stronger than that before aging. The average saturation adsorption of Cr(VI) by PA/PS/PE increased respectively from 730.69 μg/g, 146.11 μg/g and 75.61 μg/g to 736.31 μg/g, 318.75 μg/g and 136.78 μg/g. The Langmuir and Freundlich models showed that the adsorption is more consistent with the Freundlich model, indicating that adsorption is mainly based on multi-molecular layer adsorption on non-homogeneous surfaces. In the Cu–Cr polluted water, Cu has different effects on the adsorption behavior. Cu can promote the adsorption of Cr(VI) by PE and PS , while inhibited the adsorption by PA . In addition, environmental conditions such as temperature, pH and dissolved organic matter also have significant effects on adsorption behavior. Mechanistic analysis confirmed that electrostatic interaction plays an important role. Secondly, based on the surface physicochemical properties of the microplastics, surface complexation and van der Waals forces also significantly enhance the adsorption of Cr(VI) on the aged microplastics.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Yanxue Yue,Weiyu Zhu,Alhadi Ishag,Bo Zhang,Yubing Sun
The natural clay mineral was activated using the acid treatment under ultrasonic conditions to improve its adsorption performance. The acid-activated clay (AAC) was investigated to remove Cr(VI) from wasted lubricant and U(VI) from aqueous solution by batch, spectroscopy, and modeling. Batch experiments showed that the isotherms and adsorption kinetics of Cr(VI)/U(VI) on AAC were satisfactorily followed by Frenudlich and the pseudo-second-order model, respectively. The decreased adsorption of U(VI) on AAC with the increase of ion strength indicated the outer surface complexation of U(VI) on AAC. The interaction mechanism of Cr(VI)/U(VI) on AAC was demonstrated to be surface complexation by oxygenated functional groups (e.g., hydroxyl) according to X-ray photoelectron spectroscopy (XPS) analysis. According to fitting of surface complexation models using three approaches, the adsorption of U(VI) on AAC at different pH can be better fitted by the double-layer model compared to the constant-capacitance model and triple-layer model. These findings are great important for the application of acid activated clay in the removal of heavy metals and radionuclides from the environment.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 8
·11028-11042
·
IF 2.478
Tang Ping,Cao Ming,Yu Jian,Wang Lifang,Zhang Deqin
Bi 1− x Ba x Fe 1− y Cr y O 3 (BBFCO: x = 0, y = 0; x = 0.05, y = 0; x = 0, y = 0.05; x = 0.05, y = 0.05; x = 0.1, y = 0; x = 0, y = 0.1; x = 0.1, y = 0.1; x = 0.2, y = 0) nanoparticles were prepared by a simple cost effective ethylene glycol-based sol–gel technique. The calcination temperature was set at 600 °C for 120 min with a heating rate of 10 °C/min. Effects of Ba, Cr dopant on structural, optical and magnetic properties of BiFeO 3 (BFO) nanoparticles have been studied. Perovskite structure was confirmed by the metal-oxide absorption bands appeared at 559 cm −1 and 438 cm −1 in Fourier-transform infrared spectroscopy spectra, which are the characteristic bands of FeO 6 octahedral groups in perovskite structure. X-ray diffraction patterns confirmed that Barium (Ba) is an effective dopant to suppress the impurity phases in Cr-doped BFO. Phase transitions from rhombohedral to orthorhombic phase in all doped samples were verified by Rietveld refinement and Raman analysis. Rhombohedral, orthorhombic and tetragonal phases coexist in Bi 0.9 Ba 0.1 FeO 3 and Bi 0.8 Ba 0.2 FeO 3 , which can be ascribed to the serious lattice distortion due to high-level Ba doping. Well-crystalline BBFCO nanoparticles were observed and the particle size distribution of all samples was calculated from transmission electron microscope images. Ba–Cr co-doping resulted in a dramatic reduction in the particle size. Optical absorption spectra indicated that the optical bandgaps of the doped samples are about 2.20 eV. Clear hysteresis loops were observed in all doped BFO, which indicate their ferromagnetic order at room temperature. Gradually enhanced ferromagnetic property was realized in Ba-doped BFO. The magnetization (at 20 kOe) of BFO, BFO-5Ba, BFO-10Ba and BFO-20Ba are 0.24, 0.33, 1.00 and 1.25 emu/g, respectively. The remanent magnetization of them are near zero, 0.08, 0.44 and 0.53 emu/g, respectively. Particular shape of wasp-waist hysteresis loops observed in BFO-5Ba, BFO-5Cr and BFO-5BaCr can be ascribed to the coexistence of different magnetic phases, and the mixture of single domain and superparamagnetic particles.
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2020
·Vol. 231
·期 2
·1-12
·
IF 1.9
Zeng Ganning,Hong Chunxian,Zhang Yan,You Hanzhang,Shi Wenyue,Du Mingming,Ai Ning,Chen Bing
A novel polymer/activated carbon composite was prepared in this study by one-step chemical activation of Sargassum horneri , followed by surface modification with chitosan, a widely abundant biopolymer. The prepared composite was used as adsorbent to remove one of the most toxic metal ions, Cr(VI), from aqueous solution. Surface characterization tests revealed the material to be predominantly mesoporous with the specific surface area of 293.4 m 2 ·g −1 and the average pore diameter of 6.27 nm. Enhanced uptake capacity of Cr(VI) by the prepared composite was obtained due to the presence of more metal-binding functional (amino and hydroxyl) groups on its surface. Extremely fast adsorption rate of Cr(VI) was also achieved due to the porous structure of the prepared composite. This study has clearly shown that Sargassum horneri can be a potential alternative precursor for carbon-based adsorbents and the proper designed polymer/AC composites can be tailor-made adsorbents for heavy metal removal.
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DOI
高影响因子
POLYMER COMPOSITES
·
2016
·Vol. 39
·期 5
·1507-1513
·
IF 2.004
Xin Tuo,Bingrui Li,Xianghua Yu,Changlian Chen,Zhiliang Huang,Hong Cao,Yineng Huang,Liang Li
The magnetic polypyrrole (PPy) composite nanofibers are prepared in a simple one-pot method via in situ chemical polymerization of pyrrole in the presence of methyl orange, followed by the treatment of ammonia solution. The effect of methyl orange (MO) on the morphology of the magnetic PPy nanocomposites was investigated. The composite nanofibers were used as an efficient adsorbent to remove Cr(VI) from aqueous solutions. Moreover, because of the magnetic Fe 3 O 4 nanoparticles in the composites, it is easy for the composites to be separated from waste water by external magnet. These composites with hierarchical structures are expected to be a potential candidate for water treatment. POLYM. COMPOS., 39:1507–1513, 2018. © 2016 Society of Plastics Engineers
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Yuxuan Zhang,Jun Luo,Xiuyan Wang,Dunhan Zhang,Hongxia Xu,Yuanyuan Sun,Xueyuan Gu,Xin Hu,Bin Gao,Hongqiang Ren
MXenes, such as Ti 3 C 2 T x , demonstrate tremendous potential as heavy metal adsorbents due to their abundant reaction sites, high hydrophilicity , controllable interlayer spacing, and inherent reduction ability. However, their structural dependent pollutant removal performances and the related mechanisms are far less studied. Therefore, the removing abilities of Cr(VI) from water on Ti 3 C 2 T x MXenes with different structures (multilayer (ML-) and delaminated (DL-) Ti 3 C 2 T x ) synthesized via several etching techniques were evaluated. Focusing on the most effective ML- and DL-Ti 3 C 2 T x obtained by acid/fluoride salt etching, the impacts of structural variations on the Cr(VI) removal performances were explored. Both ML- and DL-Ti 3 C 2 T x demonstrate outstanding Cr(VI) adsorption and reduction capabilities, achieving equilibrium within 500 min with capacities of 92.7 and 205 mg/g, respectively. The differences in removal mechanisms stemed from the varying adsorption and reduction capacities of two MXenes. ML-Ti 3 C 2 T x , with lower surface area and porosity, had low adsorption capacity but superior reduction ability, efficiently converting most Cr(VI) to Cr(III) (66.8%). Conversely, DL-Ti 3 C 2 T x exhibited better removal efficiency but a lower capacity for reduction (45.7%). Notably, although the partial reduction of DL-Ti 3 C 2 T x to TiO 2 results in its limited chemical reduction capacity, Ti 3 C 2 T x might serve as a co-catalyst for TiO 2 , boosting the photoresponsiveness of DL-Ti 3 C 2 T x or TiO 2 through Ti 3 C 2 T x /TiO 2 heterojunctions , thereby facilitating photocatalysis to realize the reduction of Cr(VI). Both Ti 3 C 2 T x exhibited both excellent Cr(VI) removal capacity and detoxification capacity, demonstrating their high potential in treating heavy metal pollutants in wastewater.
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yongjun Sun,Aowen Chen,Wenquan Sun,Kinjal J. Shah,Huaili Zheng,Chengyu Zhu
In this work, carboxylated chitosan and acrylamide are used to synthesize a graft-modified natural polymer flocculant carboxylated chitosan-graft-acrylamide (CCSPAM) by UV-induced polymerization for copper and chromium removal. The effects of total monomer concentration, monomer mass ratio, pH value, photoinitiator concentration, and illumination time on the synthesis performance of CCSPAM were investigated regarding intrinsic viscosity (IV), grafting rate (GR), and grafting efficiency (GE). Various analytical techniques characterize the physicochemical characteristics of CCSPAM. Single factor experiments are used to investigate the effect of dosage, pH value, and reaction time on the chelation and capture of heavy metal ions by CCSPAM. The results show that the optimal IV, GR, and GE of CCSPAM achieved at total monomer concentration 30%, monomer mass ratio 1:4, pH 7.0, photoinitiator concentration 0.03%, and irradiation time 2 h are 1412.2 mL/g, 394.1%, and 84.1%, respectively. The experimental data of flocculation show that CCSPAM has a good total Cu and total Cr removal efficiency of 74.8% and 70.6% at dosage 2.0 mg/L, pH 6.0, and reaction time 2h, respectively. Fom the investigation, it is concluded that the grafted chitosan (CCSPAM) could be a be an effective and eco-friendly flocculant for removal of total Cu and total Cr ions from aqueous system.
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DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Xinyao Wang,Shaofen Zhao,Wei Shi,Jiangli Sun,Zheming Ni,Shengjie Xia
In this study, WO 3 @NiCr-LDHs Z-scheme heterojunctions have been synthesised for the photodegradation of NOR. A comprehensive investigation was conducted into the effects of the Ni/Cr ratio, catalyst dosage, norfloxacin concentration, temperature and pH of the aqueous environment on the degradation activity of the composites. Furthermore, the stability and reusability of the catalyst after the reaction were discussed. The structural composition and morphological features of the materials were characterised by XRD, SEM and TEM, and the photoelectric properties of the heterojunctions were investigated by photoluminescence spectroscopy and UV–vis diffuse reflectance spectroscopy. The experimental findings demonstrated that a quantity of 15 mg of WO 3 @NiCr-LDHs in conjunction with 50 ml of a 10 mg/L norfloxacin solution in an aqueous environment at a temperature of 20°C and a pH of 7, resulted in 86.01 % of the material being degraded after 120 min of light irradiation. This value was found to be 2.75 and 1.23 times higher than that of WO 3 and LDHs, respectively. Kinetic and thermodynamic analyses indicated that the catalyst amount and temperature were the predominant factors influencing the photodegradation process. The efficient photodegradation is attributable to the built-in electric field produced by the Z-scheme heterojunction, which promotes the separation of photogenerated electron holes, allowing more electrons to be converted into free radicals to work with the holes in the degradation of NOR.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jing Zhang,Wenyu Xie,Shasha Chu,Zhangbin Liu,Zhen Wu,Yingying Lan,Vladimir V. Galvita,Lijuan Zhang,Xintai Su
Chromium ore processing residue (COPR) is a hazardous waste generated during the production of chromate. Currently, approximately 10% of Cr 2 O 3 cannot be extracted after chromite sodium roasting and remains in COPR, wasting valuable Cr resources. In this study, Mg was selectively removed by using (NH 4 ) 2 SO 4 roasting in combination with H 2 SO 4 leaching. The results showed that the selective removal of 79.55% Mg from COPR could be achieved under the optimum (NH 4 ) 2 SO 4 roasting conditions (80 mmol (NH 4 ) 2 SO 4 , 800 °C, 2 h). During the subsequent sodium roasting and acid leaching stages, the Cr extraction rate was 84.63% for the COPR direct roasting and 95.39% for the Mg removal residue roasting. The increased Cr extraction efficiency is attributed to the transformation of Mg-rich spinel and diopside (the Mg & Cr coexisting phases) in COPR converted into easily extractable (Fe,Cr) 2 O 3 and Cr 2 O 3 after the Mg treatment. This study investigated that the phase transformation of the Cr host phases is crucial for the sufficient extraction of Cr and provides inspiration for the development of efficient and practical Cr extraction techniques. Moreover, the method can be extended to the effective extraction of Cr from other Cr-containing wastes.
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DOI
PubMed
高影响因子
Small
·
2022
·Vol. 19
·期 10
·2205619
·
IF 15.153
Fei Yu,Xiaochen Zhang,Peng Liu,Bingbing Chen,Jie Ma
Metal-organic frameworks (MOF) have attracted extensive attention due to their ultra-high specific surface area and tunable structure, the mechanism of direct utilization for capacitive deionization (CDI) defluorination remains undefined. Here, MIL-101(Cr) with ultra-high specific surface area, high water stability, and open metal sites (OMSs) is prepared by a hydrothermal method for defluorination of CDI. Carbon black is used as a “chain” to connect F-stored in the holes of MIL-101(Cr) (Cr-MOF)as “blocks” to enhance the conductivity and ion storage capacity of MIL-101(Cr)/carbon black electrodes (Cr-MOF electrodes). This simple construction method avoids the process complexity of in situ synthesis and performs better. These easily constructed “blockchain-like” Cr-MOF electrodes exhibit excellent defluorination capacity (39.84 mg NaF g electrodes −1 ), low energy consumption (1.2 kWh kg NaF −1 ), and good stability. The coupling of the electrochemical redox reaction of Cr 3+ /Cr 4+ with confined water is investigated using in situ and ex situ analysis methods combined with density functional theory (DFT), resulting in an unprecedented defluorination mechanism for Cr-MOF electrodes. This study opens up new ideas for the application of MOF in CDI, clarifies the removal mechanism of MOF, and lays a foundation for further promoting the application of raw materials with poor conductivity in the field of CDI.
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DOI
PubMed
高影响因子
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