JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2016
·Vol. 310
·期 3
·1001-1011
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IF 0.983
Xiao Jiang,Jing Yan,Yao Ying,Xie Shaolei,Wang Xingquan,Shi Chenglong,Jia Yongzhong
Herein, the amine-functionalized MCM-41 mesoporous silica (denoted as MCM-41-NH 2 ) was synthesized and applied to adsorption and recovery U(VI) ions from aqueous solutions. The results showed that the sorption of U(VI) on MCM-41-NH 2 was strongly dependent on pH and ionic strength. The sorption was mainly dominated by outer-sphere surface complexation and the sorption equilibrium can be reached within 60 min. The maximum sorption capacity of MCM-41-NH 2 for U(VI) was calculated to be 386.98 mg g −1 at pH 5.60, much higher than that of the other reported materials.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2013
·
IF 3.365
Xudong Zhao,Dahuan Liu,Hongliang Huang,Wenjuan Zhang,Qingyuan Yang,Chongli Zhong
The stability of metal–organic frameworks (MOFs) in fluoride solutions was studied based on 11 water-stable MOFs (MIL-53(Fe, Cr, Al), MIL-68(Al), CAU-1, CAU-6, UiO-66(Zr, Hf) and ZIFs-7, -8, -9), and several factors were found to have large influence, such as the central metal activity, pore topology and coordination number. Furthermore, the defluoridation performance of UiO-66(Zr) was investigated comprehensively, which shows an adsorption capacity of 41.36 mg g −1 that is higher than most of the reported adsorbents. The initial pH of fluoride solution has little effect in neutral range, while shows a negative effect when pH >9.0; the adsorption data of UiO-66(Zr) fit well with the Langmuir model, and pseudo-second-order kinetic model was found to be suitable for depicting the F − adsorption process, and finally, it was observed that the extent of the effect of co-existing ions is largely ion-dependent. On the basis of the systemic study, this work suggests that increasing the number of –OH groups is an efficient strategy to improve the defluoridation performance of MOFs, and MOFs are promising adsorbents for defluoridation in waste water.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Mengling Xie,Mingqiang Zhong,Chenni Qin,Yang Liu,Hui Zhao,Wenbo Yin
In this study, bagasse cellulose-based porous foams were developed using bleached sugarcane bagasse pulp as the main raw material. The intention was to achieve controlled oil/water separation using low-cost and environmentally acceptable raw materials to solve the current problem of oily wastewater treatment . Bagasse cellulose-based foams with 3D structure and good mechanical properties were produced via freeze-drying. A pH-responsive copolymer was synthesized by free radical polymerization to modify the foam with pH-responsive wettability. Results showed that bagasse cellulose-based foams with an adsorption capacity of up to 48.77 g/g, and their pH-responsive properties could easily achieve the wettability transition between super-oleophilic (oil contact angle is 0°) and super-oleophobic (oil contact angle is 157.3°). The changes in foam wettability were realized by the conformational transition of pH-responsive copolymers under different pH values. Ultimately, the pH-responsive switchable wettability of the foam was still able to reach 80% adsorption capacity after five cycles, demonstrating excellent stability and recyclability.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Wei Wang,Pin Ma,Haibo Li
Transition metal oxides (TMOs) have great application potential in capacitive deionization (CDI), which can selectively extract ions from water with high charge efficiency and low contamination. Previous studies have found that cationic segregation of TMOs has adverse effects on their electrochemical performance, but its effect on CDI remains unclear. Herein, we demonstrate for the first time that Ca 2+ segregation provides more sites for F − adsorption by synthesizing Ca 2 Mn 3 O 8 for CDI selective defluorination . The Ca 2 Mn 3 O 8 material has a graded porous structure , low charge transfer resistance , high specific capacitance (255.64 F/g, 1 mV/s, 0.5 M NaF solution) and good charge/discharge reversibility (about 100 % charge specific capacity retention after 50 cycles). Moreover, Ca 2 Mn 3 O 8 has a high specific adsorption capacity (SAC) for NaF (1419.07 μmol/g) and excellent cyclic stability (capacity retention rate is 96.69 % after 100 cycles). The Ca 2+ segregation from lattice to surface provides more sites for F − adsorption and greatly shortens ion transport paths. Density functional theory (DFT) calculation further suggests that the adsorption energy of Ca 2 Mn 3 O 8 for F − is much greater than that of Cl − . As a result, the removal rate of F − by Ca 2 Mn 3 O 8 in mixed solutions is up to 20 times higher than that of Cl − .
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Fuhua Wei,Haiyan Liu,Qinhui Ren,Lu Yang,Lan Qin,Hongliang Chen,Yufu Ma,Zhao Liang,Siyuan Wang
Zr-MOF was prepared under solvothermal conditions using zirconium acetate as the metal ion and 2,5-dihydroxyterephthalic acid as the organic ligand. It was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetry (TG). Zr-MOF was used as an adsorbent to remove norfloxacin from aqueous solutions. The experimental results were fitted, and the results showed that the pseudo-second-order kinetics model was appropriate for studying the removal of norfloxacin. We investigated the adsorption capacity of Zr-MOF under different masses, concentrations, and pH values. At pH 10, the maximum adsorption capacity after 5 h was 134.5 mg/g.Compared with another adsorbent,the adsorption capacity of Zr-MOF was higher.The removal of norfloxacin from an aqueous solution using Zr-MOF was feasible, inexpensive, and effective. Our findings indicate that Zr-MOF has broad application prospects for the purification of an aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Chemistry
·
2022
·
IF 3.241
Anxiang Huang,Wenlian Bai,Shoulu Yang,Zhongwei Wang,Nengying Wu,Yanxiong Zhang,Ning Ji,Dan Li
The purpose of this study was to fabricate a low-cost and eco-friendly adsorbent using bamboo biochar (BB), a kind of charcoal composed of high Brunauer–Emmett–Teller surface area and variety of functional groups, and chitosan as substrates for remediation of Cd(II) in Cd(II) contaminated water and characterized the functional group characteristics, surface morphology, and Cd(II) adsorption effect using the Fourier transform infrared (FT-IR), scanning electron microscope (SEM), and energy-dispersive X-ray spectrometer (EDS). Results showed that chitosan-modified bamboo biochar (CBB) provided more active adsorption sites (such as –NH2, –COOH, –OH, and C=O) on the surface to enhance the Cd(II) removal efficiency in Cd(II) contaminated wastewater. Meanwhile, the optimal pH, contact time, and dose of CBB on the Cd(II) removal efficiency are 7, 120 min, and 600 mg, respectively. In addition, the adsorption isotherm results revealed that the possible adsorption mechanisms might include surface adsorption, electrostatic adsorption, and ion exchanges. Furthermore, the maximum adsorption capacity (Qm) values predicted from the Langmuir model were 37.74 and 93.46 mg/g for BB and CBB, respectively, also indicating a potential application of CBB in practical wastewater. Desorption and regeneration of CBB were attained simultaneously and the results showed that even after five cycles of adsorption-elution, the adsorption and desorption of CBB exhibited a slight decline and still reached at 71.70% and 65.92%. Results from this study would provide a reference to functionalized CBB for Cd(II) adsorption in contaminated water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Chunming Tang,Yuancheng Qin,Cailing Ni,Jianping Zou
Hg/Hg(II) is deemed to be the most toxic heavy metal to humans. Therefore, designing suitable adsorbents to simultaneously achieve high capacity, rapid mercury adsorption, and fluorescence detection is still an important challenge in overcoming Hg2+ pollution. Here, we report a flexible alkylamine covalent organic framework (TpTSC), which has been used as an efficient adsorbent and achieves the dual-functional application of TpTSC for Hg2+, with a fluorescence detection limit of 2 ppm and simultaneously a removal capacity of 1035 mg g–1. It can remove 10 ppm mercury solution to below 2 ppb (drinking water standard) within 10 min, and the removal rate is as high as 99.98%. To a certain extent, it exceeds the recently reported thioether or thiol functionalized adsorbents. The kinetic study shows that TpTSC displays a very high Kd value, with Kd = 1.2 × 109 mL g–1, which has a strong affinity for mercury. In addition, TpTSC displays a good recycling capacity, with a removal rate of over 90% after five cycles. In conclusion, sulfur modification is a useful strategy for developing dual-functional COFs to simultaneously remove and detect toxic heavy metal ions.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2016
·
IF 5.393
Hailong Li,Lei Zhu,Jun Wang,Liqing Li,Kaimin Shih
The surface area of zinc sulfide (ZnS) was successfully enlarged using nanostructure particles synthesized by a liquid-phase precipitation method. The ZnS with the highest surface area (named Nano-ZnS) of 196.1 m2·g–1 was then used to remove gas-phase elemental mercury (Hg0) from simulated coal combustion fuel gas at relatively high temperatures (140 to 260 °C). The Nano-ZnS exhibited far greater Hg0 adsorption capacity than the conventional bulk ZnS sorbent due to the abundance of surface sulfur sites, which have a high binding affinity for Hg0. Hg0 was first physically adsorbed on the sorbent surface and then reacted with the adjacent surface sulfur to form the most stable mercury compound, HgS, which was confirmed by X-ray photoelectron spectroscopy analysis and a temperature-programmed desorption test. At the optimal temperature of 180 °C, the equilibrium Hg0 adsorption capacity of the Nano-ZnS (inlet Hg0 concentration of 65.0 μg·m–3) was greater than 497.84 μg·g–1. Compared with several commercial activated carbons used exclusively for gas-phase mercury removal, the Nano-ZnS was superior in both Hg0 adsorption capacity and adsorption rate. With this excellent Hg0 removal performance, noncarbon Nano-ZnS may prove to be an advantageous alternative to activated carbon for Hg0 removal in power plants equipped with particulate matter control devices, while also offering a means of reusing fly ash as a valuable resource, for example as a concrete additive.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Rui Ou,Wenjian Zhu,Lulu Li,Xuyu Wang,Qian Wang,Qiang Gao,Aihua Yuan,Jianming Pan,Fu Yang
The great challenge in capturing harmful volatile organic compounds (VOCs) using Metal-Organic-Frameworks (MOFs) materials still rely on rationally modifying its appreciable microporous character in hydrostable structure. Defected structure in MOFs might be very beneficial for creating expected engineering adsorbent. In this study, defect-engineering UiO-66 via imparting acetic acid (HAc) as an interfering agent was successfully fabricated by a simple hydrothermal method. The physicochemical properties of the obtained materials were intensively ascertained and identified through a series of applicable characterizations. By the proper participation of tuning concentration of HAc (HAc/TAc = 24, molar ratio), the obtained adsorbent UiO-66–1.0HAc was endowed with the highest adsorption capacity for benzene (367.13 mg g −1 , 25 °C) in the known UiO-66 materials, which was 41.9% higher than that of the non-defected UiO-66. With a higher optimized added amount of HAc (HAc/TAc = 48, molar ratio), the adsorption capacity of UiO-66–2.0HAc to toluene achieved the highest capture values (410.21 mg g −1 , 25 °C), which boosted 93% compared with the original counterpart. This demonstrated improvement was ascribable to the imparted structural defect-engineering derived from the missing-linkers of MOFs increasing the unsaturated adsorption site and concomitant enlarged structural properties of the resultant material. By identifying the DIH (Difference in adsorption heat), the obtained maximum adsorption selectivity of UiO-66–1.0HAc to toluene/water was further enhanced to 64.4, which was 3.7 times the original UiO-66, owing to the existed defect-engineering in adsorbents, indicating the potential differential competitive adsorption effect for benzene and toluene under humid conditions.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Tingting Wang,Yihui Chen,Junfeng Ma,Mingliang Chen,Chenggang Nie,Minjie Hu,Ying Li,Zhijian Jia,Jianghua Fang,Haoqi Gao
A novel sorbent for solid-phase extraction (SPE) was synthesized by chemical immobilization of ampholine on hybrid organic–inorganic silica material. The ampholine-functionalized hybrid organic–inorganic silica sorbent is consisted of aliphatic amine groups, carboxyl groups and long carbon chains, allowing for extraction of both acidic and basic compounds. The retention properties of the developed sorbent were evaluated for 1-hydroxy-2-naphthoic acid (HNA), 1-naphthoic acid (NA), 3-hydroxybenzoic acid (HBA), benzoic acid (BA), sorbic acid (SA), vanillic aldehyde (VA), butyl 4-hydroxybenzoate (BHB), propyl 4-hydroxybenzoate (PHB), ethyl 4-hydroxybenzoate (EHB), and methyl 4-hydroxybenzoate (MHB). The results show that such a sorbent has three types of interaction, i.e., electrostatic interaction, hydrophobic interaction, and hydrogen bonding, exhibiting high extraction efficiency towards the compounds tested. The adsorption capacities of the analytes ranged from 0.61 to 6.54 μg mg −1 . The reproducibility of the sorbent preparation was evaluated at three spiking concentration levels, with relative standard deviations (RSDs) of 1.0–10.5%. The recoveries of ten acidic and basic compounds spiked in beverage Coca-Cola ® sample ranged from 82.5% to 98.2% with RSDs less than 5.8%. Under optimum conditions, the ampholine-functionalized hybrid organic–inorganic silica sorbent rendered higher extraction efficiency for acidic compounds than that of the commercially available ampholine-functionalized silica particles, and was comparable to that of the commercial Oasis WAX and Oasis WCX.
研究领域:
分析化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·Vol. 32
·期 7
·3326-3341
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IF 4.7
Wang Rui,Song Xin,Liu Li,Zhou Chao,Wu Guangfeng
Magnetic particles with active groups on their surfaces can be applied to wastewater purification to remove harmful ions, but the insufficient number of active groups on their surfaces tends to limit their removal rate of ions. Herein, we grafted different generations of dendritic macromolecular polyamidoamine (PAMAM) onto the magnetic chitosan microspheres (MCS) using ethylenediamine tetraacetic acid (EDTA) as core (MCEPs) for the removal of Cu (II). Firstly, 7 μm-sized MCS with good dispersibility was prepared by adjusting conditions such as glacial acetic acid content, emulsifier content and raw material ratio. Secondly, the effect of MCEPs generation, pH and contact time on the adsorption capacity were investigated. The adsorption experiments showed that the MCEPs had a high adsorption capacity, when the adsorbent was the second generation of MCEP (MCEP G2.0), the maximum adsorption capacity can up to 702.9 mg/g and the adsorption process can be completed in 60 min. Moreover, among various isotherms models, MCEP G2.0 was well-fitted by Langmuir adsorption isotherm. Also, adsorption kinetic studies proved that the adsorption mechanism of MCEP G2.0 adsorbent followed the pseudo-second-order kinetic model, demonstrating that the process was chemisorption. The adsorbent has renewability as well, after five adsorption cycles, its adsorption efficiency was still higher than 80%. Therefore, the adsorbent showed a superior adsorption capacity and renewability to remove Cu (II). Graphical
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 24
·3156-3163
·
IF 2.596
Mengxin Zhang,Tong Xu,Tian Tian,Yi Zhang,Xing Li,Heng Yan,Wei-hong Xie
A poly(St-co-EGDMA)@poly(4-vinylpyridine-co-EGDMA) composite polymer was synthesised by precipitation reversible addition–fragmentation chain transfer (RAFT) polymerization. The polymer was investigated as a sorbent for extraction of synthetic food dyes: ponceau 4R, tartrazine, sunset yellow, brilliant blue and erythrosine from soft drinks. The morphology and composition of the polymer were characterized and confirmed respectively by scanning electron microscopy and Fourier-transform infrared spectroscopy. The pH dependence experiment revealed that the adsorption of food dyes by the polymer was pH dependent and the maximum adsorption was achieved at pH 3. Adsorption between the polymer and the dyes was mainly due to electrostatic interaction. Under the optimized pH conditions, the polymer was saturated with the dye solutions at a concentration of about 200 μg mL−1 and exhibited a maximum adsorption capacity of 9 μg mg−1. The values were higher than those for polyamide, a sorbent used in the standard method. The recovery from the real samples of the three spiked concentrations 10, 50 and 100 μg mL−1 was respectively within the ranges of 83.2–107.2%, 94.5–110.7% and 79.2–111.5%, with a SD within ±4%. The sorbent could be reused more than 10 times with a recovery higher than 80%. The small volume requirement of the sample and sorbent during the sample pre-treatment, indicated that poly(St-co-EGDMA)@poly(4-vinylpyridine-co-EGDMA) was a potential material for food dye extraction in an environment-friendly and economical manner.
研究领域:
食品科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）