CERAMICS INTERNATIONAL
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2022
·
IF 5.532
Taotao Qiang,Boqiang Qiu,Lu Chen,Longfang Ren
In this work, a novel adsorbent for the removal of hexavalent chromium (Cr(VI)) in aqueous solution was successfully prepared by altering the 2D Ti 3 C 2 /chitosan composite with disodium ethylenediaminetetraacetate (EDTA·2Na) agent. The successful surface loading of chitosan on Ti 3 C 2 was demonstrated by various characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The adsorption of Cr(VI) by Ti 3 C 2 -based composite under various circumstances was evaluated using batch adsorption experiments. The adsorption performance of the optimal sample for Cr(VI) was investigated in detail through different influencing factors, and the adsorption process was analyzed by adsorption kinetics and isotherm model. In addition, XPS analysis of adsorbents before and after adsorption showed that some Cr(VI) was reduced to Cr(III) during the whole process, which was conducive to reducing the biological toxicity of Cr(VI). The mechanism analysis showed that the adsorption was mainly electrostatic physical adsorption, supplemented by chemical reduction adsorption. Finally, through the regeneration cycle experiment, it was found that the adsorption rate of Cr(VI) remained above 80% after six repeated adsorptions, indicating that the composite material had good stability and might have certain practical application value in the treatment of Cr(VI)-containing wastewater.
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
MOLECULES
·
2023
·Vol. 28
·期 17
·6305
·
IF 4.6
Zhemin Xie,Sijie Diao,Ruizheng Xu,Guiyu Wei,Jianfeng Wen,Guanghui Hu,Tao Tang,Li Jiang,Xinyu Li,Ming Li,Haifu Huang
The exploration of low-cost, high-performance adsorbents is a popular research issue. In this work, a straightforward method that combined hydrothermal with tube firing was used to produce Osmanthus fragrans biomass charcoal (OBC) from low-cost osmanthus for dye adsorption in water. The study examined the parameters of starting concentration, pH, and duration, which impacted the process of adsorption of different dyes by OBC. The analysis showed that the adsorption capacities of OBC for six dyes: malachite green (MG,C0= 800 mg/L, pH = 7), Congo red (CR,C0= 1000 mg/L, pH = 8), rhodamine B (RhB,C0= 500 mg/L, pH = 6), methyl orange (MO,C0= 1000 mg/L, pH = 7), methylene blue (MB,C0= 700 mg/L, pH = 8), and crystalline violet (CV,C0= 500 mg/L, pH = 7) were 6501.09, 2870.30, 554.93, 6277.72, 626.50, and 3539.34 mg/g, respectively. The pseudo-second-order model and the Langmuir isotherm model were compatible with the experimental findings, which suggested the dominance of ion exchange and chemisorption. The materials were characterized by using XRD, SEM, FTIR, BET, and XPS, and the results showed that OBC had an outstanding specific surface area (2063 m2·g–1), with potential adsorption mechanisms that included electrostatic mechanisms, hydrogen bonding, and π-π adsorption. The fact that the adsorption capacity did not drastically decrease after five cycles of adsorption and desorption suggests that OBC has the potential to be a dye adsorbent.Keywords:osmanthus fragrans biomass charcoal;adsorbent;high efficiency;dye adsorption;regeneration cycle
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
ENERGY & FUELS
·
2012
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IF 2.721
Qing Ye,Jianqing Jiang,Chunxia Wang,Yamin Liu,Hua Pan,Yao Shi
A solid amine adsorbent for CO2 was developed by carbon nanotubes (CNTs) impregnated with tetraethylenepentamine (TEPA). The adsorption behavior toward CO2 (2.0 vol %) was investigated in a fixed-bed column. After modification, the adsorption capacity of CNTs–TEPA reached 2.97 mmol g–1 at 298 K. Rising temperatures from 283 to 313 K enhanced the CO2 adsorption capacity. The maximum adsorption capacity was approximately 3.56 mmol g–1 at 313 K. The adsorption capacity was also influenced by moisture and reached as high as 3.87 mmol g–1 (2.0% H2O). In comparison to many other types of modified carbon or silica adsorbents in the literature, CNTs–TEPA had a higher adsorption capacity at the same temperature. The adsorption capacity for CO2 remained almost the same after cyclic regeneration experiments. A deactivation model, capable of describing the uptake of CO2, was applied under various conditions. In all cases, the experimental data agreed with the predicted breakthrough model.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
MICROCHIMICA ACTA
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2015
·Vol. 183
·期 1
·319-327
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IF 3.741
Shi Dechao,Yan Fanyong,Zhou Xuguang,Zheng Tancheng,Shi Yangyang,Fu Weigui,Chen Li
We describe core-shell structured magnetic chitosan microspheres (Rho-MCS) that were modified with a rhodamine spirolactam fluorescent probe. They are shown to be a viable fluorescent probe for the determination of mercury ion, and for its removal and preconcentration. The microspheres were characterized by FTIR, thermogravimetric analysis and high-resolution digital images, and these confirmed the successful loading with rhodamine probe. The microspheres represent excellent bare-eye colorimetric and fluorescent turn on probes for Hg(II) via a mechanism based on chelation-enhanced fluorescence. Hg(II) can be quantified with a limit of detection of 15 nM. The effects of pH, temperature, contact time and initial concentration on adsorption were also investigated. The results indicate that Rho-MCS possess high adsorption capacity (337 mg g −1 ) and superb removal capability (up to 97 %). A kinetic study shows that the adsorption mechanism can be described by a pseudo second-order equation, while the adsorption isotherm can be fit to a Langmuir model. Hg(II)-loaded Rho-MCS can be recycled by addition of ethylenediaminetetraacetic acid (EDTA). The capability for removal of Hg(II) was maintained above 86 % after five consecutive adsorption-desorption cycles.
The Rho-MCS microspheres modified with rhodamine spirolactam are shown to be viable turn-on fluorescence probe for the determination of Hg(II) and excellent adsorbent for its removal. It still maintains highly adsorption capacity after several regeneration cycles.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
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2019
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IF 1.354
Chenhua Shu,Lina Wang,Peijun Kong,Meizhu Gao
A poly ionic liquid, poly(1-vinyl imidazole)-p-xylylene dichloride (PVIm-PXDC), was synthesized and used for fuel oil denitrogenation. The structure of PVIm-PXDC was characterized and the denitrogenation performance was investigated. Results indicate that the pseudo-second-order kinetic model and Langmuir model are appropriate to describe the adsorption kinetics and thermodynamics, respectively. The adsorption ability of PVIm-PXDC for different nitrogen compounds follows the order of indole > pyrrole > quinoline > pyridine. The equilibrium adsorption amount decreased about 10% for all the nitrogen compounds after six regeneration cycles and the denitrogenation and regeneration processes have no influence on the structure of PVIm-PXDC.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2023
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IF 2.2
Ying Zhang,Xueru Sheng,Na Li,Qingwei Ping,Peng Lu,Jian Zhang
Corn stalk and diatomite were cross-linked by N,N'-Methylenebisacrylamide (MBA) to obtain gel porous materials for methylene blue adsorption, which improved the multi-element pores effect. The process solved the difficult recovery problem of powder adsorbents as well. Results showed that the optimal preparation conditions of corn stalk/diatomite gel porous materials were: 1 mL of glutaraldehyde, 6 g of acrylic acid, 150 mg of MBA and 100 mg of potassium persulfate. The adsorption process conditions were optimized: At the pH = 8, 8 mg of gel porous material was adsorbed for 1 hour. Under the optimal conditions, the removal percentage was 93.65% and the adsorption capacity reached 288.43 mg/g. The characterization results indicated that the corn stalk was successfully combined with diatomite. Corn stalk/diatomite gel porous materials had a three-dimensional network structure with more active sites. The adsorption isotherms fit the Langmuir model. Furthermore, the adsorption kinetics fit the pseudo-second-order model. The adsorbent surface is uniform and the adsorption process is mostly monolayer adsorption. The adsorption process includes chemical and physical adsorption. The maximum saturated adsorption capacity was 657.89 mg/g. Corn stalk/diatomite gel porous materials maintained good adsorption performance after cyclic adsorption. The adsorbent prepared in this study has a good regeneration cycle and methylene blue removal capacity.
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
RSC Advances
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2014
·Vol. 4
·期 90
·49000-49005
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IF 3.708
Xun Song,Siwei Yang,Lin He,Shuai Yan,Fang Liao
In this paper, ultra-flyweight hydrophobic poly(m-phenylenediamine) aerogel (PmPDA) was fabricated via a simple two step approach from a poly(m-phenylenediamine) micro-spherical shell (PmPDMS). The PmPDA was first formed by freeze-drying and then cross-linked via the oxidative polymerization of surface groups following an annealing process. The PmPDA is hydrophilic before the annealing process and becomes hydrophobic (the contact angle is 103.7°) after it is annealed in air. Moreover, the obtained ultra-flyweight PmPDA (ρ = 0.8 mg cm−3) has a large surface area (338 m2 g−1), low thermal conductivity (0.0125 W m−1 K−1 at 25 °C) and excellent mechanical properties. Finally, the regenerated aerogels retain their original shape and ultrahigh absorption capability after more than 10 cycles, making PmPDA an ideal candidate for practical application in the absorption or removal of organics, particularly in environmental protection and pollution control.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
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IF 5.6
Yingxing Zhang,Lidan Cao,Jielan Zhang,Junhong Wang,Guanghui Tian
The modified biochar nanomaterials were prepared by a simple polymerization and calcination method using spent walnut shell as raw material. And the prepared samples were characterized by means of various techniques. The influence of different adsorption materials, solution concentration and operation temperature on the adsorption efficiency of adsorbent to methylene blue in water were investigated. The results show that the prepared biochar sample C-1 had the highest BET surface area of 418.1 m 2 /g and the best adsorption efficiency of 97.61% at room temperature. And that the adsorption efficiency of the adsorbent was still remained 59.21% after 4 times of regeneration cycles. Furthermore, the adsorption process were further analyzed through adsorption kinetics and thermodynamic models. The results indicate that the adsorption was a spontaneous endothermic process and was well confirmed with pseudo-2nd-order kinetic model. Therefore, the adsorbent shows a potential application prospect. At the same time, it also provides an eco-friendly and inexpensive method for the effective utilization of other biomass resources and turning waste into treasure.
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
CARBOHYDRATE POLYMERS
·
2014
·
IF 3.916
Jiaxi Han,Kaijun Xie,Zhongjie Du,Wei Zou,Chen Zhang
A β-cyclodextrin (β-CD) functionalized polystyrene porous monolith was prepared by the following procedure: First, β-CD was modified with allyl bromide leading to allyl-β-cyclodextrin (allyl-β-CD); then a concentrated emulsion was prepared using a mixture of allyl-β-CD, styrene, and divinyl benzene as the continuous phase and water as the dispersed phase. In the third step, a β-cyclodextrin (β-CD) functionalized polystyrene porous monolith was obtained by copolymerization of allyl-β-CD and styrene followed by removal of the water phase. Since the allyl-β-CD contained both hydrophilic and hydrophobic groups, it tended to move towards the water/oil interface. As a result, the internal surfaces of the porous monolith were enriched with β-CD. This enrichment was indicated by X-ray photoelectron spectroscopy characterization. The high content of β-CD and the high specific surface area of the porous monolith both contributed to a high adsorption capacity. For example, the maximum adsorption of phenol was 5.74 mg/g. Importantly, the porous monolith could be easily regenerated and recycled through desorption with ethanol and it was found that the adsorption properties remained stable for at least five adsorption/desorption cycles.
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
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Tallat Munir,Jiawei Zhou,Ming Liu,Shiyang Bai,Jihong Sun
A highly effective synthetic clinoptilolite (SCP) was developed and assessed for its potential in the simultaneous removal of Cd 2+ , Ni 2+ , Mn 2+ , Sr 2+ , and Fe 3+ from an aqueous solution. The present work explored the influences of SCP dosage, initial metal ion concentrations, temperature, contact time, and pH value on the adsorption performances of these metal ions. The results revealed exceptionally high adsorption capacities, reaching 2000, 1720, 1875, 1510, and 22 mg/g for Ni 2+ , Fe 3+ , Cd 2+ , Mn 2+ , and Sr 2+ , respectively. The specific surface area of SCP increased from 31.4 to 44.7 m 2 /g after five cycles. The adsorption mechanism and structure assessment were elucidated by XRD patterns and SEM images, showing that the Fe 3+ adsorption conformed to the Langmuir isotherm, while that of Mn 2+ , Cd 2+ , Sr 2+ , and Ni 2+ followed the Freundlich isotherm model with the adsorption kinetics best described by the pseudo-2nd-order kinetic model. Thermodynamic parameters showed endothermic behavior for Cd 2+ , Ni 2+ , Mn 2+ , and Sr 2+ , exothermic for Fe 3+ , and spontaneity for all metals except Sr 2+ . SCP retained over 90 % of its adsorption capacity after five regeneration cycles, maintaining structural integrity under thermal, acidic, and recycling conditions. These findings highlight SCP’s robust characteristics, reusability, and potential for sustainable heavy metal removal from wastewater.
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
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Kai Zong,Kejie Jiang,Xiaojun Bao,Dongshun Deng
The capture of ammonia (NH 3 ) from exhaust gases is essential for improving the environmental quality and ecological health. Developing structurally stable adsorbents with excellent performance remains a challenge. In this work, we synthesized three novel sulfonated hyper-crosslinked polymers (sHCPs) with distinct structural characteristics and evaluated their NH 3 adsorption performance. Notably, the preferred sHCP-1 demonstrated remarkable stability and an impressive NH 3 uptake capacity of 11.54 mmol/g at 30℃ and 1.0 bar. Moreover, it can maintain an NH 3 adsorption capacity exceeding 10.0 mmol/g after ten regeneration cycles. The adsorption of NH 3 on the sHCP-1 conformed to the pseudo second kinetic and Weber-Morris diffusion models. Comprehensive thermodynamic and spectroscopic analyses of NH 3 on sHCP-1 were performed to elucidate the adsorption behavior. The adsorption mechanism clarified that the well-developed micro/mesoporous structure provided abundant adsorption sites, where the chemisorption between acidic -SO 3 H groups and basic NH 3 facilitated the formation of NH 4 + from NH 3 . Present work systematically investigated the NH 3 adsorption process of sHCPs, offering valuable insights for the development of efficient and reversible NH 3 adsorbents.
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
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 38
·16683-16691
·
IF 2.7
Xiaoyu Cao,Huifang Yang,Jihui Luo,Jianxian Zeng,Zhanfang Cao,Xiaoping Huang
Highly efficient and selective extraction of silver ions from wastewater remains a formidable challenge in ensuring public health and protecting ecosystems. Herein, an acyl-based thiourea extractant known as N-benzoyl-N′,N′-dibutyl thiourea (BDBTU) was used for the selective extraction of silver ions from aqueous solution by a solvent extraction method. BDBTU displayed an outstanding extraction efficiency of Ag(I) with an extraction ratio of 96.7% under the optimal extraction conditions, surpassing its effectiveness for Cu(II) and Mn(II) ions. In addition, BDBTU retained high effectiveness even after undergoing eight regeneration cycles, with only a slight decrease in the extraction efficiency from 96.7% to 95.2%. Moreover, it displayed selective extraction towards Ag(I) ions under the interference of metal ions (i.e., Cu(II), Pb(II), Mn(II), Zn(II), Ni(II), Co(II) and Na(I)). The investigation into the extraction mechanism of BDBTU towards Ag(I) unveiled that BDBTU provided a high affinity for Ag(I) accompanied by the formation of Ag–O–C and Ag–S–C bonds. These results indicated that the exceptional extraction stability and selectivity of BDBTU offer promising prospects for diverse applications, highlighting its potential in silver-containing wastewater treatment fields.
研究领域:
环境科学
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化学工程
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分析化学
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材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）