RSC Advances
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2017
·Vol. 7
·期 11
·6605-6614
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IF 3.108
Ce Gao,Qingda An,Zuoyi Xiao,Shangru Zhai
Nowadays, processing of ultra-low sulfur fuel oil has been a hot topic of research all over the world; hence, an efficient adsorption process to tackle this issue is eliciting increasing attention. However, the preparation of high-performance adsorbents is still a challenge. Herein, zirconium-substituted mesoporous SBA-15 with highly dispersed active Cu(I) species has been successfully synthesized by our group at 493 K via a mild vapor-reduction method. The as-prepared material was characterized by powder X-ray diffraction (XRD), nitrogen adsorption and desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis diffuse reflectance (DRUV) spectroscopy. All characterization methods demonstrated that the Cu(I) species were highly dispersed in an ordered mesoporous framework with short channels rather than piled on the surface. The as-prepared materials also exhibited an excellent adsorption capacity for thiophene (up to 29.86 mg g−1 at 323 K). Pseudo-second-order kinetics model and Freundlich isotherm can well describe the adsorption kinetics and isotherm data, respectively. More remarkably, an ultrasound-assisted treatment can be effectively employed to regenerate adsorbent, with only a slight reduction in the adsorption capacity after five cycles.
研究领域:
材料科学
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能源化学
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环境工程
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DOI
高影响因子
MOLECULES
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2021
·Vol. 26
·期 6
·1785
·
IF 4.412
Zhe Jiang,Nian Li,Pei-Ying Li,Bo Liu,Hua-Jie Lai,Tao Jin
Chitosan is a kind of biodegradable natural polysaccharide, and it is a very promising adsorber material for removing metal ions from aqueous solutions. In this study, chitosan-based magnetic adsorbent[email protected]3O4was synthesized by a one-step method using carboxymethyl chitosan (CMC) and ferric salts under relatively mild conditions. The Fe3O4microspheres were formed and the core–shell structure of[email protected]3O4was synthesized in the meantime, which was well characterized via SEM/TEM, XRD, VSM, FT-IR, thermo gravimetric analysis (TGA), XPS, size distribution, and zeta potential. The effects of initial arsenic concentration, pH, temperature, contact time, and ionic strength on adsorption quantity of inorganic arsenic was studied through batch adsorption experiments. The magnetic adsorbent[email protected]3O4displayed satisfactory adsorption performance for arsenic in water samples, up to 20.1 mg/g. The optimal conditions of the adsorption process were pH 3.0, 30−50 °C, and a reaction time of 15 min. The adsorption process can be well described by pseudo-second-order kinetic model, suggesting that chemisorption was main rate-controlling step. The Langmuir adsorption model provided much higher correlation coefficient than that of Freundlich adsorption model, indicating that the adsorption behavior is monolayer adsorption on the surface of the magnetic adsorbents. The above results have demonstrated that chitosan-based magnetic adsorbent[email protected]3O4is suitable for the removal of inorganic arsenic in water.Keywords:chitosan;adsorption;magnetic adsorbents;inorganic arsenic
研究领域:
环境科学
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材料科学
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水处理
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Yueyue Gao,Yiqian Yao,Chuanwen Zhao,Pu Huang,Yafei Guo,Jian Sun
The capture of CO 2 from flue gas after combustion using solid sorbents is one of the efficient options for reducing CO 2 emissions from fossil fuel-fired power plants. To satisfy the requirement of large quantities flue gas treatment, the CO 2 capture capacities of the solid sorbents must be focused on. In this study, K 2 CO 3 /Al 2 O 3 adsorbents were prepared via spray granulation, achieving an optimal CO 2 adsorption capacity of 1.89 mmol/g at a potassium carbonate loading of 30 wt%. To address the limitations of potassium-based adsorbents, we further enhanced the performance by incorporating polyethyleneimine (PEI), an amine-functionalized material known for its high CO 2 affinity, in the K30Al adsorbent. A series of potassium-amine composite adsorbents were synthesized with varying PEI loadings (1 wt%, 3 wt%, 5 wt%, and 7 wt%). Remarkably, a synergistic effect between K 2 CO 3 and PEI was observed, with the 5 wt% PEI loading yielding the highest CO 2 adsorption capacity of 2.19 mmol/g, representing a 16 % improvement over the unmodified adsorbent. This represents a novel K30Al-P5 composite adsorbent successfully fabricated through deposition of a small amount of PEI onto pre-synthesized K30Al substrate via the spray granulation method. Comprehensive characterization, including adsorption capacity, cyclic stability, and structural properties, revealed that the enhanced performance is attributed to the optimized interaction between K 2 CO 3 and PEI, which facilitates CO 2 chemisorption and diffusion. This study not only demonstrates a significant improvement in CO 2 capture efficiency but also provides a scalable and cost-effective strategy for designing high-performance adsorbents.
研究领域:
环境科学
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化学工程
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材料科学
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能源技术
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DOI
高影响因子
Nuclear Engineering and Technology
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2021
·
IF 2.341
Hao Wu,Tatsuya Kudo,Seong-Yun Kim,Misako Miwa,Shigeo Matsuyama
A porous silica-based adsorbent was prepared by impregnating the pores of a silica support with the extractant 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-calix[4]arene (Calix[4]arene-R14) and an additive agent 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C 2 mim + NTf 2 − ) as the materials to remove cesium(I) (Cs + ) ions from seawater. The as-prepared adsorbent showed excellent adsorption performance toward Cs + ions, with adsorption equilibrium reached within 2 h and an adsorption amount of 0.196 mmol/g observed. The solution pH, temperature, and the presence of coexisting metal ions were found to have almost no effect on Cs + adsorption. The adsorption mechanism was considered to proceed via ion exchange between Cs + and C 2 mim + . In addition, the particle-induced X-ray emission analysis results further clarified that the adsorbed Cs + ion species on the adsorbent was in the form of both CsCl and CsBr.
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
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
·
IF 1.5
Gado Mohamed A.
(Pyridine-2,5-diylbis(azaneylylidene)) bis-(methaneylylidene)) bis(benzene-5,1,3-triyl) tetrakis (hydrogen phosphonate) (PZMB) was successfully synthesized for Th(IV) and Ce(IV) adsorption, the adsorption parameters evaluated and found to be pH 3.5, time 60 min, dose 0.15 g. Adsorption kinetics, isotherm, and thermodynamics studies. Adsorption kinetics studies show that adsorbent follow pseudo-second-order model while isotherm studies conclude that adsorption processes fitted Langmuir and D-R isotherm model. The maximum adsorption capacity of BZMB of Th(IV) and Ce(IV) are 366.4 and 244.53 mg/g respectively, Thermodynamic studies indicate both adsorption processes exhibited by the PZMB were endothermic, spontaneous and sorption occurs in a random manner.
研究领域:
化学工程
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环境科学
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高影响因子
Applied Sciences-Basel
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2018
·Vol. 8
·期 9
·1518
·
IF 1.689
Keteng Li,Genhua Wu,Min Wang,Xiaohong Zhou,Zhuqing Wang
A low-cost alginate-melamine hybrid sorbent (named as Alg-Mel) was designed and synthesized for the removal of Pb2+from water. The as-prepared Alg-Mel sorbent exhibited high affinity and selectivity to Pb2+. The selectivity coefficients of the Alg-Mel for Pb2+/Cd2+, Pb2+/Cu2+, Pb2+/Cr3+and Pb2+/Co2+were all over 7. It is found that the hybrid sorbent could uptake 95.4% of Pb2+from Pb2+-containing solutions (0.48 mM), and the maximum adsorption capacity for Pb2+reaches 1.39 mmol/g (287.7 mg/g), which is much higher than that of most reported lead ion-sorbents. Furthermore, the Alg-Mel can be regenerated by a simple acid-washing process and used repeatedly. The results of adsorption mechanism analysis reveal that the adsorption of Pb2+by Alg-Mel is mainly ascribed to the chemical coordination and ion exchange effects.Keywords:adsorption;alginate;adsorbent;lead ion;wastewater
研究领域:
环境科学
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化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2014
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IF 4.258
Chun Wang,Ruiyang Ma,Qiuhua Wu,Meng Sun,Zhi Wang
In this paper, porous carbon with a highly ordered structure was synthesized using zeolite ZSM-5 as a template and sucrose as a carbon source. Through the in situ reduction of Fe 3+ , magnetic property was successfully introduced into the ordered porous carbon, resulting in a magnetic porous carbon (MPC). MPC was used as an adsorbent for the extraction of some chlorophenols (2-chlorophenol, 3-chlorophenol, 2,3-dichlorophenol and 3,4-dichlorophenol) from water and peach juice samples followed by high performance liquid chromatography-ultraviolet detection. Good linearity was observed in the range 1.0–100.0 ng mL −1 and 2.0–100.0 ng mL −1 for water and peach juice sample, respectively. The limits of detection ( S / N = 3) were between 0.10 and 0.30 ng mL −1 . The relative standard deviations were less than 5.3% and the recoveries of the method for the compounds were in the range from 87.8% to 102.3%. The results demonstrated that the MPC had a high adsorptive capability toward the four chlorophenols from water and peach juice samples.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2017
·
IF 0
D. Martemianov,B.-B. Xie,T. Yurmazova,M. Khaskelberg,F. Wang,C.-H. Wei,S. Preis
Aqueous arsenic and heavy metals in concentrations exceeding sanitary limits present an acute regional problem. Adsorption is an effective although costly method of pollutants removal. This makes the search for low-cost effective disposable adsorbents necessary. The adsorbents using vermiculite concrete and aerated autoclaved light concrete (aerocrete) modified with iron oxyhydroxide were synthesized and studied. The specimens of adsorbent materials showed the adsorption capacity more than two-fold exceeding the vermiculite-based adsorbents in respect to copper and lead cations, 53 and 195 mg g −1 , respectively, having the adsorption capacity for cadmium comparable to exfoliated vermiculite at 35.5 mg g −1 . Arsenic anions were adsorbed in amounts comparable to the ones of carbon composites-supported ferric oxyhydroxide adsorbents, up to 16 mg g −1 of arsenate. The analysis of adsorption dependent on temperature showed its spontaneous low-energy ion-exchange character. Desorption of heavy metals and arsenic anions from used adsorbents meets the requirements of drinking water standards with the exception of cadmium, meeting the agricultural use standard of 0.01 mg L −1 . The new synthetic adsorbents were found to be cost-efficient, safe and reliable in removal of arsenic anions and heavy metals cations.
研究领域:
环境科学
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材料科学
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DOI
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 30
·11897-11907
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IF 8.262
Hualin Jiang,Weibo Zhang,Pinghua Chen,Weiwei Zhang,Guoyao Wang,Xubiao Luo,Shenglian Luo
A novel composite that can simultaneously detect and remove heavy metals was prepared in this study. Its adsorption ability rivals that of excellent traditional adsorbents; furthermore, it can change the color to identify the adsorbate and its concentration. The color changes are very easy to detect via the naked eye or with a photometer. This novel adsorbent can remove a large amount of heavy metal ions, and also qualitatively and quantitatively detect heavy metal ions in water. Cu(II) and Fe(II) were used to investigate the detection and removal properties of the composite, and SEM, BET, FTIR, zeta potential and XPS were used to physicochemically characterize it. Batch sorption experiments were conducted to study the effects of various factors such as pH, the presence of coexisting metal ions, the contact time and the initial metal concentration. The studies indicated that the adsorption process fits well to the Langmuir model, and the kinetic data could be described very well by the pseudo-second-order kinetic model. The mechanism of adsorption has been discussed in detail. This study provides a simple method for the preparation of smart adsorbents.
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
CELLULOSE
·
2021
·Vol. 29
·期 2
·941-952
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IF 5.044
Hu Tao,Hu Xiaoli,Tang Cheng,Liu Dan
This paper describes the synthesis of a novel chelating material derived from cellulose, and its heavy metal ion adsorption properties from aqueous solution. The first section of this paper reports the chemical grafting of cellulose, that amino acetic acid groups were grafted onto the cellulose by in situ synthesis, a novel yet unreported modified cellulose derivative N,N-(dicarboxymethylaminoethyl, carboxymethyl)aminoethylamine carboxymethyl cellulose amide was synthesized. This obtained adsorbent was characterized by elemental analysis, infrared spectroscopy (IR) and Solid State Nuclear Magnetic Resonance (SSNMR) 13 C NMR spectroscopy. In the second section, the adsorption of Cu 2+ and Pb 2+ from single metal ion aqueous solutions onto this adsorbent were evaluated and analyzed by the Freundlich and Langmuir models. Further more, adsorption capacity for Ba 2+ , Mg 2+ , Mn 2+ , Co 2+ , Zn 2+ , Pb 2+ , Ni 2+ and Cu 2+ , and the competitive adsorption of this adsorbent between ions were also evaluated by ICP spectroscopy. The results indicated that this modified cellulose exhibited adsorption properties similar to those of EDTA, and showed good adsorption capacity for a wide range of metal ions.
Graphical abstract
研究领域:
环境科学
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材料科学
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高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2021
·
IF 5.455
Jingting Su,Hui Lu,Fang Wang,Yu Lu,Ruohu Zhang,Jun Xiao,Yiping Cui,Li Zhu
Cooperative adsorption and degradation in situ, known as “hook and destroy” strategy, is an appealing idea to scavenge pollutants from water efficiently. However, commercial high-adsorption-capacity adsorbents are usually based on activated carbon, which is easily damaged in the pollutant degradation process, resulting in decreasing of the adsorption performance, while the adsorption capability of most inorganic adsorbents is inadequate for practical applications. To address the issues, we prepared a novel mesoporous titanium dioxide (m-TiO 2 ) by facile one-step hydrolysis method at room temperature. The m-TiO 2 exhibits both high adsorption capacity and short equilibrium time for a wide range of pollutants, such as dyes, pharmaceuticals and pesticides, due to its large surface area and abundant functional groups. The surface charge of the m-TiO 2 adsorbent can be regulated by adjusting the acidity and alkalinity of preparation conditions, hence the m-TiO 2 is capable of adsorbing either positively or negatively charged pollutants. The versatility for adsorption of diverse contaminants was demonstrated in the experiment of purifying lake water with multiple pollutants. More significant, the m-TiO 2 can be regenerated in minutes by in-situ degrading the adsorbed molecules using common oxidants, such as hypochlorite, the active ingredient of disinfectants. The adsorption performance has little deterioration in at least five successive cycles of adsorption and degradation. Considering the excellent adsorption performance, wide applicability and high recyclability, the mesoporous TiO 2 offers a sustainable approach to increasingly complex water environmental problems.
研究领域:
环境科学
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材料科学
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高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Xianjun Tan,Zhenying Jiang,Wenhui Ding,Mingkun Zhang,Yuxiong Huang
The global occurrence of per- and polyfluoroalkyl substances (PFAS) in aquatic systems has raised concerns about their adverse effects on ecosystems and human health. Adsorption is a promising technique for the remediation of PFAS, yet effective adsorbents with rapid uptake kinetics and high adsorption capacity are still in high demand, and molecular-level understanding of the interfacial adsorption mechanisms is lacking. In this study, we developed a superior layered rare-earth hydroxide (LRH) adsorbent, ultrathin Y 2 (OH) 4.86 Cl 1.44 ·1·07H 2 O (namely YOHCl) nanosheets, to achieve the effective removal of perfluorooctanoic acid (PFOA). YOHCl nanosheets exhibited ultra-high adsorption capacity toward PFOA (up to 957.1 mg/g), which is 1.9 times and 9.3 times higher than the state-of-the-art layered double hydroxides (MgAl-LDH) and benchmark granular activated carbon (GAC) under the same conditions, respectively. Furthermore, YOHCl nanosheets pose stable performance on the removal of PFOA under various water matrices with robust reusability. We also developed YOHCl-based continuous-flow column, demonstrating its promise in simultaneously removing multiple PFAS with wide range of chain lengths at environmentally relevant concentrations. With the molecular-level investigations, we have revealed that multi-mechanism, including ion exchange, electrostatic attraction and bidentate/bridging coordination, contributed to the strong PFOA-YOHCl affinity, leading to the ultra-high adsorption capacity of PFOA. We have provided emerging LRHs-based adsorbents for the effective remediation of PFAS with molecular-level insights on the interfacial mechanisms.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
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