Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 18
·9789-9798
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IF 7.443
Rong He,Weiming Li,Dayi Deng,Wensen Chen,He Li,Chaohai Wei,Youwen Tang
In order to develop a highly efficient method for direct removal of lead from acidic wastewater (pH 2.0), we introduce a novel highly ordered Pb2+ imprinted mesoporous silica (PbIMS) SBA-15 combining co-condensation and functionalized iminodiacetic acid (IDA). Fourier transform infrared spectroscopy (FTIR) and energy-dispersive X-ray (EDX) analysis provided the components of PbIMS. The solid-state 13C NMR spectra demonstrated the successful embedment of IDA in the mesoporous silica. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis confirmed that Pb2+ was coordinated by the N atom and carboxyl O atom of IDA. The results of transmission electron microscopy (TEM), small angle X-ray diffraction (XRD) and N2 adsorption–desorption measurement confirmed that the PbIMS preserved a highly ordered hexagonal P6mm mesostructure. The Brunauer–Emmett–Teller (BET) surface area was 762 m2 g−1. The saturated adsorption capacity of PbIMS toward lead reached up to 103 mg g−1 at pH 2.0, which was greater even than that of the simply modified SBA-15 by IDA at pH 4.5. The values of selectivity coefficients of PbIMS for six competing metal ions ranged from 67.3 to 12.7. The adsorption of Pb2+ reached equilibrium within 7 min. The adsorption efficiency of PbIMS was above 93% after six extraction–stripping cycles. The investigation conducted with real samples of strongly acidic wastewater demonstrated the ability of PbIMS to efficiently remove lead below the current China regulatory standard.
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
Biomass Conversion and Biorefinery
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2022
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IF 4.05
Hou Jingjie,Xia Juntao,Weng Ruoyi,Liu Yiting,Li Luyao,Liu Keyu,Sheng Jie,Song Yishan
Due to their significant differences in physicochemical properties, it is still challenging to remediate complex wastewater containing more than one kind of dyes via convenient adsorption. Herein, rice-husk-extracted mesoporous silicon (RH@MCM-41) was facilely synthesized, systematically characterized, and used as a versatile adsorbent to remediate methylene blue (MB) from simulated textile effluent. The influences of adsorption kinetics, isotherms, thermodynamics, pH, and mixed dyestuff toward MB remediation were studied. Results demonstrated that RH@MCM-41 possessed well MB sorption capacity in the single dyestuff solution with maximum sorption capacity of 213.31 mg/g at Sips model. Moreover, RH@MCM-41 could selectively sequestrate MB from rhodamine B (RB)/MB mixed systems. Interestingly, the sorption capacity of RH@MCM-41 to MB (methyl orange (MO)/MB, acid fuchsin (AF)/MB, and xylenol orange (XO)/MB) were significantly enhanced in mixed system while no obvious MO and AF as well as XO adsorption were detected in its individual system. It was elucidated that the uptake of other dyestuff and MB by RH@MCM-41 were due to the synergistic effects between multiple sorption mechanisms. Therefore, the source of green, simple preparation method, well sorption capacity, removal selectivity, and unique adsorption potential reveal RH@MCM-41 possessed tremendous potential for MB-containing wastewater sequestration in practical applications.
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
Nanomaterials
·
2020
·Vol. 10
·期 4
·686
·
IF 4.324
Linlin Du,Peng Gao,Yuanli Liu,Tsuyoshi Minami,Chuanbai Yu
The removal of Cr(VI) in wastewater plays an important role in human health and environment. In this work, polypyrrole/hollow mesoporous silica particle (PPy/HMSNs) adsorbents have been newly synthesized by in-situ polymerization, which prevent the aggregation of pyrrole in the process of polymerization and exhibit highly selective and powerful adsorption ability for Cr(VI). The adsorption process was in good agreement with the quasi-second-order kinetic model and the Langmuir isotherm model. And the maximum adsorption capacity of Cr(VI) was 322 mg/g at 25 °C. Moreover, the removal rate of Cr(VI) by PPy/HMSNs was ~100% in a number of binary systems, such as Cl−/Cr(VI), NO3−/Cr(VI), SO42−/Cr(VI), Zn2+/Cr(VI), Fe3+/Cr(VI), Sn4+/Cr(VI), and Cu2+/Cr(VI). Thus, the PPy/HMSNs adsorbents have great potential for the removal of Cr(VI) in wastewater.Keywords:polypyrrole/hollow mesoporous silica particle;chromium(Cr);adsorption
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
Journal of Water Process Engineering
·
2025
·
IF 6.7
Yilai Zhong,Zengyuan Li,Jianchun Qin,Wenlong Li,Chunlin He,Lifeng Chen,Xiangbiao Yin,Mohammed F. Hamza,Yuezhou Wei,Shunyan Ning
Recycling rare earth elements (REEs) from NdFeB magnets alleviates the growing demand for these resources and contributes to environmental protection. Phosphate groups are known for their high adsorption selectivity for rare and precious metals. In this study, a novel phosphorus-functionalized silicon-based adsorption material (PPA@APTES/SBA-15) was synthesized using poly (ethylene glycol)- block -poly (propylene glycol)- block -poly (ethylene glycol) copolymer (P123) as a template, tetraethyl orthosilicate (TEOS) as a silicon source, (3-amino-propyl) trimethoxysilane (APTES) as a coupling agent, and phosphite ester as a functional ligand. This material was designed for the adsorption and separation of Nd and Dy from NdFeB leaching simulants. The batch experiments revealed that PPA@APTES/SBA-15 achieved equilibrium separation of Co and REEs within 10 s, with SF REE/Co ≥ 2018.76. The material exhibited near 100 % adsorption efficiency for Nd and Dy in 6 M HCl solution, along with excellent reusability. Notably, column experiments also demonstrated near complete adsorption efficiency for Nd and Dy. SEM-EDS, TEM, XRD, and N 2 adsorption-desorption isotherms confirmed that PPA@APTES/SBA-15 possessed a uniform hexagonal mesoporous structure and a high specific surface area. TG-DSC analysis demonstrated that the organic loading of PPA@APTES/SBA-15 was 9 %. FT-IR, XPS, and DFT analysis suggested that PPA@APTES/SBA-15 bond metal ions via P OH (P O) groups.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Sirui Chen,Guoyuan Xiong,Shuangling Cui,Shufang Zhao,Jilong Lai,Xuening Zhang,Guangyong Zeng,Ying Zeng,Hao Shi
The scarcity of rubidium (Rb) in ore form makes it a valuable metal, prompting the need to develop reusable adsorbent materials for effective separation of rubidium (Rb + ) from salt lake brine, which holds significant importance. Herein, a novel Rb + selective composite adsorbent was prepared by in-pore crystallization. Macromesoporous silica was prepared using polyoxyethylene (10) octadecyl ether (Brij S10) as a templating agent and the effect of different templating agents on the pore size was investigated. An AMP-SiO 2 composite adsorbent for Rb + was obtained by “growing” ammonium phosphomolybdate on the macro-mesoporous silica by in-pore crystallization reaction. The results indicated that the adsorption of Rb + by the AMP-SO 2 adsorbent adhered to monolayer chemisorption , which was verified by fitting the adsorption data using the pseudo-second-order kinetics and the Langmuir isotherm model, respectively. The loading of AMP was 29.4 %, which increased the adsorption capacity by 115 %. Furthermore, the adsorption rate of Rb + on AMP-SO 2 when interfering ions were present still reached 73.2 % (KCl), 76.4 % (CaCl 2 ), and 86.6 % (MgCl 2 ). Density functional theory simulation indicated that AMP-SiO2 exhibited a higher adsorption energy for Rb + (−9.79 eV) than K + , Li + , Ca 2+ , and Mg 2+ . The Rb 3d and Mo 3d X-ray photoelectron spectra of AMP-SiO 2 before and after adsorption of Rb + , indicated that the ion-exchange process between rubidium and lattice cations is the controlling mechanism. In addition, AMP-SiO 2 also showed good regeneration performance and maintained a high adsorption rate after five adsorption-resolution experiments. In summary, the AMP-SiO 2 composite adsorbent can effectively expose adsorption sites and improve mass transfer efficiency, and has significant potential for future application in rubidium separation and extraction.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 35
·20504-20514
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IF 3.119
Jianwen Wei,Siqi Chen,Yu Li,Zeyu He,Linlin Geng,Lei Liao
To find an alternative adsorbent with high adsorption performance, KIT-6 was prepared by hydrothermal crystallization synthesis using tetraethyl orthosilicate as a silicon source and triblock copolymer P123 as a template. Then the silane coupling agent (3-chloropropyl)trimethoxysilane was first grafted onto KIT-6 mesoporous material and then the polyethyleneimine (PEI) was further grafted through the substitution reaction between amino groups and chlorine atoms. The functionalized KIT-6 was denoted as PEI/KIT-6. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 adsorption–desorption, elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR) and thermal gravimetric analysis (TGA). The Cu2+ adsorption performance was determined by inductively coupled plasma (ICP). The results showed that the average loading of the amino groups was 3.74 mmol g−1, and the modified KIT-6 still has a stable mesoporous structure without pore blockage. With the dosage of 1 g L−1 PEI/KIT-6 and at room temperature, the optimum pH value for adsorption of 100 mg L−1 Cu2+ was 6.0. The adsorption capacity of PEI/KIT-6 for Cu2+ increased with the increase of reaction temperature, and the maximum adsorption capacity of Cu2+ was 36.43 mg g−1. The adsorption capacity tends to reach equilibrium after 120 min, and the optimum adsorption temperature was 35 °C. The pseudo-second-order kinetic model was found to be well suited for the adsorption process of Cu2+. Adsorption equilibrium data could also be described well by the classical Langmuir and Freundlich isotherm models. The adsorption tends to be the chemisorption of a monolayer.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 11
·3429
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IF 4.927
Yilan Chen,Junjie Wu,Xin Wang,Minyi Liu,Yamin Liu
An efficient CO2adsorbent with a hierarchically micro-mesoporous structure and a large number of amine groups was fabricated by a two-step synthesis technique. Its structural properties, surface groups, thermal stability and CO2adsorption performance were fully investigated. The analysis results show that the prepared CO2adsorbent has a specific hierarchically micro-mesoporous structure and highly uniformly dispersed amine groups that are favorable for the adsorption of CO2. At the same time, the CO2adsorption capacity of the prepared adsorbent can reach a maximum of 3.32 mmol-CO2/g-adsorbent in the actual flue gas temperature range of 303–343 K. In addition, the kinetic analysis results indicate that both the adsorption process and the desorption process have rapid adsorption/desorption rates. Finally, the fitting of the CO2adsorption/desorption experimental data by Avrami’s fractional kinetic model shows that the CO2adsorption rate is mainly controlled by the intra-particle diffusion rate, and the temperature has little effect on the adsorption rate.Keywords:CO2adsorbent;hierarchically micro-mesoporous silicon;amine-functionalized;kinetic
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 79
·76064-76074
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IF 3.289
Saifu Long,Shijian Zhou,Fu Yang,Kangchao Lu,Tao Xi,Yan Kong
Surface exposed catalytic active species are thought to be responsible for overall catalytic activity and selectivity. In this paper, controllable contents of iron oxides were in situ introduced into the inner surface of anionic surfactant-templated mesoporous silica (AMS) by the metal-modified anionic surfactant templating route, in which anionic micelles decorated with different amounts of Fe2+ were direct utilized to assemble with organosilicate. The characterization results demonstrated that, after thermal treatments, Fe2O3 species were in situ formed and highly-dispersed in the channels of AMS, and the pore size was accordingly tailored to the microporous level (<2 nm). In each AMS catalyst, Fe2O3 showed better dispersion and stability compared with the post-impregnated method. Moreover, the catalytic performances of phenol hydroxylation on the as-synthesized catalysts were significantly enhanced, and the optimal catalyst (Fe/Si = 3.5 wt%) gave a phenol conversion of 44.3% with a selectivity of 82.6% to dihydroxybenzene. By comparison with some reference mesoporous silica catalysts (0.15Fe/MCM-41 and 0.15Fe/SBA-15), the iron-based micropore-enriched silica catalyst (Fe/AMS) gave an obviously higher selectivity to dihydroxybenzene. Finally, the optimal catalyst was examined for at least 5 runs in phenol hydroxylation.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 9
·3506
·
IF 3.4
Cheng Chen,Chaoyi Chen,Junqi Li,Gangan Wang,Xin Lin,Deyang Ning
By utilizing low-grade bauxite desilication solution as raw material and adding lime after thermal reaction, adsorbent MCS was synthesized. X-ray diffraction, Brunauer–Emmett–Teller, Fourier transform infrared spectroscopy, and scanning electron microscopy were used to characterize the MCS, MCS-Pb, and MCS-Cu. The Freundlich model was found to be more suitable for isothermal adsorption, suggesting that the adsorption of Cu2+and Pb2+by MCS is not limited to monolayer adsorption. According to the results of the experiment, the maximum adsorption capacities of lead ion and copper ion were found to be Pb2+(1921.506 mg/g) > Cu2+(561.885 mg/g), and the adsorption was controlled by chemical reactions following pseudo-second-order kinetics. Electrolyte study results indicated that the presence of background electrolyte did not affect the adsorption of Cu2+and Pb2+by MCS.Keywords:calcium mesoporous silicate;heavy metal;low grade bauxite;adsorption
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
PubMed
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2024
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IF 5.6
Jiawen Chi,Xueqian Wu,Jiangyan Tao,Xin Min,Zhen Li,Songjian Zhao
Climate warming caused by the yearly rise of CO 2 emissions has posed a great challenge to the survival and development of human beings. In this study, the active component Ni was combined with mesoporous silica (SiO 2 ) to construct a highly dispersed Ni composite silicon-based catalyst (Ni x /Si), which was introduced into the dielectric barrier discharge (DBD) system for the conversion of CO 2 . The XRD and FTIR analyses confirmed that Ni was successfully introduced into the SiO 2 carrier and the SEM results showed that the Ni elements were uniformly distributed. BET and TGA results revealed large specific surface area, stable mesoporous structure, and high thermal stability of the prepared Nix/Si. Further investigation of DBD-coupled Ni x /Si performance for CO 2 conversion showed significant variations based on different Ni loadings, with optimal CO 2 conversion rate, CO yield, and energy efficiency achieved at 3% Ni loading, which increased by 121.8%, 101.5%, and 102.4% respectively compared to the SiO 2 support. During the process of reducing CO 2 , the combination of Ni x /Si and DBD exhibited synergistic effects, with Ni 0 playing a crucial role in the CO 2 reduction. The introduction of Ni x /Si enhances charge transfer in the discharge region, improves CO 2 adsorption, and reduces the dissociation energy of CO 2 bonds. The DBD-coupled Ni x /Si developed by this study offers several advantages including low energy consumption, simple operation, and high efficiency, making it a promising solution for CO 2 treatment.
研究领域:
环境科学
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催化化学
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DOI
高影响因子
Chemical Engineering Journal Advances
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2021
·
IF 0
Bing Li,Qiang Xue,Yong Wan,Lin Liu,Junhua Fu,Yitao Yu,Feng Wang,Jinhui Li,Fangzhi Zhang,Shuo Zhang,Zhenhua Wang,Ning Zhao
Water deterioration and eutrophication caused by phosphorus (P) contamination necessitates P removal from polluted water, and has been a research focus since the second half of last century. In this study, novel mesoporous micropheres based on silicon and calcium (Ca) was prepared as an adsorbent by direct pyrolysis to enrich and remove P. The maximum adsorption capacities of the prepared adsorbents were 356.34 and 496.73 mg g −1 P−PO 4 3− for potassium phosphate (K 3 PO 4 ) and potassium dihydrogen phosphate (KH 2 PO 4 ) solutions, respectively, and adsorption equilibrium was attained rapidly in less than 30 min. The Langmuir isotherm and pseudo-second-order kinetic model adequately fit the adsorption process for K 3 PO 4 solution, while the Langmuir isotherm and pseudo-first-order kinetic appropriately fit the KH 2 PO 4 solution. The adsorption of P was due to the reaction between Ca 2+ and PO 4 3− , forming different phosphates. Addition of interfering ions had no significant effect on the adsorption ability of the prepared adsorbents. The proposed adsorbent was successfully applied to remove P from real wastewater. Notably, this new Ca-modified mesoporous silicon micropheres is an excellent adsorbent for treating wastewater containing low P content, providing an effective approach for facile preparation of P adsorbents and exhibiting promising P removal from wastewater.
研究领域:
环境科学
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材料科学
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DOI
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 5
·1257-1267
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IF 3.146
Cheng Liang,Zhang Li,Wang Hongxia,Song Fangxiang
Mesoporous silica (MS) and graphene oxide (GO) are good absorbents. Combining them not only prevents GO agglomeration but increases the number of MS active sites. In addition, their composites can preferentially adsorb specific pollutants after modification. In this work, amino-modified GO/MS materials were prepared by post-grafting to remove Congo red (CR) and Cr(VI) in solution. Characterization methods, such as X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Zeta potential, and N 2 adsorption/desorption, were adopted. The prepared GO/MS@HBP has a porous structure with a specific surface area of 49.32 m 2 ·g −1 . The effect of initial concentration, pH, adsorption time, temperature and other ions was determined on the adsorption amount. Relying on this, the GO/MS@HBP maximum capacity for Cr(VI) and CR adsorption are 93.73±2.3% and 257.69+1.5% mg·g −1 , respectively. Pseudo-second-order kinetic and Langmuir isotherms are more suitable to describe the adsorption process, indicating that chemical adsorption plays a major role in the entire adsorption process. Thermodynamics showed that the enthalpy (H) of materials adsorbing two pollutants was positive and that the Gibbs free energy (G) was negative, suggesting that Cr(VI) and CR adsorption on GO/MS@HBP was spontaneously endothermic. GO/MS@HBP could simultaneously remove CR and Cr(VI) in solution, and be an effective adsorbent for removing harmful substances.
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
危险品化学品经营许可证（带存储）