RSC Advances
·
2019
·Vol. 9
·期 46
·26676-26684
·
IF 3.049
Qinghao Wu,Dawei Liang,Xiumei Ma,Shanfu Lu,Yan Xiang
Capacitive deionization (CDI) is a novel low-energy green desalination technology that has attracted much attention in recent years, especially for the desalination of low salinity water. One of the key issues in CDI is the electrode materials, and many efforts have been devoted to developing materials with high specific surface areas, appropriate pore distributions, and good electronic conductivity, in order to obtain a high salt adsorption capacity. In this study, chitosan was selected as a precursor for the preparation of high-performance chitosan-based activated carbon (CTS-AC) for use in CDI electrodes via pyrolysis and KOH activation. The results show that CTS-AC800 (activated at 800 °C) has the largest BET specific surface area (2727 m2 g−1), and exhibits an appropriate pore size distribution (<10 nm), nitrogen doping (2.0%) and good electronic conductivity (2.09 S cm−1). The CDI performance results show that the CTS-AC800 electrode has a saturated salt adsorption capacity of 14.12 mg g−1 in a 500 mg L−1 NaCl solution and retains 95% capacity after 150 adsorption–desorption cycles. Thus, chitosan is a promising, sustainable precursor for CDI electrode materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Guotai Zhang,Jingze Zhang,Yuan Zhou,Guicai Qi,Yongmin Wu,Chunxi Hai,Weiping Tang
Al-doped lithium manganese oxides Li 1.6 Al x Mn 1.6- x O 4 were successfully prepared by sol–gel synthesis and solid state reactions . Protonated samples were obtained by further acid treatment. Experiments were performed to study the effects of physical properties including the Al 3+ doping content x and calcination temperature for optimizing the synthesis of H 1.6 Al x Mn 1.6-x O 4 ion-sieve pursing nice performance such as enlarging the adsorption capacity and minimizing dissolution loss of manganese. The characteristics of a series of Al-doped ion-sieve were studied by XRD , SEM and EDS . The crystal structure was kept well after Al doping from XRD analysis. SEM and EDS showed that Al was uniformly distributed in the sample. The valence state of Mn in Al-doped ion-sieve precursor was analyzed by XPS . Adsorption/desorption experiments were carried out to evaluate the amounts of lithium extraction, lithium adsorption capacity and the manganese and aluminum dissolution loss of the ion-sieve. The results showed that the Al-doped H 1.6 Mn 1.6 O 4 ion-sieve exhibited higher absorption capacity (which approached 32.6 mg g −1 while the undoped one reached only 27.6 mg g −1 ). Furthermore, the dissolution loss of manganese and aluminum from the Al-doped ion-sieve were the most impressive among the ones. Importantly, the Al-doped ion-sieve still preserve a high adsorption capacity (26.8 mg g −1 ) and pretty low manganese dissolution loss (1.92%) after performing up to 4 cycles of adsorption/desorption experiments, indicating an enhanced stability of the Al-doped H 1.6 Mn 1.6 O 4 ion-sieve.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Naicai Xu,Zhong Liu,Yaping Dong,Tianzeng Hong,Li Dang,Wu Li
Gamma phase of mesoporous alumina (MA) with large surface area was successfully synthesized by a facile hydrothermal method followed by thermal treatment for fluoride removal. The as-synthesized MA nanoparticles with average size of 20 nm–150 nm have ordered wormhole-like mesoporous structure. The pore size is 5 nm with a narrow distribution, and the specific surface area reaches 357 m 2 g −1 while the bulk density is 0.45 cm 3 g −1 . Glucose as a small-molecule template plays an important role on the morphology, surface area and pore diameter of the MA. As an ionic adsorbent for fluoride removal, the maximum adsorption capacity of MA is 8.25 mg g −1 , and the remove efficiency reaches 90% in several minutes at pH of 3. The Langmuir equilibrium model is found to be suitable for describing the fluoride sorption on MA and the adsorption behavior follows the pseudo-second-order equation well with a correlation coefficient larger than 0.99. The larger surface area and relatively narrow pore size of MA are believed to be responsible for improving the adsorption efficiency for fluoride in aqueous solution.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 6
·
IF 2.504
Youning Chen,Wei Zhao,Huan Wang,Xiaohua Meng,Linjie Zhang
A novel polyamine-type starch/glycidyl methacrylate (GMA) copolymer with a high capacity for the adsorption of heavy metal ions was prepared via graft copolymerization of GMA and corn starch and a subsequent amination reaction between amino group of diethylenetriamine and epoxy group in GMA. The copolymers were characterized by Fourier transform infrared spectrometry, X-ray diffraction and scanning electron microscopy, and adsorption properties on modified starch of Cu(II), Pb(II), Cd(II) and Cr(III) were studied. By analysing the relationship between adsorption capacity and pH, adsorption isotherms and adsorption kinetics, it is proved that the adsorption of the four metal ions is mainly based on the chemical adsorption of coordination. The maximum adsorption capacities of the copolymer were up to 2.33, 1.25, 0.83 and 0.56 mmol g−1 for Cu(II), Pb(II), Cd(II) and Cr(III), respectively. The adsorption of the four concerned metal ions was hardly affected by common coexisting ions such as Na(I), K(I), Ca(II) and Mg(II), whereas it was slightly decreased when Fe(II) and Zn(II) coexisted in the solution, which illustrates the selective adsorption of Cu(II), Pb(II), Cd(II) and Cr(III) from wastewater. After 10 cycles of adsorption–desorption experiments, there was no significant change in the adsorption capacity, indicating that the polyamine-type starch/GMA copolymer has high adsorption capacity and good reusability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2021
·Vol. 68
·期 3
·e17551
·
IF 3.993
Shi Tu,Liang Yu,Ying Wu,Yongwei Chen,Houxiao Wu,Liuqing Wang,Baoyu Liu,Xin Zhou,Jing Xiao,Qibin Xia
Developing energy-efficient alternatives for propylene (C 3 H 6 ) and propane (C 3 H 8 ) separation is of great significance and challenge in the petrochemical industry. Herein, we report the rational design of a new yttrium-based ultramicroporous metal–organic framework (MOF) comprised of 12-connected hexanuclear [Y 6 (OH) 8 (COO) 12 ] 2− cluster and 5-(3,5-dicarboxybenzoylamino)isophthalic acid (H 4 dbai) with ftw topology. It possesses a suitable pore window size and a relatively large pore volume for molecular sieving separation of C 3 H 8 from C 3 H 6 with a high C 3 H 6 capacity. At 298 K and 100 kPa, the adsorption capacity of C 3 H 6 was 2.57 mmol/g, which is the highest among the reported C 3 H 6 /C 3 H 8 molecular sieving MOF adsorbents. The molecular simulation revealed that the steric hindrance effect together with the electrostatic interaction of the oxygen sites in the window resulted in the molecular sieving separation of C 3 H 6 /C 3 H 8 . The breakthrough experiments confirmed its excellent separation performance under dynamic conditions to produce high purity (97.1%) of C 3 H 6 with a working adsorption capacity of 1.75 mmol/g.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Z.W. Zhu,Q.R. Zheng
Comparisons were made between the samples mechanochemically (MOF-5(M)) and solvothermally (MOF-5(S)) prepared for the development of efficient hydrogen storage medium. Synthesized samples were undergone structural characterization as well as adsorption equilibrium measurements of hydrogen at temperature-pressure range 77 K–87 K and 0.1–10 MPa. Grand Canonical Monte Carlo (GCMC) simulations were further conducted to study the behaviors of hydrogen molecules adsorbed on MOF-5. It shows that, besides the advantage of large scale synthesis and a lower cost, mechanochemical method respectively brings about 207% and 90.5% increments in the specific surface area and the maximum excess adsorption capacity of hydrogen at 77 K within pressure range 0–10 MPa. Results also reveal that the crystal within MOF-5(M) is regular and distributing uniformly with a mean size only one tenth of that of the MOF-5(S); at 77 K within pressure range 0–10 MPa, Toth equation can predict the adsorption equilibrium data of hydrogen on two MOF-5 samples with a mean relative error less than 1.5%. It suggests that MOF-5(M) is more promising for hydrogen storage by adsorption for practical applications.
研究领域:
材料科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2023
·Vol. 46
·期 17
·2300206
·
IF 3.1
Haiping Wang,Hongwei Wang,Qingyan Bai,Yunjia Xu,Chunmiao Bo,Bolin Gong
The addition of bisphenol A has been frequently used in industrial manufacturing because it imparts plastic products with characteristics such as transparency, durability, and excellent impact resistance. However, its widespread use raises concerns about potential leakage into the surrounding environment, which poses a significant risk to human health. In this study, molecularly imprinted polymers with specific recognition of bisphenol A were synthesized through surface-initiated atom transfer radical polymerization using poly(glycidyl methacrylate- co -ethylene glycol dimethacrylate) as the substrate, bisphenol A as the template molecule, 4-vinylpyridine as the monomer, and ethylene glycol dimethacrylate as the cross-linker. The bisphenol A adsorption capacity was experimentally investigated, and the kinetic analysis of the molecularly imprinted polymers produced an adsorption equilibrium time of 25 min, which is consistent with the pseudo-second-order kinetic model. The results of the static adsorption experiments exhibited consistency with the Langmuir adsorption model, revealing a maximum adsorption capacity of 387.2 μmol/g. The analysis of molecularly imprinted polymers-enriched actual samples using high-performance liquid chromatography demonstrated excellent selectivity for bisphenol A, with a linear range showing 93.4%–99.7% recovery and 1.1%–6.4% relative standard deviation, demonstrating its high potential for practical bisphenol A detection and enrichment applications.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Enchao Wang,Li Chen,Xinmiao He,Yucheng Xiang,Shuangyi Jia,Yisheng Chen,Zhongxiang Guo,Junyi Luo,Hui Dan,Yi Ding,Tao Duan
The development of Bi-based composites with low cost, high adsorption capacity and retention is highly desired for iodine gas capture. Herein, three novel Bi-based composites (Bi 0 -SiO 2 , Bi 0 -C/SiO 2 and Bi 0 -C) were prepared by simple sintering process using rice husk as C and SiO 2 sources and applied for iodine gas capture. The results demonstrated that the type of support strongly affected the iodine adsorption and retention. The Bi 0 -SiO 2 , Bi 0 -C/SiO 2 and Bi 0 -C composites exhibited the iodine adsorption capacity of 812, 911 and 1334 mg/g, and the iodine retention ratio of 90.9, 86.9 and 65.4%. The Bi 0 -SiO 2 showed the highest iodine retention because the SiO 2 supports have no affinity for iodine and the adsorption mainly came from the chemical adsorption of Bi 0 (2Bi + 3I 2 = 2BiI 3 ). While the Bi 0 -C exhibited the highest adsorption capacity due to the synergistic adsorption effect between C supports and Bi 0 sites. Except for the chemical reaction, charge transfer between C and I (C-I) also contributed to the iodine adsorption. The results demonstrated that the new Bi-based composites would be promising iodine gas adsorbent and the new strategy could be extended to the development of other adsorbents.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Markos Medhin Ashebo,Ningning Liu,Fei Yu,Jie Ma
MXene, show a promising electrode material for capacitive deionization (CDI) due to their elevated conductivity and hydrophilic surface characteristics. Despite optimal electrochemical reaction conditions, MXene still exhibits unsatisfactory capacity. Enhancing capacitance in Nb 2 CT x MXene poses a key challenge, and addressing this involves leveraging pseudocapacitance through increased active site concentration. This study reports a method to notably improve the capacitance by incorporating cation intercalation and surface modification. After alkali treatment and thermal annealing, the obtained 400-KOH-Nb 2 C as a cathode in capacitive deionization, exhibiting notable salt adsorption capacity of 104.2 mg g −1 at 1.6 V and an efficient removal rate of 1.73 mg g −1 min −1 , cyclic stability maintained over 200 cycles. This optimized electrochemical and desalination performance is due to the large interlayer spaces of Nb 2 CT x and the surface with lowest termination of -F and –OH group, promoting the delicate surface of Nb 2 CT x MXene and accelerating ion transport. Furthermore, the derivation of KNbO 3 nanowires on 400-KOH-Nb 2 C surface further expands the layer spacing of MXene and enhances the active sites, and also acts as a protective layer to improve the stability of Nb 2 C, this effectively addressing challenges associated with desalination. This study offers a novel solution for improving Nb 2 CT x MXene electrochemical properties in CDI.
研究领域:
材料科学
·
环境工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhenfei Wang,Congli Li,Lei Tang,Jiahui Yang,Qi Shi,Jinxiang Dong
Ni-MOF-74 is among the most promising candidates for CO adsorption due to its highest CO adsorption capacity. However, the feasibility of using Ni-MOF-74 in actual CO/N2 pressure swing adsorption (PSA) processing cannot be reliably inferred based solely on its adsorption capacity at normal temperature and pressure. Hence, we systematically studied its CO working capacity and regenerability at different test temperatures and pressure ranges by single-component static and binary-component dynamic (CO/N2, 50%/50% and 30%/70%, v/v) experiments. The static experiments preliminarily indicated an appropriate operating temperature of 100 °C with adsorption–desorption pressures in the range of 3.0–0.1 bar for the PSA process. The working capacity and regenerability of CO were evaluated as 3.41 mmol·g–1 and 66.21% (adsorption–desorption pressure: 3.0–0.1 bar, 100 °C). A higher temperature reduces the binding force between CO and Ni-MOF-74, so that more CO is desorbed, which leads to an increase in the working capacity and regenerability of CO. Furthermore, through CO/N2 binary-component dynamic breakthrough experiments, the optimal operating temperature and CO adsorption partial pressure for the PSA process were determined as 100 °C and 1.5 bar at a total desorption pressure of 0.2 bar. Typically, for a CO/N2 composition of 50%/50%, the CO working capacity and regenerability were 2.66 mmol·g–1 and 85.25% at 100 °C and a CO partial pressure of 1.5 bar (total CO adsorption pressure of 3.0 bar) at a total desorption pressure of 0.2 bar. These results may guide PSA process design and optimization for adsorbents with strong CO binding ability.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 39
·28320-28331
·
IF 3.9
Linjie Yi,Hongwei Wang,Xianliang Ren,GaoBin Liu,Hongen Nian,Zhiqin Zheng,Fang Wu
Structural modification is expected to be a facile way to enhance the adsorption performance of MXene. In this work, the structural modification of Ti3C2Tx was carried out by a spray freezing method, and two kinds of nano-structure (spherical and flaky) of Ti3C2Tx were prepared by adjusting the solution concentration of Ti3C2Tx. Then the Cr(VI) adsorption capacity and removal efficiency of the spherical and flaky Ti3C2Tx was investigated, respectively. It is found that flaky Ti3C2Tx was produced with a Ti3C2Tx concentration of 3 mg mL−1, while spherical Ti3C2Tx was obtained with a concentration of 6 mg mL−1. The long diameter of flaky Ti3C2Tx is about 8–10 μm, and the specific surface area is 17.81 m2 g−1. While spherical Ti3C2Tx had a diameter of about 1–4 μm and a specific surface area of 17.07 m2 g−1. The optimized structure of flaky and spherical Ti3C2Tx improves the maximum adsorption capacity by 97% and 33%, respectively, compared with the few-layer Ti3C2Tx. The maximum adsorption capacity of flaky Ti3C2Tx was 928 mg g−1, while that of spherical Ti3C2Tx was 626 mg g−1. The adsorption capacity of both Ti3C2Tx structures decreased with the increase of pH, and reached the maximum value at pH = 2; meanwhile, the adsorption capacity of both Ti3C2Tx structures increased with the increase of Cr(VI) concentration. The adsorption of Cr(VI) on flaky Ti3C2Tx was very fast, reaching equilibrium in 3 min, while spherical Ti3C2Tx took 5 min. The adsorption of Cr(VI) on both Ti3C2Tx structures belonged to the monolayers, heat-absorbing chemical adsorption, and the diffusion process of Cr(VI) was regulated by the external diffusion and internal diffusion of particles. Its adsorption mechanism was the combination of reductive adsorption and electrostatic adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Guo Dingge,Xiao Jing,Ning Yang,Yu Hongchao,Jin Tianxiang,Huang Bin,Qian Yong
The efficient removal of thorium from the environment is critical due to the risks it poses to organisms. Metal–organic frameworks are favored by scholars because of their potential to effectively adsorb a variety of heavy metal ions in wastewater treatment. In this work, the interaction of UiO-66-NH 2 surface with graphene, enhances adsorption capacity of MOFs. Optimal adsorption conditions have been identified, and a detailed adsorption mechanism has also been comprehensively discussed. The theoretical maximum adsorption capacity exhibited by UiO-66-GO is 119.57 mg g −1 . Moreover, it shows a fast adsorption rate and reached equilibrium within 20 min. The development of materials with good adsorption performance and fast adsorption for Th(IV) plays an important role in the development of Th(IV) adsorption in the future.
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
危险品化学品经营许可证（带存储）