MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Zhenhua Dang,Mingming Jia,Jun Liao,Yong Zhang,Wenkun Zhu
Al 2 O 3 aerogels have been synthesized by in situ water formation method using different agents including phenylenediamine, aniline, thiourea and urea for in-situ water formation. Then, various of techniques were implemented to analyze the structure of these as-prepared Al 2 O 3 aerogels. The results showed that the Al 2 O 3 –Th possessed the uniform porous morphology, which might provide the large specific surface area and a large number of active sites to dislodge U(VI) species. Additionally, the adsorption properties of the as-prepared Al 2 O 3 aerogels to U(VI) from solution were investigated. It could be concluded that the removal of U(VI) on Al 2 O 3 aerogels were independent on ionic strength and strongly reliant on the initial pH. The adsorption isotherms of Al 2 O 3 –Th to U(VI) could be imitated using the Langmuir model and the maximum adsorption capacities in simulated seawater and aqueous solution were 270.9 and 634.0 mg/g, respectively, which showed that the adsorption property of Al 2 O 3 –Th was much better than that of other reported Al 2 O 3 -based adsorbents. In addition, the adsorption efficiency of Al 2 O 3 –Th reached 70% within 5 min and the equilibrium of U(VI) adsorption was achieved within 100 min ( C 0 = 10 mg/L). Meanwhile, the adsorption efficiency of Al 2 O 3 –Th to U(VI) maintained quite good and the value still reached about 93% after five consecutive cycles. These results indicated that the Al 2 O 3 aerogels would be applied as potential materials for wastewater treatment .
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
WATER RESEARCH
·
2014
·
IF 5.323
Zhibin Wu,Hua Zhong,Xingzhong Yuan,Hou Wang,Lele Wang,Xiaohong Chen,Guangming Zeng,Yan Wu
In this article, a rhamnolipid-functionalized graphene oxide (RL-GO) hybrid was prepared by one-step ultrasonication and adsorptive removal of methylene blue (MB) from both artificial and real wastewater by the RL-GO was investigated. The Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) area and Zeta potential analysis were used to characterize the adsorbent. The results showed that RL-GO had abundant functional groups and a mesopores feature. MB adsorption by the RL-GO increased with increase in adsorbent dose, pH, temperature and initial MB concentration, while it was insensitive to ionic strength variation. The adsorption kinetics fitted well to the pseudo-second-order model with correlation coefficients greater than 0.999. The Intra-particle diffusion and Boyd's film-diffusion models showed that the rate-controlled step was dominated by film-diffusion in the beginning and then followed by intra-particle diffusion. The adsorption isotherm was fitted by adsorption models with the suitability in order of BET > Freundlich > Langmuir > Temkin, based on comparison between correlation coefficients. Thermodynamic analysis of equilibriums suggested that the adsorption MB on RL-GO was spontaneous and endothermic. The adsorption mechanism was also proposed to be electrostatic attraction, π–π interaction and hydrogen bond . In addition, the real wastewater experiment, the regeneration study and the comparative cost analysis showed that the RL-GO composites could be a cost-effective and promising sorbent for MB wastewater treatment owing to its high efficiency and excellent reusability.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
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IF 1.835
Dezhi Yang,Lingbing Qiu,Yaling Yang
Glutaraldehyde cross-linked chitosan-coated Fe3O4 nanocomposites (MCNPs) were successfully synthesized for the removal of methyl orange (MO) from wastewater. Experimental conditions such as the pH, cation surfactant dosage, nanoadsorbent dosage, and ionic strength were also investigated. Kinetics date was better fit by a pseudo-second-order model, indicating that adsorption was the rate-limiting step. The Freundlich models (R2 = 0.9794) fit the experimental data better than the Langmuir models, and the theoretical maximum adsorption capacity was 758 mg g–1. The values of the Gibbs free energy (ΔG° = −7.27 kJ mol–1), enthalpy (ΔH° = 0.001 kJ mol–1), and entropy (ΔS° = 23.58 J mol–1) indicated the spontaneous and endothermic process of MO adsorption. The prepared MCNPs showed 96–98% adsorption of MO by adding 0.2 mg of cationic surfactant cetyltrimethylammonium bromide (CTAB) to form mixed hemimicelles and can be easily regenerated with a 0.1 mol L–1 HCl solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2021
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IF 3.512
Fengxiao Zhao,Rui Shan,Wenjian Li,Yuyuan Zhang,Haoran Yuan,Yong Chen
In this study, pulp sludge-derived biochar synthesized through modification with ZnCl2 under multistep pyrolysis conditions was investigated for the effective removal of methylene blue (MB) from aqueous solution. Results showed that when the Zn2PT350-700 dosage was 10 mg, the largest adsorption amount of MB was 590.20 mg/g within 24 h under pH = 8. Kinetics and thermodynamics revealed that the adsorption process of MB can be described by the Freundlich isotherm model and the pseudo-second-order kinetic model, which means that multilayer sorption occurred on the heterogeneous surface of Zn2PT350-700. The analysis of the adsorption mechanism showed that electrostatic attraction between the deprotonated functional groups and MB+, cation exchange, and π-electron interaction played a major role in MB adsorption, followed by physical adsorption. After six cycles of desorption–adsorption, Zn2PT350-700 still maintained good adsorption performance. All results demonstrated that Zn2PT350-700 could perform as promising adsorbents for efficient MB removal from wastewater. Using biochar from paper and pulp sludge for wastewater remediation is an ingenious method, which can reduce the environmental and health risks related to industrial waste disposal, while providing remediation of water contaminated with industrial dye effluents.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2022
·Vol. 45
·期 6
·3331-3344
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IF 4.898
Li Xinyue,Jiang Yanyan,Chen Tianya,Zhao Pan,Niu Sen,Yuan Muzi,Ma Xiulan
The type of feedstock and pyrolysis temperature are the main reasons affecting the properties of the resulting biochar. Therefore, this paper investigates the effects of different feedstocks (peanut shell, corn straw and soybean straw) and different pyrolysis temperatures (300, 450 and 600 ℃) on the structural morphology and elemental composition of the resulting biochar. The optimum pyrolysis temperature of 600 ℃ was selected based on the comparison of the adsorption of NFX (norfloxacin) by the biochar prepared at different temperatures. Characterization of biochar materials using x-ray diffractometer, fourier transform infrared spectrometer and scanning electron microscope to study the changes in the physicochemical and structural properties of biochar. The results showed that the pH, surface area and ash content of biochar are increased with increasing temperature. The results of isothermal adsorption and adsorption kinetics experiments showed that the adsorption processes of the three biochar species on NFX were consistent with the Langmuir model and Pseudo-second order kinetic model. The adsorption process occurred in the surface layer of the biochar and was dominated by chemisorption. The inhibition of the adsorption of NFX was more obvious with the higher valence state of cations and the higher ion concentration. The adsorption mechanism of biochar on NFX includes pore filling, hydrogen bonding and electrostatic interactions.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Pei Dong,Kaixuan Huo,Xiubiao Ma,Xiaolin Ma,Yingying Gu,Mingjie Lu,Jinqiang Zhang,Yang Wang,Chaocheng Zhao
The utilization of renewable carbon resources (waste biomass) and the study of metal-free active components have received much attention in the field of catalysis, also showing great development potential for the preparation of electro-Fenton (EF) electrode material toward the efficient wastewater remediation, but there are still many challenges in the revelation of microstructures regulation and EF catalytic mechanism induced by biochar and metal-free active sites. So, in this work, the monolithic biomass-derived electrode (N,P-C/B 3 C) was prepared by a simple and green strategy, in which the biochar derived from waste bagasse and the heteroatom N, P acted as the carbon-based precursor and the metal-free active sites, respectively. The regulation of electrode microstructure induced by different raw materials was explored. The catalytic performance, stability, energy consumption, toxicity analysis, and organic degradation path in this N,P-C/B 3 C-EF system were investigated in detail by treating simulated wastewater and real pharmaceutical wastewater, respectively. According to experiments, characterization analysis, and density functional theory (DFT) calculation, the enhanced EF reaction mechanism by the synergistic effect of N,P co-coped sites in carbon matrix was revealed, where Prr N-P and Gra N-P structures may be the suitable sites for 2e - ORR process, accelerating the O 2 adsorption and breaking the *–OOH bond to form H 2 O 2 . Significantly, Prr N-P possesses the most powerful thermodynamics and the lowest energy barrier toward the rate-determining step (conversion of·H 2 O 2 ), being the superior active site for H 2 O 2 adsorption and activation to produce strongly oxidizing ROS.
研究领域:
环境科学
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催化材料
·
废水处理
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Gao Yang,Gao Shan,Zhang Yunhua,Lyu Shaoyi,Wang Feijun
Reuse of dye-containing wastewater for valuable products offers significant potential. Chitosan, a natural high-molecular-weight porous material, served as an effective carrier for dye molecules. This study uses chitosan to adsorb Congo Red, preparing hierarchical porous carbon materials, which are then applied in supercapacitors. The findings reveal that chitosan achieves an impressive adsorption capacity of 1450 mg g −1 for Congo Red. When the chitosan–Congo Red composite material-based carbon is used as the electrode material, it shows an outstanding specific capacitance of 318 F g −1 at a current density of 1 A g −1 . Furthermore, due to its high content of heteroatoms such as N, O, and S, the double-layer supercapacitor fabricated with this electrode material demonstrates a specific capacitance of 149.49 F g −1 at 1 A g −1 , with an energy density of 8.77 Wh kg −1 at a power density of 335.35 W kg −1 . These results highlight the considerable potential of this material after adsorption of dye-containing wastewater for applications in the energy storage field.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaolei Shi,Weibin Ma,Wei Chen,Xuan Tao,Chunxiao Gong,Shuai Gao,Lujiang Xu,Zhen Fang
Phenol is a typical toxic and persistent pollutant in wastewater, requiring efficient and recyclable adsorbents for its removal. In this study, Fe–N co-doped biochar was synthesized through four preparation routes combining KOH activation and FeCl 3 -NH 3 modification, and its phenol adsorption behavior and formation mechanism were systematically investigated. The biochar exhibited specific surface areas of 400–900 m 2 /g and N contents of 1.85–3.92 at.%, enabling the formation of Fe 2 O 3 , Fe 3 O 4 , and Fe-N x species. Among the samples, the biochar prepared at 800 °C via activation and soaking–drying achieved the highest phenol adsorption capacity (263.09 mg/g). Adsorption followed the Freundlich isotherm and pseudo-second-order kinetic model, indicating multilayer chemical adsorption. Cycling experiments revealed that Fe 2 O 3 and Fe 3 O 4 were easily detached, whereas Fe-N x remained stable, maintaining 76 % adsorption capacity after five cycles. DFT calculations further confirmed the strong anchoring of Fe ions by N-doped micropores and the thermodynamic stability of Fe-N x structures. This work demonstrates a simple and effective approach for preparing stable Fe-N biochar and provides mechanistic insight into its enhanced phenol adsorption.
✓ 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）