JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Xueli Zhang,Yan Sun,Wei Su,Xueyuan Wang
As a new kind of adsorbent, graphene sheets (GS) possess large surface areas and excellent adsorption properties. To investigate the adsorption equilibria of C1–C4 from natural gas on GS and fit the isotherms by the Langmuir–Freundlich equation. GS were synthesized with a specific surface area of 805 m2/g and a specific pore volume of 1.03 cm3/g. The adsorption isotherms were measured using a volumetric method at five different temperatures between 263.15 and 303.15 K and at pressures of 0–6 MPa for CH4, 0–1.6 MPa for C2H6, 0–0.3 MPa for C3H8, and 0–0.05 MPa for C4H10. It was shown that, for all four hydrocarbons, the amount of adsorption decreased gradually as the temperature increased. The isotherms were described well by the Langmuir–Freundlich equation. The isosteric heat of adsorption values decreased in the order C4H10 > C3H8 > C2H6 > CH4 which was consistent with those of the extreme heats of adsorption. This suggests that the adsorption capacities of C1–C4 on GS decreased in the order C4H10 > C3H8 > C2H6 > CH4.
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
ACS Omega
·
2023
·
IF 4.1
Hao Zhu,Wenhui Lin,Liwen Fan
This study focuses on the hydrothermal synthesis of magnetically activated carbon and its efficacy in As(III) adsorption. The successful incorporation of magnetite nanoparticles within the porous carbon structure was confirmed, enriching the adsorbent’s properties. Comprehensive characterization was performed to analyze the pore size distribution, zeta potential at varying pH levels, and thermostability using thermogravimetric analysis. These adsorbents exhibited high As(III) removal efficiency with a uniform pore distribution. The zeta potentials were observed to decrease with an increase in pH, suggesting a relationship between adsorbent charge and pH. Adsorption dynamics were rigorously modeled using pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models for different adsorbents labeled as a, b, c, and d. Each adsorbent displayed unique fitted parameters, revealing varied adsorption capabilities. The study further explored the adsorption kinetics and found that the pseudo-second-order kinetics model and the Langmuir model were most appropriate for describing the adsorption process. Adsorption thermodynamics was also fitted to elucidate the underlying adsorption mechanisms. For the a, b, c, and d adsorbents, the pseudo-first-order model, the qe (cal) values for the four adsorbents were 434.2, 418.4, 283.5, and 279.5 μg/g, respectively. Take adsorbent a as an example; the qm values for 298, 303, 308, and 313 K were 702, 673, 605, and 589 μg/g, respectively, and KL values of these temperatures were 0.021, 0.031, 0.018, and 0.009 L/μg, respectively. For the Langmuir model, the R2 values at the four temperatures were 0.999, 0.978, 0.985, and 0.993, respectively, which indicated that the Langmuir model showed higher fitness. For the Freundlich model, the KL values (L/μg) at the parameters of these temperatures are 432, 409, 328, and 294, respectively. For the Freundlich model, the 1/n values at temperatures of 298, 303, 308, and 313 K are 0.049, 0.045, 0.052, and 0.035, respectively. For the Freundlich model, the R2 values at parameters of 298, 303, 308, and 313 K are 0.986, 0.989, 0.982, and 0.872, respectively. For the Temkin model, the B values (in J/mol) are 30.93, 0.894, 0.824, and 0.782 at these temperatures, respectively. The KT values (in L/μg) are 1.02 × 106, 0.07 × 106, 0.003 × 106, and 0.002 × 106, respectively. The R2 values are 0.973, 0.958, 0.972, and 0.894, respectively. In the end, the ΔH, ΔS, and ΔG values for different adsorbents were calculated. Collectively, these findings contribute significant insights into the design and application of magnetically activated carbon adsorbents for effective As(III) removal.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Fuhua Wei,Fang Lan,Qinhui Ren,Hongliang Chen,Yutao Zhang,Zhao Liang
The Y/Cr-MOFs were synthesized via solvothermal treatment using 1, 3, 5-benzoic acid as the organic ligand and yttrium acetate hydrate and chromium acetate as the metal ions. The structures of the prepared Y/Cr-MOFs were characterized using FT-IR, XRD, TG, and SEM techniques. These characterized Y/Cr-MOFs were employed to investigate the adsorption efficiency of minocycline. Experimental findings indicate that minocycline adsorption by Y/Cr-MOFs follows both the second-order kinetic model and Freundlich isotherm. Within a span of 5 h, up to 90.4 % of minocycline can be adsorbed by Y/Cr-MOFs at pH 6. Moreover, a maximum removal capacity of minocycline reaching 506 mg/g was achieved with Y/Cr-MOFs. These results demonstrate the practical application potential of utilizing Y/Cr-MOFs for efficient minocycline adsorption.
研究领域:
环境科学
·
材料科学
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yiheng Miao,Weijun Peng,Yijun Cao,Luping Chang,Guixia Fan,Futao Yu
In the work, sulfhydryl functionalized montmorillonite nanosheets based hydrogel balls were firstly synthesized for Pb(II) adsorption, and then characterized by scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), surface area analyzer (BET), thermogravimetry (TG), and zeta potential . Effects of initial solution pH, adsorbent dosage, contact time, temperature on Pb(II) adsorption of the resulting hydrogel balls were investigated systematically. The experimental results showed that the increase amount of sulfhydryl functionalized montmorillonite nanosheets (MMTNs-SH) maintained the hydrogel balls a better porous structure and bigger specific surface area, endowing it a bigger adsorption capacity. The adsorption process was fitted well with pseudo-second-order kinetics model and Freundlich model, and more than 97% of Pb(II) could be removed under the optimum conditions. Moreover, hydrogel spheres have a certain cycle performance. In addition, the interactions between Pb(Ⅱ) ions and the oxygen atoms in the hydroxyl groups and the sulfur atoms in the sulfhydryl groups, and the ion exchange in MMTNs-SH dominated the adsorption.
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
Journal of Nanoelectronics and Optoelectronics
·
2018
·Vol. 13
·期 12
·1807-1815
·
IF 1.069
Wang Zheng,Wang Yan-Shi,Tong Zhuang,Deng Qin,Luo Sheng-Xu
This paper reports the formation of novel adsorbent material based on undulating venus shell (UVS), white conch shell (WCS), conus conch shell (CCS) and abalone shell (AS). These absorbent materials were prepared by grinding the shells followed by high-temperature calcination process.
The prepared adsorbents were well characterized by scanning electron microscopy (SEM), X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. Further, the effects of adsorbent dosage and temperature on the adsorption of Cd2+ by shell powder and related adsorption
isotherms were evaluated. The results indicated that the amount of adsorbent and temperature have a great influence on the adsorption process of the four adsorbents. Under optimized conditions, the four shell powders exhibited strong adsorption properties of Cd2+ which was consistent
with the Freundlich isotherm adsorption model. The optimal conditions for preparing shell powder adsorbents with the best adsorption performance were determined by evaluating the particle size, calcination temperature and calcination time during the preparation process and the prepared materials
were characterized by several techniques. The results demonstrated that the particle size of UVS powder was over 140 mesh at 450 °C with activation time of 60 min. Furthermore, the UVS powder exhibits apparent porous morphology after calcination and thus the specific surface area was markedly
increased. Consequently, the adsorption performance was significantly improved.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 36
·30384-30394
·
IF 3.289
Peng Zhang,Yaling Wang,Dongxiang Zhang,Han Bai,Valeri V. Tarasov
Calixarene-functionalized graphene oxide (GO) composites were synthesized via esterification and polymerization of calix[n]arenes (n = 4, 6, 8) onto graphene oxide surfaces for the first time. The GO composites were used to adsorb Nd ions from the aqueous phase due to their quite high BET surface areas. In this work, the GO composites (GO-C4, GO-C6, and GO-C8) showed high adsorption capacities (232.56, 219.78, and 311.53 mg g−1, respectively) compared to GO (110.99 mg g−1) during the removal process and excellent efficiency in removing a high concentration of neodymium ions (1150 mg L−1) from water. The results indicate that the adsorption ability for Nd ions was in the order of GO-C8 > GO-C4 > GO-C6 > GO. The adsorption processes of GO-C4 and GO-C8 were completed within 185 min, whereas that of GO-C6 was achieved within 230 min. Furthermore, controlling the pH value of an aqueous solution in the range of 6, the GO composites exhibited the highest adsorption capacity toward Nd ions. For our process of removing Nd ions, the adsorption data of experiments mostly fit the pseudo-second-order model better than two other models. Four adsorption isotherm models were compared to study the details of the adsorption process, and the results indicated that the Freundlich model is the most suitable for describing the adsorption process of the GO composites. The adsorption mechanisms to remove Nd ions were the electrostatic attraction of Nd ions with hydroxyl functional groups and the complexation process of Nd ions with functional groups on the surface of the GO composite. Moreover, thermodynamic studies indicated that the adsorption behavior of the GO composites towards Nd ions was an endothermic and spontaneous natural process. In general, GO composites could potentially be applied to metal ion removal.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Yang Mu,Miao Cui,Shaoqing Zhang,Jing Zhao,Changgong Meng,Qi Sun
Organosilanes with different head groups and chemical properties, including phenyltriethoxysilane (PTES), aminopropyltriethoxysilane (APTES), and trimethylchlorosilane (TMCS), were used to modify the adsorption properties of diatomite (DE). Characterizations of the as-synthesized samples were investigated by scanning electron microscopy (SEM), infrared spectroscopy (IR), thermogravimetric analysis (TGA), nitrogen adsorption–desorption and solid-state 29 Si magic angle spinning nuclear magnetic resonance (MAS NMR). SEM imagines show that the morphology of DE was remained during the modification. IR spectra provide clear evidence that they were indeed modified as intended. The results of TGA show that the weigh losses of all samples were increased after silylation. And the MAS NMR indicated that large amounts of isolated silanols condense with the organolsilanes, which further proved the organic groups have been loaded onto the diatomite. The adsorption experiments of methane by raw and three modified diatomite were also studied. Results showed that the adsorption amount increases constantly with the increasing of pressure and the equilibrium have not been reached at the room temperature. The adsorption data indicate that the sorption of CH 4 on modified products and diatomite are dominated by multilayer coverage and they all fit the Freundlich isotherm equation well. The PTES-DE and APTES-DE have excellent CH 4 adsorption capacity and they can reach the adsorption target proposed by DOE far below 35 bar, at 3 bar and 7.5 bar respectively. These two materials exhibit excellent adsorption performance for CH 4 and have the potential to provide improved methods for reducing greenhouse gas emissions.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Kexin Zhang,Haiyan Li,Xingjian Xu,Hongwen Yu
In this work, we report a room-temperature approach to synthesizing nitrogen-functionalized graphene oxide (GO). The chemical structure of GO- triethylenetetramine-methacrylate (GO-TETA-MA) was characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and 13C nuclear magnetic resonance, respectively. The GO-TETA-MA demonstrated extremely efficient removal of copper from wastewater. The adsorption capacity was found to be 34.4 mg/g for Cu(II) (at pH = 5 and 25 °C). The final concentration of Cu(II) was lower than the quality standard for groundwater and even lower than the allowable level of copper contaminant in drinking water in China. The effects of several parameters on adsorption, including pH value, contact time, adsorption temperature, initial concentration, acid stability, and thermal stability, were investigated. Kinetic data were well-described by a pseudo-first-order model. Both Freundlich and Langmuir isotherm models were applied to the experimental data analysis, and the former proved to be a better fit. The underlying mechanism of synergistic adsorption of heavy metal ions was considered. Then, the removal efficiency for four copper fungicides was studied and was found to reach 100%. These results suggest that GO-TETA-MA has the potential to be applied in environmental management.
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
Applied Water Science
·
2021
·Vol. 11
·期 9
·1-8
·
IF 3.874
Song Fuxiang,Wang Na,Hu Zezhou,Zhang Zhen,Mai Xiaoxue,Jie Weibo,Bin Liu
Oral medical wastewater with heavy metal ions (such as plumbum, Pb 2+ ) is regarded as the main pollutant produced in the oral cavity diagnosis, and the treatment process can pose a serious threat to human health. The removal of Pb 2+ from oral medical wastewater facing major difficulties and challenges. Therefore, it is of great significance to take effective measures to remove Pb 2+ by using effective methods. A new activated three-dimensional framework carbon (3D AFC), regarded as the main material to remove Pb 2+ in the oral medical wastewater, has been fabricated successfully. In this experiment, the effects of 3D AFC absorbing Pb 2+ under different conditions (including solid-to-liquid ratio, pH, ionic strength, contact time, and initial concentration, etc.) were discussed. And the result revealed that the adsorption kinetics process of Pb 2+ on 3D AFC conformed to the pseudo-second-order model and the adsorption isotherm conformed to the Freundlich model. Under the condition that pH = 5.5 and T = 298 k, the calculated maximum adsorption capacity of 3D AFC for Pb 2+ was 270.88 mg/g. In practical application, it has strong adsorption ability for Pb 2+ in oral medical wastewater. Thus, 3D AFC shows promise for Pb 2+ remove and recovery applications because of high adsorption capacity for Pb 2+ in oral medical wastewater due to its high specific surface area, outstanding three-dimensional network structure.
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
POLYMER BULLETIN
·
2016
·Vol. 73
·期 8
·2321-2341
·
IF 1.371
Yang Man,Huang Yun,Cao Haijun,Lin Yuanhua,Cheng Xiaowei,Wang Xia
The organic–inorganic self-doped poly (vinyltrimethoxy silane-ethylene glycol dimethacrylate) (VE resin) was
synthesized by solution polymerization, hydrolysis and dehydration condensation. In this method, ethylene glycol dimethacrylate (EGDMA) was used as cross-linked reagent to form a three-dimensional network structure. Then, the system was prepared by radical polymerization in the presence of the hydrolysis of –OCH 3 and the dehydration condensation of Si–OH. The maximum adsorption capacity 75.68 mg g −1 was achieved when pH was 6, the contact time 60 min, the adsorbent dose 0.1 g, the initial concentration 3000 mg L −1 and the temperature 293 K. The adsorption kinetics followed the pseudo-second-order kinetic model, and the intra-particle diffusion was but not the only rate-limiting step. Adsorption isotherms of phenol were linearly correlated and found to be well represented by the Freundlich model. Thermodynamic parameters such as changes in the enthalpy (Δ H ), free energy (Δ G ) and entropy (Δ S ) indicated that the adsorption process of phenol on VE resin were physical and exothermic. After four regeneration recycles, the adsorption capacity of VE resin remained at 95.04 % of the initial value, which illustrated that it possessed good regeneration capacity.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Zaharaddeen N. Garba,Saadatu A. Hamza,Chavalit Ratanatamskul
In this study, a novel impregnation method was adopted by adding Cu 2+ to microcrystalline cellulose (MCC) powder, producing a composite material (Cu-MCC) that was used as a sorbent to treat water contaminated by crude oil. The produced Cu-MCC was examined using a variety of characterization techniques. With the application of central composite design (CCD) for testing the influenced parameters, the experimental and predicted oil sorption capacity (OSC) values were 10.61 and 9.86 mg/g, respectively at the optimal condition of initial concentration (120 mg/100 mL), sorbent dosage (80 mg) and reaction time of 78 mins. This indicates that the predicted values from the model agree closely with the experimental values, with only a small error of 0.75. The adsorption data were simulated using five different versions of the linearized Langmuir equations along with the Freundlich and Temkin adsorption isotherms. Langmuir-2, which denotes a monolayer sorption process best describes the equilibrium adsorption data giving maximum sorption capacity of 6.48 mg/g with pseudo-second order model as the best model for the kinetics data. The findings show that Cu-MCC is very promising as an effective material for cleaning up water contaminated from crude oil.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Ruyue Guo,Jiayuan Chang,Huayi Li,Jie He,Peng Pan,Zhengchun Yang,Jun Wei
A core–shell structure that can achieve effective adsorption of methyl orange (MO) can be prepared by using 26-facet Cu 2 O as a template for producing copper using a reducing agent. However, there are insufficient studies on this topic. Therefore, in this study, Cu 2 O@Cu composites were synthesized using a two-step liquid-phase reduction method. MO was used as a pollutant to test the adsorption properties of the materials. The adsorption experiments showed that the adsorption process followed pseudo-first-order kinetic and Freundlich isotherm. The maximum capacity of the adsorbent was 498 mg/g, and the adsorption occurred via spontaneous and exothermic physical adsorption. By the comparison of adsorbent before and after adsorption, it was found that the content of Cu + decreased and that of CuO increased, indicating that the material was oxidized during the adsorption process. Further, FTIR spectroscopy and zeta potential showed that the adsorption mechanism was the electrostatic attraction between positively charged adsorbent and the sulfonic acid group of the MO. Therefore, the porous core-shell structure and the positively charged adsorbent facilitated the adsorption of anionic dyes. 1 TD can be used as an effective adsorbent for MO.
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
危险品化学品经营许可证（带存储）