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
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材料科学
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DOI
PubMed
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
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材料科学
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DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 36
·30384-30394
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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
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环境科学
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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
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材料科学
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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
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材料科学
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DOI
高影响因子
POLYMER BULLETIN
·
2016
·Vol. 73
·期 8
·2321-2341
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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
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材料科学
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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
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材料科学
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DOI
高影响因子
Colloid and Interface Science Communications
·
2020
·
IF 2.831
Yuan Lei,Qiang Huang,Jibo Dou,Hongye Huang,Guang Yang,Fengjie Deng,Meiying Liu,Xiancai Li,Xiaoyong Zhang,Yen Wei
In this work, a novel adsorbent, sulfonic acid-functionalized carbon nanotubes (CNT-FA-SA) composite was synthesized by Diels-Alder (DA) chemistry and electrophilic substitution reaction . The adsorption of methylene blue (MB) onto CNT-FA-SA was systematically investigated. Based on the experimental data, MB was rapidly removed by CNT-FA-SA composite with maximum adsorption capacity of 236.55 mg/g under certain conditions. The non-linear relevant fitting result of Langmuir isotherm model fully estimates that the maximum adsorption capacity of monolayer can reach to 1584.22 mg/g. The adsorption kinetic is fitted better with the pseudo-second-order model than the pseudo-first-order kinetic model , and the isotherms were well described by Freundlich isotherm model. The data testified that the adsorption process is monitored by chemisorption and physical adsorption simultaneously. Relevant results also indicate that the adsorption occurred on heterogeneous multilayer surface. The parameters of pH and thermodynamic manifested that adsorption of MB onto CNT-FA-SA composites was pH-dependent and spontaneous endothermic reaction.
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
ENVIRONMENTAL ENGINEERING SCIENCE
·
2015
·Vol. 32
·期 10
·881-890
·
IF 0.991
Man Yang,Yun Huang,Haijun Cao,Yuanhua Lin,Xing Li,Huanmin Li
A new hydrophilic acrylic ester resin (MSE-resin) was synthesized by suspension polymerization from methyl methacrylate (MMA), sodium p-styrene sulfonate (SSS), and ethylene glycol dimethacrylate (EGDMA). Batch adsorption studies indicated that the optimum adsorption was achieved when pH was 5, contact time 180 min, adsorbent dose 0.2 g, initial concentration 2,000 mg/L, and temperature 313 K. Experimental data showed a good fit with the pseudosecond-order kinetic model. Intraparticle diffusion analysis indicated that the intraparticle diffusion was involved in the adsorption process, but it was 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 (ΔH), free energy (ΔG), and entropy (ΔS) indicated that the process of adsorption phenol on MSE-resin was endothermic and spontaneous.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Jun-Chao Zuo,Sheng-Rui Tong,Xiao-Lin Yu,Ling-Yan Wu,Chang-Yan Cao,Mao-Fa Ge,Wei-Guo Song
Two novel adsorbents to remove excess arsenate and arsenite in the drinking water were prepared for the first time by grafting monoamine and diamine, respectively, and then coordinating Fe 3+ on silica gel that was obtained using sol–gel method with two-step acid-base catalysis. It was found that both adsorbents had mesoporous structure, large specific surface, and high amino and iron content according to N 2 adsorption isotherms, FTIR, XPS, and NMR analysis. The removal ability and adsorption rate of the adsorbents were very high for both As(V) and As(III). Langmuir and Freundlich models were used to fit the adsorption isotherm and investigate the adsorption mechanism. The effects of chloride and sulfate anion on the removal of arsenate and arsenite for the two adsorbents were also studied.
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 CHROMATOGRAPHY A
·
2019
·
IF 3.858
Na Wang,Xuesheng Zhou,Bo Cui
In this work, a polymeric imidazolium-embedded octadecyl ionic liquid (poly(1-vinyl-3-octadecylimidazolium naphthalene sulfonate))-grafted silica (poly(C 18 VIm + NapSO 3 − )@SiO 2 ) sorbent was prepared and applied as a solid-phase extraction (SPE) sorbent in extraction of flavonoids. The synthesized poly(C 18 VIm + NapSO 3 − )@SiO 2 sorbent was characterized by X-ray photoelectron spectrogram (XPS) and fourier transform infrared spectroscopy (FT-IR). The thermodynamic and kinetic adsorption models of the prepared poly(C 18 VIm + NapSO 3 − )@SiO 2 sorbent towards flavonoids were discussed by nonlinear fitting adsorption curve and the results indicated the thermodynamic adsorption model in this work was tended to be Freundlich model rather than Langmuir one and the pseudo-second order model could be used to describe the dynamic adsorption process. In addition, the adsorption amounts indicated the sorbent has satisfactory extraction capabities towards flavonoids. For investigating the influence of independent variables and their interactions on the extraction efficiency, a Box-Behnken design was used for optimizing three greatly influential parameters after performing single-factor experiments. The interaction energies between flavonoids and two ionic liquids were calculated to understand the adsorption mechanism. Under the optimal conditions, a method used for determining flavonoids was developed by combining SPE technique with high performance liquid chromatography (HPLC), and the developed method exhibited low limits of detection (0.25–0.4 μg L -1 ), good linearities with correlation coefficients (R 2 ) in the range of 0.9951–0.9996 and satisfactory recoveries ranging from 83.6% to 114.1%, which confirmed the proposed method could be successfully used to determine trace flavonoids in real samples.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Pei Yuan,Xiaoling Li,Wangyang Wang,Haiyan Liu,Yan Yan,Haifeng Yang,Yuanyuan Yue,Xiaojun Bao
A series of SBA-15 with different modifications have been successfully prepared and applied as adsorbents to remove polycyclic aromatic hydrocarbons (PAHs) from aqueous solutions. The morphology and structural properties of the chemically modified materials are all similar to those of pure SBA-15, and thus the difference of PAHs adsorption capacity can be directly attributed to the different functional groups, which is favorable to deeply explore the adsorption mechanism. Adsorption kinetics and isotherm experiments for naphthalene (Nap), anthracene (Ant), and pyrene (Pyr) were carried out, and the results reveal that the adsorption processes follow a pseudo-second-order rate equation and the equilibrium can be achieved within 120 min for Nap and Ant, whereas only 90 min for Pyr, indicating that the more hydrophobic molecules, the easier and faster adsorption can be obtained. All of the adsorption isotherms fit well with the Freundlich model, suggesting the unevenly distributed active sites on adsorbents. The phenyl-functionalized materials possess the highest adsorption capacity, implying that the π–π interaction is the most primary interaction and plays the predominant role in the studied PAHs adsorption, superior to the acidic and hydrophobic interaction. Our research sheds light on the design and synthesis of advanced and highly efficient adsorbents to remove PAHs from aqueous solutions.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）