MOLECULES
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2023
·Vol. 28
·期 8
·3410
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IF 4.6
Yuyu He,Liangmeng Ni,Qi Gao,Hao Ren,Mengfu Su,Yanmei Hou,Zhijia Liu
To effectively remove methylene blue (MB) from dye wastewater, a novel activated carbon (BAC) was manufactured through co-pyrolysis of bamboo shoot shell and K2FeO4. The activation process was optimized to a temperature of 750 °C and an activation time of 90 min based on its excellent adsorption capacity of 560.94 mg/g with a yield of 10.03%. The physicochemical and adsorption properties of BACs were investigated. The BAC had an ultrahigh specific surface area of 2327.7 cm2/g and abundant active functional groups. The adsorption mechanisms included chemisorption and physisorption. The Freundlich model could be used to describe the isothermal adsorption of MB. The kinetics confirmed that the adsorption of MB belonged to the pseudo-second-order model. Intra-particle diffusion was the main rate-limiting step. The thermodynamic study showed that the adsorption process was endothermic and temperature was beneficial for the improvement of adsorption property. Furthermore, the removal rate of MB was 63.5% after three cycles. The BAC will have great potential for commercial development for purifying dye wastewater.Keywords:bamboo shoot shell;activated carbon;adsorption process;methylene blue;K2FeO4
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 SOLID STATE CHEMISTRY
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2024
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IF 3.2
Shilin Diao,Mengfang Li,Xuan Liu,Yujia Liu,Qingjin Shang,Yewei Xu
A hybrid material , Ca/Mg-MOF/polyamidoxime (Ca/Mg-MOF/PAO), was synthesized and tested for uranium(VI) uptake in solution. The structure and performance of Ca/Mg-MOF/PAO were comprehensively investigated. Adsorption experiments demonstrated that Ca/Mg-MOF/PAO exhibited an extraordinary saturation capacity of 579.5 mg/g for uranium (VI) at pH = 8, surpassing that of most other adsorbents. The adsorption process of Ca/Mg-MOF/PAO on uranium (VI) conformed to Langmuir and PSO models, suggesting chemical rate control and monolayer adsorption, respectively. Furthermore, Ca/Mg-MOF/PAO displayed excellent adsorption-desorption recovery performance for uranium (VI). Its high adsorption capacity and efficient recoverability position Ca/Mg-MOF/PAO as a material with great potential for extracting uranium (VI) from aqueous media.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Jiali Zhang,Dapeng Li,Yujing Weng,Qi Sun,Sebastien A. Duval,Rashid M. Al Othman,George P. Lithoxoos,Yulong Zhang
Due to stricter worldwide environmental mandates on SO2 emission from oil and gas industrial facilities, the modified Claus process, which is the primary tool for reducing emission of SO2 into the atmosphere in these facilities, has undergone a lot of innovative changes during the past decades. An example of such innovation is the addition of what is called tail gas treating (TGT) technologies. Currently, advanced TGT technologies ensure that gas plants and refineries emit less than 0.01% (v/v) of the sulfur species that enter into the sulfur recovery units; they commonly use absorption-based processes to separate sulfur species from the tail gas. Because of this requirement, TGT technologies are expensive. This paper reports the data that were obtained from bench-scale tests that were carried out to assess the feasibility of using commercially available adsorbents for the process that is described in the patent, Two-Stage Adsorption Process for Claus Tail Gas Treatment, US Patent No.10662061. In one of the embodiments of this process, the tail gas is treated in two steps. It is first dehydrated by 3A molecular sieves and then by 5A molecular sieves to remove H2S. The separation in the second step will ensure the presence of a rich H2S-laden stream that is ready for routing to the thermal reactor of the modified Claus process. The data collected in this study indicate the following: (1) Commercial molecular sieves can be used for cost-effective tail gas treatment of natural gas plants’ and refineries’ sulfur recovery units. (2) This cost-effectiveness of such use can be valid when molecular sieve material selection is as described in US Patent No.10662061, “Two-Stage Adsorption Process for Claus Tail Gas Treatment”. (3) Adsorption-based tail gas treatment is advantageous since it results in enabling the global oil and gas industry to virtually eliminate all SO2 emissions from its facilities.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
ACS ES&T Water
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2024
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IF 4.8
Yuyao Zhang,Zhonghao Wan,Tingjie Zhan
Adsorption processes in aqueous environments are critical for understanding pollutant dynamics, assessing ecological risks, and safeguarding human health. Many techniques have been developed to study solid–liquid adsorption including spectroscopic methods. However, there is still a need for supplementary techniques that provide real-time, atomic-scale, and in situ monitoring to achieve a more comprehensive understanding of adsorption mechanisms. Herein, chemical force microscopy (CFM) was utilized to measure hydrophobic interactions to determine the pollutant adsorption at the solid–liquid interface. The hydrophobized probe was employed to ramp onto the adsorbent substrate of interest under aqueous conditions. The forces detected were dependent on the surface adsorption of pollutants on the adsorbent surfaces. From the CFM force–distance curves, adsorption kinetics was obtained for tetracycline and phenol on the graphite surface, which aligned with the results from batch experiments and the in situ streaming potential test. Our findings demonstrate a novel strategy for the real-time interpretation of adsorption processes utilizing CFM that holds the potential to revolutionize studies in environmental interfaces.
研究领域:
环境科学
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表面化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Weiqing Zhou,Aiguo Zhou,Bing Wen,Peng Liu,Zhenli Zhu,Zou Finfrock,Jianwei Zhou
The environmental fate of antimony (Sb) is often strongly affected by adsorption, and the Sb isotope fractionation mechanism during adsorption has not been reported. Four batch experiments (kinetic, isothermal, effect of pH, and effect of coexisting anions) were conducted to evaluate the mechanism of Sb(V) adsorption to γ-Al 2 O 3 and the fractionation of Sb isotopes. Extended X-ray absorption fine structure (EXAFS) analyses show Sb(V) adsorption on γ-Al 2 O 3 occurs via outer-sphere surface complexation. The triple-layer model (TLM) effectively predicted the theoretical Sb adsorption amount under different pH conditions. The Sb isotope fractionation in the adsorption process can be divided into an initial kinetic stage (Rayleigh model, α adsorbed-aqueous = 0.99975 ± 0.00003) and subsequent isotopic equilibrium stage due to isotope exchange; however, no significant equilibrium isotope fractionation (Δ 123 Sb aqueous-adsorbed = ~0 ± 0.08‰) was evident by the end of the experiments. We propose the lack of significant equilibrium isotope fractionation in the effect of pH and isothermal experiments is due to Sb forming an outer-sphere complex on γ-Al 2 O 3. This study reveals Sb equilibrium isotope fractionation does not occur during Sb(V) adsorption onto γ-Al 2 O 3 , providing a reference for the future study of Sb isotopes and furthering understanding of the Sb isotope fractionation mechanism.
研究领域:
环境科学
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地球化学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Rui Shan,Yueyue Shi,Jing Gu,Jingwang Bi,Haoran Yuan,Bo Luo,Yong Chen
A series of mangosteen-derived biochars were produced by several modifiers (HCl, KOH and ZnCl 2 ), in different preparation conditions (i.e. pyrolysis temperature, pyrolysis process and impregnation ratio). It indicated that the Z2PT350-700 presented excellent ability for Cr(VI) removal. The physical/chemical properties of the prepared biochar are reflected by the electrostatic interaction, surface complexation, ion exchange occupied primary position in the process of adsorbing Cr(VI). Besides, the effects of reaction time, pH, adsorbent dosage and initial adsorbate concentration on Cr(VI) removal were evaluated. The sorption process of Cr(VI) could be described by the pseudo-second order (PSO) kinetic model and Sips isotherm model. In optimal reaction condition, the surface of Zn2MB350-700 was composed of homogeneous and heterogeneous adsorption and the chemical adsorption dominated in the adsorption process . Therefore, the results suggested that Zn2MB350-700 could be used as an inexpensive and highly efficient adsorbent for Cr removal from water environment.
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
Materials
·
2023
·Vol. 16
·期 14
·5192
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IF 3.4
Kamal Shalabi,Hany M. Abd El-Lateef,Mohamed M. Hammouda,Amany M. A. Osman,Ahmed H. Tantawy,Mohamed A. Abo-Riya
Through our present study, three novel Gemini-fluorinated cationic surfactants bearing different spacers (FSG6-2, FSG6-4, and FSG6-6) were synthesized, and their structures were explained via different spectroscopic instruments such as1H,13C, and19F NMR spectra. The surface activity of the as-prepared surfactants was examined. The inhibiting influence of FSG6 molecules on the X60 steel corrosion in the pickling solution (HCl) was examined by diverse methods comprising electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and X-ray photoelectron spectroscopy (XPS) experimentations, and computational calculations. The inhibition effectiveness of FSG6 surfactants followed the order of 93.37% (FSG6-2) < 96.74% (FSG6-4) < 98.37% (FSG6-6) at 2.0 × 10−4M. The FSG6 surfactants function as mixed-type inhibitors, according to PDP investigations. The H2O molecules that adsorbed on the steel interface were substituted with surfactant molecules, and the surfactant’s inhibitory activity is likely caused by the improvement in an adsorptive layer on the steel substrate, as specified by the EIS results. The Langmuir isotherm describes the absorption of FSG6 molecules on the metal surface. The XPS investigations validate the steel interface’s extremely protective nature. The mechanism of interaction between FSG6 molecules with an X60-steel employing the DFT calculations and MC simulations methods was also examined and discussed.Keywords:fluorinated gemini surfactants;inhibition route;adsorption process;surface analysis;computational calculations
研究领域:
材料科学
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化学工程
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计算化学
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DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2020
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IF 4.551
Ruobing Yu,Zhicong Wu
In this study, by the application of the strong interaction between a metal-organic framework material and ofloxacin, ZIF-8 was proposed as an absorbent to remove ofloxacin from wastewater. The results demonstrated that ZIF-8 could remove 96.3 ± 1.1% of ofloxacin from the ofloxacin solution of 100 mg/L, and the maximum equilibrium adsorption capacity reached 194.1 ± 0.4 mg/g, which is superior to that of an adsorbent based on physical adsorption. The high specific surface area and strong interaction between ofloxacin and ZIF-8, including strong hydrogen bonding , complexation of unsaturated metals, and electrostatic interactions , contributed to the adsorption process . Moreover, the adsorption efficiency reached 80.2% after four adsorption cycles. The pseudo-second-order kinetics and Langmuir adsorption model can describe the adsorption of ofloxacin by ZIF-8. Therefore, ZIF-8 is a promising material for the treatment of wastewater containing ofloxacin.
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
高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Guo Xin,Wang Jinke,Huang Luyao,Wang Yajie,Ma Li,Zhang Dawei,Ma Lingwei
The corrosion inhibition effect of 3-amino-5-mercapto-1,2,4-triazole (AMT) on AA2024 aluminium alloy in 3.5 wt.% NaCl solution was investigated, and the corrosion inhibition mechanism was revealed. The influence of AMT concentration on the corrosion inhibition performance was evaluated by potentiodynamic polarization curve and electrochemical impedance spectroscopy (EIS). Surface analysis and surface-enhanced Raman scattering (SERS) spectra were used to study the adsorption process and corrosion inhibition mechanism of AMT on the alloy surface. Polarization curve and EIS results showed that when the AMT concentration was 1.5 g/L, the corrosion current density (icorr) was the lowest and the resistance of adsorption film (Rf) was the largest, illustrating the highest corrosion inhibition efficiency. Moreover, the adsorption kinetics process of AMT was revealed by SERS measurement, and a positive correlation between the SERS intensity and Rf values of AMT after different immersion time was achieved. It indicated that the efficient adsorption of corrosion inhibitors significantly enhanced the corrosion inhibition performance. Density functional theory (DFT) and molecular dynamics simulations were used to give further insight into the adsorption and inhibition mechanism of AMT on the aluminium alloy surface.
研究领域:
材料科学
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电化学
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理论计算
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Ying Yan,Chengzhi Hu,Zijian Wang,Huiping Zhang
Carbon nanotubes (CNTs) are considered an effective adsorbent for VOCs adsorption due to their excellent physical properties. But the adsorption properties of CNTS are greatly weakened due to the agglomeration effect. As a new type of structural material, microfiber composite can effectively solve this problem. In this work, camphor was used as the precursor to growing carbon nanotubes directly on the surface of paper-like stainless steel fibers (PSSF) by chemical vapor deposition , and the microfiber composite carbon nanotube membrane was prepared. The effects of growth time, temperature and flow rate of carrier gas on the growth of carbon nanotubes were discussed. The mechanism of mass transfer enhancement of the adsorption process of toluene by microfiber composites was investigated by constructing a mixed fixed bed of carbon nanotubes and composites. Compared with the structured bed of 3 cm CNTs, the length of unused bed (LUB) of 1.5 cm CNTs+ 1.5 cm CNTs/PSSF decreased by 0.209 cm, and the bed utilization ∆Z increased from 59.36 % to 66.33 %. The mixed fixed bed adsorption process can be well-fitted by the Yoon-Nelson model (R 2 =0.91).
研究领域:
材料科学
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环境工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Yiwen Wang,Yafei He,Aijun Gong,Lina Qiu,Min Zhang,Mory Traore,Xiaoning Zhan,You Li,Yuzhen Bai,Yang Liu,Ge Gao,Weiyu Zhao
We developed an adsorption column that can be used for rare earth recovery from acid mine drainage (AMD). 2-[2-oxo-2-(1-pyrrolidinyl)ethoxy] acetic acid was used as a functional ligand grafted onto amino silica gel , resulting in an adsorbent selective for rare earth metals . Adsorption columns for the enrichment of rare earth metals have been made using this functional silica. A flow rate of 500 µL min −1 and an eluent of pH= 2 0.013 mol L −1 DTPA were determined as the optimum operating conditions. The recovery of actual AMD using SiO 2 @PYRDGA adsorption column achieved 82.29%, 75.66%, 85.10%, 78.43% for Er, Gd, Nd and La, and the purity of rare earth in AMD can be increased about 10 times after recovery. In addition, the thermodynamics, kinetics, adsorption mechanism, and theoretical calculations of the adsorption process were investigated in detail.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
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IF 5.107
Dongze Wang,Xuemei Li,Xiangqun Jin,Qiong Jia
In the present study, cucurbit[6]uril-based hypercrosslinked polymers (HCPs) were successfully synthesized and employed for the capture of albendazole, a broad-spectrum anthelmintic drug. Fourier-transform infrared spectroscopy, elemental analysis, powder X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, and N 2 adsorption-desorption measurements were used to prove the successful preparation of the desired HCPs. Thanks to the encapsulation of cucurbit[6]uril toward albendazole and the high surface area of HCPs, remarkable adsorption capacity of albendazole was achieved. The adsorption behavior followed Langmuir adsorption isotherm with a negative value of Gibbs free energy change, suggesting a spontaneous adsorption process. In addition, the kinetics of albendazole adsorption was investigated, which could be described with the pseudo-second-order kinetics model.
研究领域:
材料科学
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药物化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）