FUEL
·
2024
·
IF 6.7
Ruhao Gong,Haihui Chen,Xiuya Rao,Jihong Chi,Ziqi Zhang,Guiling Xu,Dandan Chen,Qiang Zhou,Ping Lu
Mn/Cu co-doping mesoporous carbon sorbent (MnCu x -C) was synthesized via using hard template method. Thymol blue (C 27 H 30 O 5 S) was used as carbon source and MCM-41 was applied as template agent. Copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O) and manganese acetate tetrahydrate (MnC 4 H 6 O 4 ·4H 2 O) was in-situ co-doped with carbon source as Cu/Mn metals precursor. Mercury removal on the MnCu x -C sorbent was investigated on a fixed bed experimental apparatus. The physical and chemical characteristics of the MnCu x -C sorbent were investigated by using BET, SEM, FTIR, XRD and XPS, respectively. Combing with mercury programmed temperature desorption (Hg-TPD) and density functional theory (DFT), the mechanism of mercury adsorption on the MnCu x -C sorbent was revealed. The results showed that the synthesized MnCu 0.1 -C sorbent displayed high mercury removal performance at 150℃, which was considered to be a potential sorbent for mercury removal from industrial flue gas. Mn doping on the mesoporous carbon greatly improved the mercury removal ability of sorbent with mercury capture rate increasing from 6 % to 89 %. Doping of Cu can effectively improve the SO 2 tolerance of the MnCu 0.1 -C sorbent for mercury removal. With different concentration of SO 2 existing in flue gas, the MnCu 0.1 -C sorbent still kept high mercury removal ability. O 2 in flue gas promoted mercury removal on the MnCu 0.1 -C sorbent with main product of HgO. In the presence of SO 2 , a small amount of HgSO 4 formed on the MnCu 0.1 -C sorbent. The DFT analysis further displayed that Hg 0 was mainly chemisorbed on the surface of MnCu 0.1 -C sorbent with formation of HgO.
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
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Rui Zhao,Tingting Ma,Shuai Zhao,Huazhen Rong,Yuyang Tian,Guangshan Zhu
Metal-organic frameworks (MOFs) have been attractive adsorbents for the treatment of antibiotic wastewater. However, in their powder form, the adsorbents suffer from the disadvantage of poor recyclability and complex operational process. Herein, we incorporated typical MOFs (ZIF-8, ZIF-67, HKUST-1, and Fe-BTC) into low-cost chitosan matrix for the tetracycline removal. Metal hydroxide(or metal oxide)/chitosan composite beads from the metal salt/chitosan solution were used as MOF precursor, which lead to the uniform and stable MOF loading into chitosan. This composition could not only shape MOFs into beads but also improve the adsorption capacity of the chitosan. As a result, ZIF-8-chitosan composite beads exhibited good adsorption performance toward antibiotic tetracycline. The adsorption processes followed pseudo-second-order model and Langmuir isotherm model. The maximum adsorption capacity could reach 495.04 mg/g, which is higher than most of the MOF-based or natural polymer-based tetracycline adsorbents. Moreover, the removal efficiency of ZIF-8-chitosan composite beads toward tetracycline was still above 90% after ten adsorption-desorption cycles. In the fixed-bed experiment, ZIF-8-chitosan column could treat ~887 bed volumes (BV) of tetracycline solution in real water sample. Both experimental characterizations and DFT calculations indicated that the adsorption mechanism involves in the electrostatic interaction, π-π stacking interaction and hydrogen-bonding interaction. This study provides a promising strategy for uniform MOF loading into the matrix and potential adsorbents for pharmaceutical wastewater treatment.
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
Journal of Cleaner Production
·
2025
·
IF 10
Dongfang Xiang,Fang Fang,Xiongying Shi,Chenyang Rao,Shaopan Bao,Bo Xian,Fuhao Chu,Tao Fang
This study successfully prepared three types of composite gelled beads blended with modified biochar: Sodium alginate/thiol-modified lotus seedpod biochar/CaCO 3 @polyvinyl alcohol (SA/LBS/PF@PVA), Sodium alginate/thiol-modified lotus seedpod biochar/CaCO 3 @chitosan (SA/LBS/PF@CTS), and Sodium alginate/thiol-modified lotus seedpod biochar/CaCO 3 @carboxymethyl cellulose (SA/LBS/PF@CMC). Their maximum Cd 2+ adsorption capacities reached 138.73 mg/g, 64.42 mg/g, and 64.90 mg/g, respectively. These gelled beads exhibited an excellent three-dimensional network structure, particularly SA/LBS/PF@PVA, which displayed outstanding swelling properties. FTIR, XPS, and batch experiments confirmed that the primary adsorption mechanisms for SA/LBS/PF@PVA and SA/LBS/PF@CTS were ion exchange and chelation, whereas SA/LBS/PF@CMC primarily relied on ion exchange, electrostatic interaction and complexation. The adsorption of SA/LBS/PF@PVA and SA/LBS/PF@CMC followed the Freundlich model, while SA/LBS/PF@CTS adhered to the Langmuir model. After five adsorption-desorption cycles, the adsorption capacities of SA/LBS/PF@PVA, SA/LBS/PF@CTS, and SA/LBS/PF@CMC remained relatively stable but lost 26.0%, 17.9%, and 29.2% of their mass, respectively. In fixed-bed column experiments, 2 g of SA/LBS/PF@PVA, SA/LBS/PF@CTS, and SA/LBS/PF@CMC achieved Cd 2+ removal capacities of 113.83 mg/g, 53.75 mg/g, and 87.65 mg/g, respectively, with column efficiencies of 43.94%, 31.12%, and 58.65%. This study highlights the significant impact of the components and ratios of sodium alginate-based composite gelled beads on their adsorption characteristics, indicating that optimizing the formulation and improving mechanical properties can enhance their practical application effectiveness.
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
Particuology
·
2021
·
IF 3.067
Youhong Zhang,Yinpei Zhu,Leslie S. Loo,Jianguo Yin,Kean Wang
Molecularly imprinted polymer (MIP) beads imprinted with vitamin E (V E ) were synthesized via a two-step swelling polymerization method, using methacrylic acid (MAA) and other functional monomers together with polystyrene (PS) microspheres as the substrate. In initial trials, different functional monomers were assessed, along with a variety of solvents and imprinting ratios. The MIP MAA sample exhibited the highest performance and was characterized and also assessed with regard to V E adsorption under various experimental conditions. This material exhibited reasonably good sphericity, porosity and stability, along with an excellent adsorption capacity of 46 mg/g. This was much higher than the value for the corresponding non-imprinted polymer made with the same monomer, and 20% higher than that for an acrylamide-based MIP synthesized using a precipitation polymerization method. The core-shell structured MIP MAA also demonstrated fast adsorption kinetics, a low pressure drop and good reusability in fixed bed experiments. The V E adsorption equilibrium, selectivity, kinetics, thermodynamics and regeneration capacity of this material were also examined and are reported herein.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Xiao Jiang,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai,Zhan Shi
Versatile adsorptive materials that can efficiently capture anionic and cationic heavy metals are extremely significant in purification of complex wastewater systems. Herein, a new type of amine modified, biopolymer-derived core/shell-like adsorbents were employed in heavy metal anion and cation adsorption. The maximum adsorption capacities for Cr(VI), Pb(II), and Cu(II) were measured to be 497.1, 535.6, and 163.7 mg/g, respectively. The adsorbent also showed great performance in heavy metal cation adsorption in fixed bed column experiments. Additionally, removal efficiency and rapid adsorption kinetics on low concentration heavy metal pollutions for both anion and cations were well discussed to demonstrate the potential in real accidental heavy metal pollution. The prepared core/shell-like biopolymer adsorbents were demonstrated to be a kind of versatile adsorbent for both anionic and cationic heavy metal ions in aqueous solutions.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Greenhouse Gases-Science and Technology
·
2023
·
IF 2.2
Zifan Xing,Haitao Chen,Min Mao,Xiaocen Liang,Da Song,Yang Li,Tao Long,Xiaoli Chen,Fang He
The chemical looping oxidative dehydrogenation (CL-ODH) of ethane represents a highly effective approach for converting ethane into the value-added product ethylene. This investigation focused on the synthesis of SrMnO 3 and its halide ions doped derivatives (SrMnO 3 Cl and SrMnO 3 Br) through the sol-gel method. The performance of these perovskites, employed as oxygen carriers in CL-ODH of ethane, was explored. The results unveiled several advantageous outcomes arising from the incorporation of halide ions (Cl − and Br − ) with larger radius into the oxygen sites of the SrMnO 3 perovskite. Halide ions doping notably induced cell volume expansion and enhanced lattice fringe spacing. Furthermore, it contributed to elevated oxygen vacancy concentration, increased Mn 4+ /Mn 3+ molar ratio, and improved oxygen ions mobility within the bulk lattice. Fixed-bed experiments demonstrated that these redox catalysts, doped with halide ions, exhibited outstanding activity and stability during cycling tests, exhibiting enhanced both ethylene selectivity and yield in CL-ODH of ethane. In summary, the introduction of halide ions into SrMnO 3 emerges as a promising strategy for enhancing the performance of CL-ODH in ethane conversion for SrMnO 3 based oxygen carriers. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
研究领域:
化学工程
·
催化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2021
·
IF 7.147
Genyang Tang,Jing Gu,Zhen Huang,Haoran Yuan,Yong Chen
Biomass-derived chemical looping gasification (BCLG) is a novel technology for lignocellulose energy applications . Ca–Fe oxygen carriers have been proven to be a potential material for efficient lignocellulose conversion and hydrogen-enriched syngas production in process studies. In this study, Thermogravimetry-mass spectrometry (TG-MS), pyrolysis chromatography-mass spectrometry (Py-GC-MS) and fixed-bed experiments were conducted, and the cellulose BCLG product was analyzed to explore the mechanism of reaction between Ca–Fe OCs and biomass char or volatiles. The mechanism of the synergistic effect of Ca–Fe was analyzed to explain the characteristics of the OCs. The results suggest the Ca-based materials act as catalysts to promote the decomposition of cellulose monomers at primary reaction and char at secondary reaction, and also promote the reforming and oxidation of volatiles by chemisorption . Ca participates in the construction of inert substances, such as Ca 2 Fe 2 O 5 , to avoid the deep oxidation of CO and H 2 . Fe-based material supplies oxygen and promotes the reforming of volatile. Compared with Fe 2 O 3 and CaO/Fe 2 O 3 , CaFe 2 O 4 shows a better performance on carbon conversion and H 2 production below 850 °C.
研究领域:
能源工程
·
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）