CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2025
·
IF 3.9
Tallat Munir,Ming Liu,Shiyang Bai,Jihong Sun
The effective removal of multiple metal ions from aqueous solutions in a single-treatment process was explored using modified natural clinoptilolite (NCP). Batch adsorption experiments were conducted to evaluate the impact of critical factors, such as adsorbent dosage, contact time, adsorbate concentration, pH, and temperature, on the removal efficiency. The modified NCP achieved maximum adsorption capacities of 81.4, 78.4, 75.2, 72.2, and 68.8 mg·g −1 for Cd 2+ , Fe 3+ , Ni 2+ , Mn 2+ , and Sr 2+ , with removal efficiencies of 95.0 %, 90.1 %, 90.0 %, 86.5 %, and 82.5 %, respectively, at pH 3.0 and 25 °C for Fe 3+ , and pH 7.5 and 85 °C for the others. Adsorption kinetics followed the pseudo-second-order model while intra-particle diffusion, analyzed via the Weber-Morris model indicated that pore diffusion was a dominant mechanism, particularly for Fe³⁺. The Langmuir isotherm provided the best fit to the equilibrium data. Thermodynamic analysis confirmed the viability of the adsorption process, with Fe 3+ exhibiting exothermic adsorption, while the uptake of Mn 2+ , Ni 2+ , Cd 2+ , and Sr 2+ was endothermic. Negative entropy changes indicated enhanced ordering of adsorbed metal ions via strong electrostatic interactions. The modified NCPs demonstrated excellent regeneration capability and stability under acidic, basic, and thermal conditions. These findings provide valuable insights for designing effective multi-ion adsorption systems with enhanced performance and reliability.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Kun Zhou,Boran Wu,Lianghu Su,Xiaofeng Gao,Xiaoli Chai,Xiaohu Dai
Severe water pollution caused by excessive emissions of phosphorus (P) and nitrogen (N) into water bodies is a significant concern worldwide. In the present study, we synthesized a novel nano composite, nano-CaO 2 @clinoptilolite, for the simultaneous removal of P, COD, and N from sewage. X-ray diffraction and X-ray photoelectron spectroscopy were used to characterize the crystalline composition of the nano composite and confirm the presence of CaO 2 . The spatial distribution of nano CaO 2 particles and the microtopography of nano-CaO 2 @clinoptilolite were characterized by transmission electron microscopy and energy-dispersive X-ray spectroscopy. P uptake analysis indicated that nano-CaO 2 @clinoptilolite was highly effective for P removal over a wide pH range of 7.0–11.0, and that phosphate precipitation induced by the solubilization of Ca 2+ from CaO 2 was determined to be the main mechanism of P removal. In addition, simultaneous P, COD, and N removal efficiencies of 50.4, 74.7, and 80.7%, respectively, were obtained when nano-CaO 2 @clinoptilolite was applied to sewage samples. The realization of synergistic peroxidation, adsorption, and precipitation by nano-CaO 2 @clinoptilolite provides a novel insight into the high-efficiency purification of sewage.
研究领域:
环境科学
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水处理
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材料科学
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Ruohan Xu,Ming Liu,Tallat Munir,Shiyang Bai,Jihong Sun,Haoqian Guo,Zhongchao Sun,Xiaoyan Bai
This study explores the preparation of the Ni-based catalysts supported on clinoptilolite (CP) for dry reforming of methane (DRM) using three methods: impregnation, complex route, and one-pot synthesis. The impact of these strategies on Ni dispersion and catalytic performance was investigated. Triethylamine was utilized as a complexing agent to improve Ni dispersion, prevent catalyst sintering, and reduce carbon deposition. The physicochemical properties were characterized using X-ray diffraction patterns, Fourier transform infrared spectroscopy, Raman spectra, and X-ray photoelectron spectroscopy spectra, N 2 adsorption–desorption isotherms, scanning electron microscopy and transmission electron microscopy images, hydrogen temperature-programmed reduction and thermogravimetric analysis. The results indicate that the CP-TEA/4Ni catalyst prepared via the complex route exhibited a higher Ni content (2.84 wt%) and demonstrated the highest initial activity at 600 °C (44.5% CH 4 conversion, 43.4% CO 2 conversion). Conversely, the (3NiTEA)CP catalyst synthesized via the one-pot method confined Ni particles within the microporous structures of CP, significantly suppressing carbon deposition and Ni particle growth, and thereby ensuring exceptional stability (105 h at 600 °C). The amorphous and graphitic carbon deposition coexisted in the deactivated catalysts, whereas the I D /I G value of the deactivated CP/TEA-3Ni was higher. Furthermore, Grand Canonical Monte Carlo-Molecular Dynamics coupled simulations revealed that surface Ni clusters were conducive to enhancing CH 4 adsorption heat and facilitating CO 2 diffusion, which effectively inhibited carbon deposition. These findings underscore the role of synthetic strategies in designing high-performance Ni-based catalysts for DRM reaction, offering pathways to more cost-effective, stable, and efficient catalysts for industrial methane reforming and carbon emission reduction.
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DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yingying Cheng,Yuanye Zhuang,Shiyang Bai,Meng Ge,Jihong Sun,Jingjing Sun,Xufeng Gong
The removal of CO2 from biogas is critically important for environmental protection and energy applications yet remains technically challenging in the chemical industry. In this work, novel composite adsorbents featuring ZIF-8 uniformly dispersed on randomly oriented clinoptilolite lamellae (LCP) were designed and fabricated through a straightforward composite method. The synthesis sequentially incorporated metal precursors into LCP via ion exchange and salt addition and then introduced organic ligands to generate ZIF-8. Comprehensive characterizations, including XRD, FT-IR, N2 adsorption–desorption isotherms, SEM, and TG analyses, confirmed the physicochemical properties and structural features of the composites. The synthesized Zn-LCP/ZIF-8 materials exhibited exceptional CO2/CH4 separation performance, demonstrating ultralow CH4 adsorption capacity (<0.1 mmol/g) coupled with superior CO2/CH4 selectivity (≈28). Complementary molecular simulations using Material Studio software provided mechanistic insights into the adsorption and separation behavior, which further confirmed the superiority of the composite structure in CO2/CH4 separation. These results establish an effective strategy for biogas purification, while offering new perspectives for enhancing the CO2/CH4 adsorption selectivity.
研究领域:
环境科学
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能源技术
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材料科学
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化学工程
·
吸附
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Tallat Munir,Jiawei Zhou,Ming Liu,Shiyang Bai,Jihong Sun
A highly effective synthetic clinoptilolite (SCP) was developed and assessed for its potential in the simultaneous removal of Cd 2+ , Ni 2+ , Mn 2+ , Sr 2+ , and Fe 3+ from an aqueous solution. The present work explored the influences of SCP dosage, initial metal ion concentrations, temperature, contact time, and pH value on the adsorption performances of these metal ions. The results revealed exceptionally high adsorption capacities, reaching 2000, 1720, 1875, 1510, and 22 mg/g for Ni 2+ , Fe 3+ , Cd 2+ , Mn 2+ , and Sr 2+ , respectively. The specific surface area of SCP increased from 31.4 to 44.7 m 2 /g after five cycles. The adsorption mechanism and structure assessment were elucidated by XRD patterns and SEM images, showing that the Fe 3+ adsorption conformed to the Langmuir isotherm, while that of Mn 2+ , Cd 2+ , Sr 2+ , and Ni 2+ followed the Freundlich isotherm model with the adsorption kinetics best described by the pseudo-2nd-order kinetic model. Thermodynamic parameters showed endothermic behavior for Cd 2+ , Ni 2+ , Mn 2+ , and Sr 2+ , exothermic for Fe 3+ , and spontaneity for all metals except Sr 2+ . SCP retained over 90 % of its adsorption capacity after five regeneration cycles, maintaining structural integrity under thermal, acidic, and recycling conditions. These findings highlight SCP’s robust characteristics, reusability, and potential for sustainable heavy metal removal from wastewater.
研究领域:
环境科学
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材料科学
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高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Ming Liu,Nan Sun,Ruohan Xu,Tallat Munir,Shiyang Bai,Jihong Sun
The surfactant involvement in hydrothermal synthesis system of clinoptilolite (CP) is an effective strategy for regulating self-assemble of the aluminosilicate species. Herein, using cetyltrimethylammonium bromide (CTAB) as surfactant, the CTAB-assisted influences on nucleation behavior of CP were demonstrated via various characterizations. Especially, small angle X-ray scattering patterns were used to investigate the fractal structural evolutions of aluminosilicate species in their sol-gel phase. The results indicated that the primary building structural units with 8- and 10-membered rings appeared in the early induced stage gradually aggregated into the worm-liked particles with the prolonged crystallization time. Among them, the nucleation process was initiated by reorganization via the solution-mediated transport and thereafter appeared the pseudo-layered structures with the core (aluminosilicate species)-shell (CTAB) features at the liquid-solid interfaces. The irregulated lamellas with the heulandite structures increased in size of around 70 nm until reaching the maximum of 90 nm, then followed the occurrences of the re-dissolving and repaid growth. Especially, the lamellar nuclei growth showed the transformations from loose mass fractals to dense surface fractals with the extensions of the induced time. In which, the interfacial solvation layer thickness increased from 1.04 to 2.87 nm for CTAB-assisted CP, thicker than that (0.63–2.08 nm) for pure-CP. These demonstrations suggested that the additive CTAB in the induced stage inhibited the agglomeration of the aluminosilicate species and following growth of the crystal nuclei via the solvated attachments pathway. Finally, using the irregulated particle as an adsorbent, the CO 2 adsorption and CO 2 /CH 4 selectivity were preliminarily explored.
研究领域:
材料科学
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化学工程
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物理化学
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纳米技术
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吸附科学
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矿物学
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产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Bingying Jia,Liujie Bing,Bang Xu,Jihong Sun,Shiyang Bai
The amine (NH2)-functionalized UiO-66 was successfully anchored on disorderly layered clinoptilolite (CP) via surfactant (poly(ethylene glycol) (PEG) and poly(vinylpyrrolidone) (PVP))-assisted induction. The structural features and physicochemical parameters of the resultant UiO-66-on-CPs were characterized by powder X-ray diffraction (XRD) patterns, scanning/transmission electron microscopy (SEM/TEM) images, Fourier transform infrared (FT-IR) spectra, N2 sorption isotherms, and small-angle X-ray scattering (SAXS) patterns. The results demonstrated that the growth of UiO-66-NH2 nanoparticles facilitated the disorder degree of the crystal plane of CP along the a-axis, while the addition of PEG in the hydrothermal synthesis system of CP was conducive to the formation of a flower-like microstructure and the introduction of PVP was beneficial to the nucleation and growth of UiO-66-NH2 nanoparticles with a small size (40 nm) on the surfaces of the obtained CP-PEG lamellas. Finally, the gas-selective adsorption and separation performances of CO2 and CH4 were evaluated using the synthesized disorderly layered UiO-66-on-CP heterostructures as adsorbents, indicating that the NH2-functionalized UiO-66-on-CP exhibited a superior selective factor (3.66) of CO2/CH4. These results elucidated that the proposed approach is a promising strategy for constructing MOF-on-zeolite heterostructures, which may open an avenue to expand CP application and improve their performance.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 12
·1860
·
IF 5.3
Mingxuan Zhang,Jiawei Zhou,Chunlei Wan,Ming Liu,Xia Wu,Jihong Sun
Clinoptilolite (CP) was successfully synthesized via a hydrothermal route in the presence of polyethylene glycol (PEG), and it was then delaminated by washing using Zn2+containing acid. HKUST-1, as one kind of the Cu-based MOFs, showed a high CO2adsorption capacity owing to its large pore volume and specific surface area. In the present work, we selected one of the most efficient ways for preparing the HKUST-1@CP compounds via coordination between exchanged Cu2+and ligand (trimesic acid). Their structural and textural properties were characterized by XRD, SAXS, N2sorption isotherms, SEM, and TG-DSC profiles. Particularly, the effect of the additive PEG (average molecular weight of 600) on the induction (nucleation) periods and growth behaviors were detailed and investigated in the hydrothermal crystallization procedures of synthetic CPs. The corresponding activation energies of induction (En) and growth (Eg) periods during crystallization intervals were calculated. Meanwhile, the pore size of the inter-particles of HKUST-1@CP was 14.16 nm, and the BET specific area and pore volume were 55.2 m2/g and 0.20 cm3/g, respectively. Their CO2and CH4adsorption capacities and selectivity were preliminarily explored, showing 0.93 mmol/g for HKUST-1@CP at 298 K with the highest selective factor of 5.87 for CO2/CH4, and the dynamic separation performance was evaluated in column breakthrough experiments. These results suggested an efficient way of preparing zeolites and MOFs composites that is conducive to being a promising adsorbent for applications in gas separation.Keywords:clinoptilolite;HKUST-1;composites;fractal structures;delamination;adsorptive separations
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
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