Molecular Catalysis
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2021
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IF 5.062
Haijun Guo,Shuai Ding,Hairong Zhang,Can Wang,Fen Peng,Lian Xiong,Xinde Chen,Xinping Ouyang
The acid-activated Palygorskite (H + -PAL) was applied to support Cu(M)NiCoB amorphous alloy catalysts with high-activity and self-regeneration ability for selective hydrogenation of butyl levulinate (BL) to γ-valerolactone (GVL). The catalysts were characterized by ICP-OES, nitrogen physisorption, XRD, FE-SEM, TEM, XPS, H 2 -TPD, NH 3 -TPD and FTIR-pyridine adsorption techniques. Compared to the unsupported Cu 0.5 Ni 1 Co 1 B catalyst, the Cu 0.5 Ni 1 Co 1 B/H + -PAL catalyst showed the highest GVL yield of 96.3 % with BL conversion of 99.7 % at 200 °C. When Mo was doped into the Cu 0.5 Ni 1 Co 1 B/H + -PAL catalyst, the GVL yield showed gradually increase to 95.7 % with BL conversion of 100 % after five times run. The high activity and self-regeneration ability was attributed to the Mo doping effect and the synthetic effect between Cu hydrogenation active species and H + -PAL support. Various characterization results indicated that Mo acted as both structural promoter to improve the dispersion of metallic Cu and CuMoNiCoB amorphous alloy and electronic promoter to enhance the formation and increase the fraction of Cu + species. In addition, the incorporation of Mo provided more Lewis acid sites to promote BL conversion to GVL and GVL conversion to 1,4-PDO and n-PeOH. On the basis of characterization and catalytic performance testing results, the synergistic effect between CuMoNiCoB amorphous alloy and Cu 2 O/Cu hydrogenation sites and Lewis/Brønsted acid site of H + -PAL support is considered to be the key to produce GVL.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Qingze Chen,Runliang Zhu,Liangliang Deng,Lingya Ma,Qiuzhi He,Jing Du,Haoyang Fu,Junping Zhang,Aiqin Wang
A low-cost and scalable strategy for the synthesis of the hierarchically porous and hydrophobic adsorbent for volatile organic compounds removal remains a challenge. In this work, a novel silicon/silicon oxide (Si/SiO x ) composite with hierarchical porosity and hydrophobicity was successfully designed from natural palygorskite via a one-pot synthesis strategy, which could be promising in the scalable production due to the cost-effective precursor and simple procedure. The insufficient reduction of palygorskite during the molten salt-assisted magnesiothermic reaction led to the formation of hydrophobic crystalline silicon and the maintenance of amorphous silica framework. The results showed that the Si/SiO x composite possessed the large specific surface area (~307 m 2 g −1 ) and hierarchically porous structure ( i.e. , micro-, meso-, and macropores). As adsorbent for benzene molecules, the Si/SiO x composite exhibited much better static and dynamic benzene adsorption capacities (585.7 and 316.2 mg g −1 , respectively) than raw palygorskite (265.7 and 166.1 mg g −1 , respectively). The excellent benzene adsorption performance of the Si/SiO x composite could be attributed to the large specific area (offering ample adsorption sites) and hierarchical porosity (facilitating the diffusion/mass transfer process). Moreover, the Si/SiO x composite maintained a high adsorption capactiy for benzene under humidity condition (238.7 mg g −1 , with the adsorption efficiency of 76%). Our work provided a universal one-pot method from clay mineral to the hierarchically porous and hydrophobic Si/SiO x composite, and this novel product could be used as an attractive adsorbent for the practical removal of volatile organic compounds.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Jing Ouyang,Wei Gu,Yi Zhang,Huaming Yang,Yeling Jin,Jing Chen,Jinlong Jiang
Millimeter-sized spheres were prepared in this work as potential solid sorbents for industrial-scale CO 2 capture due to their low cost, excellent adsorption capacity and reusability characters. The naturally abundant palygorskite was smashed with jet pulverization, and then acid treated to increase its surface area from 148 to 390 m 2 /g. Then the tetraethylenepentamine (TEPA) functionalized acid-modified palygorskite (MPA) was synthesized via chemical impregnation. In addition, MPA spheres (MPAS) with average size of ∼3.6 mm were produced by a pellet machine. The prepared solid sorbents were characterized using X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and N 2 adsorption–desorption isotherms treated by BET (Brunauer-Emmett-Teller) analysis. The thermogravimetric analysis indicated that the CO 2 adsorption capacity of nature palygorskite (0.63 mmol/g) could be enhanced through amine modification. The MPAS-50 had the best CO 2 adsorption capacity (2.63 mmol/g) and excellent repeatable adsorption ability, according to the CO 2 adsorption tests. The results indicated that the TEPA-functionalized palygorskite sphere is a promising solid sorbent for CO 2 capture in industrial green house gases controlling fields.
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高影响因子
CLAY MINERALS
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2024
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IF 1.1
Qihui Wang,Xiaoli Liu,Chao Jiang,Xingpeng Wang,Linlin Wu,Huiyu Li,Weiliang Tian,Yongjun Feng
Palygorskite (Pal) shows great potential for physical, chemical and biological uses due to its colloidal, catalytic and adsorption properties. Pal mines, however, are facing the challenge of low-grade materials (5–15%), making it difficult to use Pal in emerging fields such as new materials, environmental protection and health. Therefore, there is an urgent need to develop an efficient method for separating and purifying Pal to obtain high purity levels. Hence, we have developed a dispersant-assisted rotating liquid film reactor separation strategy based on sodium hexametaphosphate as the dispersant. This strategy utilizes the double electron layer of Pal and the density difference between impurities to achieve effective disaggregation and purification of Pal bundles through the promotion of repulsive driving effects. Under optimal conditions, the purity of Pal can be increased from less than 10% to over 80%. This research presents a novel approach to the efficient refining of low-grade Pal. The crudely purified Pal’s adsorption capacity for methylene blue increased from 84.2 to 256.4 mg g–1.
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高影响因子
Desalination and Water Treatment
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2016
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IF 1.272
Zilong Zhao,Dafang Fu,Binsheng Zhang
Novel strategy to synthesize palygorskite-supported surface molecularly imprinted polymer (SMIP) for bisphenol A (BPA) template was presented. Fourier transform infrared, scanning electron microscopy, and elemental analysis were employed for the characterization of the resulting composites. When compared with the molecularly imprinted polymer, the SMIP exhibited more excellent affinity and selectivity towards BPA in aqueous solution, with the affinity constant (b) of 1.929, the Freundlich constants (KF) of 25.758, and the distribution coefficient (Kd) of 128.390. The adsorption behaviors of the SMIP were well described by Freundlich isotherm model and the pseudo-second-order model. Moreover, the sustainable reusability of the SMIP without significant loss in rebinding capacity was affirmed in four repeated cycles. These results demonstrated the potential of the prepared SMIP as an advanced separation materials for the elimination of specific endocrine disruptor in aquatic environment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
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IF 4.058
Wenbo Wang,Guangyan Tian,Zhifang Zhang,Aiqin Wang
Silicate materials have been frequently used as stable, low-cost and efficient adsorbents for the removal of dyes and heavy metal ions from aqueous solution. Herein, at the aim of designing new adsorbent with higher adsorption capacity, natural palygorskite (PAL) was modified via a one-step hydrothermal process by introducing sodium silicate and magnesium salts. The effect of Si/Mg dosage ratio on the structure and physico-chemical features of the adsorbent was investigated, and its adsorption capability for Methylene blue (MB) and Cu(II) ions was intensively evaluated. It was found that Si/Mg dosage ratio is the key to control the adsorption properties of the adsorbent. The active magnesium silicate could be formed around PAL at the moderate Si/Mg dosage ratio, and even the undesirable quartz impurities without adsorption activity in the natural PAL minerals may transform as amorphous magnesium silicate with higher adsorption activity in this process. The adsorbent shows greater BET specific surface areas (407.3 m 2 /g), ideal surface charge distribution and superior adsorption capacity to MB and Cu(II) ions, with the maximum adsorption capacity of 527.22 mg/g for MB and 210.64 mg/g for Cu(II) ions at the Si/Mg dosage ratio of 2:1. The MB molecules and Cu(II) ion could be almost completely removed from 100 mg/L of MB solution and 25 mg/L of Cu(II) solution by the adsorbent, respectively, which is far away higher than that of raw PAL. The electrostatic attraction, ion exchange and chemical association of –Si–O − groups contribute to the enhanced adsorption for MB or Cu(II) ions.
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高影响因子
APPLIED CLAY SCIENCE
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2021
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IF 5.467
Peixun Zhai,Haibo Liu,Fuwei Sun,Tianhu Chen,Xuehua Zou,Hanlin Wang,Ziyang Chu,Can Wang,Meng Liu,Dong Chen
As a natural and environmentally friendly adsorbent, palygorskite (Pal) has been approved to be excellent for the adsorption of dyes . However, the spent Pal is difficult to be regenerated through normal desorption methods, and thus, becoming a solid waste. In this study, methylene blue (MB) was adsorbed by Pal, and the MB absorbed on palygorskite (MP) was carbonized at different temperatures. The carbonized MP (CMP) was used for peroxydisulfate (PDS) activation to degrade bisphenol A (BPA). The effects of carbonization temperature, pH values, PDS concentration, and catalysts dosage on BPA degradation were investigated. The results show that the MP carbonized at 800 °C (CMP800) has the best activation performance due to the high degree of carbon defectivity and high specific surface area. The CMP800 can effectively degrade BPA over a wide pH range from 3 to 9 and is extremely resistant to the effects of various anions, such as Cl − , NO 3 − , HCO 3 − , and H 2 PO 4 − . Based on quenching experiments, electron spin resonance (ESR), and electrochemical analysis results, a non-radical pathway involving electron transfer from BPA to PDS is responsible for the degradation of pollutants. Moreover, the CMP800 has a high total organic carbon (TOC) removal efficiency of 83%, high stability in three cycles, and low PDS consumption. This study demonstrates the feasibility of the treatment and utilization of the waste Pal, which also provides a carbon-based activator for the activation of PDS to degrade organic contaminants .
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高影响因子
SOIL & TILLAGE RESEARCH
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2025
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IF 6.8
Yijue Fei,Keren Jiao,Xiaoyang Liu,Baolong Wang,Rui Song,Zilin Meng,Binbin Liu,Jiaqi Wu,Chenyu Qi,Wenfeng Zhou,Yuanlin Zhu,Haixiang Gao,Shuwen Hu
This study introduces a composite amendment, containing CaSO₄, MgSO₄, Fe₂(SO₄)₃, and Palygorskite (PGS), for concurrently improving saline-alkali soil physicochemical properties and promoting crop growth via in situ soil regulation and nutrient release. Experimental results demonstrated Layered Double Hydroxide (LDH) structure formation within the amended soil after 20 days, a key in situ mineralization mechanism absent in the control. This process significantly reduced soil pH from 9.85 to 7.86 (a 20.2 % decrease) and drastically lowered CO₃²⁻ content from 33.43 g/kg to 5.12 g/kg (an 84.68 % reduction), effectively mitigating soil alkalinity. Concurrently, exchangeable Na⁺ content decreased markedly from 700.7 mg/kg to 183.67 mg/kg (a 73.8 % reduction), alleviating sodicity. Furthermore, the amendment substantially increased water-soluble nutrient ions: Ca²⁺ (1.17–30.35 mg/kg), Mg²⁺ (0.125–9.58 mg/kg), total available Fe (49.78–89.35 mg/kg), and available SO₄²⁻ (2.06–21.62 g/kg). Notably, the amendment enhanced Soil Organic Matter (SOM) retention after simulated leaching; SOM in amended soil (6.81 g/kg) remained significantly higher than the control (5.14 g/kg), indicating improved carbon stabilization. Pot experiments using ryegrass confirmed the amendment's efficacy, showing significantly enhanced germination, root length, and shoot length, even enabling immediate planting post-application. In summary, the composite amendment leverages in situ LDH formation for stable CO₃²⁻ immobilization and alkalinity reduction, while enriching the soil with essential nutrients (Ca, Mg, Fe, S). This dual action facilitates immediate crop establishment, integrating soil regulation with controlled fertilizer distribution.
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高影响因子
LANGMUIR
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2013
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IF 4.187
Xiang Cai,Jinglin Zhang,Yu Ouyang,Dong Ma,Shaozao Tan,Yilong Peng
In order to extend the antibacterial time of quaternary phosphonium salt in bacteria, palygorskite (PGS) is used as the carrier of dodecyl triphenyl phosphonium bromide (DTP), and a DTP-PGS hybrid is prepared. Antibacterial performance of this novel hybrid is investigated for both Gram-positive and Gram-negative bacteria. The results show that the DTP could be absorbed on the surface of PGS which had bacteria-adsorbed capability. The DTP-PGS hybrid, combining the advantages of PGS and DTP, display specific-targeting capability, long-term antibacterial activity, and lower cytotoxicity, suggesting the great potential application as PGS-based antibacterial powder.
研究领域:
材料科学
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抗菌技术
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纳米复合材料
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环境化学
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高影响因子
APPLIED CLAY SCIENCE
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2020
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IF 4.605
Ruilong Zhang,Zhiping Zhou,Wenna Ge,Yi Wang,Xifeng Yin,Liming Zhang,Wenming Yang,Jiangdong Dai
In this study, the unmodified PAL could catalyze the hydrolysis and condensation of vinyltriethoxysilane (VTES) to construct a novel superhydrophobic sponge possessing the rod-spherical microstructure. After the hydrophobic modification of hexadecyltrimethoxysilane (C 16 TMS), a superhydrophobic sponge with a rod-spherical microstructure (C 16 TMS/PAL-VSiO 2 /MS) was prepared, and characterized by SEM, TEM , FTIR , XPS , stress-strain, contact angle. And it showed a novel structure and excellent properties, such as outstanding elasticity (32.8 kPa), superior hydrophobic property (water contact angle of 154.1 o , and water sliding angle of 4.2 o ). In the process of oil-water separation, C 16 TMS/PAL-VSiO 2 /MS exhibited the optimal adsorption capacity of 128 ± 3 g/g of dichloroethane and the excellent separation efficiency exceeding 99.0%. It was noteworthy that the adsorption capacity and WCA did not drop significantly after 20 cycles of repeated adsorption. C 16 TMS/PAL-VSiO 2 /MS would be a promising material in oil-water separation, because of the excellent separation efficiency and the simple, economical, and easily scalable preparation method.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Jiayun Zhu,Shouyong Zhou,Meisheng Li,Ailian Xue,Yijiang Zhao,Wenbo Peng,Weihong Xing
A novel PVDF mixed matrix ultrafiltration membrane was prepared by blending PVDF with the deformed rebar-like Fe 3 O 4 –palygorskite nanocomposites (MPGS) using the chemical coprecipitation method. Fe 3 O 4 nanoparticles were anchored on the surface of the palygorskite nanofibers to form deformed rebar-like structures. MPGS were then distributed uniformly on the membrane matrix. PVDF chains firmly wrapped by the deformed rebar-like nanocomposites consequently enhanced the tensile strength of the PVDF membrane. At 7.0 wt % MPGS, the tensile strength increased from 1.59 MPa to 2.66 MPa. The overall thickness, skin layer thickness, finger-like voids, average pore size and surface roughness of membranes decreased with increasing amounts of MPGS. The rejection of the membrane increased to 99.09% at 7.0 wt % MPGS. The contact angle of membranes decreased from 99.14° (pure PVDF) to 78.76° (PVDF/7.0 wt % MPGS). On the other hand, the pure water flux of membranes increased from 123.57 L m −2 h −1 (pure PVDF) to 356.16 L m −2 h −1 (PVDF/7.0 wt % MPGS). The flux recovery rate of the mixed matrix membranes (PVDF/7.0 wt % MPGS) was as high as 80%. This was more than twice that of the pure PVDF membrane (31.6%). These results demonstrated that the deformed rebar-like structure of the MPGS played a critical role in determining the structures and properties of PVDF mixed matrix ultrafiltration membranes. The hydrophilicity, thermal stability, permeation flux and antifouling property of the mixed matrix membranes increased with addition of MPGS. As such, PVDF/MPGS membranes had excellent comprehensive properties thus making them ideal for application in numerous fields.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Xueqing Wang,Wensheng Tan,Yong Wang,Datong Wu,Yong Kong
In this study, electrocatalytic sensing of gallic acid (GA) with poly( m -phenylenediamine) (PmPD) electrodeposited on the nanocomposites of palygorskite (Pal) and ionic liquid (IL) was reported. The PmPD/Pal-IL modified electrode showed a low limit of detection (LOD) of 0.28 μM and a wide linear range from 1.0 μM to 300 μM for electrochemical sensing of GA due to the synergistic effects of PmPD, Pal and IL. That is to say, electrocatalysis of PmPD, preconcentration ability of Pal and ionic conductivity of IL contributed to the sensitive determination of GA. In addition, the fabricated PmPD/Pal-IL also exhibited high selectivity with little interferences from common organic compounds and inorganic cations, high storage stability and reproducibility in the determination of GA. Finally, the proposed GA sensor was applied in the determination of GA in real food samples, and the results demonstrated the potential of the prepared PmPD/Pal-IL as a promising GA sensor for rapid and accurate determination of GA in foodstuffs.
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高影响因子
危险品化学品经营许可证（带存储）