ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 3
·4461-4473
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IF 4.223
Shao Jiang,Zhang Yi,Liu Zongtang,Fei Zhenghao,Sun Yufeng,Chen Ziyan,Wen Xiaoju,Shi Weizhong,Wang Dandan,Gu Chenggang
Organic palygorskite (OP)–supported Pd/Fe nanoparticles composite (OP-Pd/Fe) was prepared by stepwise reduction method. The removal capacity of 4,4′-dibrominated diphenyl ether (BDE15) by OP-Pd/Fe was compared with other various materials. For better understanding the possible mechanism, the synthesized and reacted OP-Pd/Fe materials were characterized by TEM, SEM, XRD, and XPS, respectively. The effects of major influencing parameters on the degradation of BDE15 were also studied. Benefit from the synergistic effect of the carrier and bimetallic nanoparticles, BDE15 could be completely debrominated into diphenyl ether (DE) under suitable conditions. A two-stage adsorption/debromination removal mechanism was proposed. The degradation of BDE15 with OP-Pd/Fe was mainly stepwise debromination reaction, and hydrogen transfer mode was assumed as the dominated debromination mechanism. The removal process fitted well to the pseudo first-order kinetic equation. The observed rate constants increased with increasing Pd loading and OP-Pd/Fe dosage while decreased with increasing initial BDE15 concentration, the tetrahydrofuran/water ratio, and the initial pH of the solution. The work provides a new approach for the treatment of PBDEs pollution.
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PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Sheng Wang,Yan Wang,Yin Liu,Tianshu Zhang,Ling Bing Kong
It is an effective strategy to use clay minerals (palygorskite) to prevent the aggregation of molybdenum disulfide (MoS 2 ) nanosheets prepared with hydrothermal process. The palygorskite/molybdenum disulfide (Pal/MoS 2 ) nanocomposites presented notable microwave absorption performances, which can be optimized by adjusting the content of Pal. The sample with optimized composition has a minimum reflection loss (RL) of -59.91 dB at 9.92 GHz at a thin thickness of 2.28 mm, owing to the enhanced interface polarization and improved impedance matching . It is believed that the 2D hierarchically structured Pal/MoS 2 nanocomposites can serve as a potential microwave absorber for practical applications.
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高影响因子
CLAY MINERALS
·
2019
·Vol. 54
·期 3
·293-298
·
IF 1.787
Dong Li,Min Shen,Guofan Sun,Huiran Jin,Peng Cai,Zhihui Wang,Yeling Jin,Jing Chen,Shijie Ding
A Pickering emulsion was prepared via synergistic stabilization of a lipase and palygorskite particles. The optimum conditions for the stabilization of the Pickering emulsion, such as the concentrations of the palygorskite particles and lipase, were explored. The morphology of emulsion droplets was examined using digital optical microscopy and polarizing optical microscopy. The palygorskite–lipase co-stabilized Pickering emulsions were investigated by determination of the adsorption rate, pH and zeta potential of the aqueous dispersion, as well as by determining the contact angle values of the lipase solution on a palygorskite disc that was immersed in toluene. The catalytic performance of the immobilized lipase in the Pickering emulsion was studied via the investigation of its thermal stability, storage stability and reusability. The immobilized lipase showed greater stability than the free lipase. The lipase immobilized by Pickering emulsion retained a high level of activity even after seven periods of recycling.
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高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Dongyang Wei,Shouyong Zhou,Meisheng Li,Ailian Xue,Yan Zhang,Yijiang Zhao,Jing Zhong,Dawei Yang
Palygorskite (PGS) was incorporated into a polyvinylidene fluoride (PVDF) matrix and PVDF/PGS nanocomposite UF membranes were prepared successfully via a combination of non-solvent-induced phase separation (NIPS) and thermally-induced phase separation (TIPS) processes. The influence of the size of the PGS particles (PGS-L, 450 nm and PGS-S, 302 nm) on the membrane pore structure, morphology, mechanical strength, filtration performance and antifouling property were investigated. The results showed that the PVDF/PGS-S composite membranes had higher porosity and lower overall membrane thickness and skin layer thickness. This directly resulted in better PWF , BSA flux, BSA rejection and FRR for the membranes loaded with PGS-S, when compared with the characteristics of PVDF/PGS-L membranes. Thus, the physical structures are dominant factors in determining the separation performance of PVDF/PGS composite membranes. However, the surface roughness and thermal stability of PVDF/PGS-L membranes were greater than those of PVDF/PGS-S membranes and their surface was also more hydrophilic . Moreover, they exhibited higher mechanical strength owing to stronger binding forces and lower porosity. Thus, the composite properties of PVDF/PGS UF membranes could be adjusted by controlling the scale of the inorganic filler .
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高影响因子
POWDER TECHNOLOGY
·
2014
·
IF 2.269
Jixiang Xu,Wenbo Wang,Aiqin Wang
The nanorods of natural palygorskite exist as aggregates or bundles. High-pressure homogenization technology can disaggregate effectively the bundles or aggregates of palygorskite in water. In order to further explore the effect of the dispersion medium on the dispersion efficiency, in this paper, palygorskite was dispersed in ethanol–water mixture with the aid of high-pressure homogenization. The effects of various ethanol/water ratios on the microstructure and colloidal properties of palygorskite were investigated. It was found that the dispersion efficiency of aggregates during the homogenization process was affected as increasing the ethanol/water ratio from 0:10 to 4:6. The introduction of ethanol into the aqueous suspension of palygorskite could weaken the van der Waals forces and hydrogen bonding interaction among rods , and a stable suspension with higher shear stress and shear modulus was obtained at the ethanol/water ratio of 6:4 ( v / v ).
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Bo Chen,Yuankai Zhang,Jiayi Duan,Feng Wang
Rare earth elements (REEs) pose significant environmental challenges due to the wastewater generated during their extraction. Developing efficient adsorbents with simple, economical and eco-friendly methods for removing and recovering REEs from wastewater is highly demanded but full of challenges. This study creates a novel adsorbent ( g -C 3 N 4 /0.5DPal) for efficient REEs removal and recovery by integrating the low-grade mineral dolomite-palygorskite with g -C 3 N 4 through a "one-pot" calcination method. Characterization techniques including SEM, XRD , FT-IR, XPS , etc., were employed to analyze the structure of the g -C 3 N 4 /0.5DPal composite. Batch adsorption experiments focusing on Gd 3+ from among the REEs were conducted to evaluate the adsorption performance. The results reveal a remarkable 3.34 times increase in Gd 3+ adsorption capacity of g -C 3 N 4 /0.5DPal (192.46 mg/g) compared to raw dolomite-palygorskite (57.62 mg/g) at 298 K, highlighting the effectiveness of the modification. The adsorption mechanism involves electrostatic interactions , surface complexation, and cation-π interactions. It is worth noting that g -C 3 N 4 facilitates the conversion of dolomite to calcite during the preparation process, enhancing the Gd 3+ adsorption of g -C 3 N 4 /0.5DPal. This work offers a promising solution for the removal and recovery of REEs and the high-value utilization of low-grade minerals, addressing both environmental concerns and resource sustainability.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xiting Tao,Chunyan Zhang,Zhiming Yang,Chao Yao,Xiazhang Li
The conversion of carbon dioxide and water into fuels through artificial photosynthesis is of great significance for achieving carbon neutrality. However, this reaction faces great challenge due to the sluggish kinetics. Herein, high-entropy spinel (NiFeMnCoCu) 3 O 4 nanoparticles supported on palygorskite (Pal) were synthesized using a facile sol-gel method, and the composite was employed for photocatalytic CO 2 reduction coupled with biomass-derived 5-hydroxymethylfurfural (HMF) oxidation. The hydrochloric acid-modified Pal (H-Pal) facilitated the generation of high concentrations of oxygen vacancies in (NiFeMnCoCu) 3 O 4 , inducing a localized surface plasmon resonance (LSPR) effect, expanding the light absorption range to the near-infrared region and releasing high-energy hot electrons, thereby enhancing the photocatalyst's photothermal conversion capability. The HMF oxidation along with dehydrogenation addressed the issue of slow kinetics while harnessing the potential of biomass resources. Moreover, the high concentration of oxygen vacancies significantly improved the separation efficiency of charge carriers, favoring the enhanced photocatalytic CO 2 reduction and HMF oxidation ability of the (NiFeMnCoCu) 3 O 4 /H-Pal composite. Current study provides a novel strategy for the conversion of CO 2 and the high-value utilization of biomass.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2019
·Vol. 80
·期 5
·989-997
·
IF 1.624
Zeng Wen-Juan,Wang Cai-Yun,Wang Yu-Hui,Guo Hong-Mei,Huang Yu,Zhang Xiao-Liang
As a kind of earth-abundant and cheap natural clay mineral, palygorskite (Pal) was facilely modified by grafting with graphene oxide (GO) to fabricate GO/Pal composites for rapid removal of Pb(II) from aqueous solutions. The results of characterization confirmed that the GO/Pal composites were successfully grafted between GO sheets and Pal nanorods. The effects of pH, adsorbent dosage, adsorption time, initial Pb(II) concentration and temperature on the adsorption of Pb(II) onto the GO/Pal composites as adsorbents were systematically investigated. The maximum adsorption capacity over 106.6 mg/g was obtained within a short adsorption time of less than 1 h even at 298.15 K. The adsorption of Pb(II) was a fast process that more accurately followed the pseudo-second-order kinetic equation. This process also could be described better with the Langmuir equation model than the Freundlich model. The negative values of Δ G ° and the positive values of Δ H ° and Δ S ° indicated that it was a spontaneous, endothermic and entropy-increasing adsorption process. Compared with pristine Pal and GO powders, such the GO/Pal composites as a cost-efficient and eco-friendly adsorbents could significantly improve the adsorption properties of Pb(II) and would have potential application in the industrial wastewater treatment for rapid removal of Pb(II).
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高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Xuemin Zhong,Peng Yuan,Samahe Sadjadi,Dong Liu,Yanfu Wei
The oxidation of 5-hydroxymethylfurfural (HMF) to 2, 5-diformylfuran (DFF) is an important reaction for the conversion of renewable biomass into feedstock chemicals. In this work, palygorskite (Pal)-supported ruthenium (Ru) catalysts were developed for the efficient selective oxidation of HMF to DFF. Using natural clay mineral palygorskite as the support enabled the immobilization and dispersion of Ru nanoparticles . A 100% HMF conversion, 98% DFF yield, and 98% DFF selectivity were obtained over Ru(III)/Pal catalyst after 4.5 h under the optimal reaction conditions at 110 °C and 10 bar of O 2 in toluene. Ru nanoparticles and palygorskite synergistically achieve the excellent catalytic performance of the catalyst. The Ru metal active sites facilitate the activation of the reactants or intermediates, accelerating the formation of DFF. Furthermore, due to their different particle sizes and Ru species, the Ru(III)/Pal catalyst exhibits higher catalytic activity than the Ru(0)/Pal catalyst for the oxidation of HMF to DFF. The palygorskite-enhanced dispersion effect on Ru nanoparticles augments the catalytic activity. Moreover, the palygorskite-supported Ru catalyst showed good stability and was reused for at least five times consecutive cycles without significant loss of its catalytic activity.
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高影响因子
LAND DEGRADATION & DEVELOPMENT
·
2021
·Vol. 33
·期 1
·193-203
·
IF 4.977
Yulong Li,Chao Gao,Sashuang Rong,Jialin Gu,Huiwei Zhao,Shiming Su,Wei Liu
Cadmium (Cd) pollution in soil poses a grave threat to human health. Combining various approaches to reduce Cd accumulation in crops is an active area of research to remediate farmlands with medium-high levels of Cd contamination. The Mercapto-functionalized palygorskite (PGS-SH) and zinc (Zn) application alone or in combination were investigated to explore the reduction of Cd uptake by B. chinensis L and transformation of Cd in soil. The sole application of Zn or PGS-SH increased the biomass of B. chinensis L. and decreased the concentration of Cd in plants, but more improvements were observed from the combined application of Zn and PGS-SH. Low concentration of exogenous Zn (50 mg·kg -1 ) significantly increased the soil respiration rate (SRR) and the soil dehydrogenase activity (sDHA), while promoted B. chinensis L. growth while inhibiting Cd uptake. However, excessive exogenous Zn (≥ 200 mg·kg -1 ) significantly inhibited B. chinensis L. growth and soil microbial activity. The combined application of PGS-SH and Zn had the highest sDHA (145.59%) and lowest transport factor (TF) (27.59%) compared with the CK. The combination of PGS-SH and Zn fertilizer is a safe and effective means to reduce the accumulation of Cd in plants and restore microbial activity.
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高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Yeyang Li,Meisheng Li,Shouyong Zhou,Ailian Xue,Yan Zhang,Yijiang Zhao,Jing Zhong,Qi Zhang,Dawei Yang
The natural hydrophilic nanofiber-like palygorskite (Pal) particles were incorporated into the quaternary ammonium functionalized polysulfone (QPSf) to prepare high performance anion exchange membranes . Due to the mutual compatibility between quaternary ammonium groups in quaternized polysulfone and hydrophilic Pal particles, a hydrophilic domain could aggregate, thereby forming a hydrophilic-hydrophobic microphase separation structure. Meanwhile, the small-angle X-ray scattering (SAXS) was utilized to characterize the hydrophilic ionic cluster domain in the composite membrane. The results showed that the corresponding average inter-domain spacing of the QPSf/Pal-0.5 membrane was about 30 nm. Then, the new composite membrane had not only highly efficient hydrophilic ion transport channels but also adjustable hydrophilic-hydrophobic microphase separation structures. Compared with original quaternized polysulfone membranes, the hydroxide conductivity of the QPSf/Pal-0.5 membrane reached 93.0 mS·cm −1 at 80 °C, increasing by 48%, while the methanol permeability was kept between 4.2 × 10 −7 and 5.8 × 10 −7 cm 2 ·s −1 .
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Ruoqing Wang,Xuefeng Liang,Feng Shen,Mo Qiu,Jirui Yang,Xinhua Qi
A green, safe, and easy-operation method for the preparation of sulfonated palygorskite solid acid catalyst (PAL-SO3H) was developed by a mechanochemical process, where thiol groups (−SH) were grafted onto natural palygorskite by a high-speed shearing process with 3-mercaptopropyltrimethoxysilane in aqueous solution under mild conditions, followed by the oxidation of −SH to −SO3H groups. The as-prepared PAL-SO3H catalyst was applied in the catalytic conversion of biomass-derived xylose into furfural, and it showed excellent catalytic activity, and as high as 87% of furfural yield with 96% selectivity was achieved at 180 °C in 60 min reaction time in the γ-valerolactone–water mixture (95:5 v/v %). The PAL-SO3H catalyst was tolerant of high initial xylose loading concentration up to 120 g/L and exhibited good recyclability. This study provides a green and mild process for the synthesis of a sulfonated solid acid catalyst, which should have potential applications in many fields such as catalysis and adsorption.
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高影响因子
危险品化学品经营许可证（带存储）