JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 97
·期 4
·852-859
·
IF 3.174
Fengli Yang,Feifei Xia,Jie Gong,Chunzhi Zheng
BACKGROUND Hydrolysis of polysaccharides is a key step in biorefineries processes. In this study, an economic and green approach was developed to hydrolyze soluble polysaccharides (starch, inulin, etc.) into monosaccharides by a natural clay of attapulgite (ATP) modified with H 2 SO 4 (ATP S), and the catalysts were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Pyridine FTIR Spectroscopy (pyridine-FTIR), Temperature Programmed Desorption of Ammonia (NH 3 -TPD), Thermo-Gravimetric/Differential Thermal Analyze (TG-DTA). The hydrolysis of different substrate over ATP-S was evaluated. RESULTS After H 2 SO 4 modification, the total acid sites of the catalyst ATP-S increased from 65.33 to 109.46 umol g –1 , and the surface area also increased from 81.4 to 137.3 m 2 g –1 . ATP-S shows excellent activity and stability for polysaccharides hydrolysis in aqueous system. As for inulin as reactant, 98.5% of hydrolysis ratio was obtained at the moderate temperature of 95 °C for 210 min, and 75.8% hydrolysis ratio was achieved for starch. More importantly, there is no apparent decline of the catalytic activity after 4 recycles in aqueous system. In addition, the kinetic analysis was carried out, and the activation energy of the substrates were calculated. CONCLUSION Compared with other hydrolysis processes involving enzymes and homogeneous catalysis, the process in this paper is more cost-efficient and environmentally friendly, and it can easily be scaled-up and implemented in chemical and bio-based industries. © 2021 Society of Chemical Industry (SCI).
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高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2025
·Vol. 48
·期 9
·e70109
·
IF 1.6
Pengfei Yao,Guangpin Lin,Yi Su,Li Shu,Yingpin Wen,Fengli Yang
The isomerization of glucose catalyzed by attapulgite (ATP) modified by MgCl 2 was investigated. The catalytic performance of ATP on glucose isomerization was significantly enhanced after MgCl 2 modification (Mg-ATP), achieving a fructose yield of 36.5 % and a selectivity of 90.2 % in an aqueous system at 120 °C for 1 h. Combined with the characterization results, it could be concluded that the microstructure of ATP has been changed after MgCl 2 modification, leading to an increase in surface area and the number of weak basic sites, which are beneficial for the glucose isomerization reaction.
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CELLULOSE
·
2019
·Vol. 26
·期 17
·9311-9322
·
IF 3.917
Bao Yan,Li Xinqian,Tang Pei,Liu Chao,Zhang Wenbo,Ma Jianzhong
Flame-retardant treatment for cotton fabric has been raising considerable interest. However, flame-retardant treatments in many studies have drawbacks, such as releasing toxic gases, high cost and weak bonding to the matrix. In this paper, attapulgite clay (ATP) was treated by ball-milling, activation and double-bond modification. Cotton fabric was grafted to achieve mercapto functionalization. Finally, the flame-retardant cotton fabric was prepared by grafting ATP onto the surface of the cotton fabric via thiol–ene click reaction. The resultant cotton fabric showed outstanding flame-retardant properties. Its burning rate, limiting oxygen index and maximum smoke density were 5.3 mm/s, 25.6% and 14.27%, respectively. Compared with the original cotton fabric, the flame-retardant properties of the obtained cotton fabric were significantly improved. It was attributed to the as-formed more stable oxide layer decomposed by ATP during burning. Furthermore, the as-prepared flame-retardant cotton fabric did not cause any health hazards. This work is favorable for promoting the development of halogen- and phosphorus-free flame-retardant cotton fabric.
研究领域:
材料科学
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纺织工程
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高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Yekai Zhu,Dajun Chen
Inspired by the woodpile and irregular entanglement phenomenon, attapulgite (AT)-based nanofibrous membranes (NFMs) with different poly(vinyl alcohol) (PVA) contents were fabricated via a facile method consisting of pulping, handsheet making and low temperature drying process. In this study, the dispersion state and rheological behavior of AT with different PVA contents were studied. A “woodpile” structure of AT-based NFMs was proposed and discussed. AT-based NFMs showed high porosity (above 50%), high tensile strength (12.5 MPa) and elongation at break (1.9%). Furthermore, the optimized AT-9 exhibited low pore size (around 10 nm), good hydrophilicity (contact angle, 31.3°), high pure water flux (105 L m − 2 h − 1 bar − 1 ) and high rejection (0.1 MPa, 99.4%) for oil/water emulsion, suggesting a promising candidate for wastewater treatment applications. This work also provides a new insight into the design and development of inorganic-based NFMs.
研究领域:
材料科学
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环境工程
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Tingting Xu,Ruixiang Xie,Yiyu Long,Jianrong Da,Yao Xu,Guanghui Lu,Huiyang Bian,Shumei Wang,Hongqi Dai
The development of multifunctional papermaking additives has long been a research focus. Attapulgite, a naturally abundant chain-layered magnesium-aluminosilicate clay mineral, is a promising non-metallic resource. When incorporated into pulp, its notable adsorption capacity, colloidal properties, and hydroxyl-rich structure may promote compatibility with plant fibers, thereby improving paper uniformity, smoothness, and flexibility. Furthermore, owing to its high specific surface area and strong surface adsorption effects, attapulgite can be easily surface-modified through simple treatments to enhance bonding between paper fibers and fillers, reduce retention aid usage, and even serve as a functional filler. However, current challenges include irregular mining practices for raw attapulgite ores, compositional complexity, insufficient analysis of its structural and physicochemical properties, and limited research on post-modification strategies, all of which hinder its high-value applications. To address these limitations, this study utilized raw attapulgite ore as a base material. After purification via a straightforward washing method, its surface was modified with polydopamine to serve as a carrier for silver nanoparticles, yielding a highly dispersed functional attapulgite-based filler for papermaking. The modified attapulgite filler demonstrated significant performance enhancements: after paper formation, the white water turbidity decreased from 81.8 NTU to 40.3 NTU. The paper tensile index was maintained with a slight improvement, increasing from 23.97 N·m·g⁻¹ to 24.81 N·m·g⁻¹ . No significant adverse effects were observed on the bulk, opacity, or whiteness. Moreover, it exhibited favorable antibacterial activity, with inhibition zone diameters of 11.80 mm and 12.14 mm against E. coli and S. aureus , respectively. These results confirm that simple purification and modification strategies can endow attapulgite fillers with multifunctionality, providing a practical reference for future applications of attapulgite-based functional materials in the paper industry.
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高影响因子
JOURNAL OF ENVIRONMENTAL ENGINEERING
·
2019
·Vol. 145
·期 6
·04019028
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IF 1.657
Xue Zhang,Qin Lei,Xingzhang Wang,Jianhao Liang,Chong Chen,Hong Luo,Hongmei Mou,Qiulin Deng,Tinghong Zhang,Jinlong Jiang
A novel modified attapulgite has been developed. The method is based on the modification of attapulgite with humic acid, and its application is for the removal of Cr(III) in different conditions. It is characterized using Fourier-transformed infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller (BET). Then, the adsorption behaviors of as-prepared product are evaluated by static adsorption of Cr(III) from wastewater. The effect of pH, contact time, temperature, concentration, and adsorbent dosage on adsorption of Cr(III) is discussed. The results indicate that adsorption amount of Cr(III) on modified attapulgite is better than that of natural attapulgite. The temperature of the Cr(III) solution is found to have a significant influence on the adsorption amount. The Langmuir isotherm is used to describe well the equilibrium adsorption data, and the enthalpy change is evaluated by the Van’t Hoff equation. The thermodynamic analysis indicates that the adsorption is an exothermic and spontaneous process. Finally, the adsorption kinetic conformed to the quasi-first-order and quasi-second-order ratio equations.
研究领域:
环境科学
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材料科学
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化学工程
·
水处理
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2020
·
IF 3.408
Junbing Shi,Min Li
Attapulgite has nanoporous structure and is an excellent supporting material for the preparation of form stable composite phase change materials (FSCPCMs). However, the effects of surface characteristics of attapulgite on the attapulgite based FSCPCMs were unclear. In this work, the effect of surface modification on the properties of different kinds of attapulgite-based FSCPCMs was investigated. First, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (KH792) was used to modify attapulgite. Then, a series of FSCPCMs were prepared by adsorbing three kinds of phase change materials (PCM) with modified attapulgite (M-ATP). The crystallization and thermal properties of these FSCPCPMs were investigated. The results showed that, the surface modification improves the crystallinity and the latent heat of the FSCPCMs when paraffin or polyethylene glycol are used as the PCM. When the mass fraction of the PCM is 40%, the surface modification increases the latent heat of the paraffin/attapulgite FSCPCM and the polyethylene glycol/attapulgite FSCPCM by 31.5% and 27.8%, respectively. After 800 cooling and heating cycles, the thermal properties of paraffin/M-ATP and polyethylene glycol/M-ATP are still stable. The results were explained by analyzing the interaction between the PCM and the attapulgite. This study provides new ideas to improve the thermal properties of FSCPCMs through surface modification.
研究领域:
材料科学
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能源工程
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2013
·
IF 2.744
Ying Zhang,Jie Shen,Qing Li,Long Pang,Quanyuan Zhang,Zushun Xu,Kelvin W.K. Yeung,Changfeng Yi
Novel hyperbranched polyimides/attapulgite (HBPI/AT) nanocomposites were successfully synthesized by in situ polymerization. HBPI derived from novel 2,4,6-tri[3-(4-aminophenoxy)phenyl]pyridine (TAPP) and 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA). 4,4′-diphenylmethane diisocyanate (MDI) modified AT copolymerized with HBPI and the nanocomposites formed multilinked network. Chemical structure, morphology, thermal behavior, and mechanical properties of nanocomposites were investigated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), thermal gravimetric analysis (TGA), dynamic mechanical analysis (DMA), and tensile testing et.al. Results indicated that modified AT was homogeneously dispersed in matrix and resulted in an improvement of thermal stability, mechanical properties and water resistance of HBPI/AT nanocomposites.
研究领域:
材料科学
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化学工程
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高影响因子
FUEL
·
2021
·
IF 6.609
You Mu,Jun Liu,Juan Liu,Sili Ren
By chemically modifying the attapulgite (AT) using 3-Aminopropyl triethoxysilane (APTES), stearic acid (STA) and/or octadecyl trichlorosilane (OTS), AT-APTES, AT-APTES-STA and AT-OTS nanoparticle demulsifiers were prepared. The structure and morphology of the prepared materials were characterized and analyzed by FT-IR, SEM and Zeta potential. Contact angle characterization and the distribution of nanoparticle materials in the oil-water mixture showed that the AT-APTES-STA nanomaterial has good amphiphilicity and interfacial activity. The demulsification performance of various NP demulsifiers was investigated by using bottle test method. The results showed that the AT-APTES-STA nanoparticles can achieve rapid and efficient demulsification of the crude oil emulsions at room temperature in a wide pH range from acidic to weak alkaline. The increase of demulsifier dosage and demulsification temperature was helpful to improve the demulsification efficieny. However, the influence of temperature on the demulsification efficiency was limited, and good demulsification efficiency could be obtained at room temperature. Under the conditions of demulsifier dosage 900 ppm, pH 7 and temperature 25℃, the demulsification efficiency of AT-APTES-STA was as high as 96.7%. In contrast, the AT-APTES had a poor demulsification efficiency, while the AT and AT-OTS materials basically do not have the demulsification ability. By comparing the demulsification performance and the chemical structure of these modified attapulgite nanoparticles, it was concluded that a NP demulsifier with excellent demulsification performance should have the following two basic characteristics: (a) good amphiphilicity and interfacial activity; and (b) enough surface functional groups that can strongly interact with the emulsified molecules. It is believed that this work is of great significance to the design and preparation of NP demulsifiers for the crude oil emulsion.
研究领域:
化学工程
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材料科学
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石油工程
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Mengting Jiang,Hengyang Mao,Shouyong Zhou,Shuo Shi,Meisheng Li,Ailian Xue,Yijiang Zhao,Qi Zhang,Zhentao Wu
Aligned nanofibers have great application prospects in the field of electron transport and separation. In this work, a nano-attapulgite-based alignment technique was developed. The suspension was prepared from nano attapulgite (ATP), and polystyrene sulfonate sodium (PSS) was introduced to promote the dispersion and stability of ATP. The PSS can adjust the zeta potential of ATP from − 15 to − 50 mV. And the molecular dynamics results also showed that the appropriate PSS can increase the repulsion between ATP by 1.1 × 10 4 KJ·mol −1 . Then ATP layer on the glass substrate was prepared by drop coating and induced evaporation. The results showed that the stability of the suspension played a decisive role in the alignment effect of ATP. ATP would be aligned from the three-phase contact line of air, suspension and substrate, and the width of the alignment interval can reach 1.2 mm, when the content of ATP and PSS was 2 mg·mL −1 and 1 mg·mL −1 , respectively. On this basis, an improved alignment technique called “restricted evaporation” was proposed. The three-phase line was pinned many times during the restricted evaporation process , which was beneficial to the alignment of ATP, and the directional alignment interval can be increased to about 20 mm.
研究领域:
材料科学
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纳米技术
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胶体与界面科学
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高影响因子
Polymers
·
2022
·Vol. 14
·期 24
·5391
·
IF 4.967
Shiyang Zhang,Xiaochuang Lu,Mingwei Cai,Zhi Wang,Zhenjing Han,Zhiyin Chen,Rongtao Liu,Kaixin Li,Yonggang Min
Polyimide (PI) membrane is an ideal gas separation material due to its advantages of high designability, good mechanical properties and easy processing; however, it has equilibrium limitations in gas selectivity and permeability. Introducing nanoparticles into polymers is an effective method to improve the gas separation performance. In this work, nano-attapulgite (ATP) functionalized with KH-550 silane coupling agent was used to prepare polyimide/ATP composite membranes by in-situ polymerization. A series of characterization and performance tests were carried out on the membranes. The obtained results suggested a significant increase in gas permeability upon increasing the ATP content. When the content of ATP was 50%, the gas permeability of H2, He, N2, O2, CH4, and CO2reached 11.82, 12.44, 0.13, 0.84, 0.10, and 4.64 barrer, which were 126.87%, 119.40%, 160.00%, 140.00%, 150.00% and 152.17% higher than that of pure polyimide, respectively. No significant change in gas selectivity was observed. The gas permeabilities of membranes at different pressures were also investigated. The inefficient polymer chain stacking and the additional void volume at the interface between the polymer and TiO2clusters leaded to the increase of the free volume, thus improving the permeability of the polyimide membrane. As a promising separation material, the PI/ATP composite membrane can be widely used in gas separation industry.Keywords:polyimide;attapulgite;gas separation;permeability;selectivity
研究领域:
材料科学
·
化学工程
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PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Jiexiang Liu,Ruili Bai,Xiaoguang Zhang
The SB (DTAB, TTAB, CTAB, OTAB)-AP complex was obtained by modifying attapulgite (AP) with surfactant of SB (DTAB, TTAB, CTAB, OTAB). The structures were characterized by XRD, FT-IR, TGA/DTA and SEM. A new lamellar structure is formed by introducing surfactant. The basal spacing increases with the increase of alkyl chain length of cationic surfactants . Then, the beta-cypermethrin (BCT) composites of BCT/SB-AP, BCT/DTAB (TTAB, CTAB, OTAB)-SB-AP were prepared and investigated. The basal spacings of BCT composites were larger than those of SB-AP and the corresponding DTAB (TTAB, CTAB, OTAB)-AP. The existence of BCT and surfactants molecules into BCT composites was further confirmed. The BCT/DTAB (TTAB, CTAB, OTAB)-SB-AP have the smaller specific surface areas than DTAB (TTAB, CTAB, OTAB)-AP due to the increase of AP exfoliation in the presence of SB. Fabrication mechanism of BCT composites was put forward. Release behaviors of BCT were investigated and analyzed in different buffer solutions. The existence of mixed-surfactants influenced distinctly the release rates. BCT composites had the slow release property. The release behaviors were well fitted by pseudo second-order and parabolic diffusion models. This study provided a new approach to improve the utilization efficiency of pesticide and could be applied as a pesticide delivery system.
研究领域:
材料科学
·
农业科学
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高影响因子
危险品化学品经营许可证（带存储）