COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Xinxin Liu,Minmin Chang,Hui Zhang,Junli Ren
Two-dimensional bentonite nanomaterials were used as nanofiller materials to synthesize dopamine grafted carboxymethyl xylan cross-linked with polyacrylamide nanocomposite hydrogels. The properties of nanocomposite hydrogels were analyzed by FTIR, XRD , SEM, rheological analysis, swelling analysis and mechanical test. The results showed that bentonite as a nanofiller could promote the mechanical strength of nanocomposite hydrogels, in which the maximum compressive strength , maximum tensile strength and elongation at break of composite hydrogel were 42.17 kPa, 218.29 kPa and 436%, respectively. In addition, the catechol of dopamine imparted nanocomposite hydrogels with adhesion properties, and the composite hydrogels could adhere to glass, plastic, metal and PTFE .
研究领域:
材料科学
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纳米技术
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高分子化学
·
粘合材料
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DOI
高影响因子
MATERIALS LETTERS
·
2026
·
IF 2.6
Ruifeng Xu,Yi Luo,Liping Wang,Weiguo Xue,Suixin Zhang,Jiexin Qing,Changwen Ye,Yuting Chen
In this study, we report the catalytic alkylation of diphenylamine with nonene using a series of acid-modified bentonite catalysts (Al-bent, Al/Fe-bent, and Al/Zn-bent) to overcome the drawbacks of traditional catalysts for diphenylamine alkylation. The catalysts were characterized by SEM, XRD, FTIR, and XRF analyses. Key reaction parameters including catalyst dosage, molar ratio of reactants, reaction time, and temperature were systematically optimized. The Al/Zn-bent catalyst exhibited the highest activity, achieving approximately 98% conversion of diphenylamine with high selectivity toward di-nonyl-diphenylamine under the optimal conditions (catalyst dosage of 15 wt%, diphenylamine (DPA) to nonene (NON) molar ratio of 1:6.0, reaction temperature of 150 °C, and reaction time of 18 h). Additionally, the catalyst demonstrated satisfactory reusability over four consecutive cycles, which verifies its unique structural advantages and confirms its potential as an efficient, sustainable and regenerable heterogeneous catalyst for this alkylation reaction.
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产品关联
DOI
高影响因子
ACS Omega
·
2026
·
IF 5.2
Liyuan Wang,Bingbing Lai,Xiaoyu Wang,Bo Dai,Yujuan Zhang,Wenjing Lou
Traditional bentonite grease suffers from inadequate tribological properties. Layered double hydroxides (LDHs) have great potential as lubricant additives owing to their unique lamellar structure, tunable chemical composition, and high anion-exchange capacity, which enable strong interfacial interactions and stable dispersion in lubricating media. In this study, Mg Al-layered double hydroxide (MA-LDH) was synthesized as a crystalline lamellar compound with a controllable morphology and particle size. MA-LDH was prepared under hydrothermal conditions at pH 8–12 and 120–180 °C. The effects of MA-LDH synthesis conditions and additive concentration on the properties of bentonite grease were systematically investigated. Scanning electron microscopy revealed that the particle size distribution of MA-LDH became increasingly nonuniform as the pH and hydrothermal temperature increased. MA-LDH synthesized at pH 10 and 120 °C exhibited excellent particle size uniformity and dispersibility. Within the investigated additive range (0.1–12 wt %), an MA-LDH concentration of 1.5 wt % produced the best tribological performance. Compared with the base bentonite grease, the grease containing 1.5 wt % MA-LDH showed a 34.2% reduction in average coefficient of friction, an 89.2% decrease in wear volume, and a 150% increase in load-carrying capacity. The incorporation of MA-LDH optimizes load distribution, facilitates interfacial sliding, and enhances the film-forming ability, thereby improving the tribological performance of the bentonite grease.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Liying Jiang,Qichao Ye,Jianmeng Chen,Zhong Chen,Youli Gu
In this study, bentonite–Fe 3 O 4 –MnO 2 composite was synthesized by combining bentonite with Fe 3 O 4 and MnO 2 through co-precipitation. Vibrating-sample magnetometry , scanning electron microscopy with energy-dispersive X-ray spectrometry , transmission electron microscopy , Brunauer–Emmett–Teller measurements, and X-ray powder diffraction techniques were used to characterize the composite. The composite consists of Fe 3 O 4 nanoparticles orderly assembled on the surface of bentonite and an outer layer of MnO 2 sheets. The composite’s particles possess a saturation magnetization of 13.4–30.5 emu/g and a high specific surface area (203.89 m 2 /g). The adsorption behaviors of the composite in Cd(II) removal were evaluated by batch equilibrium experiments. Kinetic and isothermal data fit well the pseudo-second-order and the Freundlich models, respectively. Adsorption reached equilibrium within 30 min, and the Freundlich capacity of the composite was 35.35 mg/g. The adsorption capacity of Cd(II) increased with increasing pH and was dependent on the ionic strength . Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy showed the combination of surface hydroxyl groups of the composite and Cd(II) in the solution. The prepared composite can be easily recycled and reused by taking advantage of its magnetic properties . The results show that the designed composite is a promising absorbent for the treatment of Cd-contaminated water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Mineral Processing and Extractive Metallurgy Review
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2017
·
IF 1.219
Wencui Chai,Yanfang Huang,Guihong Han,Jiongtian Liu,Shuzhen Yang,Yijun Cao
In order to remove aluminum ions in bauxite processing wastewater, two natural clay minerals (bentonite and kaolin) were used as adsorbents. The adsorption behaviors including kinetics and isotherms were studied at much broader pH range, higher temperature, and higher Al(III) concentration by batch experiments. The adsorption mechanisms were investigated by optical microscope, zeta potential testing, and XRD analysis. The results show that Al(III) adsorption is strongly pH dependent and increases clearly with increasing pH. The pseudo-second-order kinetic model can best describe the adsorption process, and the intra-particle diffusion was not the sole rate-controlling step. The Langmuir–Freundlich model can fit best the adsorption equilibrium data, and the maximum capacities of Al(III) adsorbed on bentonite and kaolin reach to 8.52 mg g–1 and 0.58 mg g–1, respectively, at 35°C. Thermodynamic studies display that the adsorption of Al(III) onto clay minerals is non-spontaneous. The adsorption of Al(III) onto bentonite is endothermic and causes an increase in the entropy, while kaolin is exothermic and causes a decrease in the entropy. The interaction mechanisms of Al(III) with bentonite and kaolin involve electrostatic attraction, cation exchange, surface complex, and precipitation. Bentonite as adsorbent has more potential to remove Al(III) than kaolin.
研究领域:
环境科学
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吸附技术
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废水处理
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黏土矿物学
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化学工程
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DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 101
·98945-98951
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IF 3.289
Ni Xue,Luyan Wang,Meishan Pei,Youjun He,Yankai Du,Wenjuan Guo
A new adsorbent, sodium polyacrylate (PAANa) grafted onto the surface of bentonite (Bent), was successfully synthesized by a facile and green Ce(IV)-redox process, for the removal of Pb2+ from aqueous solutions. The results indicate that by this method the original layered structure of the clay can be protected along with its cation exchange capability (CEC), leading to an improved adsorption capacity. The adsorbent (Bent–PAANa) was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and N2 adsorption–desorption isotherm studies. Subsequently the effects of pH, initial concentration and contact time on the adsorption of Pb2+ from aqueous solutions were investigated. The results of the batch experiments specifically indicate that a high adsorption capacity (149.62 mg g−1) of Bent–PAANa for the removal of Pb2+ was obtained at pH = 5, C0 = 1100 mg L−1 and 25 °C. Furthermore, the adsorption kinetics of Pb2+ onto the composite followed a pseudo-second-order kinetic model. The adsorption data fitted better to a Freundlich adsorption isotherm than a Langmuir adsorption isotherm hence confirming multilayer adsorption.
研究领域:
环境科学
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材料科学
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吸附化学
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水污染控制
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功能材料
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DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2022
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IF 4.52
Yingying Han,Yan Wang,Jie Li,Jinhua Du,Zhicong Su
To elucidate the effect of bentonite and pH of apple juice on pectin methyl esterase (PME) activity and methanol content, apple juice was treated with bentonite and malic acid and incubated for 24.0 h at 20 °C and 10 °C, respectively. The treated juice was fermented at 20 °C and 10 °C, respectively. Results showed that bentonite absorbed 28.9–31.5 % of pectin and reduced 56 % of PME activity in apple juice. Whereas pH 3.0 regulated by malic acid inhibited 95.8–96.6 % of PME activity and the activity increased during fermentation owing to the increase of pH. Consequently, the lowest pectin and PME activity caused methanol content to decrease by 33.4–34.3 % in bentonite treated apple wine; while a lower PME activity caused methanol content to decrease by 11.9 % in malic acid treated fermented apple juice. A longer fermentation period at 10 °C led to a higher methanol content than that at 20 °C. Structural equation model indicated that the methanol content was directly affected by pectin in the three treatments. Whereas the PME activity directly affected the methanol content in malic acid treatment at 10 °C.
研究领域:
食品科学
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酿酒学
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生物化学
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 86
·期 5
·1017-1033
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IF 2.43
Fu Chengbin,Li Ye,Zuo Yangyang,Li Bolin,Liu Chang,Liu Dongxue,Fu Yan,Yin Yixin
It is essential to solve the problem of phosphorus pollution in urban landscape water and reduce the degree of eutrophication. In this paper, lanthanum-modified bentonite (La-B) was prepared by high-temperature calcination and liquid-phase precipitation. Then La-B was modified with chitosan to prepare a low-cost environment-friendly functional material: lanthanum/chitosan co-modified bentonite (La-BC). It can reach the adsorption equilibrium within 30 min, and the maximum adsorption capacity is 15.5 mg/g (initial phosphate concentration 50 mg/L); when the target concentration is 2 mg/L, the removal rate can reach 98.5%. La-BC has a stronger anti-interference ability to common coexisting anions SO 4 2− , HCO 3 − , NO 3 − and Cl − in the urban landscape water body. La-BC has excellent performance in weakly acidic to neutral water, and its pH applicable range has been improved, making it possible to apply in practical water. The fitting results show that the adsorption behavior conforms to the pseudo-second-order kinetic model and the Freundlich model. After 5 regenerations, the removal efficiency remained around 80%. In the actual water test results, the phosphate concentration can be controlled below 0.1 mg/L and the removal rate is above 75%. Due to its low cost and reusability, it has great potential in the practical application of phosphate removal from landscape water. La-BC high-efficiency phosphorus removal agent was prepared by high temperature calcination and liquid phase precipitation. La-BC has shown excellent competitiveness in actual landscape water application and regeneration experiments. A possible mechanism of La-BC adsorption of phosphate has been studied and analyzed.
研究领域:
环境科学
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材料科学
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水污染控制
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 3
·415-421
·
IF 1.024
Zhao Yongsheng,Li Qin,Ren Hejun,Zhou Rui
Magnetic MnFe 2 O 4 -bentonite was synthesized by chemical co-precipitation method(CCM) and applied as catalyst in heterogeneous activation of persulfate(PS) to oxidize a target pollutant, 2,4-dichlorophenol(2,4-DCP), in aqueous solutions. The surface morphology and structure of MnFe 2 O 4 -bentonite were characterized by X-ray diffraction( XRD), scanning electron microscope(SEM), energy dispersive X-ray(EDX) and X-ray photoelectron spectroscopy(XPS) analyses.The catalytic activity of MnFe 2 O 4 -bentonite for 2,4-DCP degradation was evaluated considering the effects of various process parameters, such as mass ratio of MnFe 2 O 4 to bentonite, concentration of catalyst, PS concentration, and pH. The MnFe 2 O 4 -bentonite hybrid exhibited higher catalytic activity than pure MnFe 2 O 4 . Treatment with 5 g/L MnFe 2 O 4 -bentonite at 30 °C for 240 min oxidized 92% of 100 mg/L 2,4-DCP(70.2% mineralization), whereas treatment with pure MnFe 2 O 4 under the same condition oxidized only 70% of the pollutant. This result indicate the enhanced performance of the activated PS. Moreover, MnFe 2 O 4 -bentonite exhibits stable performance with minimal loss in activity after five successive runs. Thus, MnFe 2 O 4 -bentonite could be a promising catalyst in oxidative degradation of 2,4-DCP.
研究领域:
环境科学
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化学工程
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 42
·51253
·
IF 3.125
Hao Wang,Yihang Gao,Xuhong Jia,Quanyi Liu
Present polymer inhibitors depend on a major inhibitory group to restrain bentonite hydration, and monomer design is concerned to improve the inhibition and stability through complex copolymerization. Conveniently, a homopolymer (PIL-NH 2 ) that contained primary amine and cationic imidazolium as bi-functional groups was proposed, aiming to provide two synergistic inhibitory modes. Comprehensive methods were conducted to characterize the chemical structure and inhibitory performance of PIL-NH 2 . The ζ potential absolute value of bentonite suspension was decreased by PIL-NH 2 from 28.7–33.3 mV to 4–7 mV, and the increment of bentonite particle size d 50 was observable from 1.83892 μm to over 200 μm. With water squeezed out, the lattice spacing d 001 of hydrated bentonite was reduced from 1.9070 to 1.2683 nm due to PIL-NH 2 intercalation. The ESEM images revealed that inhibited bentonite showed a tight structure with classical dehydration phenomenon, and the hydrogen bond between PIL-NH 2 and bentonite was further confirmed according to the FT-IR result. In mechanism analysis, the electrostatic attraction and hydrogen bond existed simultaneously for PIL-NH 2 to adsorb bentonite. The two adsorption modes from bi-functional groups were synergistic to improve inhibition remarkably. PIL-NH 2 maintained high performance during the whole hydration process, including crystalline hydration, osmotic hydration, and hydrated dispersion.
研究领域:
材料科学
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地质工程
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化学工程
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2025
·
IF 8
Shuteng Diao,Wenqing Ma,Yiping Wang,Xuhui Zhao,Fazhi Zhang,Xiaodong Lei
Improving saline-alkali soil requires cost-efficient and stable technologies. In this study, a novel technology combining in-situ super-stable mineralization with Ca-bentonite was successfully applied to ameliorate saline-alkali soil. A simulation experiment was conducted on Ca-bentonite in solution to validate its feasibility, and in-situ mineralization using humic acid, Fe(NO 3 ) 3 ·9H 2 O, and Ca-bentonite was performed to treat saline-alkali soil. Additionally, climate modeling and field experiments were employed to investigate the effects of this technology on soil physicochemical properties, crop growth, and crop yield. Under natural conditions, Ca-bentonite can transform into Na-bentonite via cation exchange with Na + . The results from the in-situ mineralization experiment showed that the soil pH, total content of CO 3 2− and HCO 3 − , Na + content, electrical conductivity, and bulk density decreased from approximately 10.30 to below 9.00, 7.81 to 1.53 g/kg, 7.20 to 1.51 g/kg, 2741 to 552 μS/cm, and 1.63 to 1.24 g/cm 3 , respectively. Furthermore, the germination rate of corn increased from 0 % to 83.3 % in climate simulation experiments. Field trials conducted in Inner Mongolia and Jilin, China, further demonstrated significant improvements in soil properties. The seedling emergence rates for corn and oats significantly increased, rising from 0 % to over 85 % and 95 %, respectively. Correspondingly, crop yields reached 323 kg/hm 2 for corn and 182 kg/hm 2 for oats. Together, our study introduces a novel, cost-effective, and efficient technology to enhance crop growth by mitigating soil salinity and alkalinity. This approach provides a new perspective for alleviating salt-alkali stress and contributes to the advancement of healthy and sustainable agricultural practices.
研究领域:
土壤学
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农业科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2022
·Vol. 12
·期 11
·1383
·
IF 4.501
Wangyuan Zhang,Qi Li,Yongfei Li,Sanbao Dong,Sen Peng,Gang Chen
At present, the research on aquathermolysis catalysts mainly focuses on the catalytic effect of external catalysts on the reaction, ignoring the fact that external catalysts will form complexes with in situ inorganic minerals after entering the reservoir. In this paper, we investigated the effects of transition metal complexes as external catalysts and bentonite as in situ catalysts on aquathermolysis, respectively. Meanwhile, the aquathermolysis reaction co-catalyzed by external and in situ catalysts was further investigated. The results show that the transition metal complexes exhibited good co-catalysis with bentonite. The viscosity reduction rate can reach 73.47% at 200 °C and 4 h with 0.1 wt.% of catalyst (NAD–Zn) addition. The addition of ethanol under the same reaction conditions will further increase the viscosity reduction rate to 84.59%. The results of thermogravimetric analysis, component analysis and boiling range analysis of heavy oil show that the heavy components in heavy oil are cracked into light components after the aquathermolysis. The results of elemental analysis show that the heteroatoms in the heavy oil were removed and the quality of the crude oil was improved. The results of GC–MS analysis of the model compounds showed that the process of aquathermolysis was mainly through the cleavage of C–C, C–N and C–S bonds to crack the macromolecules into small molecules, and then achieve the effect of viscosity reduction. The main mechanism of catalyst action is the acidic center on the surface of the bentonite and the coordination bonds formed by the transition metal complexes with the heteroatoms.Keywords:heavy oil;catalytic aquathermolysis;viscosity reduction;co-catalyst;ethanol;mechanism
研究领域:
石油工程
·
催化化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）