EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Wenjie Tan,Yili Wei,Yiwen Zhang,Ping Shen,Hua Tu,Yurou Chen,Jun Li,Shun Wang,Yadong Wu,Huile Jin
To improve the interfacial interaction between natural sepiolite (SEP) and fluororubber (FKM), an acid-activated sepiolite (GSEP) was prepared by modifying the natural SEP in inorganic acid solution. The GSEP appear fine needle-like nanostructures and has relatively higher specific surface area (181 %), maximum N 2 adsorption capacity (218 %), and purity compared to SEP. The silanol groups on GSEP formed Si-C bonds with FKM, which increased the cross-linking density of the composites, thus enhancing the mechanical and thermal conductivity of the FKM. Compared to FKM, the tensile strength, modulus at 100 % strain, hardness and initial decomposition temperature of the FKM/GSEP-15 were increased by 259 %, 150 %, 11.7 % and 14.5 °C, respectively. This work provides a new strategy for preparation of high performance FKM with high heat dissipation and high mechanical properties.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Qingqing Chai,Jiahan Dong,Xiaofang Yu,Xiaoke Zhang,Jun Li,Sheng Guo,Yiling Yang
Photocatalytic oxalic acid (OA) activation for pharmaceutical wastewater degradation based on Fe-based catalysts are usually limited by the cycle of Fe 3+ /Fe 2+ and low conversion efficiency of OA. Herein, an effective OA activator, FeOOH loaded FeWO 4 /WO 3 (FFW) heterojunction photocatalyst, were fabricated by electrostatic self-assembly for tetracycline (TC) degradation. Experimental results revealed that the introduction of FeOOH can greatly enhance the optical absorption and separation efficiency of photogenerated carriers of the FeWO 4 /WO 3 (FW) composite. Moreover, optimized FFW heterojunction exhibited the excellent photocatalytic OA activation activity and the highest OA conversion rate for TC degradation, which exhibited 97.3% photocatalytic performance for TC within 30 min under 420 nm light irradiation. The FFW heterojunction still revealed high photocatalytic OA activation activity for TC degradation even after six cycles. The possible degradation pathway of TC and photocatalytic OA activation mechanism of FFW heterojunction were also presented by ESR spectroscopy results, quenching tests, and LC-MS analysis. This work not only provides a fresh perspective on the surface photo-Fenton chemistry of catalytic redox processes, but also presents a valid reference for designing highly efficient photocatalytic OA-activation systems for pharmaceutical wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Huiting Zeng,Honghu Zeng,Hua Zhang,Asfandyar Shahab,Kang Zhang,Yanqin Lu,Iqra Nabi,Faiza Naseem,Habib Ullah
Biochar, due to its ability to remediate heavy metals and organic contaminants from polluted water is considered as an economic adsorption material. This work involved pyrolysis driven eucalyptus carbon (EC) to produce eucalyptus activated carbon (AC) through a novel mechanism of using phosphoric acid (H 3 PO 4 ) and its subsequent testing for efficient adsorption of Cr (VI) from aqueous environments . Advanced characterization techniques like XRD, SEM, BET, FTIR, and XPS were employed to characterize the structure and composition of EC and AC. The AC could remove 99.76% of Cr(VI), which was higher than EC removal rate of 25.24%. The surface area of AC increased by almost 5 times 1265.56 m 2 /g compared to EC (253.25 m 2 /g). The removal rate of Cr(VI) was highly influenced by adsorption capacity , pH, adsorption time, temperature, kinetics, and isotherm. Reaction rate kinetics , isothermal , and thermodynamic analysis revealed that the adsorption curve of AC fits well with the quasi-second-order kinetic model . AC adsorption process was a spontaneous endothermic reaction limited by intraparticle diffusion and a combination of chemical and physical adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2023
·Vol. 17
·期 2
·225-231
·
IF 0.5
Wang Lei,Miao Lei,Chen Dong-Chu,Zhang Min
The recycling use of wood sawdust to process composite boards has received much attention in recent years. To avoid the use of chemical adhesives, natural cellulose-based materials were often used as adhesives to combine wood sawdust. Rather than utilizing nanocellulose, the report
herein describes a method to prepare a robust composite board that is based on microfibrous cellulose, which is a low-cost commercial product. To effectively cross-link wood sawdust and microfibrous cellulose, phosphoric acid-activated glutaraldehyde was used as catalyst. Compared to its uncross-linked
counterpart, the modulus of elasticity and modulus of rupture of the composite board that had been cross-linked by glutaraldehyde and phosphoric acid were significantly strengthened to 3.45±0.06 GPa and 36.5±3.5 MPa, respectively. Moreover, the moisture resistance of the cross-linked
composite board was also enhanced. After soaking in water for 24 h, the mass swelling ratio and thickness swelling ratio of cross-linked composite board had only changed 49% and 21%, respectively. These performances even exceeded that of composite board prepared from nanocellulose. The method
described in this work may have applications in commercial processing and the recycling of wood sawdust.
研究领域:
材料科学
·
林业工程
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 10
·2797-2806
·
IF 3.186
Dong Yuxiao,Tong Dongshen,Ren Laibin,Chen Xingtao,Zhang Hao,Yu Weihua,Zhou Chunhui
Abstract Kaolinite, a natural, layered phyllosilicate, has been used as the solid catalyst for the hydrolysis of cellulose in our previous work. In the present study, kaolinite was activated by mineral acid and further evaluated for the hydrolysis of cellulose in water. The acid-activated kaolinite was characterized by XRF, XRD, FT-IR, BET and TG. The effects of reaction temperature, reaction time, mass ratio and water amount were investigated in the system. It was found that the highest total reducing sugars (TRS) yield of 50.2% was obtained on the kaolinite activated by 20% HNO 3 with the mass ratio of catalyst to cellulose of 0.2 and water to cellulose of 14 at 205 ℃ for 3 h. Moreover, the catalyst was easily regenerated by calcination and the yield of TRS on the regenerated catalyst changed between 50.2% and 45.2% after four times reuse. The results showed that the acid activation could influence the crystallinity and improve the specific surface area, but the high TRS yield of the activated kaolinite should be ascribed to the increasing of the interlayer Al–OH groups and the formation of inner hydrogen bonds between the octahedral sheets and tetrahedral sheets. Finally, it was suggested that this was the effective way for improving the catalytic performance by increasing the interlayer Al–OH groups on the kaolinite catalyst. Graphic Abstract
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Qiliang Yang,Pingxiao Wu,Juan Liu,Saeed Rehman,Zubair Ahmed,Bo Ruan,Nengwu Zhu
In this work, corn straw (CS) based porous carbon was prepared by one-step phosphoric acid (H 3 PO 4 ) low temperature activation. The impregnation ratios (H 3 PO 4 /CS, g/g) played an important role in the pore development. ACS 300-1 engineered at 300 °C and the impregnation ratio of 1.0 showed the maximal specific surface area of 463.89 m 2 /g with total pore volume of 0.387 cm 3 /g, attaining a high tetracycline (TC) uptake of 227.3 mg/g. The adsorption of TC onto ACS 300-1 was found tolerant with wide pH (2.0–10.0) and high ionic strength (0 – 0.5 M). The adsorption data can be fitted well by the pseudo-second order kinetic model and Langmuir isotherm model. The endothermic and spontaneous properties of the adsorption system was implied by Thermodynamic study. The findings of the current work conclude that one-step H 3 PO 4 activation is a green and promising method for corn straw based porous carbon that may be found with great potentials in antibiotic containing wastewater treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 10
·3149
·
IF 4.927
Xingtao Chen,Dongshen Tong,Zhi Fang,Zhenpeng Gao,Weihua Yu
Vermiculite is a natural mineral. In this study, vermiculite and acid-activated vermiculite was used as a solid acid catalyst for the hydrolysis of cellulose in water. The catalysts were characterized by XRD, FT-IR, and BET. The effects of time, temperature, mass ratio and water amount on the reaction were investigated in the batch reactor. The results showed that the highest total reducing sugars (TRS) yield of 40.1% could be obtained on the vermiculite activated by 35 (wt)% H2SO4with the mass ratio of catalyst to cellulose of 0.18 and water to cellulose of 16 at 478 K for 3.5 h. The acid-activated vermiculite was a stable catalyst through calcination at 628 K and the yield of TRS decreased to 36.2% after three times reuse. The results showed that the crystal structure of vermiculite was destroyed and the surface -OH groups increased after the acid treatment. However, the synergistic effect of a strongly electrostatic polarization and Brönsted acid was responsible for the efficient conversion of cellulose. The mechanism of cellulose hydrolysis on the acid-activated vermiculite was suggested. This work provides a promising strategy to design an efficient solid catalyst for the cellulose hydrolysis, and expands the use of vermiculite in a new field.
研究领域:
化学工程
·
可再生资源
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Jianxi Zhu,Ping Zhang,Yuebo Wang,Ke Wen,Xiaoli Su,Runliang Zhu,Hongping He,Yunfei Xi
In this paper, acid-activated palygorskite (APal x ) samples were prepared by a facile acid treatment method with different concentrations of HCl (0.5, 1, 3, 5 and 7 mol/L). The dynamic toluene adsorption performances of APal x were evaluated and the relevant adsorption mechanism was discussed. The prepared adsorbents were characterized using X-ray diffraction (XRD), elemental analysis, transmission electron microcopy (TEM), nitrogen adsorption-desorption isotherms and Fourier-transform infrared spectroscopy (FTIR). The results show that the palygorskite has a good resistant ability to acid attack, the structure still remains when the acid concentration is as high as 7 mol/L. Acid activation could significantly enhance the surface area (228, 250, 271, 273, 329 and 308 for Pal, APal0.5, APal1, APal3, APal5 and APal7, respectively) and porosity of palygorskite. APal5 has the best toluene adsorption capacity (90.4 mg/g) due to its highest S BET (329 m 2 /g) and V micro (0.055 cm 3 /g). The adsorption performance in terms of dynamic toluene adsorption capacities follows the order of Pal (44.6 mg/g) < APal0.5 (63.5 mg/g) < APal1 (71.3 mg/g) < APal7 (74.2 mg/g) < APal3 (75.1 mg/g) < APal5 (90.4 mg/g). APal5 can be readily regenerated by thermal desorption and has exhibited steady reproducibility after 6 cycles. These results have demonstrated that acid activation is a feasible and effective method for the structure and surface optimizing of palygorskite, enabling the APal x to become a promising candidate for the adsorption of volatile organic compounds in practical applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wenliang Sun,Rusi Hao
Herein, porous activated carbon was synthesized from highland barley straw by phosphoric acid activation and used as a conductive agent for LiFePO 4 cathodes. The morphology and microstructure are characterized by scanning electron microscopy and nitrogen adsorption and desorption. The results show that the porous activated carbon convenient three-dimensional porous microstructure. Compared with the conventional conductive agent carbon black Super P, the obtained porous activated carbon presents a high capacity of 153.63 mA h g -1 at 0.1 C, as well as an excellent rate performance and cycling stability. The simple method for the preparation of porous activated carbon as a conductive agent with an excellent electrochemical performance opens up a new opportunity of LiFePO4 cathodes for widespread applications in lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shi-Yu Feng,Sheng Li,Wan-Zhao Huang,Qi Niu,Deng-Yu Chen,Zhi-Mo Fang,Li-Juan Gao,Kai Li,Qiang Lu
With the increasing demand for cellulose acetate (CA) in industrial and daily applications, the disposal of its waste has emerged as an environmental concern. In this study, a novel and sustainable method for value-added utilization of waste CA was proposed, which involved NaOH pretreatment and subsequent catalytic pyrolysis using phosphoric acid-activated carbon (PAC) to prepare levoglucosone (LGO). The effects of pretreatment temperatures and NaOH concentrations on the physicochemical characteristics of CA were thoroughly investigated. Furthermore, the pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments were conducted to methodically assess the impacts of both pretreatment and pyrolysis conditions on the production of LGO. The results indicated that NaOH pretreatment could effectively hydrolyze the ester bonds in CA, leading to the removal of acetyl groups and a decrease in thermal stability. At a pretreatment temperature of 40 °C, a NaOH concentration of 0.5 mol/L, a catalyst/sample ratio of 1/3, and a pyrolysis temperature of 400 °C, the LGO yield could reach 11.52 wt%, much higher than that obtained from catalytic pyrolysis of CA (2.70 wt%). This study provides an efficient method for treating waste CA and demonstrates its potential for conversion into high-value chemicals, laying a solid foundation for the green recycling of waste plastics.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2016
·
IF 2.078
Shungang Wan,Zulin Hua,Lei Sun,Xue Bai,Lu Liang
This investigation emphasized the optimum preparation conditions for the chemical modification of eucalyptus sawdust biochar as a potential biosorbent to promote the removal of nitroimidazoles from aqueous solutions. By ANOVA for central composite design of response surface methodology, we found the activation temperature and impregnation ratio of 85% H 3 PO 4 to sawdust as the significant factors for maximizing the adsorption capacity of metronidazole. Optimum activation temperature, impregnation ratio, and activation time were 500 °C, 0.62, and 90 min, respectively. The Brunauer–Emmett–Teller surface area and total pore volume increased from 32.80 m 2 g −1 to 882.04 m 2 g −1 and 0.01829 cm 3 g −1 to 0.4316 cm 3 g −1 after H 3 PO 4 activation, respectively. The removal efficiencies using biochar prepared at optimum conditions were 97.1% and 96.4% for metronidazole and dimetridazole at 20 mg L −1 concentration and 1.0 g L −1 biochar dosage within 2 h. The adsorption process was described well by pseudo-second-order model, and solute transfer was controlled by both boundary-layer and intraparticle diffusion. Thermodynamic study revealed that the adsorption process was spontaneous and exothermic. The Freundlich model presented better a fit for the adsorption equilibrium. The maximum adsorption capacities for metronidazole and dimetridazole were 167.5 and 200 mg g −1 , respectively.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2017
·Vol. 13
·期 1
·e2156
·
IF 0.836
Zhengjiang Liu,Huiyan Ma,Juming Liu,Lei Xing,Lin Cheng,Jucai Yang,Baodong Mao,Qiancheng Zhang
In this work, Hangjin2 # clay (HC), a natural iron-contained clay mineral first discovered in Inner Mongolia of China, is found to be able to catalyze the heterogeneous Fenton reaction efficiently upon rational modification. After activation using dilute sulfuric acid, the HC prohibited a significantly enhanced activity for heterogeneous Fenton reaction. Via acid activation process, Fe 2+ /Fe 3+ redox can be introduced on the surface of sulfuric acid-activated Hangjin2 # clay (SHC), and Brønsted acid sites can be also created on the surface of SHC. Furthermore, Brønsted acid sites could effectively promote the generation of •OH for methyl orange (MO) oxidation and facilitate the Fe 3+ /Fe 2+ redox process. Fenton degradation of MO was used to evaluate the effect of acid activation on the catalytic activities of SHC. Experimental results revealed that the high activity of SHC was mainly attributed to the synergetic effect of the abundant acid sites on catalyst surface and the Fe 3+ /Fe 2+ redox process. In addition, quenching studies confirmed that •OH radicals were principally responsible for the degradation of MO. More importantly, MO degradation for 3 consecutive cycles demonstrated SHC exhibited reusable and stable activity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）