APPLIED ENERGY
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2016
·
IF 5.746
Peizhao Lv,Chenzhen Liu,Zhonghao Rao
In this paper, different particle sizes of kaolin were employed to incorporate paraffin via vacuum impregnation method. The paraffin/kaolin composites were characterized by Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimeter (DSC) and Thermogravimetry (TG). The results showed that the paraffin/kaolin composite with the largest particle size of kaolin (K4) has the highest thermal conductivity (0.413 W/(m K) at 20 °C) among the diverse composites. The latent heat capacity of paraffin/K4 is 119.49 J/g and the phase change temperature is 62.4 °C. In addition, the thermal properties and thermal conductivities of paraffin/K4 with different mass fraction of K4 (0–60%) were investigated. The thermal conductivities of the composites were explained in microcosmic field. The phonon mean free path determines the thermal conductivity, and it can be significantly affected by temperature and the contact surface area. The leaks, thermal storage and release properties of pure paraffin and paraffin/kaolin composites were investigated and the composites presented good thermal stabilities.
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Waste and Biomass Valorization
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2016
·Vol. 9
·期 1
·95-101
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IF 0.915
Ning Liangmin,Liao Shengyun,Sun Yongfa,Yu Linhao,Tong Xinli
Abstract The catalytic synthesis of 2,5-diformylfuran (DFF) from 5-hydroxymethylfurfural (HMF) attracts extensive attention in the research of biomass conversion. However, it is a challenge to achieve high conversion of HMF under mild conditions with a heterogeneous catalyst, which can be easily separated and recycled. Herein, we report a novel cobalt-based catalyst (Co x O y -N@TiO 2 ) for the oxidation of HMF to DFF with 30 % aqueous tert -butyl hydroperoxide as the oxidant. A series of Co-based catalysts were prepared by a typical impregnation method, and detected by XRD, TEM and FT-IR techniques. Based on the experimental results of catalytic test, it is found that a 91 % conversion of HMF and 40 % selectivity of DFF was obtained with the Co x O y -N@TiO 2 catalyst at 80 °C within 5 h. In addition, the Co x O y -N@TiO 2 can be recycled up to five times without significant loss of activity. Graphical Abstract The efficient oxidation of 5-hydroxymethyl furfural, a biomass-derived platform compound, to produce 2,5-diformylfuran is achieved using Co x O y -N@TiO 2 catalyst under mild conditions.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 132
·期 13
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IF 1.64
Chongyi Li,Feng Xue,Enyong Ding
This is probably the first report on the synthesis of a series of novel collagen-based flocculants (CP11, CP12, and CP13) by grafting polyacrylamide (PAM) chains onto the collagen backbone, which was directly extracted from leather shavings via alkali hydrolysis. The results from FTIR, XRD, 1 H NMR, and TGA well supported that PAM chains had been successfully grafted onto collagen backbone. In addition, the micrographs of SEM revealed that the PAM grafted collagen possessed much more porous and looser surface structures in comparison with virgin collagen. Zeta potential measurement showed that the introduction of branched PAM chains helped to improve the positively charge density. Furthermore, CP12 performed the best in the kaolin flocculation with the highest flocculation rate about 24%·min −1 and could induce the generation of much larger and denser floccs for the fast settling of kaolin particles. The corresponding flocculation mechanism was also presented by analyzing the collected flocs. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41556.
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JOURNAL OF HAZARDOUS MATERIALS
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2015
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IF 4.529
Hangcheng Zhu,Yong Zhang,Xiaogang Yang,Hongyi Liu,Lan Shao,Xiumei Zhang,Juming Yao
The waste management of used flocculants is a thorny issue in the field of wastewater treatment . To natural cellulose based flocculants, utilization of hazardous cellulose solvent and simplification of synthetic procedure are the two urgent problems needing to be further improved. In this work, a series of natural dicarboxyl cellulose flocculants (DCCs) were one-step synthesized via Schiff-base route. The cellulose solvent (NaOH/Urea solution) was utilized during the synthesis process. The full-biodegradable flocculants avoid causing secondary pollution to environment. The chemical structure and solution property of the DCC products were characterized by FT-IR, 1 H NMR, 13 C NMR, TGA, FESEM , charge density and ζ-potential. Kaolin suspension and effluent from paper mill were selected to evaluate the flocculation activity of the DCCs. Their flocculation performance was compared with that of commercial cationic polyacrylamide and poly aluminium chloride flocculants. The positive results showed that the NaOH/Urea solvent effectively promoted the dialdehyde cellulose (DAC) conversion to DCC in the one-step synthesis reaction. The DCCs with the carboxylate content more than 1 mmol/g exhibited steady flocculation performance to kaolin suspension in the broad pH range from 4 to 10. Its flocculation capacity to the effluent from paper mill also showed excellent.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
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2016
·Vol. 182
·期 1
·55-66
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IF 1.606
Fu Ruijie,Yao Kai,Zhang Qisheng,Jia Dongying,Zhao Jiayuan,Chi Yuanlong
A series of collagen hydrolysates (CHs) were prepared from pigskin shavings by using pepsin (PCH), trypsin (TCH), Alcalase (ACH), HCl (HCH), and NaOH (NCH). Their physicochemical properties, including degree of collagen hydrolysis, molecular weight distribution, electric charge, and microstructure, were investigated, and their flocculation performance was evaluated in a kaolin suspension, at varied pHs and concentrations. PCH exhibited high flocculation capability under acidic and neutral conditions, and its efficiency for removing suspended particles was approximately 80% at a concentration of 0.05 g/L. TCH, ACH, HCH, and NCH showed almost no flocculation capability. The flocculation capability of PCH could be mainly due to a combination of optimal molecular weight distribution and electric charge. This study could provide an environment-friendly natural flocculant and also proposes a promising approach for the reuse of collagen wastes.
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COMPUTERS AND GEOTECHNICS
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2024
·
IF 5.3
Yijie Wang,Liming Hu,Zhen-yu Yin
The vapor sorption isotherm (VSI) of soil serves as a basic tool in geotechnical engineering , widely employed for characterizing the structural parameters of soil. Micropores are commonly found in soil, significantly altering the VSI and impacting the characterization of structural parameters. Nonetheless, these micropores are often overlooked in relevant analyses. Moreover, the characterization process relies on the utilization of theoretical models to fit the VSI. However, the commonly used models are not designed for VSI, raising concerns about their reliability. To investigate the influence of micropores on VSI and assess the reliability of various characterization models, this study used molecular simulation techniques to generate VSIs for kaolinite samples with different pore sizes. The simulation results reveal the effects of pore size on VSI shape, shed light on the influence of soil surfaces on pore water density and orientation, and highlight the important role of hydrogen bonds in water retention within the kaolinite pores. Furthermore, the reliability of three structural parameter characterization models, namely BET, DR, and a s plot, was evaluated with the aid of the explicit geometric dimensions in molecular models, and the mechanisms responsible for their reliability were elucidated. This study deepens the understanding of VSI and provides crucial references for the characterization of soil structural parameters.
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Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Jiayan Zhu,Lishan Zhang,Junyong Liu,Shan Zhong,Zengxian Wei,Pin Gao,Jinyou Shen
In this study, we present a novel approach to fabricate a granular ceramic material utilizing a composite of nano zero-valent iron (nZVI), carbon, and kaolin. The optimal mass ratio of the prepared material was kaolin, nZVI, activated carbon, and appropriate additives = 40%:40%:10%:10%. The resulting composite demonstrated microelectrolysis effects, enhancing its reactivity for pollutant removal. Activated carbon within the composite significantly increased the interlayer spacing of kaolin, and improved material performance. Furthermore, the addition of activated carbon proved effective in preventing the agglomeration of nZVI, and ensuring a stable and efficient pollutant removal process. The results of 40-day column experiments showed that nano iron-carbon-kaolin micro-electrolysis particles (NIMP) consistently demonstrated stable trichloroethane (TCE) removal with an average removal rate of 88.15 ± 3.24%. Batch experiments confirmed that the synthesized material can achieve complete dechlorination of TCE, which was consistent with density functional theory calculations. The developed material exhibited a robust soil structure and high reactivity for pollutant reduction, making it a promising substrate filler for efficiently degrading refractory organic pollutants. It holds great potential for applications in areas such as water treatment and soil remediation.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Liming Hu,Abdou Latif Imorou,Zhixin Chen,Henglin Xiao
Efficient slurry dewatering is critical in numerous engineering and environmental applications. Traditional electro-osmosis methods often struggle with uneven electrical field distribution and electrode corrosion, limiting their performance. To address these challenges, this study presents an enhanced pressurized electro-osmotic dewatering (EPEOD) technology featuring a three-electrode array configuration and a fabric electrode (FE) material. This configuration offers bi-directional water migration, superior corrosion resistance, and uniform electric current distribution, enhancing dewatering efficiency significantly. Experiments were conducted using slurry samples of bentonite and kaolin in varying proportions to assess the variation in dewatering performance and soil properties. The findings demonstrated that the proposed technique significantly improved water removal, reducing the initial moisture content from 325 % to a final moisture content of 94.3 % for a 100 % bentonite sample. This performance was notably better than that of other methods, such as mechanical dewatering (MD), electro-osmotic dewatering (EOD), and pressurized electro-osmotic dewatering (PEOD) with electrode reversal (ER) technique with a final water content of 130.4 %. The electrode array configuration and the fabric electrode minimize corrosion and reduce electrical potential loss at the electrode-soil interface. Ion concentration profiles indicated that Ca 2+ ions are primarily responsible for the transportation of pore water toward the cathode. The EPEOD process was shown to alter soil properties, including reductions in liquid limits (LL) and plasticity indices (PI). Overall, this study highlights the effectiveness of the proposed novel EPEOD technique in enhancing slurry dewatering performance by implementing a three-electrode array configuration and a fabric electrode material.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2024
·Vol. 31
·期 20
·29232-29245
·
IF 0
Fan Xiulei,Cao Binwen,Wang Shenpeng,Li Huixian,Zhu Mingxian,Sha Haidi,Yang Yangyang
Tire–road wear particles (TRWPs) are formed by friction between the tire and the road. TRWPs are ubiquitous across the globe, especially in sediments. However, the possible effects of TRWPs on tetracycline (TC) in aquatic sediments are unknown. To investigate the potential role of TRWPs as carriers of co-pollutants, this study investigated the pore surface properties and TC adsorption behavior of TRWP-contaminated sediments and explored the TC behavior in water sediments, as well as the role of aging processes and TRWPs abundance. The results showed that the surface morphology of TRWP-contaminated sediments changed and the adsorption capacity of sediments to TC increased. The TC adsorption capacity of sediments contaminated by 2% TRWPs increased from 3.15 to 3.48 mg/g. Moreover, the surface physical and chemical properties of TRWPs after UV aging changed, which further increased the TC adsorption capacity. The TC adsorption capacity of the sediments contaminated by aged TRWPs increased from 3.48 to 3.65 mg/g. Changing the proportion of aged TRWPs, we found that the adsorption capacity of sediments contaminated by different proportions of TRWPs for TC was 2% > 1% > 0.5% > 4% > blank sediment. These results may contribute to predicting the potential environmental risks of TRWPs in aquatic sediments.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Shuqian Meng,Xiaoqian Ju,Jingwen Wang,Baolu Cui,Yuxi Liu,Haosheng Ma,Dechao Wang,Zhiyuan Yang
Carbon capture, utilization, and storage (CCUS) is a crucial technology for achieving carbon reduction targets. The key to CCUS technology lies in developing and designing efficient and low-cost CO 2 capture materials. Metal-organic frameworks (MOFs) have emerged as promising CO 2 adsorbents in the field of carbon capture. However, high agglomeration of nanoparticles and high cost have severely hindered the application of MOF-based solid adsorbents. This study employs an in-situ growth method to prepare a novel “corncob-shaped” PHNT@ZIF-8 composite material. During the reaction process, surface modification of halloysite nanotubes (HNT) enhances the interaction between HNT and ZIF-8. The resulting PHNT@ZIF-8 exhibits an enhanced CO 2 adsorption capacity of 1.48 mmol/g. Notably, the functionalized PHNT@ZIF-8 as CO 2 adsorbents demonstrated significant adsorption properties: a high specific surface area of 409.74 m 2 /g, good selectivity in simulated flue gas composition of 15%/85% (CO 2 /N 2 ) (39.1), excellent thermal stability, and superior regenerability. Moreover, PHNT@ZIF-8 adsorbs CO 2 primarily through van der Waals forces, which involve low energy and are easily reversible. After eight adsorption–desorption cycles, CO 2 capacity retention rate remains as high as 93% (1.37 mmol/g). This work enriches the repertoire of solid CO 2 composite adsorbents, providing a novel pathway for enhancing CO 2 adsorption performance.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Weiyong Zhan,Guansheng Liu,Enzhu Hu,Jiaquan Zhang,Lili Huo,Hua Zhong
In the study, cotransport of fullerene nanoparticles ( n C 60 ) and mobile clay colloids (illite (ILL), kaolinite (KL), montmorillonite (ML)) in aquifer porous media and its relation to the aggregative interaction between these two types of particles was investigated. Minimal interaction occurred between n C 60 and ILL, resulting in unaffected transport. Strong heteroaggregation between ML and n C 60 resulted in not only significant retention of both particles during their cotransport but also the retention of n C 60 in the media pre-injected with ML. Strong homoaggregation of KL caused strong straining effect and consequently retention of both KL and n C 60 during their cotransport, however, the pre-emplacement of KL did not cause retention of n C 60 during the sequential injection of KL and n C 60 . Such aggregation behaviors were well demonstrated by the adsorption-sedimentation experiment, microscopic observation, the size and zeta-potential test, and model simulation. Based on the surface chemistry analysis, divalent-cation bridging between ML and n C 60 and hydrogen bonding between KL particles were responsible for the heteroaggregation and the homoaggregation, respectively. The study demonstrated the specificity of the aggregation between the mobile clays and n C 60 to the chemistry of the clays and its consequent effect on the cotransport of the particles, which is critical for assessment of the environmental risk of n C 60 .
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ANALYST
·
2024
·
IF 3.6
Jiujiang Wang,Dawu Li,Jianghua Zhang,Zijian Gao,Jinke Han
Latent fingerprints (LFPs) are invisible impressions that need to be developed before being used for criminal investigation; however, existing fingerprint visualization techniques face challenges, such as complex preparation and poor contrast. To advance practical fingerprint detection, green-emissive micron-sized curcumin/kaolin composites were synthesized via a facile and cost-effective one-step physical cross-linking method, which exhibited unprecedented performance in developing diversified marks, including LFPs, knuckle prints, palm prints, and footprints, with clear three-level details on various substrates. Notably, the powders successfully developed LFPs that were aged for 30 days and even up to 100 days, meeting the stringent requirements for comprehensive forensic application. Afterward, a novel method, termed Fingerprint Fluorescence Intensity Ratio (FFIR), was developed to quantify the contrast between fingerprint signals and background noise and to compare the efficacy of full-color developing agents. Compared with the existing grayscale conversion strategy, the proposed FFIR method achieved tunable multi-color fingerprint image enhancement for the first time, which helped to eliminate background fluorescence interference and improved visual perception. The feasibility of FFIR and its sensitivity in tracking image capture parameters were demonstrated by the established mathematical model. Hence, the newly synthesized modified composites and the mathematical model-validated method demonstrate profound practical significance in comprehensive fingerprint imaging.
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