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  • Open Access

    ARTICLE

    Theoretical Insights into the Inhibition Performance of Three Neonicotine Derivatives as Novel Type of Inhibitors on Carbon Steel

    Yun Wang1, Zhen Wang2, Lei Zhang1,*, Minxu Lu1

    Journal of Renewable Materials, Vol.8, No.7, pp. 819-932, 2020, DOI:10.32604/jrm.2020.09395

    Abstract The adsorption process of new nicotinic derivatives on Fe (110) surface and diffusion of corrosive particles in inhibition film were studied by quantum chemistry and molecular dynamics simulation, and inhibition mechanism of inhibitor was discussed. The results indicated that the main active sites of three inhibitors are located in N atoms on the five membered ring. The inhibitor YM-1 has the strongest activity of electrophilic reaction, and the adsorption process of inhibitor molecules is polycentric chemisorption. The adsorption energy for inhibitors followed the order of YM-1 > YM-2 > YM-3. The adsorption film YM-1 more effectively impedes the diffusion and… More >

  • Open Access

    ARTICLE

    Adsorption and Desorption Characteristics of Cadmium Ion by Ash-Free Biochars

    Li Fu1,2, Xianying Xu1,2,*, Guiquan Fu2, Renduo Zhang3, Hujun Liu2

    Journal of Renewable Materials, Vol.8, No.7, pp. 801-818, 2020, DOI:10.32604/jrm.2020.09369

    Abstract The aim of this study was to investigate adsorption and desorption characteristics of cadmium ion (Cd(II)) by ash-free biochars and the adsorption mechanism. Biochars were prepared using peanut shell, bamboo, and Sophora japonica Linn. Ash-free biochars were obtained by treating the biochars with acid elution. Adsorption and desorption data from batch experiments were analyzed using the Langmuir and Freundlich models and three adsorption kinetics models (i.e., the Pseudo second-order, Elovich model, and the Intraparticle diffusion models). Results showed that the acid elution improved the pore structure of biochars, increased C content and aromatic functional group content, enhanced biochars hydrophobicity and… More >

  • Open Access

    ARTICLE

    Rice Husk Bio-Chars as Adsorbent for Methylene Blue and Ethinylestradiol from Water

    Jonathan Lacuesta1,*, Iris Beatriz Vega Erramuspe2, Liji Sobhana2, Dennis Kronlund3, Jouko Peltonen3, Soledad Gutiérrez1, Pedro Fardim2,4

    Journal of Renewable Materials, Vol.8, No.3, pp. 275-287, 2020, DOI:10.32604/jrm.2020.08861

    Abstract Biobased adsorbents are eco-friendly materials used for water and wastewater treatment and air cleaning. This research work explores the potential use of rice husk chars as a low-cost adsorbent for pollutants from water, such as methylene blue and ethinylestradiol. Rice husk chars are prepared by combustion of rice husks (RH-Char) or pre-treated rice husks (PT-Char). A third char (M-Char) supplied by a local company which uses rice husks as combustion material is also studied. The chars are characterized by field emission scanning electron microscopy (FE-SEM) in conjunction with energy dispersive X-ray spectroscopy (EDX), X-ray powder diffraction (XRD), and zeta-potential measurements.… More >

  • Open Access

    ARTICLE

    Adsorption Behavior of Reducing End-Modified Cellulose Nanocrystals: A Kinetic Study Using Quartz Crystal Microbalance

    Maud Chemin, Céline Moreau, Bernard Cathala, Ana Villares*

    Journal of Renewable Materials, Vol.8, No.1, pp. 29-43, 2020, DOI:10.32604/jrm.2020.07850

    Abstract In this work, we studied the adsorption of modified cellulose nanocrystals onto solid surfaces by quartz crystal microbalance with dissipation monitoring (QCM-D). Cellulose nanocrystals obtained from tunicate (CNC) were modified at reducing end by amidation reactions. Two different functionalities were investigated: a polyamine dendrimer (CNC-NH2), which interacts with gold surface by the amine groups; and a biotin moiety (CNC-Biot), which has a strong affinity for the protein streptavidin (SAV). QCM-D results revealed different adsorption behaviors between modified and unmodified CNCs. Hence, unmodified CNCs covered almost all the surface forming a rigid and flat layer whereas reducing end modified CNCs remained… More >

  • Open Access

    ARTICLE

    Synthesis of Poly(acrylic acid)-Grafted Carboxymethyl Cellulose for Efficient Removal of Copper Ions

    Ying Lin1, Yihua Cao1, Qingping Song1, Jiangang Gao1, Puyou Jia2,*, Hamed Alsulami3, Marwan Amin Kutbi3

    Journal of Renewable Materials, Vol.7, No.12, pp. 1403-1414, 2019, DOI:10.32604/jrm.2019.08380

    Abstract Biocompatible and high content grafted carboxymethyl cellulose-gpoly(acrylic acid) powder was successfully synthesized in an aqueous system, and used as adsorbents for the removal of Cu(II) in aqueous solution. The copolymer was characterized by FT-IR and SEM techniques. Graft copolymerization introduced a large number of carboxyl groups in the polymer and caused the micro-surface of the material to be porous. The fundamental adsorption behaviors of the material were studied. The adsorption kinetics was well fitted with pseudo-second order equation, while the adsorption isotherm preferred to be described the Langmuir equation. The maximum adsorption capacity obtained from the Langmuir model was 154.32… More >

  • Open Access

    ARTICLE

    Analysis of the Properties and Anti-Seepage Mechanism of PBFC Slurry in Landfill

    Guozhong Dai1,*, Jia Zhu2, Guicai Shi3, Yanmin Sheng4, Shujin Li5

    Structural Durability & Health Monitoring, Vol.11, No.2, pp. 169-190, 2017, DOI:10.3970/sdhm.2017.011.169

    Abstract As the landfill leachate has strong pollution on the underground water, surface water and soil. This paper develops the formula of impervious slurry with low permeability, good durability, strong adsorption and retardant based on the bentonite which is modified by polyvinyl alcohol. Through the simulation experiment, the optimum formula of polyvinyl alcohol is 0.2%. Its osmotic coefficient for 28 days is 0.53×10-8~1.86×10-8 cm/s and compressive strength is 0.5~1.5 MPa as well. This paper study on the retardant rule of the consolidation of slurry against the pollution in the leachate by self-made percolation instrument. The experiment shows that the retardant rate… More >

  • Open Access

    ARTICLE

    Study on the Preparation and Adsorption Property of Polyvinyl Alcohol/Cellulose Nanocrystal/Graphene Composite Aerogels (PCGAs)

    Yan Wu1,*, Xinyu Wu1, Feng Yang2,*, Li Xu1, Meng Sun1

    Journal of Renewable Materials, Vol.7, No.11, pp. 1181-1195, 2019, DOI:10.32604/jrm.2019.07493

    Abstract The cellulose nanocrystals/graphene composite aerogel (CGA) and polyvinyl alcohol/cellulose nanocrystals/graphene composite aerogel (PCGA) were prepared by suspension titration, tert-butanol solution replacement and freeze-drying successively. The removal rates of methyl blue (MB) from water by CGA and PCGA were evaluated and the effects of additions, adsorption time, reaction temperature and pH value of CGA and PCGA on MB removal rate were discussed. It was found that the optimal concentrations of both CGA and PCGA were 2 g∙L-1 in the adsorption reaction process and the adsorption equilibrium was reached within 120 min. The higher the initial pH value of MB solution is,… More >

  • Open Access

    ARTICLE

    Numerical Investigation of the Effect of Sorption Time on Coal Permeability and Gas Pressure

    Yi Xue1,2,*, Faning Dang2, Rongjian Li2, Fei Liu3

    CMES-Computer Modeling in Engineering & Sciences, Vol.115, No.3, pp. 345-358, 2018, DOI: 10.3970/cmes.2018.08052

    Abstract Adsorption deformation significantly affects the seepage characteristics of coal. However, effect of sorption time on coal permeability and gas pressure has not been investigated systematically. In this study, the sorption experiment of coal samples is conducted to elaborate the importance of sorption equilibration time. Then a coupled coal deformation and gas flow model is established considering the sorption characteristic and permeability evolution. This coupled model is implemented through finite element method to analyze the effect of sorption time on coal permeability and gas pressure. The simulation results reveal that the gas pressure of the coal will change with the adsorption… More >

  • Open Access

    ARTICLE

    Alginate Composite Hydrogel Bead with Multilayer Flake Structure for Dye Adsorptions

    Xiaoyu Chen*, Jie Zhu

    Journal of Renewable Materials, Vol.7, No.10, pp. 983-996, 2019, DOI:10.32604/jrm.2019.07325

    Abstract With the rapid development of textile industry, a large amount of dye-contaminated effluents was produced and caused serious environmental problem. To remove the dye from effluents, adsorption materials have been applied because of their relatively cheap, high efficiency, and easy handling. In this study, a novel composite hydrogel bead with unique multilayer flake structure was fabricated by alginate, acrylamide and attapulgite for dye adsorption. Acrylamide was grafted polymerization onto alginate to obtain alginate-g-poly(acrylamide). Then alginate-g-poly(acrylamide) was cross-linked by Ca2+ ions in present of attapulgite to form composite hydrogel bead. Scanning electron microscopy (SEM) results show that the freeze dried composite… More >

  • Open Access

    ARTICLE

    Modeling Water Adsorption and Retention of Building Materials From Pore Size Distribution

    Abdelkrim Trabelsi1,*, Zakaria Slimani1, Akli Younsi2, Joseph Virgone1, Rafik Belarbi2

    Journal of Renewable Materials, Vol.7, No.6, pp. 547-556, 2019, DOI:10.32604/jrm.2019.04426

    Abstract Water adsorption and capillarity are key phenomena involved during heat and moisture transfer in porous building materials. They account for interaction between solid matrix, liquid water and moist air. They are considered through Water Vapor Adsorption Isotherm (WVAI) and Retention Curve (RC) functions which are constitutive laws characterizing water activity within a porous medium. The objective of this paper is to present a water vapor adsorption and retention models built from multimodal Pore Size Distribution Function (PSDF) and to see how its parameters modify moisture storage for hygroscopic and near saturation ranges. The microstructure of the porous medium is represented… More >

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