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  • Open Access

    ARTICLE

    Preparation of Kenaf Biochar and Its Adsorption Properties for Methylene Blue

    Xin Wan1,2,#, Zhigang Xia3,4,#, Xiaoli Yang1,2, Chengfeng Zhou2, Yuanming Zhang1,2, Haoxi Ben1,2, Guangting Han1,2, Wei Jiang1,2,*

    Journal of Renewable Materials, Vol.10, No.12, pp. 3391-3404, 2022, DOI:10.32604/jrm.2022.021102

    Abstract The toxic dyestuffs from printing and dyeing wastewater have caused serious damages to the ecological environment, thus exploring effective methods to remove them having become a key topic. Here, a series of biochar samples were synthesized form kenaf to adsorb methylene blue (MB), which was acted as the dye representative for the test of adsorption capacity due to the presence of abundant double bond and aromatic heterocyclic ring. By tuning the raw materials and pyrolysis temperature, a super adsorption capacity about 164.21 mg·g–1 was obtained over the biochar that pyrolyzed at 700°C with the kenaf fiber as raw material. Through… More >

  • Open Access

    ARTICLE

    Effect of Active Zeolite in the Pyrolysis of Polypropylene and Low Density Polyethylene Types of Plastic Waste

    Aman Santoso1,*, Amirotus Sholikhah1, Sumari Sumari1, Muhammad Roy Asrori1, Anugrah Ricky Wijaya1, Rini Retnosari1,2, Ihsan Budi Rachman1,3

    Journal of Renewable Materials, Vol.10, No.11, pp. 2781-2789, 2022, DOI:10.32604/jrm.2022.021401

    Abstract Plastic is a basic need for humans, but it has also caused big problems for the environment. Then, the purpose of this study was to determine the effect of the type of plastic and the addition of a zeolite catalyst on the oil yield from the pyrolysis of plastic waste. The research stages were natural zeolite activation, pyrolysis reactor settings, pyrolysis of plastic waste (PP and LDPE types), and characterization. The results showed that the used natural zeolite had a mordenite phase and activated natural zeolite had a higher Si/Al ratio than the inactivated one. The addition of a zeolite… More > Graphic Abstract

    Effect of Active Zeolite in the Pyrolysis of Polypropylene and Low Density Polyethylene Types of Plastic Waste

  • Open Access

    ARTICLE

    Synthesis and Characterization of Hydrogels Based on Potato Starch/Poly(vinyl Alcohol)/N,N′-Methylenebisacrylamide

    Diego David Pinzón-Moreno*, Eder Clidio Vicuña-Galindo, José Vulfrano González-Fernández, José Luis Soto-Gonzales, María Verónica Carranza-Oropeza*

    Journal of Renewable Materials, Vol.10, No.8, pp. 2179-2201, 2022, DOI:10.32604/jrm.2022.019793

    Abstract Several hydrogels were synthesized by free-radical polymerization in an aqueous medium based on potato starch (PS), poly(vinyl alcohol) (PVA), and N,N′-Methylenebisacrylamide (MBAm), being possible to study these hydrogels as a function of the proportion of components incorporated. In this way, the products generated from the synthesis were characterized by swelling and deswelling kinetics, the first swelling being verified with Schott and statistical models, allowing to contrast the proximity between the experimental and theoretical behavior. Additionally, water retention in soil (R%), spectroscopy (FTIR), morphological (SEM), and thermal (TGA and DSC) analysis allowing to know the intrinsic characteristics of the material, increasing… More >

  • Open Access

    ARTICLE

    Analysis of Highway Asphalt Modified with Recycled Rubber and Waste Plastics

    Aimin Zhang, Mingzhi Lu*

    FDMP-Fluid Dynamics & Materials Processing, Vol.18, No.4, pp. 907-918, 2022, DOI:10.32604/fdmp.2022.018995

    Abstract In this study, it is shown how recycled rubber and waste plastics can modify the softening point and penetration of asphalt traditionally used for highways. It is shown that the modified asphalt can meet the performance index requirements when the components are present with a certain proportion or relative ratio (1:3.5). The dispersion process of the masterbatch in base asphalt can effectively be implemented, with good results and a smaller mixing time. The proposed approach may be regarded as a good strategy to achieve energy savings and protection of the environment. More >

  • Open Access

    ARTICLE

    Mechanical and Rheological Properties of Bamboo Pulp Fiber Reinforced High Density Polyethylene Composites: Influence of Nano CaCO3 Treatment and Manufacturing Process with Different Pressure Ratings

    Cuicui Wang1, Xin Wei1, Lee M. Smith2, Ge Wang1, Shuangbao Zhang3, Haitao Cheng1,*

    Journal of Renewable Materials, Vol.10, No.7, pp. 1829-1844, 2022, DOI:10.32604/jrm.2022.018782

    Abstract In order to investigate the effect of the relative motion of nano CaCO3 reinforced bamboo pulp fiber (BPF)/HDPE composite components on the mechanical performance, a comparative study was performed. BPF was treated by nano CaCO3 blending (BM) and impregnation modification (IM) technology. The composites were produced using hot press (HPMP), extrusion (EMP) and injection molding process (IMP). The physical morphology of BPF was similar at different manufacturing processes. Compared to the samples manufactured by HPMP, a decrease in the (specific) flexural strength of BPF/HDPE composites and an increase in those of composites treated by nano CaCO3 manufactured by EMP and… More >

  • Open Access

    ARTICLE

    Assessment of the Application of Subcooled Fluid Boiling to Diesel Engines for Heat Transfer Enhancement

    Xiaoyu Hu, Yi Wang, Siyuan Li, Qiang Sun, Shuzhan Bai, Guoxiang Li*, Ke Sun*

    FDMP-Fluid Dynamics & Materials Processing, Vol.17, No.6, pp. 1049-1066, 2021, DOI:10.32604/fdmp.2021.016763

    Abstract The increasing demand of cooling in internal combustion engines (ICE) due to engine downsizing may require a shift in the heat removal method from the traditional single phase liquid convection to the application of new technologies based on subcooled fluid boiling. Accordingly, in the present study, experiments based on subcooled flow boiling of 50/50 by volume mixture of ethylene glycol and water coolant (EG/W) in a rectangular channel heated by a cast iron block are presented. Different degrees of subcooling, velocity and pressure conditions are examined. Comparison of three empirical reference models shows that noticeable deviations occur especially when low… More >

  • Open Access

    ARTICLE

    Life Cycle Assessment of Recycling High-Density Polyethylene Plastic Waste

    Neeti Gandhi1,3, Nicholas Farfaras2, Nien-Hwa Linda Wang3, Wan-Ting Chen2,*

    Journal of Renewable Materials, Vol.9, No.8, pp. 1463-1483, 2021, DOI:10.32604/jrm.2021.015529

    Abstract Increasing production and use of various novel plastics products, a low recycling rate, and lack of effective recycling/disposal methods have resulted in an exponential growth in plastic waste accumulation in landfills and in the environment. To better understand the effects of plastic waste, Life Cycle Analysis (LCA) was done to compare the effects of various production and disposal methods. LCA shows the specific effects of the cradle-to-grave or cradle-to-cradle scenarios for landfill, incineration, and mechanical recycling. The analysis clearly indicates that increasing recycling of plastics can significantly save energy and eliminate harmful emissions of various carcinogens and GHGs into the… More >

  • Open Access

    ARTICLE

    Effect of Poly-Alkylene-Glycol Quenchant on the Distortion, Hardness, and Microstructure of 65Mn Steel

    Thi Xuan Tran1, Xuan Phuong Nguyen2, Duong Nam Nguyen3, Dinh Toai Vu1, Minh Quang Chau4, Osamah Ibrahim Khalaf5, Anh Tuan Hoang6,*

    CMC-Computers, Materials & Continua, Vol.67, No.3, pp. 3249-3264, 2021, DOI:10.32604/cmc.2021.015411

    Abstract Currently, the 65Mn steel is quenched mainly by oil media. Even though the lower cooling rate of oil compared to water reduces the hardness of steel post quenching, the deforming and cracking of parts are often minimized. On the other hand, the oil media also has the disadvantage of being flammable, creating smoke that adversely affects the media. The poly alkylene glycol (PAG) polymer quenchant is commonly used for quenching a variety of steels based on its advantages such as non-flammability and flexible cooling rate subjected to varying concentration and stirring speed. This article examines the effect of PAG polymer… More >

  • Open Access

    ARTICLE

    Synthesis and Characterization of Thermoplastic Poly(Ester Amide)s Elastomer (TPEaE) Obtained from Recycled PET

    Zhi-Yu Yang, Yi-Ling Chou, Hao-Chun Yang, Chin-Wen Chen*, Syang-Peng Rwei*

    Journal of Renewable Materials, Vol.9, No.5, pp. 867-880, 2021, DOI:10.32604/jrm.2021.014476

    Abstract A series of thermoplastic polyester elastomer (TPEE) and thermoplastic poly(ester amide)s elastomer (TPEaE) copolymers were obtained by depolymerizing PET (polyethylene terephthalate) by which the waste PET can be efficiently recovered and recycled into value-added products from a practical and economical point of view. The structure of TPEE and TPEaE was identified using nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FT-IR). Differential scanning calorimetry (DSC) data showed that the melting temperature (Tm) decreased with the amide content increased. The glass transition temperature (Tg) was increased as introducing the amide group, and the formation of amide-ester and amide-amide hydrogen bonds… More >

  • Open Access

    ARTICLE

    Two polymorphisms in methylenetetrahydrofolate reductase gene (C677T and A1298C) frequently associated with recurrent spontaneous abortion show no association in Saudi women

    AFRAH ALKHURIJI1, ATEKAH ABDULLAH MOHAMMED ALRAQIBAH1, AMAAL AWAD ALHARBI1, ZENEB BABAY2, FATIMAH BASIL AL-MUKAYNIZI3, ARWA ALTHOMALI3, SONYA S. ABDEL-RAZEQ4, ARJUMAND S. WARSY5

    BIOCELL, Vol.44, No.4, pp. 613-621, 2020, DOI:10.32604/biocell.2020.09652

    Abstract Methylenetetrahydrofolate reductase (MTHFR) deficiency is the most common genetic cause of hyperhomocysteinemia, which has been implicated in the etiology of recurrent spontaneous abortion (RSA). This study was designed to investigate the association between two single nucleotide polymorphisms (SNP) (rs1801133 [C677T] and rs1801131 [A1298C]) in the MTHFR gene and RSA, in Saudis. These two SNPs were selected as these polymorphisms have a different effect on the activity and stability of the enzyme, and significantly diverse effects have been reported in relation to the association with RSA. Ethical approval was acquired from the IRB at King Saud University (KKUH), Saudi Arabia, and… More >

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