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  • Open Access


    Treatment of Agate Dyeing Wastewater Using an Immobilized Gel Mixture with Nano-Fe3O4 Sulfate-Reducing Bacteria

    Xuying Guo1,*, Guoliang Jiang2, Saiou Fu3, Zhiyong Hu3, Junzhen Di2, Yanrong Dong2, Ying Li4

    Journal of Renewable Materials, Vol.9, No.11, pp. 2015-2032, 2021, DOI:10.32604/jrm.2021.015878

    Abstract To solve the problems of high Cr6+, Cr3+, SO42– and H+ concentrations, pollution and processing costs associated with agate dyeing industrial drainage, we prepared an immobilized gel mixture for the treatment of such drainage on the basis of microbial immobilization technology. The immobilized gel mixture was composed of sulfate-reducing bacteria (SRB), corn cob, and nano-Fe3O4 (nFe3O4). We used a single-factor experiment to determine the optimal dose of each matrix component. We analyzed the mechanism underlying the treatment of agate dyeing wastewater with an immobilized gel mixture by X-ray diffraction and scanning electron microscopy detection. The results of the… More >

  • Open Access


    Comparison of Dilute Organic Acid Pretreatment and a Comprehensive Exploration of Citric Acid Pretreatment on Corn Cob

    Hui Qiao1, Jingzhao Cui1, Shuiping Ouyang1, Jinjie Shi2, Jia Ouyang1,3,*

    Journal of Renewable Materials, Vol.7, No.11, pp. 1197-1207, 2019, DOI:10.32604/jrm.2019.07735

    Abstract As an important agricultural waste, corn cob is one of the most abundant lignocellulosic biomass. In this work, dilute acid pretreatment using seven different organic acids were compared for compositional analysis of corn cob. The first pKa of organic acids, influenced by the number and type of the side group and distance between two carboxylic groups, played a crucial role in the pretreatment effect. Citric acid was found to have better pretreatment performance than other tested dicarboxylic acids. Under the condition of 30 mM, 160°C and 60 min, the level of xylose reached 22.64 g/L More >

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