Accepted Manuscript Molecular mechanism of anionic dyes adsorption on cationized
Keywords: Rice husks cellulose; Grafting; Dye adsorption; Adsorption mechanism; Non-linear fitting 1. Introduction
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| Keywords: Rice husks cellulose; Grafting; Dye adsorption; Adsorption mechanism;
Non-linear fitting 1. Introduction A growing concern for the excessive consumption of fossil resources and environmental protection has encouraged research on alternative sources of bio-based products for different industrial applications. Lignocellulosic biomass, including forestry, agricultural and agro-industrial wastes, has received extensive attention for the preparation of functional materials due to its non-toxic, biodegradable, and renewable properties [1]. In terms of total planting area and production, the four main crops grown in the world are rice, corn, wheat and sugar cane. In agricultural residues ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 3 and herbaceous plants, rice husks account for 20%-25% of dry matter rice, and rice husks are usually separated at rice processing centers [2]. Although the main part of rice husks is used as animal feed, a large amount of this biomass is still unused or burned in an open environment [3]. The direct burning of rice husks in an open environment can cause environmental pollution, which is not a good and recommendable practice for sustainable development. Therefore, rice husks should be properly utilized for the production of high value-added products. Compared to other agricultural residues, rice husks have some unique properties, such as high silica content, high porosity, light weight and very high external surface area, making them valuable materials for industrial applications [4]. Over the past two decades, researchers have focused on the use of rice husks biomass for other applications such as absorbents, coatings, pigments, cements, insulators, rubber, electronics, energy, and production of potential reinforcement for fabrication of MMCs and CMCs due to its low cost and rich supply around the world [5-7]. Dyestuffs are commonly used in dye products in the textiles, rubber, paper, plastics, and cosmetics industries. The discharge of residual dye wastewater is a serious environmental problem. Many organic dyes contain toxic substances that may affect aquatic organisms and even affect the food chain, causing damage to the ecological environment [8]. The removal of dyes is an essential task for environmental protection. Adsorption has been found to be an attractive process for removing dyes from industrial effluents. Alternative low-cost, non-conventional adsorbents such as bagasse fly ash, rice husks ash, peat, lignite, bagasse pith, wood, and sawdust have been proposed for the treatment of effluents [9, 10]. Among of them, the use of rice husks as raw materials to prepare adsorbent materials for the purification of dye wastewater is focused on silica-based activated carbons mainly utilizes its low price and richness in silica and cellulose-based activated carbon because of its high cellulose content [11]. In the previous research, the use of rice husk as sources of silica to produce silica based catalyst was used to study the adsorption and photo-degradation for methylene blue (MB) under UV irradiation by synthesized via sol–gel method [12]. Long Lin et al. have prepared mesoporous tải về 1.26 Mb. Chia sẻ với bạn bè của bạn:
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