稻壳生物炭-纤维素-海藻酸钠微球的油相制备及其吸附亚甲基蓝工艺研究 英文

稻壳生物炭-纤维素-海藻酸钠微球的油相制备及其吸附亚甲基蓝工艺研究英文
The Preparation of Oil-based Microcapsules of Rice Husk Biochar-Cellulose-Sodium Alginate and Their Adsorption Process for Methylene Blue
The need for efficient and environmentally friendly methods for the removal of pollutants from wastewater has become increasingly important in recent years. One such pollutant, methylene blue, is a synthetic dye commonly used in various industries, including textile, paper, and plastics. The improper disposal of methylene blue-containing effluents can lead to significant environmental and health concerns. To address this issue, researchers have explored the use of natural and sustainable materials as adsorbents for the removal of methylene blue from wastewater.
In this study, we present the preparation and characterization of oil-based microcapsules composed of rice husk biochar, cellulose, and sodium alginate, and their application for the adsorption of methylene blue. Rice husk, a byproduct of rice production, is a renewable and abundant resource that can be converted into biochar
through pyrolysis. Biochar has been extensively studied for its adsorption capabilities due to its high surface area, porous structure, and the presence of various functional groups. Cellulose, a naturally occurring polymer derived from plant materials, can be used to enhance the mechanical properties and stability of the microcapsules. Sodium alginate, a polysaccharide extracted from brown seaweed, is widely used in the encapsulation of various materials due to its biocompatibility, biodegradability, and ability to form stable hydrogels.
The preparation of the oil-based microcapsules involved a two-step process. First, the rice husk biochar, cellulose, and sodium alginate were mixed and homogenized to form a stable suspension. This suspension was then added dropwise to an oil phase, such as vegetable oil or mineral oil, under constant stirring. The interfacial reaction between the aqueous and oil phases resulted in the formation of stable oil-based microcapsules. The size, morphology, and composition of the microcapsules were characterized using various analytical techniques, such as scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD).
The adsorption performance of the oil-based microcapsules for the removal of methylene blue from aqueous solutions was evaluated through a series of batch experiments. The effects of various
parameters, including contact time, initial dye concentration, adsorbent dosage, and pH, were investigated to optimize the adsorption process. The adsorption kinetics and isotherms were analyzed using well-established models to gain insights into the underlying adsorption mechanisms.
The results of the study demonstrated the high adsorption capacity of the oil-based microcapsules for methylene blue. The biochar component provided a large surface area and porous structure, enabling efficient dye adsorption. The cellulose and sodium alginate components contributed to the stability and mechanical properties of the microcapsules, ensuring their integrity during the adsorption process. The oil-based nature of the microcapsules allowed for easy separation and recovery from the aqueous phase, making the adsorption process more efficient and environmentally friendly.
Furthermore, the regeneration and reuse of the oil-based microcapsules were investigated. The adsorbent was subjected to multiple adsorption-desorption cycles, and the results showed that the microcapsules maintained their adsorption performance with minimal loss of capacity. This finding highlights the potential for the development of a sustainable and cost-effective solution for the removal of methylene blue and other organic pollutants from wastewater.
In conclusion, the oil-based microcapsules composed of rice husk biochar, cellulose, and sodium alginate have demonstrated promising results for the adsorption of methylene blue from aqueous solutions. The unique composition and structure of the microcapsules, combined with their ease of separation and reusability, make them a viable and environmentally friendly option for wastewater treatment applications. The findings of this study contribute to the ongoing efforts in developing innovative and sustainable solutions for the removal of pollutants from the environment.。