Reaction study of sugarbagasse biochar adsorption-reduction cr( ).
1. Background.
With the process of industrialization, heavy metal pollution is becoming more and more serious, and Cr( ) has attracted extensive attention due to its high toxicity, refractory degradation and bioaccumulation. The search for efficient, economical and environmentally friendly CR( ) treatment methods has become a research hotspot. As an agricultural waste, the resource utilization of bagasse not only helps to solve environmental problems, but also provides new ideas for the treatment of CR( ).
2. Purpose of the study.
The purpose of this study was to reveal the adsorption-reduction performance of bagasse biochar on Cr( ), reveal its reaction mechanism, and evaluate its potential in practical application.
3. Experimental materials and methods.
Preparation of bagasse biochar.
Sugarasse was pyrolyzed at high temperature under oxygen-limiting conditions to obtain biochar. The physicochemical properties were characterized by BET, SEM, FTIR and other means.
cr( ) adsorption-reduction experiments.
The adsorption-reduction performance of bagasse biochar on Cr( ) was studied under different pH, temperature and initial concentration. The kinetic and isothermal adsorption models were used to fit the data to reveal the adsorption mechanism.
Mechanism of reaction**.
Through XPS, FTIR and other analytical methods, the functional group changes and valence transformation in the process of adsorption-reduction of CR() in sugarbagasse biochar were used to reveal its reaction mechanism.
IV. Results and Discussion.
Physicochemical properties of bagasse biochar.
The results showed that bagasse biochar had abundant pore structure, which was conducive to the adsorption process. SEM and FTIR results showed that there were a large number of oxygen-containing functional groups on the surface of biochar, which provided active sites for the adsorption and reduction of Cr().
Adsorption-reduction properties of cr( ).
The experimental results showed that bagasse biochar had good adsorption performance for Cr( ), and the adsorption capacity gradually increased with the increase of pH and the decrease of temperature. The fitting results of kinetic and isothermal adsorption models showed that the process was in line with the quasi-second-order kinetic model and the Langmuir isothermal adsorption model, indicating that the adsorption process was dominated by chemical adsorption, and the surface of biochar was uniform.
Mechanism of reaction**. The results of XPS and FTIR analysis showed that during the adsorption-reduction process, the oxygen-containing functional groups on the surface of sugarbagasse biochar underwent redox reaction with Cr(), reducing Cr( ) to Cr() and oxidizing itself. This finding provides theoretical support for the application of bagasse biochar in Cr( ) treatment.
V. Conclusions and prospects.
This study showed that bagasse biochar had good adsorption-reduction properties for Cr(), and its abundant pore structure and oxygen-containing functional groups provided favorable conditions for the treatment of Cr(). In practical application, the treatment efficiency of Bagasse Biochar for Cr( ) can be further improved by optimizing the preparation conditions and operating parameters. Looking forward to the future, bagasse biochar has broad application prospects in the field of heavy metal pollution control.
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