Study of the Effect of Pyrolysis Temperature on the Cd2+ Adsorption Characteristics of Biochar
Source abstract
Abstract
Rice husk and cotton straw were used to produce biochar under 300, 400, 500, 600, and 700 °C pyrolysis conditions, and the physicochemical properties of the obtained biochar samples were characterised. The effects of various adsorbent amounts, initial pH, and adsorption time on the Cd2+ adsorption performance were studied. The results showed that, at increasing pyrolysis temperatures, the biochar yield decreased, the ash content increased, the pH transitioned from acidic/neutral to basic/strongly basic, the biochar aromaticity gradually increased, and the biochar structure became more stable. In contrast, the hydrophilicity and polarity decreased, the specific surface area increased, and the number of oxygen-containing functional groups decreased. All these factors resulted in differences in the Cd2+ adsorption by the biochar samples. With increasing adsorbent content, the rate of Cd2+ adsorbed on the biochar gradually increased. The adsorption performance was optimal when the initial solution pH of the rice-husk and cotton-straw biochar samples was 5 and 6, respectively. The shortest time to achieve equilibrium was 30 min for rice-husk biochar, and 20 min for cotton-straw biochar. The Cd2+ adsorption data for both types of biochar were very well fitted with a pseudo-second-order kinetic model. Ion exchange and cation–π interactions may be the main factors influencing the Cd2+ adsorption by biochar. At the same time, the large specific surface area of biochar also plays a role in the Cd2+ adsorption.
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Research context
OpenAlex topics: Adsorption and biosorption for pollutant removal · Heavy metals in environment · Clay minerals and soil interactions
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
The Beijing Key Laboratory of New Technology in Agricultural Application, Department of Agricultural Resource and Environment, Beijing University of Agriculture, Beinong Road 7, Huilongguan, Changping District, Beijing 102206, China
Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Scieces, No.12 Zhongguancun South St., Haidian District, Beijing 100081, China
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