生物炭胶体对Pb2+的吸附特性研究
Study on the adsorption characteristics of biochar colloids for Pb2+
以脐橙皮作为生物质原料,制备了生物炭(BC)和生物炭胶体(BCC)。通过单因素批量吸附实验考察了不同实验因素对BCC吸附Pb2+的性能影响,并对其吸附前后结构进行表征以分析吸附机制。通过吸附动力学模型分析其对Pb2+的吸附特性。结果表明,各影响因素下BCC均表现出优于BC的吸附性能,其吸附符合准二级动力学方程,吸附过程以化学吸附为主导。BCC对Pb2+的吸附机制主要包括静电吸引、表面络合、离子交换和共沉淀。因此,相较于BC,BCC具有更丰富的表面活性位点及独特的胶体性质,对Pb2+表现出更优异的吸附性能,在重金属污染水体修复领域具有应用潜力。
Using navel orange peel as the biomass feedstock,biochar (BC) and biochar colloid (BCC) were prepared.The effects of various experimental factors on the Pb2+ adsorption performance of BCC were investigated through single-factor batch adsorption experiments.The structures before and after adsorption were characterized to analyze the adsorption mechanism,and the adsorption characteristics for Pb2+ were examined using adsorption kinetic models.The results indicated that under different influencing factors,BCC consistently exhibited superior adsorption performance compared to BC.The adsorption followed the pseudo-second-order kinetic model,suggesting that the process was dominated by chemisorption.The adsorption mechanisms of BCC for Pb2+ mainly included electrostatic attraction,surface complexation,ion exchange,and coprecipitation.The findings demonstrate that,compared to BC,BCC possesses more abundant surface-active sites and unique colloidal properties,leading to more excellent adsorption performance for Pb2+.This highlights its potential application in the remediation of heavy metal-contaminated water bodies.
biochar / biochar colloids / Pb2+ / adsorption
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国家自然科学基金项目(52160019)
江西省自然科学基金项目(20232ACB204013)
江西省职业早期青年科技人才培养项目(20244BCE52175)
江西理工大学高层次人才科研启动项目(jxust-17)
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