摘要
以稻壳为原料,制备了稻壳生物炭,并运用FTIR、XRD等进行表征,详细研究了稻壳生物炭/过硫酸盐体系对水中四环素的去除效果和机制,并对四环素降解过程进行了动力学分析。结果表明,制备的稻壳生物炭对过硫酸盐具有良好的活化性能,能协同过硫酸盐实现四环素的高效去除。稻壳生物炭/过硫酸盐体系对四环素的去除率显著高于单一生物炭、过硫酸盐体系和活性炭/过硫酸盐体系。稻壳生物炭/过硫酸盐体系降解100 mL浓度10 mg/L四环素的最佳工艺条件为:生物炭投加量3 g/L,过硫酸盐投加量12 mmol/L,反应温度60℃,初始溶液pH为5.5,反应时间为120 min。该条件下,四环素的去除率达93.9%。FTIR证实,制备的稻壳生物炭表面富含羟基、羧基等含氧官能团,可活化过硫酸盐产生更多硫酸根自由基。此外,水中共存阴离子对降解过程存在不同程度的抑制作用。动力学分析表明,四环素降解过程符合一级反应动力学模型;自由基猝灭实验证实,反应体系主导自由基为硫酸根自由基。
Biochar(BC)was prepared from rice husk and characterized by means of FTIR and XRD technologies.The removal effect and mechanism of tetracycline by biochar-persulfate(BC/PS)system were studied in detail and the kinetics of the degradation was also investigated further.The results indicated that the prepared biochar exhibits good activation performance and synergy effects to persulfate(PS),which can effectively remove tetracycline in water.The removal of tetracycline by BC/PS is significantly higher than that of single BC,PS and C/PS systems.The optimum degradation conditions of tetracycline by BC/PS in concentration of 10 mg/L in 100 mL solution were found to be at the reaction temperature of 60℃,the reaction time of 120 min,initial solution pH with value of 5.5,biochar dosage of 3 g/L and persulfate dosage of 12 mmol/L.The removal rate of tetracycline could reach 93.9%under the optimum degradation conditions.The prepared biochar-based rice husk was confirmed to be rich in surface hydroxyl,carboxyl groups,and other oxygen-containing functional groups via FTIR characterizing,which could activate persulfate to make more sulfate radicals.In addition,the research has demonstrated that several anions that coexisted in water exhibit different degrees of inhibition to the degradation.Kinetic analysis indicated that the degradation was well described by the first-order kinetic model and the free radical quenching experiment confirmed that the dominant free radicals in the reaction process are sulfate radicals generated by persulfate ions.
作者
杨威
王国相
陈俊楠
郭全
YANG Wei;WANG Guo-xiang;CHEN Jun-nan;GUO Quan(School of Food Engineering,Harbin University of Commerce,Harbin 150028,China)
出处
《应用化工》
CAS
CSCD
北大核心
2024年第2期341-345,共5页
Applied Chemical Industry
基金
黑龙江省自然科学基金项目(E200818)
哈尔滨工业大学城市水资源与水环境国家重点实验室开放基金项目(ES201918)。
关键词
生物炭
过硫酸盐
四环素
稻壳
反应机制
biochar
persulfate
tetracycline
rice husk
reaction mechanism
