改性木屑生物炭对阿莫西林的吸附条件分析

Condition Optimization of Amoxicillin Adsorption on the Modified Sawdust Biochar

利用高温裂解方法制备磷酸(H_(3)PO_(4))改性生物炭(PSBC_(550)),采用响应面法优化改性生物炭(PSBC_(550))对水中阿莫西林(AMX)的吸附条件,通过Box-Behnken Design探究AMX初始浓度、吸附时间、吸附温度等因素对AMX去除效率的影响。试验结果表明三个因素对PSBC_(550)去除AMX的影响大小依次为:AMX初始浓度>温度>吸附时间;PSBC_(550)吸附水中AMX的最佳工艺条件为:AMX初始浓度100 mg/L、温度45℃和吸附时间111.6 min,PSBC_(550)对AMX的吸附去除率高达99.8%。该吸附过程更符合准二级动力学模型,吸附过程主要为物理表面吸附与化学吸附。结论将对实际抗生素废水处理的工艺技术提供一定的理论参考价值。

Biochar(PSBC_(550)) was prepared by sawdust and phosphoric acid(H_(3)PO_(4)) at 550 ℃ to remove amoxicillin(AMX) from an aqueous solution. Response surface methodology(RSM) was used to investigate the adsorption conditions of AMX onto PSBC_(550). Specifically, the effect of the initial concentration of AMX, contact time and temperature was optimized based on Box-Behnken Design of RSM. Re-sults show that the greatest effect of AMX removal were ranked in the order of the initial concentration of AMX, temperature and contact time. The most optimal conditions of AMX adsorption onto PSBC_(550)(up to 99.8%) was occurred at 45 ℃ and the initial AMX concentration of 100 mg/L after 111.6 min. Furthermore, the pseudo-second-order kinetic model could fit the adsorption well, suggesting the adsorption of AMX onto PSBC_(550)was mainly controlled by the physical surface adsorption and chemical adsorption. Hence, above results may provide theoretical guidance for the treatment technology of antibiotics in contaminated waters.