石墨化炭黑去除水产养殖尾水中恩诺沙星残留的研究

Removal of enrofloxacin residues from aquaculture tailwater by graphitized carbon black

本研究探究并评价了石墨化炭黑(graphitized carbon black,GCB)吸附去除水产养殖环境中恩诺沙星(enrofloxacin,ENR)的能力。通过扫描电子显微镜、傅里叶变换红外光谱仪、拉曼光谱以及Zeta电位对石墨化炭黑进行表征,探讨了p H值、吸附温度(T)、恩诺沙星初始质量浓度(C0)、吸附时间(t)对石墨化炭黑吸附恩诺沙星的影响。同时,从吸附热力学和吸附动力学等方面探究了石墨化炭黑对恩诺沙星的吸附机制。结果表明,石墨化炭黑对恩诺沙星具有良好的吸附能力,吸附过程符合伪二级动力学模型和弗罗因德利希(Freundlich)吸附等温模型。在p H=7、C0=200 mg/L、T=35℃的条件下,石墨化炭黑对溶液中恩诺沙星的吸附能力最强,最大吸附量可达74.43 mg/g。此外,石墨化炭黑对实际加标养殖淡水和加标养殖海水中恩诺沙星残留具有较好的吸附去除能力,单位吸附量分别为(32.47±0.99)、(31.84±1.46)mg/g。综上所述,石墨化炭黑具有去除实际水产养殖尾水中恩诺沙星的应用潜力。

This study explored and evaluated the adsorption capacity of graphitized carbon black(GCB)to remove enrofloxacin(ENR)in an aquaculture environment.GCB was characterized by scanning electron microscope,Fourier transform infrared spectrometer,Raman spectrum and Zeta potential.Additionally,the effects of pH value,adsorption temperature(T),initial concentration of ENR(C0)and adsorption time(t)on the adsorption of ENR by GCB were determined.Meanwhile,the adsorption thermodynamics and adsorption kinetics of ENR by GCB were explored to reveal its adsorption mechanisms.The results showed that GCB had good adsorption performance to ENR,which can be described by the pseudo-second-order kinetic model and the Freundlich adsorption isotherm model.Under the conditions of pH=7,C0=200 mg/L and T=35℃,GCB had the strongest adsorption capacity for ENR in solution,and the maximum adsorption quantity could reach 74.43 mg/g.Furthermore,it was found that GCB demonstrated good adsorption quantity on ENR residues in actual spiked cultural freshwater and spiked cultural seawater,and the unit adsorption quantities were(32.47±0.99)mg/g and(31.84±1.46)mg/g,respectively.In conclusion,GCB has the potential to remove ENR from real aquaculture tailwater.