Table 1.
Chemical composition of biochars derived from rice straw.
Fig 1.
Fourier transform infrared (FTIR) spectroscopic analysis of biochars derived from rice straw.
Table 2.
Pore structure of biochars derived from rice straw.
Fig 2.
Sorption isotherms for tetracycline on biochars.
The adsorption temperatures were (A) 15°C, (B) 25°C and (C) 35°C.
Table 3.
Langmuir and Freundlich model parameters for tetracycline sorption on biochars derived from rice straw at different adsorption temperatures (T).
Table 4.
Pearson’s linear correlation coefficients between biochar characteristics and the qe values obtained at different initial tetracycline concentration(C0) at 25°C (n = 9).
Fig 3.
Removal efficiency of tetracycline by biochars.
The adsorption temperatures were (A) 15°C, (B) 25°C and (C) 35°C. The initial tetracycline concentration changed from 0.5 mg/L to 32 mg/L.
Fig 4.
Effect of temperature on sorption coefficient (Kd) for tetracycline sorption on biochars with different initial tetracycline concentration.
Table 5.
Thermodynamic parameters for tetracycline sorption on biochars with initial concentration of tetracycline changing from 0.5 mg/L to 32 mg/L.
Fig 5.
Effect of pH on adsorption capacity for tetracycline sorption on biochars.
The concentration of tetracycline solution was 32 mg/L. Values are triplicate means ± SD. Letters indicate significant differences among treatments at a level of p < 0.05(Tukey test).