Preparation of Ni Al hydrotalcite/clay/activated carbon and its adsorption of antibiotics in aqueous solution.

Nickel aluminum hydrotalcite/clay/activated carbon (LDH/BE/AC) composites were prepared by urea hydrolysis from spent bleaching earth (SBE) to adsorb and remove Chlorotetracycline (CTC), Tetracycline (TC) and Ciprofloxacin (CIP) in aqueous solution. The adsorption method has the advantages of low cost, high efficiency, no secondary pollution and simple and easy operation. A series of performance tests were carried out on the composites. The results show that when the dosage of clay/activated carbon (BE/AC) is 0.2 g, the distribution of LDH/BE/AC on BE/AC is relatively uniform, which is conducive to the adsorption of pollutants. Compared with BE/AC, because the synthesis of LDH/BE/AC occupies the pores on the surface and inside of BE/AC, the specific surface area and pore volume of LDH/BE/AC composites are reduced. But at the same time, the adsorption sites of BE/AC are increased and the adsorption capacity is enhanced. The optimum adsorption capacities of the composites for CTC, TC and CIP are 160.4 mg/g, 122.3 mg/g and 91.3 mg/g respectively, and have good cycle stability. This paper provides an idea for industrial sewage treatment, that is treating waste with waste. [ABSTRACT FROM AUTHOR]