In-situ growth preparation and photocatalytic properties of BC@CdS composites
A series of biochar(BC)supported CdS composites(BC@CdS)were prepared from in-situ hydrothermal growth of biomass gasification char residue and characterized by XRD,SEM,BET,XPS,UV-Vis DRS,PL,and EIS.The influence of m(BC):m(CdS)on the photocatalytic performance of BC@CdS on target pollutant levofloxacin(LVF)was analyzed,while the factors affecting BC@CdS photocatalytic degradation of LVF were investigated,and their cyclic stability and applicability to different pollutants were evaluated.The mechanism of BC@CdS photocatalytic degradation on LVF was further discussed.The results showed that CdS nanoparticles grew uniformly on the surface of BC,thus effectively preventing their own agglomeration.BC@CdS-2 prepared with m(BC)∶m(CdS)=1∶2 exhbited the best photocatalytic performance.Under visible light irradiation for 90 min,when 20 mg BC@CdS-2 were used for degradation of 50 mL LVF with a mass concentration of 20 mg/L,LVF showed a degradation rate of 90.87％,with the degradation rate maintained at 85.45％after the BC@CdS-2 was recycled for 5 times.The degradation rates of different pollutants(ciprofloxacin,ofloxacin,oxytetracycline hydrochloride,Romindane B)with a mass concentration of 20 mg/L were 83.57％～93.65％under BC@CdS-2 photocatalysis.Moreover,BC@CdS-2 displayed anti-interference ability to the pH of the system environment as well as co-existing ions.Hole and superoxide radical were the main active groups in BC@CdS photocatalytic system.
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