Preparation of Manganese Dioxide Modified Scrophularia Ningpoensis Root Residue Biochar and Its Adsorption of Tetracycline
In order to solve the problem of insufficient disposal capacity of waste residue after extraction of Scrophularia ningpoensis root,manganese dioxide modified Scrophularia ningpoensis root residue biochar(Mn-BC)was prepared by high temperature sintering method combining with chemical co-precipitation method,and its adsorption result of tetracycline hydrochloride(TC)was studied.The morphology and pore structure of biochar before and after adsorption were characterized by SEM and BET,respectively.The adsorption results showed that when the modification ratio was 1:10,the solid-liquid ratio was 0.8 g/L,the initial concentration was 150 mg/L,the pH value was 5,and the adsorption time was 1 440 min at 308 K,the adsorption capacity of TC reached 162.08 mg/g.After four adsorption-desorption cycles,the adsorption efficiency of TC by Mn-BC was 85.53%.The adsorption of TC by Mn-BC conforms to the pseudo-first-order kinetic model,indicating that the adsorption process was dominated by physical adsorption.Mn-BC can successfully adsorb TC.Mn-BC has irregular porous structure,good specific surface area and porosity,indicating that Mn-BC provides a new idea as an adsorbent in the treatment of antibiotic wastewater.
chinese medicine residuescrophularia rootbiocharmanganese dioxidetetracycline hydrochloride
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