Adsorption effect on Cu2+in water treated by sodium-modified sludge biochar combined with attapulgite
Copper containing wastewater is a serious threat to human health and environmental safety.Sodium-modified sludge biochar combined with attapulgite with Cu2+adsorption performance was prepared from waste sludge and attapulgite,and was used to treat Cu2+containing wastewater.The structure and surface properties of the material were analyzed and characterized using SEM,XRD,and FT-IR.The complexation of oxygen-con-taining functional groups or the Ⅱ electronic interaction of the presence of C=C bonds on the surface of the composite material is the main mechanism for adsorbing heavy metals.The adsorption effect and mechanism of composite materials on Cu2+have been studied,and the effects of composite ratio,solution pH,material addi-tion amount and initial concentration of Cu2+on the adsorption performance of the materials were investigated.The adsorption kinetics and adsorption isotherm and related subjects of the adsorption process were discussed,and the optimal adsorption conditions were predicted by response surface analysis.The results showed that when the mass ratio of sludge to attapulgite was 2∶1,pH was 5,the addition amount was 1.5 g/L,and the ini-tial concentration of Cu2+was 4 mg/L,the maximum adsorption capacity of the material for Cu2+was 3.339 mg/g.The adsorption process followed the quasi second order kinetic model and Langmuir adsorption isotherm equation,indicating that the adsorption of Cu2+by the material was a single molecular layer chemical adsorp-tion.Response surface analysis predicted a pH of 5.04,the addition amount of adsorbent of 1.16 g/L,and the initial concentration of Cu2+at 3.60 mg/L is the optimal adsorption condition.Sodium-modified sludge biochar combined with attapulgite is a highly potential adsorbent in the treatment of copper containing wastewater in practice.
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