Study on Preparation of Sb(TPA)MOF@WSBC Composite and Its Adsorption and Removal of Sb(Ⅲ) AITranslate

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Chinese Library Classification Number:X703[环境科学与工程—环境工程];TQ424[化学工程];TB332[一般工业技术—材料科学与工程]

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Using walnut shell biochar(WSBC)prepared by pyrolysis as the carrier,Sb(Ⅲ)was first ad-sorbed from aqueous solution to realize resource utilization.Subsequently,Sb(TPA)MOF@WSBC compo-sites were synthesized in situ with Sb(Ⅲ)adsorbed on the WSBC surface as the metal center and tereph-thalic acid(TPA)as the organic ligand.The microstructure and surface characteristics of the materials were characterized by SEM,XRD,FT-IR,BET,XPS,etc.The effects of adsorbent dosage and wastewater pH value on Sb(Ⅲ)adsorption by three adsorbents(WSBC,Sb(TPA)MOF,Sb(TPA)MOF@WSBC)were comparatively investigated.The adsorption mechanism of the composite toward Sb(Ⅲ)was elucida-ted using adsorption kinetics,thermodynamics,and adsorption isotherm models,and its reusability was evaluated through cyclic regeneration experiments.The results show that the Sb(TPA)MOF@WSBC composite exhibits octahedral Sb(TPA)MOF particles uniformly dispersed and loaded on the WSBC surface.Compared with WSBC and Sb(TPA)MOF,the composite possesses a significantly increased specific sur-face area and pore volume,which can provide abundant adsorption active sites.With the increase of adsor-bent dosage,the adsorption capacity of Sb(Ⅲ)(calculated by unit mass of adsorption material)decreases significantly.With increasing pH value,the adsorption capacity of Sb(Ⅲ)first decreases and then increa-ses.When the initial concentration of Sb(Ⅲ)in the wastewater is 20 mg/L,pH is 8,and the solid-liquid ra-tio of adsorbent to wastewater is 0.5 g/L,the equilibrium adsorption capacity of Sb(TPA)MOF@WSBC composite for Sb(Ⅲ)is 2.9123 mg/g.The adsorption behaviors of three adsorbents all fit the Lagergren second-order kinetic model and the Langmuir adsorption isotherm model,indicating monolayer adsorption.Thermodynamic analysis demonstrates that the adsorption process is spontaneous,exothermic and accom-panied by a decrease in entropy,and lower temperatures are more favorable for the adsorption reaction.In addition,the Sb(TPA)MOF@WSBC composite exhibits excellent recycling stability,and its adsorption mechanism is dominated by hydrogen bonding,Sb(Ⅲ)-πinteraction and coordination complexation.This study provides a novel composite adsorbent for the treatment of antimony-containing wastewater.