Removal of some divalent heavy meta

Removal of some divalent heavy metal ions (Cu2+, Zn2+, Pb2+, Cd2+, Co2+) from aqueous solutions using carbon nanotube (CNT) sheets was performed. CNT sheets were synthesized by chemical vapor deposition of cyclohexanol and ferrocene in nitrogen atmosphere at 750 °C, and oxidized with concentrated nitric acid at room temperature and then employed as adsorbent for water treatment. Langmuir and Freundlich isotherms were used to describe the adsorption behavior of heavy metal ions by oxidized CNT sheets. The obtained results demonstrated that the oxidized CNT sheets can be used as an effective adsorbent for heavy metal ions removal from water. It was found out that kinetics of adsorption varies with initial concentration of heavy metal ions. Preference of adsorption onto the oxidized CNT sheets can be ordered as Pb2+ > Cd2+ > Co2+ > Zn2+ > Cu2+. Using the oxidized CNT sheets, waste water treatment without CNT leakage into water is economically feasible. Therefore, CNT sheets have good potential application in environmental protection.

ผลลัพธ์ (แอฟริกา) 1:

Verwydering van sommige divalente swaar metaalione (Cu2 +, Zn2 +, Pb2 +, CD2 +, Co2 +) van waterige oplossings met behulp van koolstof tube (CNT) velle is uitgevoer. CNT velle gesintetiseer deur chemiese dampe afsetting van cyclohexanol en ferroseen in stikstof atmosfeer by 750 ° C, en geoksideer met gekonsentreerde salpetersuur by kamertemperatuur en dan in diens as adsorbeermiddel vir water behandeling. Langmuir en Freundlich isoterme is gebruik om die adsorpsie gedrag van swaar metaal ione te kan beskryf deur geoksideer CNT velle. Die resultate wat verkry is getoon dat die geoksideerde CNT velle gebruik kan word as 'n goeie adsorbeermiddel vir swaar metaalione verwydering uit water. Daar is gevind dat kinetika van adsorpsie wissel met die aanvanklike konsentrasie van swaar metaal ione. Voorkeur adsorpsie op die geoksideerde CNT velle kan bestel as Pb2 +> CD2 +> Co2 +> Zn2 +> Cu2 +. Met behulp van die geoksideerde CNT velle, die behandeling van afvalwater sonder CNT lekkasie in die water is ekonomies haalbaar is. Daarom, CNT velle het goeie potensiaal aansoek in beskerming van die omgewing.