粉煤灰提铝残渣制备4A分子筛及Cu（Ⅱ）吸附研究

doi:10.19964/j.issn.1006-4990.2024-0096

Abstract

Abstract:

The 4A zeolite has become an excellent adsorption material for the treatment of heavy metal wastewater，due to its good cation⁃exchange ability.In order to achieve the goal of“using waste treat waste”，the geopolymer was prepared from the aluminum extraction residue by fly ash，and then the shaped 4A zeolite was synthesized by hydrothermal in⁃situ conversion.The 4A zeolite was characterized by XRD，FT-IR，SEM，BET，TGA.The effects of adsorption time，initial concentration of Cu（Ⅱ），amount of adsorbent and pH value of solution on its adsorption properties were investigated，and the adsorption process was studied by combining the kinetic equation and adsorption isotherm model.The results showed that the synthesized 4A zeolite had developed pores and more micropores.The total specific surface area was 71.85 m²/g，of which the specific surface area of micropores was 53.91 m²/g，and the micropores were mainly concentrated in about 1.3 nm.The optimal conditions for adsorption of Cu（Ⅱ） by the shaped 4A zeolite were as follows：the adsorption time was 240 min，the initial concentration of Cu（Ⅱ） was 100 mg/L，the amount of adsorbent was 2.0 g/L，and pH was 6~9，the adsorption capacity could achieve 32.97 mg/g，and the removal efficiency of Cu（Ⅱ） was 65.93%.The adsorption process conformed to the pseudo⁃second order kinetic model，which was mainly chemisorption.Langmuir model had better fitting effect，indicating that the adsorption process of Cu（Ⅱ） on synthetic 4A zeolite was monolayer absorption，and the maximum adsorption capacity of Cu（Ⅱ） obtained by fitting was 37.05 mg/g.

Key words: aluminum extraction residue by fly ash, shaped 4A zeolite, Cu（Ⅱ）^adsorption, pseudo?second order kinetics equation, Langmuir model

CLC Number:

TQ131.21

ZHAO Shiyong, XIAO Yuchen, MA Qingqing, YANG Zhenni, WANG Jizhen, FAN Xiaoping. Study on adsorption of Cu（Ⅱ） on 4A zeolite synthesized by aluminum extraction residue by fly ash[J]. Inorganic Chemicals Industry, 2024, 56(10): 127-134.

Figures/Tables 14

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Study on adsorption of Cu（Ⅱ） on 4A zeolite synthesized by aluminum extraction residue by fly ash

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