Adsorption performance and kinetics of Cr(VI) onto activated carbons derived from the waste leaves of invasive plants Rhus typhina and Amorpha fruticosa

被引:7
作者
Tuerhong, Tuerxun [1 ]
Kuerban, Zaituniguli [2 ]
Abdurahman, Maryamgul [3 ]
Xinbin, Cai [3 ]
Yimingniyazi, Amanula [4 ]
机构
[1] Xinjiang Agr Univ, Coll Resource & Environm Sci, Urumqi 830052, Xinjiang, Peoples R China
[2] Xinjiang Acad Agr Sci, Inst Food Crops, Urumqi 830091, Xinjiang, Peoples R China
[3] Xinjiang Acad Forestry, Inst Forest Ecol Sci, Urumqi 830063, Xinjiang, Peoples R China
[4] Xinjiang Agr Univ, Coll Life Sci, Urumqi 830052, Xinjiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Invasive plant; Activated carbon; Cr removal; Water pollution; HEXAVALENT CHROMIUM; HIGH-EFFICIENCY; CR VI; AQUEOUS-SOLUTIONS; COCONUT SHELL; REMOVAL; WATER; REMEDIATION; CR(III); EQUILIBRIUM;
D O I
10.1007/s11356-023-29833-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
To maximize the potential of biomass from invasive plants, waste leaves from Rhus typhina (RT) and Amorpha fruticosa (AF) were used to prepare activated carbons (ACs) for the efficient removal of chromium from wastewater. Six ACs were prepared by CO2 activation at 850 degrees C with varying flow rates (500, 1000, and 1500 mL/min) and characterized by yield, pH, N-2 adsorption isotherm, FTIR, SEM, TG, and XPS. The adsorption isotherm and kinetics for chromium removal were analyzed. The outcomes showed that the ACs had mesoporous structures with specific surface areas of 408.05-701.01 m(2)/g and pore volumes of 0.360-0.653 cm(3)/g. The pores are distributed among the agglomerated nanoparticles on the surface of the granules. The existence of two kinds of chromium compounds and two valance states, Cr(III) and Cr(VI), in spent ACs was identified by the FTIR and XPS spectra. The Cr (VI) equilibrium data and adsorption kinetics were well-fit with the Langmuir isotherm (R-2 = 0.936-0.967) and pseudo-second-order kinetic models (R-2 = 0.795-0.937). The maximum Langmuir Cr adsorption capacities of ACRT1.0 and ACAF0.5 were estimated to be 266.54 and 255.21 mg/g at pH = 2.0, respectively. Concentrations of Cr(III) and Cr(VI) in filtrates after equilibrium, combined with XPS and TGA analysis of spent ACs, illustrated that Cr(VI) was converted to the less harmful trivalent chromate Cr(III) during the adsorption processes. Cr(III) and Cr(VI) probably formed compounds with carbon and nitrogen atoms on the surfaces of ACs. ACs with abundant surface N-H groups achieved high Cr adsorption performance. The waste leaves from these invasive plants are suitable for producing cost-effective and efficient ACs for removing Cr (VI) from water by chemical adsorption.
引用
收藏
页码:106460 / 106479
页数:20
相关论文
共 21 条
  • [21] Removal of Cr(VI) from aqueous solutions via simultaneous reduction and adsorption by modified bimetallic MOF-derived carbon material Cu@MIL-53(Fe): Performance, kinetics, and mechanism
    Yuan, Donghai
    Shang, Chuyu
    Cui, Jun
    Zhang, Wenjing
    Kou, Yingying
    ENVIRONMENTAL RESEARCH, 2023, 216