文献类型： 外文期刊

作者： Tuerhong, Tuerxun ¹ ; Kuerban, Zaituniguli ² ; Abdurahman, Maryamgul ³ ; Xinbin, Cai ³ ; Yimingniyazi, Amanula ⁴ ;

作者机构： 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

关键词： Invasive plant; Activated carbon; Cr removal; Water pollution

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：5.8； 五年影响因子：5.4 ）

ISSN： 0944-1344

年卷期： 2023 年

页码：

收录情况： SCI

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.