Preparation of carbon/Al 2 O 3 /nZVI magnetic nanophase materials produced from drinking water sludge for the removal of
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RESEARCH ARTICLE
Preparation of carbon/Al2O3/nZVI magnetic nanophase materials produced from drinking water sludge for the removal of As(V) from aqueous solutions Jiaran Xi 1 & Jing Feng 1 & Dan Ge 2 & Yilin Wang 2 & Xuebin Lu 1,2 Received: 11 May 2020 / Accepted: 30 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Drinking water sludge (DWS) contains organic carbon and metal ions with the potential to prepare adsorbents. In this research, DWS was separated into two parts by acid leaching, i.e., an acid leaching carbonization sludge (ALCS) and an acid leaching solution. Iron and aluminum were extracted from the acid leaching solution and loaded onto ALCS by sedimentation and liquidphase reduction to prepare a carbon/Al2O3/nZVI magnetic adsorption material (ALCS-Al-Fe). The optimum arsenic removal conditions, adsorption kinetics, and isotherm were determined, and the characteristics of the adsorbent ALCS-Al-Fe were investigated. The results showed that the composite exerted a favorable arsenic removal effect due to the electrostatic adsorption of nanometer zero-valent iron as well as ion exchange and complexation between the OH− groups on the surface of ALCS-Al-Fe and As(V). The pH change had a slight effect on the adsorption capacity, while the common anions SO42− and SiO32− showed obvious inhibitory effects. Considering that alkalinity is beneficial to arsenic ion desorption, NaOH was used in desorbing to conduct 6 cycles of regeneration experiments, and the final removal rate could still reach 90.5%. Therefore, the concept of green development of preparing magnetic adsorbents by using whole component of DWS is significant to the exploitation of sludge recycling. Keywords Drinking water sludge . Magnetic nanosized materials . Synthesis . Adsorption . Arsenic removal . Waste reutilization
Introduction As one of the byproducts of sewage treatment in water purification plants, the waterworks sludge in China has an annual yield of about 1.5 billion m3. In addition, the sludge can easily cause severe contamination of the environment or harm human health through the food chain if it is discarded in the environment (Leader et al. 2008). Thus, the initial intention of sludge treatment is to reduce the pollution of natural water Responsible Editor: Tito Roberto Cadaval Jr Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-11084-5) contains supplementary material, which is available to authorized users. * Xuebin Lu [email protected] 1
School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China
2
Department of Chemistry and Environmental Science, School of Science, Tibet University, Lhasa 850000, China
and the environmental burden. With the continuous development of the society, the commonly used methods of sludge utilization include adsorbent preparation (Devi and Saroha 2017; Kim et al. 2020; Zhang et al. 2018), building materials production (Rodrigues and Holanda 2015), and the recovery of inorga
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