As(V) Removal from Water Using a Novel Magnetic Particle Adsorbent Prepared with Iron-Containing Water Treatment Residuals

Abstract

Magnetic particle adsorbent (MPA) was prepared using iron-containing sludge by solvothermal process for As­(V) removal from the water solution. The magnetic property, structure features, and surface morphology of MPA were characterized by a vibrating-sample magnetometer, X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscopy, and Brunauner–Emmett–Teller analysis. Laboratory experiments were also conducted to investigate the adsorption capability and adaptability of MPA for As­(V) removal in the water. MPA mainly consisted of γ-Fe2O3, and its saturation magnetization is 16.95 emu/g. It can be simply separated from water just using a simple magnet. It was mesoporous material with rough surface morphology and large specific surface area (238.7 m2/g). The Langmuir adsorption isotherm model could better described the As­(V) adsorption behavior than the Freundlich model, which indicated that As­(V) adsorbed on the surface of MPA appeared a monolayer distribution. Maximum As­(V) adsorption capacities at 25, 35, and 45 °C were 8.694, 10.050, and 13.400 mg/g, respectively. As­(V) adsorption onto MPA was jointly controlled by intraparticle and film diffusion which was revealed by kinetic studies. There was no conspicuous influence on As­(V) adsorption in a broad range of pH from 3 to 10. Among the coexisting anions with As­(V) in water, PO4 3–, and SiO3 2– had obvious suppression on As­(V) adsorption, while HCO3 –, SO4 2–, and Cl– had negligible influence.

Characterization and Arsenic Adsorption Behaviors of Water Treatment Residuals from Waterworks for Iron and Manganese Removal

“…Compared with the three aforementioned wastes, Water Treatment Residuals (WTRs)-which are produced during the backwashing process from biofilters for iron and manganese removal in groundwater treatment plants-are the most promising, since they are not hazardous waste. At present, there are many biological iron and manganese removal water treatment plants in China, so large quantities of WTRs must be produced annually, and their treatment, disposal, and application need further research [12].…”

Role of Adsorptive Concentration in Fenton‐Like Degradation of Organic Pollutants by Biopolymeric FeOOH/Graphene Oxide Composite Catalyst: Proof of Concept

“…The leached iron concentration (from inductively coupled plasma‐optical emission spectrometry, ICP‐OES) was within the limits set by the water quality standards and regulations (0.3 mg L –1 ), suggesting the stability of this nanocomposite (Table S1, Supporting Information). [ 45 ]…”

Bio-based Substances From Compost as Reactant and Active Phase for Selective Capture of Cationic Pollutants From Waste Water

“…Among the possible techniques for wastewater treatment, the adsorption process by solid adsorbents demonstrates a high potential as one of the most efficient methods for capturing organic contaminants from wastewaters avoiding the risk of secondary pollution brought by decomposition methods. Several adsorbents, such as activated carbon (Julcour-Lebigue et al, 2012 ), silica gel (Fan et al, 2012 ), organic clay (Unuabonah et al, 2013 ), alumina (Serbezov et al, 2011 ; Tang et al, 2018 ; Sadraei, 2019 ), iron powders (Yu et al, 2013 ; Zeng et al, 2018 ), and mesoporous silica (Ko et al, 2014 ; Ye et al, 2017 ), have been successfully applied for the removal of dyes from water, but the development of handleable materials that can operate much more easily, in particular in terms of recovery and reusability, is necessary. As the open-framework nature and large pore size (2–50 nm) are the key factors for a good diffusion of the molecules inside the adsorbing materials and a consequent fast adsorption process (Alauzun et al, 2011 ; Masika and Mokaya, 2011 ), the production of massive materials possessing these features is pursued, and alumina-based monoliths perfectly fit the requirements.…”