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Summary: In this study, the RHDAC electrode was used for the electrosorption of hexavalent chromium and fluoride (HCAF) by capacitive deionization. Different multicomponent isotherm (MCI) models were applied to simulate the simultaneous removal of HCAF using the RHDAC electrode. The results showed that the MCIM3 (Extended Langmuir) and MCIM5 (Non modified Redlich Peterson) models fitted the experimental data better with lower MPSD for HCAF. The RHDAC electrode was effective for the sorption of HCAF from low concentrated feed.
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(2023)
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Hu Kang et al.
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Dan Yang et al.
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Dan Yang et al.
Summary: CAL and CAL-PPy were prepared to efficiently remove high concentrations of Cr(VI) wastewater, with CAL-PPy showing improved adsorption performance due to increased specific surface area. The mechanisms involved electrostatic attraction, surface complexation, anion exchange, and reduction to low-toxicity Cr(III).
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Summary: This study presents a facile and effective approach to prepare Co and Co3O4 nanoparticles co-incorporating nitrogen-doped carbon nanotubes (Co-Co3O4/N-CNTs) as a novel and efficient CDI electrode. The encapsulation of Co-Co3O4 nanoparticles in CNTs inhibits Co leaching and enhances the desalination capacity. The optimized Co-Co3O4/N-CNTs electrode exhibits outstanding desalination capacity of 66.91 mg NaCl g(-1) at 1.4 V.
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Summary: The effective-designed three-dimensional Mxene-based composite PPy-NiCo-LDH@Mxene shows significant specific capacitance, superior charging and discharging property, and enhanced electrochemical cyclic stability for CDI applications. Additionally, it displays superb adsorption selectivity for Ca2+ and Mg2+ ions over Na+ ions in multi-salt solutions, indicating its potential for hard water softening processes.
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Wangwang Ji et al.
Summary: In this study, a BiOCl/PPy-Cl hybrid film with core-shell nanosheet structure was successfully fabricated for selective extraction of chloride ions with superior conductivity and high adsorption capacity. The hybrid film displayed prominent selectivity and stable adsorption performance towards Cl- due to the outer PPy-Cl shell. The excellent Cl- uptake performance was attributed to the open interlayer structure of BiOCl and the collaboratively-driven force generated by the reversible electrochemical redox of BiOCl and PPy.
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Shuang Liu et al.
Summary: In this study, a pseudocapacitive electrode with a large surface area was synthesized using an electrostatic attraction strategy, which consisted of W18O49 nanoflowers and Ti3C2Tx MXene nanosheets. This composite exhibited good electrochemical activity and prevention of restacking, resulting in a high specific capacitance, superior rate capability, and good cycle stability as a pseudocapacitive electrode. A quasi-solid-state asymmetric supercapacitor (ASC) was fabricated using this electrode and an activated carbon cathode coupled with a redox electrolyte of FeBr3, displaying high voltage, energy density, and power density.
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Yanqing Cong et al.
Summary: This study proposed a new sulfite/iodide/UV process for efficient removal of toxic hexavalent chromium (Cr(VI)) under alkaline conditions. The process accelerated the removal kinetics of Cr(VI) and showed effectiveness in real surface water and industrial wastewater.
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Xiaolu Liu et al.
Summary: Seawater contains uranium at a concentration of approximately 3.3 ppb, making it a valuable and sustainable nuclear fuel source. This study developed an adsorption-electrocatalytic platform for extracting uranium from seawater using atomically dispersed indium anchored on hollow nitrogen-doped carbon capsules functionalized with flexible amidoxime moieties. The platform showed excellent uranyl capture properties and high selectivity for uranium extraction over vanadium in seawater. X-ray absorption spectroscopy and in situ Raman results provided detailed insights into the molecular mechanism of uranium extraction. This work contributes to the growing suite of technologies for harvesting valuable metals from the earth's oceans.
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Engineering, Environmental
Caifeng Xia et al.
Summary: In this study, a novel composite material LDH@CNT was prepared using an in-situ method, which had a favorable adsorbent structure due to the mutual support of LDHs and CNTs. The adsorption kinetics of LDHs, CNTs, and LDH@CNT composites for tetracycline were well described by intraparticle diffusion and pseudo-second-order models, indicating that the adsorption site played a major role. The Generalized Langmuir model was found to better describe the adsorption process than the Langmuir model, suggesting multiple interactions between tetracycline and the composite material. Site energy distribution theory combined with molecular simulation explained the adsorption mechanisms, and the removal of tetracycline by LDHs, CNTs, and LDH@CNT composites was calculated. The results showed that LDH@CNT composites had lower average site energies compared to LDHs and CNTs, but had more exposed adsorption active sites, leading to improved removal efficiency of tetracycline.
CHEMICAL ENGINEERING JOURNAL
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Ling Yao et al.
Summary: A catalyst-free strategy for aqueous Cr(VI) extraction is developed, achieving efficient extraction and recovery of chromium resources through the formation of a polyhydroxy Cr(V) complex.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
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Ziyi Zhou et al.
Summary: This study evaluates the capability of iron-modified biochar (FeBC) in removing hexavalent chromium (Cr(VI)) and explores the reaction mechanisms. The results show that a bilayer column with FeBC and limestone layers performs the best in Cr(VI) removal with low cost. The corrosion of FeBC is related to pH and Cr(VI) concentration, and the leached Fe is attenuated and reutilized in the FeBC column. Cr(VI) is reduced to Cr(III) and adsorbed or precipitated on the biochar.
JOURNAL OF HAZARDOUS MATERIALS
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Luwei Miao et al.
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Xun-rui Wang et al.
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Li Xiang et al.
Summary: The study successfully fabricated PPy/MoS2 composites as efficient sorbents for Cr(VI) removal, showing superior adsorption capacity and cyclic stability. The sorption of Cr(VI) was significantly influenced by pH, with optimal removal efficiency achieved under acidic conditions; the adsorption process was mainly controlled by pseudo-second-order kinetics and Langmuir isotherm model; ion exchange, chemical reduction, and surface chelation played crucial roles in the elimination of Cr(VI).
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Summary: N-doped hydrochar (NHC) was successfully synthesized by one-pot hydrothermal carbonization (HTC) of NH4Cl and bamboo, showing higher adsorption capacity and reduction ability for Cr(VI) than undoped hydrochar (HC), making it a cheap and efficient adsorbent for removing aqueous Cr(VI).
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