Showing papers by "Rui Xu published in 2017"
TL;DR: A novel adsorbent for the removal of P from aqueous solution was synthesized by loading zirconium oxide and iron oxide onto activated carbon nanofiber (ACF-ZrFe) simultaneously and revealed that ligands exchange and electrostatic interactions were the dominant mechanisms for P adsorption.
258 citations
TL;DR: In this article, a review summarizes the recent development of arsenic removal in EC process including the effects of primary operating parameters, optimization of the EC performance, as well as the evaluation of EC reactor configurations.
231 citations
TL;DR: The electrostatic interaction, ligand exchange, and oxygen defects on LAH surfaces jointly facilitated PO4 adsorption but with varied contribution under different pH conditions, suggesting the combined contribution of two-component of La and Al may be an important direction for the next generation of commercial products for eutrophication mitigation.
Abstract: Lanthanum (La) bearing materials have been widely used to remove phosphorus (P) in water treatment. However, it remains a challenge to enhance phosphate (PO4) adsorption capacity and La usage efficiency. In this study, La was coprecipitated with aluminum (Al) to obtain a La/Al–hydroxide composite (LAH) for P adsorption. The maximum PO4 adsorption capacities of LAH (5.3% La) were 76.3 and 45.3 mg P g–1 at pH 4.0 and 8.5, which were 8.5 and 5.3 times higher than those of commercially available La-modified bentonite (Phoslock, 5.6% La), respectively. P K-edge X-ray absorption near edge structure analysis showed that PO4 was preferentially bonded with Al under weakly acid conditions (pH 4.0), while tended to associate with La under alkaline conditions (pH 8.5). La LIII-edge extended X-ray absorption fine structure analysis indicated that PO4 was bonded on La sites by forming inner sphere bidentate-binuclear complexes and oxygen defects exhibited on LAH surfaces, which could be active adsorption sites for PO4....
181 citations
TL;DR: It was found that varieties of enzymes and anaerobes in AR were primary reason for the enhancement of anaerobic digestion, and the effect of heavy metals in AR on sludge an aerobic digestion was dosage dependent.
132 citations
TL;DR: Deterioration of digestion process was timely indicated by the dramatic decrease of archaeal population and microbial biodiversity, and a considerable number of rare species were strongly correlated with methane production, which were frequently overlooked due to the limits of detecting resolution or analysis methods before.
56 citations
TL;DR: In this article, a hot-dipped Zn coating on the Al substrate surface prior to friction stir spot welded (FSSW) magnesium-aluminium joints was added to eliminate the cracking and Mg-Al intermetallics in the FSSW joint.
Abstract: For friction stir spot welded (FSSW) magnesium–aluminium joints, the formation of Mg–Al intermetallics in the hook region and cracking at the interface damaged seriously the strength of Mg–Al joints, resulting in lower joint load of only 0.8 ± 0.2 kN. When adding the hot-dipped Zn coating on the Al substrate surface prior to FSSW, a brazed layer, composed of Mg–Zn and Al–Zn diffusion zones at the edge of the shoulder, and a transition layer, composed of MgZn2, Zn-rich zone and residual Zn in the hook region, were formed in the FSSW Mg–Al joint, eliminating the cracking and Mg–Al intermetallics in the FSSW joint without the Zn coating. The load of the joint with the Zn coating increased to 3.7 ± 0.3 kN.
14 citations
TL;DR: In this article, the authors combined alkaline reagents and microbial flocculant GA1 (MBFGA1) to remove Ni(II) from aqueous solution.
Abstract: Generally, most biomaterials present high biosorption capacity for heavy-metal ions. In this study, alkaline reagents and microbial flocculant GA1 (MBFGA1) were combined to remove Ni(II) from aqueous solution. Response surface methodology was employed to optimize the flocculation and biosorption conditions with the Ni(II) removal rate as the response, as well as to analyze the biosorption capacity. At initial Ni(II) concentration of 100 mg L−1, the optimal conditions were predicted to be 1.3 × 10−2% (w/w) CaO, 6.59 × 10−3% (w/w) MBFGA1, and stirring time of 61.97 min, at which the Ni(II) removal rate and biosorption capacity of MBFGA1 could reach 99.35% and 225.16 mg g−1, respectively. The biosorption behavior, Fourier-transform infrared spectra, and environmental scanning electron microscopy analysis demonstrated that adsorption bridging with precipitation enmeshment was the most likely mechanism. Analysis of the mechanism and procedure indicated that synergistic flocculation and biosorption by MBFGA1 resulted in the significant Ni(II) removal.
12 citations
Patent•
25 Jan 2017
TL;DR: In this paper, a novel absorbing material for efficiently removing phosphorus out of water and belongs to the technical field of environment protection is proposed, where a lanthanum compound and an aluminium compound are selected as the raw materials, and a co-precipitation method is adopted to prepare the efficient phosphorus removing absorbent which can effectively remove different kinds of phosphorus out from the water under the action of electrostatic attraction, ligand exchange and absorbent surface oxygen vacancy.
Abstract: The invention relates to a novel absorbing material for efficiently removing phosphorus out of water and belongs to the technical field of environment protection. According to the invention, a lanthanum compound and an aluminium compound are selected as the raw materials, and a co-precipitation method is adopted to prepare the efficient phosphorus removing absorbent which can effectively remove different kinds of phosphorus out of the water under the action of electrostatic attraction, ligand exchange and absorbent surface oxygen vacancy. Compared with the existing phosphorus removing adsorbents, the novel adsorbing material is simple in preparation process, low in production cost, high in phosphorus removing efficiency, long-lasting in phosphorus fixing effect, low in ecological safety risk, wide in pH application scope, and convenient for storage, transportation and use.
3 citations
Patent•
04 Aug 2017
TL;DR: In this article, a preparation method for rare earth polyaluminum chloride water treating agent is described. But the preparation process is simple, the production time is short, the purity of the product is high, and the surface of a product has an oxygen vacancy structure, so that a fixing effect to phosphorus is lasting.
Abstract: The invention provides a preparation method of a rare earth polyaluminum chloride water treating agent, and belongs to the technical field of environmental protection. The preparation method comprises the following steps: taking aluminium chloride powder and lanthanum chloride as raw materials; preparing the raw materials into a mixed solution; controlling stirring speed of a reaction solution; controlling the adding speed and the adding amount of an alkaline solution in a fogdrop spraying mode to adjust the degree of alkalization of the product; adjusting the oxygen vacancy structure of the surface of a lanthanum compound in a preparation process; and finally carrying out spray drying to obtain a powdered preparation. The preparation process is simple, the production time is short, the purity of the product is high, and the surface of the product has an oxygen vacancy structure, so that a fixing effect to phosphorus is lasting; basicity is high; and the content of water insoluble matters is low. The product has double effects of flocculation algae removal and adsorption phosphorous removal, and has high environment benefit, economic benefit and social benefit.
1 citations