Showing papers by "Deli Wu published in 2016"
TL;DR: Copper-iron bimetallic oxides have shown great potential for powerful radical production by activating peroxides and CuFeO2 rhombohedral crystals were synthesized and used as heterogeneous catalysts for peroxymonosulfate (PMS) activation under various conditions.
Abstract: Copper–iron bimetallic oxides have shown great potential for powerful radical production by activating peroxides. In this work, CuFeO2 rhombohedral crystals (RCs) were synthesized and used as heterogeneous catalysts for peroxymonosulfate (PMS) activation under various conditions. Sulfadiazine, a widely used veterinary sulfonamide, was used as a target pollutant to evaluate the efficiency of this combination. The results showed that of all the catalysts tested, the CuFeO2 RCs had the greatest reactivity. Under conditions of 0.1 g L–1 CuFeO2 RCs and 33.0 μM PMS, the nearly complete degradation of sulfadiazine occurred within 24 min. A synergistic catalytic effect was found between solid Cu(I) and Fe(III), probably due to the accelerated reduction of Fe(III). The two activation stages that produced different radicals (hydroxyl radicals followed by sulfate radicals) existed when solid Cu(I) was used as the catalyst. The CuFeO2 RCs had a higher PMS utilization efficiency than CuFe2O4, probably because the Cu(I...
530 citations
TL;DR: Novel iron-copper-carbon aerogel was fabricated through a one-step process from metal-resin precursors and then activated with CO2 and N2 in environmentally friendly way and exhibited higher mineralization efficiency than homogeneous EF technology.
Abstract: Novel iron–copper–carbon (FeCuC) aerogel was fabricated through a one-step process from metal-resin precursors and then activated with CO2 and N2 in environmentally friendly way. The activated FeCuC aerogel was applied in a heterogeneous electro-Fenton (EF) process and exhibited higher mineralization efficiency than homogeneous EF technology. High total organic carbon (TOC) removal of organic pollutants with activated FeCuC aerogel was achieved at a wide range of pH values (3–9). The chemical oxygen demand (COD) of real dyeing wastewater was below China’s discharge standard after 30 min of treatment, and the specific energy consumption was low (9.2 kW·h·kg–1COD–1), corresponding to a power consumption of only ∼0.34 kW·h per ton of wastewater. The enhanced mineralization efficiency of FeCuC aerogel was mostly attributable to ultradispersed metallic Fe–Cu nanoparticles embedded in 3D carbon matrix and the CO2–N2 treatment. The CO2 activation enhanced the accessibility of the aerogel’s pores, and the seconda...
191 citations
TL;DR: In this article, the influence of a biodegradable agent, N,N-bis(carboxymethyl)glutamic acid (GLDA), on chloramphenicol (CAP) degradation in pyrite/H2O2 system was investigated.
69 citations
TL;DR: In this article, red mud powders were used as catalysts for persulfate activation with sulfadiazine as the target contaminant, and the performance of red mud powder/persulfate system was evaluated under various experimental conditions.
66 citations
TL;DR: This study is among the first ones to identify the indispensible role of reductive decomplexation in chelated copper sequestration and suggest Fe(II) may provide a potential alternative in chelation metals pollution controlling.
32 citations
TL;DR: In this article, structural Fe(II) hydroxide (SFH) was used to remove As(III) and As(V) from aerated synthetic wastewater with initially 30mg/L As at neutral pH values.
31 citations
TL;DR: In this paper, the content of Cr(VI) sequestrated ([Cr(VI)] se ) was in proportional to the absolute content of structural Fe(II) (Fe(II).
31 citations
Journal Article•
TL;DR: In this paper, structural Fe(II) hydroxide (SFH) was used to remove As(III) and As(V) from aerated synthetic wastewater with initially 30mg/L As at neutral pH values.
28 citations
TL;DR: It was found that both PyC and Ce-PyC could exert quite stable catalytic activity in a wide pH range from 3 to 10, which was supposed to be combined with inherently comprised various metal oxide, such as Fe2O3, Fe3O4, MnO2 and CuO.
22 citations
TL;DR: The novel iron metal matrix composite synthesized by mechanically introducing quartz sand into an iron matrix (denoted as SiO2-Fe MMC) retained relatively stable activity and achieved 71% removal efficiency for 2-CP after six consecutive cycles, but the decrease in dechlorination efficiency can be attributed to the rapid consumption of Fe(0).
16 citations
Patent•
11 May 2016
TL;DR: In this paper, a preparation method and application of an iron-sulfur heterogeneous Fenton-like catalyst is described, which consists of adding a dispersing agent into a ferrous solution, and performing uniform stirring; sequentially and slowly pouring solutions of hydrosulfide and sulfide into the solution, keeping the pH of the solution to be 5.0 to 5.5.
Abstract: The invention relates to a preparation method and application of an iron-sulfur heterogeneous Fenton-like catalyst. The preparation method comprises the following steps of adding a dispersing agent into a ferrous solution, and performing uniform stirring; sequentially and slowly pouring solutions of hydrosulfide and sulfide into the solution, keeping the pH of the solution to be 5.0 to 5.5, and performing stirring for 10 to 20min; slowly adding a solution of sulfite into the solution, keeping the pH value to be 5.0 to 5.5, and performing stirring for 5 to 10min to obtain precursor sol; transferring the precursor sol into a sealed glass bottle, and performing constant temperature (25 DEG C) aging reaction in dark to obtain black precipitates, i.e. the final catalyst. The pH of wastewater is regulated to 7.0 to 11.0, a mixed solution of hydrogen peroxide/persulfate and the synthesized heterogeneous fenton-like catalyst are added into the wastewater, and stirring reaction is performed for 10 to 120min to finish the degrading of organic pollutants in the wastewater. A preparation process of the prepared iron-sulfur heterogeneous Fenton-like catalyst is simple, conditions are mild, and when being used, the prepared iron-sulfur heterogeneous Fenton-like catalyst is large in applicable pH range, and has a good deep treatment effect on industrial wastewater.
TL;DR: In this paper, a modification of granular activated carbon (GAC) by Fe-Mn-O was proposed to improve the catalytic activity of GAC for the enhanced mineralization of aqueous RB5.
Abstract: A modification of granular activated carbon (GAC) by Fe–Mn–O was proposed to improve the catalytic activity of GAC for the enhanced mineralization of aqueous RB5. The efficiency, kinetics, and possible mechanism of ozonation of aqueous RB5 catalyzed by GAC and mGAC have been investigated. mGAC exerted enhanced catalytic activity in the mineralization of aqueous RB5 and a slight promotion in decoloration. An additional 18% TOC removal efficiency was observed in the degradation of RB5 by O3/mGAC compared with O3/GAC under identical experimental conditions within 1 h. The pH exerted an evident impact on the degradation of RB5, with maximal mineralization achieved at pH 7. mGAC showed stable catalytic activity in the ozonation of aqueous RB5. Reaction kinetics showed that the TOC removal rate constant of RB5 degradation by O3/mGAC was 5.4 times higher than that by O3 alone. The reaction mechanism involved the enhanced mineralization of aqueous RB5 at the catalyst–solution interface via hydroxyl radica...
TL;DR: In this article, a possible mechanism for aqueous Ni2+ release from solid products was revealed, and the reaction started with adsorption and precipitation of Ni2+, followed by reduction of Ni 2 and substitution of Fe 2 with the formation of Ni(II)/Fe(III) layered double hydroxides.
Abstract: Aqueous Ni2+ removal by structural Fe(II) hydroxides (SFH) under well-controlled experimental conditions was investigated in this study, and a possible mechanism for Ni2+ release from solid products was revealed. Experiments with SFH and Ni2+ showed the excellent reactivity of SFH towards aqueous Ni2+ when the molar ratio of [Fe(II)]/[OH−] was below 1 : 2. The reaction started with adsorption and precipitation of Ni2+, followed by reduction of Ni(II) and substitution of Fe(II) with the formation of Ni(II)/Fe(III) layered double hydroxides. However, at long reaction time, Ni(II) release from Ni(OH)2 and NixFe(1−x)(OH)2 precipitates was observed due to the delivery of dissolved Fe2+ and Fe3+, which were determined to substitute Ni(II) by forming Fe(OH)2, Fe(OH)3 and FeIII(1+2x/3)FeII(1−x)(OH)5. The presence of O2 and NO3− reduced the removal efficiency of Ni2+ and promoted its release by consuming Fe(II) and promoting Fe3+ delivery. However, CO32− and PO43− might enhance the removal of Ni2+ and inhibit its release. For wastewater containing a high Ni2+ concentration, using SFH is also beneficial to Ni2+ recycling, as removed Ni(II) could be released and enriched, followed by future utilization.