Accelerated removal of sulfadiazine by heterogeneous electro-Fenton system with Pt-FeO/graphene single-atom alloy cathodes.

Heterogeneous electro-Fenton (EF) process is emerging as an attractive treatment technology for removal of sulfadiazine (SDZ), in which in situ generation of HO and Fe(II) are crucial steps. In this study, Pt-FeO/G was synthesized as a heterogeneous EF catalyst by incorporating Pt single atoms into a FeO nanocrystal. The optimized Pt-FeO/G cathode exhibited an SDZ conversion of >90% within 30 min over a broad pH range (3-11).

Magnetic nitrogen-doped activated carbon improved biohydrogen production.

Low biological hydrogen (bioH) production due to non-optimal metabolic pathways occurs frequently. In this work, magnetic nitrogen-doped activated carbon (MNAC) was prepared and added into the inoculated sludge with glucose as substrate to enhance hydrogen (H) yield by mesophilic dark fermentation (DF). The highest H yield appeared in 400 mg/L AC (252.

Nickel-Cobalt Oxide Nanoparticle-Induced Biohydrogen Production.

The positive effects of metal oxide nanoparticles (NPs) on dark fermentation (DF) for biohydrogen synthesis have been increased, and the mechanism still needs to be further revealed. In this study, nickel-cobalt oxide (NiCoO) NPs were prepared to increase H yield via DF. The highest (259.

Novel 2D photocatalyst of copper-doped carbon quantum dot CD(Cu) loaded with ultrathin Ni-MOL for degradation of tetracycline.

Broadening the light absorption range and suppressing the carrier complexation are the two keys to enhance the photocatalytic activity. In this work, a novel two-dimensional (2D) photocatalyst was successfully prepared by modified hydrothermal method and applied in tetracycline (TC) degradation. The degradation rate of CD(Cu)-Ni-MOL for TC reached 93.

Improved biohydrogen evolution through calcium ferrite nanoparticles assisted dark fermentation.

Dark fermentation (DF) is a green hydrogen (H) production process, but it is far below the theoretical H yield. In this study, calcium ferrite nanoparticles (CaFeO NPs) were produced to augment H yield via DF. The highest H yield of 250.

A mechanistic study on electro-Fenton system cooperating with phangerochate chrysosporium to degrade lignin.

The combined catalytic system of Electro-Fenton (E-Fenton) and () was constructed in liquid medium with additional potential to overcome the limitations of lignin degradation by white rot fungi alone. To further understand the mechanism of synergistic catalysis, we optimized the optimum potential for lignin catalysis by and built synergistic separate catalyses. After 48 h of incubation, the optimum growth environment and the highest lignin degradation rate (43.

Methane production from wheat straw pretreated with CaO/cellulase.

There are various lignocellulosic biomass pretreatments that act as attractive strategies to improve anaerobic digestion for methane (CH) generation. This study proposes an effective technique to obtain more CH the hydrothermal coupled calcium peroxide (CaO) co-cellulase pretreatment of lignocellulosic biomass. The total organic carbon in the hydrolysate of samples treated with 6% CaO and 15 mg enzyme per g-cellulose was 7330 mg L, which represented an increase of 92.

Effects of granular activated carbon and Fe-modified granular activated carbon on anammox process start-up.

In this study, granular activated carbon (GAC) and Fe-modified granular activated carbon (FeGAC) prepared by ultrasonic impregnation method were added into respective up-flow anaerobic sludge blanket (UASB) reactors to explore their effects on the anammox process start-up. The results showed that the time of anammox system start-up could be reduced from 108 d in R1 (control group) to 94 d in R2 (GAC reactor) and to 83 d in R3 (FeGAC reactor). After 120 days of operation, the nitrogen removal rates (NRR) of all reactors could reach more than 0.

Hydroxyapatite Fabrication for Enhancing Biohydrogen Production from Glucose Dark Fermentation.

Hydroxyapatite (HA) had the effect of maintaining the pH balance of the reaction system and promoting enzyme activity. In this work, hydroxyapatite was synthesized by coprecipitation and characterized for biohydrogen (bioH) production from glucose. The highest bioH yield obtained was 182.

Unraveling the roles of lanthanum-iron oxide nanoparticles in biohydrogen production.

Low hydrogen (H) yield via dark fermentation often occurs, being mainly due to H generation pathway shift. In this study, lanthanum-iron oxide nanoparticles (LaFeO NPs) were prepared to investigate their effects on bioH production. The highest H yield of 289.

Metagenomics uncovers the effect of nitrogen-doped graphene on anammox consortia and microbial function.

The effect of 50 mg/L nitrogen-doped graphene (N-G) on anammox microbial guild was studied by metagenomics in this paper. The continuous experiment results showed the average NRE improved by 17.57% with N-G addition.

Comparison of cobalt ferrate-based nanoparticles for promoting biomethane evolution from lactic acid anaerobic digestion.

Some inhibition of biomethane (bioCH) production system can be observed, which is due to the propionic acid generation from lactic acid degradation. In this work, the three cobalt ferrate-based nanoparticles (NPs) such as CoFeO, CoAlFeO and CoCuFeO were synthesized to promote the bioCH evolution from lactic acid. The CH yields from the CoAlFeO, CoCuFeO and CoFeO groups at 300 mg/L of NPs were 431.

Ammonia Fiber Expansion Combined with White Rot Fungi to Treat Lignocellulose for Cultivation of Mushrooms.

In order to improve the degradation efficiency of lignocellulose while increasing the yield of mushrooms, white rot fungi treatment (, and ) combined with ammonia fiber expansion was proposed as a method for treating lignocellulose (, salix chips, and pine chips) for mushroom cultivation. Compared with treatment using either ammonia fiber expansion or white rot fungus, the combined treatment significantly improved lignocellulose degradation rate by 10-20% and reduced the time required significantly. Among them, was the most effective bacterium for the combined treatment of lignocellulose.

Ni-MOL/InSe heterostructure construction with mixed metal (Ti/Ni) for efficient photocatalytic tetracycline degradation.

To investigate the mechanism of bimetallic 2-dimension (2D) catalyst existing in the current photocatalytic degradation process, the tetracycline (TC) degradation performance and mechanism by bimetallic 2D photocatalyst was studied extensively. Nickel metal-organic layer (Ni-MOL) and InSe, a typical 2D semiconductor photocatalyst, shows great potential for photocatalytic degradation of TC. Herein, an InSe assisted Ni-MOL composite bimetallic photocatalyst was assembled, of which could obtain the degradation rate of 96.

Comparison of copper and aluminum doped cobalt ferrate nanoparticles for improving biohydrogen production.

Two various materials, copper and aluminum doped cobalt ferrite nanoparticles (NPs) were fabricated for investigating their effects of addition amounts on hydrogen (H) synthesis and process stability. CoCuFeONPs enhanced H production more than CoAlFeO NPs under same condition. The highest H yield of 212.

Nickel Foam Promotes Syntrophic Metabolism of Propionate and Butyrate in Anaerobic Digestion.

Enhanced interspecies electron transfer (IET) among symbiotic microorganisms is an effective method to increase the rate of methane (CH) production in anaerobic digestion. Direct interspecies electron transfer (DIET), which does not involve dissolved redox media, is considered an alternative and superior method to enhance methane production by interspecific hydrogen (H) transfer (IHT). In this study, nickel foam was built into a semicontinuous anaerobic reactor to investigate its effect on the metabolism of propionate and butyrate.

Comparison of mesophilic and thermophilic dark fermentation with nickel ferrite nanoparticles supplementation for biohydrogen production.

In this work, nickel ferrite nanoparticles (NiFeO NPs) was prepared to improve hydrogen (H) production by dark fermentation. Moderate amounts (50-200 mg/L) promoted H generation, while excess NiFeO NPs (over 400 mg/L) lowered H productivity. The highest H yields of 222 and 130 mL/g glucose were obtained in the 100 mg/L (37 °C) and 200 mg/L NiFeO NPs (55 °C) groups, respectively, and the values were 38.

Highly sensitive and selective detection of PCB 77 using an aptamer-catalytic hairpin assembly in an aquatic environment.

Polychlorinated biphenyls (PCBs) are synthetic organic compounds that are extremely difficult to break down in water and can accumulate in human fat and organisms. However, methods that can be used to detect large amounts of PCBs remain unsatisfactory, as they are generally overly sensitive and involve complex operations. An aptamer-based catalytic hairpin assembly (aptamer-CHA) reaction for the selective detection of 3,3',4,4'-tetrachlorobiphenyl (PCB 77) was developed.

Selective adsorption behavior of Cd imprinted acrylamide-crosslinked-poly(alginic acid) magnetic polymers: fabrication, characterization, adsorption performance and mechanism.

Poly(acrylamide) grafted and glutaraldehyde-crosslinked alginic acid nano-magnetic adsorbent (AAMA) was prepared by selecting Cd as a template ion. Scanning electron microscope (SEM), thermo-gravimetric analyzer (TGA), vibrating sample magnetometer (VSM) and infrared spectroscopy (IR) were used to characterize the morphology and structure of AAMA. The adsorption of AAMA for different metal ions was compared and the impact of various factors for adsorption of Cd was systematically investigated.

Facile Fabrication of Calcium-Doped Carbon for Efficient Phosphorus Adsorption.

High phosphorus concentrations mainly result in environmental problems such as agricultural pollution and eutrophication, which have great negative influence on many natural water bodies. In this work, calcium lignosulfonate was employed to produce calcium-doped char at 400 and 800 °C. To compare the phosphorus adsorption behaviors of the two carbon materials, batch adsorption experiments were conducted in a phosphorus microenvironment.

Advanced bioH and bioCH production with cobalt-doped magnetic carbon.

In this work, a novel cobalt-doped magnetic carbon (CDMC) was prepared to boost hydrogen (H) and methane (CH) generation. A one-pot approach was employed to produce H and CH with an incompletely heat-treated mixed culture. A moderate amount of CDMC promoted biogas evolution, while excess CDMC eroded both H and CH productivity.

Comparison of Calcium Oxide and Calcium Peroxide Pretreatments of Wheat Straw for Improving Biohydrogen Production.

Wheat straw was pretreated with either CaO or CaO to improve biohydrogen production. Both CaO and CaO pretreatments improved the biodegradability of the wheat straw. CaO pretreatment raised the H yield by between 48.

Effect of sulfate removal in a high sulfate volumetric loading micro-aerobic bio-reactor and study of subsequent bio-sulfur adsorption by iron-modified activated carbon.

Removal of sulfide from a micro-aerobic bio-reactor was studied at 10 000 mg L chemical oxygen demand (COD) of inlet water, with the sulfate volumetric loading 0.75, 1.0, 1.

The Synergistic Action of Electro-Fenton and White-Rot Fungi in the Degradation of Lignin.

White-rot fungus is a common lignin-degrading fungus. However, compared with those of microorganisms that biodegrade lignin alone, synergistic systems of electro-Fenton processes and white-rot fungi are superior because of their high efficiency, mild conditions, and environmental friendliness. To investigate the details of lignin degradation by a synergistic system comprising electro-Fenton processes and white-rot fungi, lignin degradation was studied at different voltages with three lignin-degrading fungi (, , and ).