Valorization of algal biomass to synthesize heterogeneous gCN-Biochar photocatalyst for the treatment of industrial wastewater using photocatalysis-persulfate oxidation process.

Textile wastewater, heavily contaminated with organic dyes, is generating severe problems to environment and human health. The implementation of gCN with biochar (gCN-BC) for the treatment of textile wastewater is less effective due to the limited adsorption capacity and slower degradation kinetics. To tackle these problems, peroxydisulfate (PDS) is integrated with gCN-BC photocatalyst to enhance the process efficiency and kinetics.

Competitive inhibition of catalytic nitrate reduction over Cu-Pd-hematite by groundwater oxyanions.

The presence of various oxyanions in the groundwater could be the main challenge for the successive application of Cu-Pd-hematite bimetallic catalyst to aqueous NO reduction due to the inhibition of its catalytic reactivity and alteration of product selectivity. The batch experiments showed that the reduction kinetics of NO was strongly suppressed by ClO, PO, BrO and SO at low concentrations (>5 mg/L) and HCO, CO, SO and Cl at high concentrations (20-500 mg/L). The presence of anions significantly changing the end-product selectivities influenced high N selectivity.

Stability of Sn-Pd-Kaolinite catalyst during heat treatment and nitrate reduction in continuous flow reaction.

In this study, a novel and highly reactive Sn-Pd catalyst supported by environmentally benign kaolinite (Sn-Pd-kaolinite) was developed and evaluated for stability for effective nitrate (NO) reduction in batch and continuous mode. Complete NO removal with fast reduction kinetics (k = 18.16 × 10 min) and 71% selectivity toward N were achieved by the Sn-Pd-kaolinite catalyst during batch reactions.

Strategies to enhance the stability of nanoscale zero-valent iron (NZVI) in continuous BrO reduction.

The reduction of bromate to bromide was successfully achieved by bimetallic catalysts with NZVI support in continuous-flow reactors. The stability of NZVI-supported bimetallic catalysts was enhanced by decelerating the iron corrosion and sequential rapid passivation of the iron-Cu-Pd ensembles under optimized reaction conditions. Thus >99% bromate removal can be continuously achieved for 11 h.

Effect of promoter and noble metals and suspension pH on catalytic nitrate reduction by bimetallic nanoscale Fe(0) catalysts.

Experiments were conducted to investigate the effect of experimental factors (types of promotor and noble metals, H2 injection, and suspension pH) on catalytic nitrate reduction by bimetallic catalysts supported by nanoscale zero-valent iron (NZVI). NZVI without H2 injection showed 71% of nitrate reduction in 1 h. Cu/NZVI showed the almost complete nitrate reduction (96%) in 1 h, while 67% of nitrate was reduced by Ni/NZVI.