Bi2MoO6 microspheres CdS Fenton Fenton reactions History of engineering & technology LCA N, S-co-doping SBA15 Technology: general issues TiO2-SiO2 activated carbon adsorption advanced oxidation process advanced oxidation processes antibiotic antibiotic removal antimony doped tin oxide atomic layer deposition biochar carbon nanotubes carbon xerogel catalytic wet air oxidation catalytic wet peroxidation charge separation chemical vapour deposition contaminants of emerging concern electrochemical oxidation environmental catalysis environmental impact graphene