Development and optimization of a silica-bound laccase biocatalyst and its application in hospital wastewater treatment.

Laccase from Trametes hirsuta was immobilized on amino-functionalized silica by adsorption and covalent binding using glutaraldehyde (GLA) and glyoxal (GLX) as cross-linkers. The immobilization process was optimized applying the Box-Behnken methodology. The immobilized biocatalysts were characterized using scanning electron microscopy, Brunauer-Emmett-Teller surface area and Barrett-Joyner-Halenda pore size analyses, and elemental analysis.

National scale assessment of the occurrence and risk of trace organic contaminants in Canadian Lake sediments.

In Canada studies on the presence of trace organic contaminants (TrOCs) such as pharmaceuticals, personal care products, pesticides and flame retardants in lakes have primarily focused on the water column at localized scales. To address this gap, the occurrence of 44 TrOCs, representative of various types of human activities, was investigated in surface sediments (0-2 cm) from 193 lakes across Canada. A total of 28 targeted TrOCs were detected, with 99.

Method development and comprehensive study of matrix effects for the determination of trace organic contaminants in lake sediments.

The presence of trace organic contaminants (TrOCs), such as pharmaceuticals, personal care products, additives, and polar pesticides in sediments of rivers and lakes highly impacted by anthropogenic activities makes sediments a secondary source of contamination for aquatic ecosystems. Considering this, a method for analyzing 44 TrOCs of diverse nature (including five transformation products, 13 pharmaceuticals, five personal care products, 14 pesticides, and seven additives) was developed and validated. It is based on extraction by pressurized liquid extraction (PLE), followed by purification and pre-concentration by solid phase extraction (SPE) and quantification by liquid chromatography coupled to a triple quadrupole mass spectrometer (LC-QqQMS).

Influence of anthropogenic activities on the trace organic contamination of lakes.

Anthropogenic activities and urbanization can lead to the discharge of organic compounds into surface waters. It is important to investigate these relationships further to mitigate contamination better and prioritize protection efforts. This study aimed to verify the effect of specific anthropogenic factors on lake water contamination caused by trace organic contaminants (TrOCs) such as pharmaceuticals, pesticides and consumer product additives.

Important Counteranion Effect on Adsorption Efficacity of Hydrogen Sulfide by Silver(I)-Dithione Coordination Polymers.

Four new coordination polymers (CPs) have been prepared and evaluated for their efficacy in adsorbing hydrogen sulfide. The reactions of the structurally flexible assembling dithione ligand, , with different silver(I) salts lead to four new metal-organic coordination architectures (CPs , , , and ) exhibiting either one- or two-dimensional networks. CP , 2D-[(AgCl)], exhibits a linear series of rhomboid (S)Ag(μ-Cl)Ag(S) secondary building units (SBUs) where S is one of the thione functions of , altogether forming a 2D-network.