Natural organic matter facilitates formation and microbial methylation of mercury selenide nanoparticles

Abstract

Tiemannite nanoparticles available for microbial mercury methylation are formed during the co-precipitation of natural organic matter, divalent mercury and selenium.

Extracellular polymeric substances enhance dissolution and microbial methylation of mercury sulfide minerals

“…2b and S7 †) both exceeded the maximum K q for diffusion-controlled quenching (2.0 × 10 10 L mol −1 s −1 ), 24,26 indicating the occurrence of a static quenching process that may involve EPS-Hg(II) inner-sphere complexation. 47,48 The Stern-Volmer quenching constants (K SV ), and binding constants (K A ) of EPS(ND132)-Hg were consistently larger than those of EPS(PCA)-Hg, suggesting a stronger binding affinity of EPS(ND132) to Hg(II) relative to EPS(PCA) (Fig. 2b and S7 †).…”

Nano-Biofertilizer Formulations for Agriculture: A Systematic Review on Recent Advances and Prospective Applications

“… Nano-Enhanced Formulations: By adding nanofertilizers to traditional fertilisers or soil amendments, their overall effectiveness may be increased and their risk of side effects can be decreased [ 180 ]. Organic matter or soil amendments: This improves the interactions of nanofertilizers with soil elements, enhancing nutrient retention and availability [ 181 ]. Targeted Delivery: Enhancing nutrient absorption and minimizing loss may be accomplished by using nanocarriers or nanoparticles that can be directed to certain plant tissues or root zones [ 182 ].…”

“…Organic matter or soil amendments: This improves the interactions of nanofertilizers with soil elements, enhancing nutrient retention and availability [ 181 ].…”

Effect of natural organic matter (NOM) on the removal efficiency of Hg(ii) by MoS2: dependence on the Hg/MoS2 ratio and NOM properties

“…NOM exhibits a strong affinity for Hg and forms Hg–NOM complexes via various functional groups present in NOM, such as thiol (–SH), carboxyl (–COOH), and amine moieties (–NH 2 ). 19,20 Such complexation could further influence the chemical speciation, transformation, and bioavailability of Hg, 21,22 The presence of NOM can have diverse effects on Hg removal processes, and previous studies have reported varying observations regarding its effects. For instance, it has been reported that NOM can compete with sorption sites for Hg complexation, leading to a decline in the adsorption capacity of nanomaterials such as FeS, 2 thiolated graphene oxide, 20 activated carbon, 23 and zero valent iron.…”