Photodegradation of propranolol in surface waters: An important role of carbonate radical and enhancing toxicity phenomenon

Guo, Yuchen; Guo, Zhongyu; Yoshimura, Chihiro; Ye, Zimi; Yu, Pengfei; Yao, Qian; Hatano, Yuta; Wang, Jieqiong; Niu, Junfeng

doi:10.1016/j.chemosphere.2022.134106

Cited by 8 publications

(2 citation statements)

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“…However, besides the pH effect, it was found that the NOM between (6-18) kDa exhibited higher impacts on the adsorption at neutral and high pHs, as the influence of NOM between (6-18) kDa and (18-60) kDa became more evident at pH 3 (the adsorbed concentration was dropped by 66% and 86%, respectively). Using an equation of R min = (3V/4) 1/3 (where R min and V represent the size in nm and MW in Da, respectively) for the NOM size prediction [41], the size ranges of NOM between (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) kDa and (18-60) kDa were (1.2-1.7) and (1.7-2.6) nm, respectively. Our BET analysis indicated that ~90% of the pore sizes of GO-Fe 3 O 4 -2.5 ranged from 1 to 7 nm (Figure 3A).…”

Section: Selective Adsorption By Pore Size Tuning: Isothermmentioning

confidence: 99%

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The Influences of Pore Blockage by Natural Organic Matter and Pore Dimension Tuning on Pharmaceutical Adsorption onto GO-Fe3O4

Lin

Huang

et al. 2023

Nanomaterials

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The ubiquitous presence of pharmaceutical pollution in the environment and its adverse impacts on public health and aquatic ecosystems have recently attracted increasing attention. Graphene oxide coated with magnetite (GO-Fe3O4) is effective at removing pharmaceuticals in water by adsorption. However, the myriad compositions in real water are known to adversely impact the adsorption performance. One objective of this study was to investigate the influence of pore blockage by natural organic matter (NOM) with different sizes on pharmaceutical adsorption onto GO-Fe3O4. Meanwhile, the feasibility of pore dimension tuning of GO-Fe3O4 for selective adsorption of pharmaceuticals with different structural characteristics was explored. It was shown in the batch experiments that the adsorbed pharmaceutical concentrations onto GO-Fe3O4 were significantly affected (dropped by 2–86%) by NOM that had size ranges similar to the pore dimensions of GO-Fe3O4, as the impact was enhanced when the adsorption occurred at acidic pHs (e.g., pH 3). Specific surface areas, zeta potentials, pore volumes, and pore-size distributions of GO-Fe3O4 were influenced by the Fe content forming different-sized Fe3O4 between GO layers. Low Fe contents in GO-Fe3O4 increased the formation of nano-sized pores (2.0–12.5 nm) that were efficient in the adsorption of pharmaceuticals with low molecular weights (e.g., 129 kDa) or planar structures via size discrimination or inter-planar π-π interaction, respectively. As excess larger-sized pores (e.g., >50 nm) were formed on the surface of GO-Fe3O4 due to higher Fe contents, pharmaceuticals with larger molecular weights (e.g., 296 kDa) or those removed by electrostatic attraction between the adsorbate and adsorbent dominated on the GO-Fe3O4 surface. Given these observations, the surface characteristics of GO-Fe3O4 were alterable to selectively remove different pharmaceuticals in water by adsorption, and the critical factors determining the adsorption performance were discussed. These findings provide useful views on the feasibility of treating pharmaceutical wastewater, recycling valuable pharmaceuticals, or removing those with risks to public health and ecosystems.

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Section: Selective Adsorption By Pore Size Tuning: Isothermmentioning

confidence: 99%

“…Over 80% of the intake dose can be excreted from the human body after metabolism [ 15 ]. As a result, PRO is frequently detected in rivers [ 16 , 17 ] and estuaries [ 18 ] in concentrations of up to 142 ng/L.…”

Section: Introductionmentioning

confidence: 99%