scholarly journals Humic Acid Promotes the Adsorption of Lead onto PSMPs: Site Energy Distribution Theory and Fluorescence Quenching Analysis

2021 ◽  
Author(s):  
Xiaotian Lu ◽  
Feng Zeng ◽  
Shuyin Wei ◽  
Rui Gao ◽  
Abliz Abdurahman ◽  
...  
Keyword(s):  
Fluorescence Quenching ◽  
Energy Distribution ◽  
Adsorption Capacity ◽  
Distribution Analysis ◽  
Metal Pollutants ◽  
Toxicological Effects ◽  
Adsorption Sites ◽  
Site Energy ◽  
Quenching Analysis ◽  
Heavy Metal Pollutants

Abstract Microplastics (MPs) have a great potential to adsorb heavy metal pollutants such as Pb2+ and the dissolved organic matter(DOM) in the aquatic environment will affect this adsorption behavior. In this study, batch experiments were performed to investigate the adsorption characteristics of Pb2+ onto polystyrene microplastics (PSMPs) in the presence and absence of HA(a kind of representative DOM). The adsorption kinetics of Pb2+ onto PSMPs conformed to the pseudo-second order model, and the adsorption isotherms were well fitted by the Langmuir model. With the increase of HA concentration, the Pb2+ adsorption onto PSMPs increased. Site energy distribution analysis showed that the presence of HA increased the adsorption site energy of PSMPs, thus enhancing the adsorption capacity for Pb2+. The fluorescence quenching analysis of HA further indicated that part of HA were adsorbed onto PSMPs, which increased additional binding sites on the surface of PSMPs. This was attributed to the abundant functional groups that could react with Pb2+ of HA. The pH and ionic strength of solution changed the structure of HA and the adsorption sites of PSMPs, which influenced the adsorption capacity of PSMPs for Pb2+. This study illustrated the effect of HA on the process and mechanism of Pb2+ adsorption onto PSMPs, and provided more information for the evaluation of environmental behavior and toxicological effects of microplastics in aquatic environments.

Adsorption of levofloxacin onto mechanochemistry treated zeolite: Modeling and site energy distribution analysis

2019 ◽  
Vol 222 ◽  
pp. 30-34 ◽  
Author(s):  
Zhen Chen ◽  
Wei Ma ◽  
Guang Lu ◽  
Fanqing Meng ◽  
Shibo Duan ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Distribution Analysis ◽  
Site Energy

Site-energy distribution analysis of humic acids adsorption by zeolitic tuff

2007 ◽  
Vol 14 (3) ◽  
pp. 363-368 ◽  
Author(s):  
S. Capasso ◽  
S. Salvestrini ◽  
E. Coppola ◽  
A. Buondonno ◽  
C. Colella
Keyword(s):  
Energy Distribution ◽  
Humic Acids ◽  
Distribution Analysis ◽  
Zeolitic Tuff ◽  
Site Energy

scholarly journals Transgenerational Effects of Hexavalent Chromium on Marine Medaka (Oryzias melastigma) Reveal Complex Transgenerational Adaptation in Offspring

Biomolecules ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 138
Author(s):  
Xiaomin Ni ◽  
Yingjia Shen
Keyword(s):  
Hexavalent Chromium ◽  
Physiological Adaptation ◽  
Human Beings ◽  
Transgenerational Effects ◽  
Marine Medaka ◽  
Metal Pollutants ◽  
Toxicological Effects ◽  
Oryzias Melastigma ◽  
Living Organisms ◽  
Heavy Metal Pollutants

Hexavalent chromium [Cr(VI)] pollution is one of most serious heavy metal pollutants in the coastal area and posed serious threats to marine organisms and human beings. Many studies have been conducted on its toxicological effects on living organisms from morphological to physiological aspects. However, there are few studies about the transgenerational toxicological of Cr(VI). In this study, we exposed adult marine medaka fishes with Cr(VI) and their offspring with Cr(VI) to examine transgenerational effects of Cr(VI). We found that there were mechanisms such as changing reproduction modes in males to compensate for impacts on the reproduction. There were differences and similarities between the parental effect and the environmental effect, with the former one causing more serious adverse effects on the offspring of Cr(VI)-exposed fish. It was noteworthy that there was an interaction between the parental and offspring treatment which leads to the attenuation of the parental effects on offspring when the offspring also underwent the same treatment. In addition, physiological adaptation has also been observed in fish to improve their fitness. Overall, effects of Cr(VI) on fish and their offspring were studied to pave a way to study the of mechanisms of adaptation.

scholarly journals Utilization of Chicken Feather Biomass As Metal Zinc Adsorbent (Zn2+)

2019 ◽  
Vol 10 (2) ◽  
pp. 11
Author(s):  
Djama’an Noer Hidayat ◽  
Maming Maming ◽  
Syarifuddin Liong
Keyword(s):  
Heavy Metal ◽  
Environmental Pollution ◽  
Atomic Absorption ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Chicken Feather ◽  
Isothermal Model ◽  
Metal Pollutants ◽  
Chicken Feathers ◽  
Heavy Metal Pollutants

Chicken feather is a waste that can be used as an alternative to adsorbents that can be used to overcome environmental pollution in waters containing heavy metal pollutants, especially on metal Zn (II) ions, Biomass Chicken Feathers using NaOH and Na2SO3 as adsorbent activation and proven using FTIR spectrophotometer . The metal adsorbent of Zn (II) ion by chicken feather biomass has been influenced to the variation of pH of the solution, mass of adsorbent, contact time, and concentration of chicken feather biomass. The method used is the method of "batch" and the metal concentration of Zn (II) ions measured by an atomic absorption spectrophotometer (AAS). Optimal variations that have been achieved under conditions of pH 6, adsorbent mass 0.7 gram, contact time for 80 minutes, and optimal concentration at 100 ppm with absorption of Zn (II) metal on chicken feather biomass of 6.04 mg/g. The metal adsorbent Zn (II) using chicken feather biomass is more in line with the Langmuir isothermal model with an adsorption capacity (Qo) value of 6.45 mg/g.

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