Abstract
Nansi Lake is the largest and the most important freshwater lake in north China for the South-North Water Transfer Project. Due to long-time and large-scale fish farming of history, the excess fish food and excretion usually release pentavalent arsenic, which is converted into trivalent arsenic (As (III)) in the lake sediment and released into lake water. Adsorption of arsenite using six submerged plants (Mimulicalyx rosulatus,Potamogeton maackianus,Hydrilla,Watermifoil,Pteris vittata, andPotamogeton crispus) as adsorbing materials was investigated. The experimental data obtained have been analyzed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherm models and the pseudo-first-order, pseudo-second-order, and intraparticle diffusion kinetics models. According to the results, the As (III) equilibrium data agreed well with the Freundlich isotherm model. The adsorption capacity of the plants was in the following order:Potamogeton crispus>Pteris vittata>Potamogeton maackianus>Mimulicalyx rosulatus>Hydrilla>Watermifoil. The sorption system with the six submerged plants was better described by pseudo-second-order than by first-order kinetics. Moreover, the adsorption withPotamogeton crispuscould follow intraparticle diffusion (IPD) model. The initial adsorption and rate of IPD usingPotamogeton crispusandPteris vittatawere higher than those using other plants studied.
Highlights
Arsenic (As) is a naturally occurring element in the earth
The occurrence of high levels of naturally occurring arsenic in groundwater has weakened the success of supplying safe water and about 35–77 million people are at risk of being exposed in Bangladesh [4]
Due to the high toxicity and carcinogenicity of arsenic, its maximum concentration in drinking water was limited to 10 μg/L by the World Health Organization (WHO) and the Ministry of Health of the People’s Republic of China [9]
Summary
Arsenic (As) is a naturally occurring element in the earth. It is found in soils, surface, and ground waters, in the atmosphere and organisms (including the human body) [1,2,3]. The occurrence of high levels of naturally occurring arsenic in groundwater has weakened the success of supplying safe water and about 35–77 million people are at risk of being exposed in Bangladesh [4]. Due to the high toxicity and carcinogenicity of arsenic, its maximum concentration in drinking water was limited to 10 μg/L by the World Health Organization (WHO) and the Ministry of Health of the People’s Republic of China [9]. Developing economical, efficient, and reliable As removal technologies for water treatment is pressing
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