Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 52 8 2020 10 22 Removal of Nickel and Cadmium using Diatomite, Silt, Sunflower stem, and Cement (Green Concrete Components) Removal of Nickel and Cadmium using Diatomite, Silt, Sunflower stem, and Cement (Green Concrete Components) 1953 1970 3421 10.22060/ceej.2019.15746.6018 FA Somayeh Bakhtiari department of civil engineering, sirjan university of technology Fatemeh Sotoodeh Nia departement of civil engineering, sirjan university of technology Meysam Shahrashoub department of civil engineering, sirjan university of technology 0000-0001-5934-8245 Hakimeh Abbslou sirjan university of technology Tayebeh Amiri sirjan university of technology Journal Article 2019 02 02 Adsorption is one of the common treatment applied in heavy metal removal. Recently, studies of low-cost adsorbents, which usually are waste products from industrial, agricultural and food productions and are produced abundantly, gained intensively attention to the scientist.. Since most of the structures, ponds, and drainage pipelines are made of concrete, the use of adsorbent concrete can be an effective way to remove pollutants, especially heavy metals from wastewater. In this research, diatomite and sunflower stems were used as concrete additives to adsorb cadmium and nickel from wastewater as well as materials that could maintain and even increase the strength, durability, and stability of concrete in water and wastewater structures. Diatomite was replaced with part of the cement and sunflower replaced with part of aggregates used in concrete. The adsorption of nickel and cadmium by concrete components (cement, silt, diatomite and sunflower stem) was investigated. Cement was able to remove nickel and cadmium completely. Other components of the concrete also had a good ability to remove nickel and cadmium. The maximum adsorption capacities of Ni and Cd for diatomite, silt, and sunflower stem were 2.85, 1.88, 2.61, 2.82, 18.45, and 6.82 mgr/gr, respectively. Metal adsorption onto adsorbents was evaluated by Langmuir and Freundlich isotherms. Results indicate that both Langmuir and Freundlich isotherm models are suitable. Concrete pieces removed cadmium completely, but in nickel adsorption, the control sample had the best performance. Adsorption is one of the common treatment applied in heavy metal removal. Recently, studies of low-cost adsorbents, which usually are waste products from industrial, agricultural and food productions and are produced abundantly, gained intensively attention to the scientist.. Since most of the structures, ponds, and drainage pipelines are made of concrete, the use of adsorbent concrete can be an effective way to remove pollutants, especially heavy metals from wastewater. In this research, diatomite and sunflower stems were used as concrete additives to adsorb cadmium and nickel from wastewater as well as materials that could maintain and even increase the strength, durability, and stability of concrete in water and wastewater structures. Diatomite was replaced with part of the cement and sunflower replaced with part of aggregates used in concrete. The adsorption of nickel and cadmium by concrete components (cement, silt, diatomite and sunflower stem) was investigated. Cement was able to remove nickel and cadmium completely. Other components of the concrete also had a good ability to remove nickel and cadmium. The maximum adsorption capacities of Ni and Cd for diatomite, silt, and sunflower stem were 2.85, 1.88, 2.61, 2.82, 18.45, and 6.82 mgr/gr, respectively. Metal adsorption onto adsorbents was evaluated by Langmuir and Freundlich isotherms. Results indicate that both Langmuir and Freundlich isotherm models are suitable. Concrete pieces removed cadmium completely, but in nickel adsorption, the control sample had the best performance. https://ceej.aut.ac.ir/article_3421_e846fb8a4f365ca8e84393d4f34e1b07.pdf