Removal of heavy metals from wastewater using modified agricultural adsorbents
TL;DR: The removal of heavy metal ions from wastewater using agricultural waste is based upon metal biosorption. as discussed by the authors compared removal efficiency of different adsorbents and showed that modification in these adsorbants enhance the adsorption capacity.
About: This article is published in Materials Today: Proceedings.The article was published on 2017-01-01. It has received 73 citations till now. The article focuses on the topics: Biosorption & Adsorption.
Citations
More filters
TL;DR: In this article, a review of different treatment methods for removing heavy metals from the aquatic environment with a different degree of success has been presented, and the distinctive sorts of treatment strategies for the removal of the toxic metals from wastewater had been explained.
742 citations
TL;DR: This work is an overview of membrane and filtration methods for the removal of pollutants such as bacteria, viruses and heavy metals from surface water.
114 citations
TL;DR: In this article, the use of natural banana peel for the biosorption of pollutants from water is discussed, and the factors controlling pollutants removal, and regeneration and reuse of the biosorbent.
Abstract: Pollution of environmental waters and ecosystems is increasing. Adsorption is an effective technique for water decontamination, but is limited by the cost of commercial adsorbents such as activated carbon. Research has thus focused on the recycling and transformation of biowaste as low-cost, biodegradable adsorbents. In particular, banana peel is promising for commercial use due to its wide availability and efficiency. Here, we review the use of natural banana peel for the biosorption of pollutants from water. We discuss the factors controlling pollutants removal, and the regeneration and reuse of the biosorbent. pH of 5.0 to 7.0 is favorable for the removal of cationic pollutants, while pH of 2.0 to 4.0 is suitable for anionic pollutants. Generally, higher pollutant concentration induces lower removal, whereas higher banana peel dosage induces higher removal. Banana peel exhibits efficient removal of pollutants at various temperatures, with adsorption capacities mostly within 1–100 mg/g. Nitric acid is the most efficient eluent for heavy metal desorption from banana peel. Most studies showed efficient biosorbent reuse up to five cycles and above. We also discuss the thermodynamics, kinetics and isotherms of the adsorption process.
113 citations
TL;DR: Based on the results of this study, brewed tea waste has a high potential to remove heavy metals from aqueous solutions and has an inverse relationship with pH and a linear relationship between the other parameters.
Abstract: Recently, the search for low-cost eco-friendly adsorbents has become one of the main objectives of researchers. The aim of this study was to test the removal of four heavy metals, namely lead (Pb), zinc (Zn), nickel (Ni) and cadmium (Cd), from a simulated watery solution using brewed tea waste as a potentially suitable adsorbent. The effects of pH levels (2.0-6.0), adsorbent amount (0.1-5.0 g), contact times (1-150 min.) were examined throughout the adsorption process. The results of the experiments showed that the heavy metals elimination yields had an inverse relationship with pH and a linear relationship between the other parameters. The optimum pH for the removal of the heavy metals was between 4.0 and 5.0 in the case of the brewed tea waste. Equilibrium times of 2, 10, 30 and 5 min were required for the adsorption of Pb, Zn, Ni, Cd onto Camellia sinensis, respectively. Based on the results of this study it can be said that brewed tea waste has a high potential to remove heavy metals from aqueous solutions. The maximum adsorption capacities were calculated as 1.197, 1.457, 1.163 and 2.468 mg/g, for Pb, Zn, Ni and Cd, respectively, by fitting the equilibrium data to the Langmuir isotherm model.
111 citations
TL;DR: The use of agricultural waste to remove heavy metals from wastewater has attracted much attention due to its economic advantages and high removal efficiency which is attributed to different functional groups as discussed by the authors, however, it is difficult to evaluate the performance of these materials due to their low cost, regeneration ability and high adsorption efficiency.
Abstract: The use of agricultural waste to remove heavy metals from wastewater has attracted much attention due to its economic advantages and high removal efficiency which is attributed to different functional groups. The sorption mechanism of biomass can consist of several steps including chemisorption, complexation, adsorption on surface, diffusion through pores, and ion exchange. Heavy metals were removed in different rates depending on the adsorbent and metal itself. For instance, coconut waste showed adsorption capacities of 263 and 285 mg/g in removing lead and cadmium ions, respectively. Also, black oak bark has adsorbed mercury in an adsorption capacity of 400 mg/g, while wheat brans adsorption capacity for chromium was 310 mg/g. The adsorption capacity is commonly calculated by Lagergren's first-order equation, the Redlich Peterson model, and the Brunauer–Emmett–Teller (BET) model. However, Langmuir and Freundlich models were intensively used to calculate the adsorbed amount by a unit weight of solid sorbents. This review article aims to present the recently available information on utilizing the biomass materials for heavy metals removal. Here, we highlight the increasing use of these materials due to their low cost, regeneration ability, high adsorption efficiency, and small chemical or biological sludge with a possibility of metal recovery.
109 citations
References
More filters
TL;DR: It is evident from the literature survey articles that ion-exchange, adsorption and membrane filtration are the most frequently studied for the treatment of heavy metal wastewater.
6,844 citations
TL;DR: Concerns about selenium impacts on aquatic resources in Southeastern Idaho and British Columbia and the growing discomfort among the scientific community with a waterborne criterion has lead the US Environment Protection Agency to consider a tissue-based criterion for Selenium.
761 citations
TL;DR: This mineral showed the same high sorption capacity values when used in the purification of metal electroplating waste waters, appearing, therefore, as most suitable to perform metal waste water purification processes.
482 citations
TL;DR: In this paper, a mathematical model was developed to describe the nickel ion sorption in a fixed bed column, which considered the hydrodynamics throughout the fixed-bed column as well as the sorption process in the liquid and solid phases.
235 citations
TL;DR: In this paper, the removal of cadmium ions from dilute aqueous solution by adsorption on commercial activated carbon, chitosan biosorbent and chitosa-activated carbon composite was investigated.
157 citations