Adsorption of malachite green on groundnut shell waste based powdered activated carbon

Okorocha

et al. 2017

ILCPA

Abstract. The potential of white potato peel powder for the removal of methyl red (MR) dye from aqueous solution was investigated. The adsorbent was characterized by FTIR and SEM analysis. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were studied to observe their effects in the dye adsorption process. The optimum conditions for the adsorption of MR onto the adsorbent (WPPP) was found to be contact (80 mins), pH (2) and temperature (303 K) for an initial MR dye concentration of 50 mg/l and adsorbent dose of 1.0 g. The experimental equilibrium adsorption data of the (MR) dye fitted best and well to the Freundlich isotherm model. The maximum adsorption capacity was found to be 30.48 mg/g for the adsorption of MR. The kinetic data conforms to the pseudo-second order kinetic model.

Section: Introductionmentioning

confidence: 99%

Adsorption and Equilibrium Studies on the Removal of Methyl Red from Aqueous Solution Using White Potato Peel Powder

Okorocha

et al. 2017

ILCPA

Int. J. Environ. Sci. Technol.

“…Effluents from dyeing processes in the textile industries are known to contain color dye, heavy metals and surfactants that are stable to photo-degradation, bio-degradation and oxidizing agents (Garg et al 2004;Kannan and Sundaram 2001;Malik et al 2007). It has been a great concern to remove the synthetic dyes as they (or their degradation components) may be carcinogens and toxic that requires effective treatment system.…”

Section: Introductionmentioning

confidence: 99%

Preparation of porous carbon from date palm seeds and process optimization

Reddy

Shoaibi

Srinivasakannan

2014

The agricultural wastes like date palm seeds to be a suitable precursor for the preparation of porous carbon has been explored in the present work, utilizing phosphoric acid as the activating agent. The experimental methods reported in literature were chosen with certain modification in order to simplify the process. The process optimization was performed using the popular response surface methodology adopting a Box-Behnken design. Process optimization was performed to maximize the porous carbon Brunauer-Emmett-Teller (BET) surface area and the methylene blue (MB) adsorption capacity, with the process variables being the activation temperature, impregnation ratio (IR) and the activation time. The textural characteristics were assessed based on nitrogen adsorption isotherms, scanning electron microscopy, while the adsorption capacity was estimated using the MB adsorption. The optimized experimental conditions were identified to be an activation temperature of 500°C, IR of 3.1 and activation time of 71.4 min, with the resultant porous carbon having BET surface area of 846.7 m 2 /g and MB adsorption capacity of 445.7 mg/g. The popular Langmuir and Freundlich adsorption isotherm models were tested, and a maximum monolayer adsorption capacity of the MB was estimated to be 345 mg/g, which compares with the highest of MB reported in literature, evidencing the suitability of the porous carbon for adsorption of macro-molecular compounds.

“…Amounts of metal ions removal increased when the adsorbent dose increase from 1 to 3.5 g. The availability of large surface area due to the presence of functional groups on the adsorbent with which the metal ions interacted caused an increase in adsorption with an increase in sorbent dosage. These functional groups are important in the formation of London Vander Waals bonding since they play major roles in binding the metal ions to the adsorbents [21]. According to Aksu and Cagatay [22] who stated that lower sorbent dosages yield higher uptake but lower percentage removal efficiencies.…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

Sequestering of Ni (II) and Co (II) from Aqueous Solution Using Spines of <i>Bombax buonopozense</i> as Low-Cost Adsorbent

Mustapha¹

2017

AJCHE

Abstract:The release of potentially toxic elements either by anthropogenic or industrial activities has deteriorated water quality rendering water bodies unsuitable. It was on this basis that readily available agricultural waste was used to treat simulated wastewater containing the potentially toxic element (Ni and Co). Adsorption studies of Co and Ni from aqueous solution were performed using spines of Bombax buonopozense (raw), carbon prepared from Bombax buonopozense (AC 1 ) and activated carbon prepared from modification of spines of cotton silk tree (AC 2 ). Batch adsorption techniques were carried out as a function of contact time, pH, initial concentration, temperature, and dosage. The respective optimum contact times required for adsorption Co and Ni were 90 min. Characterizations of adsorbents were carried out which include: bulk density, hardness, electrical conductivity, ash contents, percentage moisture, and yield. Fourier transform infra-red spectroscopy (FTIR) showed that functional groups in the sorbents were responsible for the adsorption process. The adsorption isotherms data were tested for Langmuir, Temkin and Freundlich equations. The pseudo-first-order, pseudo-second-order, Elovich and diffusion (intra-particle) models were investigated on the adsorption kinetic data. This could be as a result of ion exchange involved in the sequestration of metal ions by the adsorbents. Therefore, sorption using spines of Bombax buonopozense has been adjudged as one of the best tools for replacing conventional methods for the removal of these metals because of its efficiency, costeffectiveness and the availability of the adsorbents.