Removal of Phosphate Using Red Mud: An Environmentally Hazardous Waste By-Product of Alumina Industry

Prajapati, Shivkumar Shrinarayan; Najar, P. A. Mohamed; Tangde, Vijay M.

doi:10.1155/2016/9075206

Cited by 20 publications

(8 citation statements)

References 33 publications

(45 reference statements)

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“…Besides, the results of the physical properties analysis of M-ARM materials by the BET method were described in detail in Table 1. [18]; and (iii) the work of Li et al reported that the best pH value for phosphorus adsorption by RM was 7 [19]. From the above statements, there are some differences which, in our opinion, may be due to different RM activation methods.…”

Section: Resultsmentioning

confidence: 76%

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Trung

Ning

Dan

2022

Adsorption Science & Technology

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In this paper, the mesopore-activated red mud (M-ARM) was prepared by treating red mud (RM) with acid under an ultrasonic batch and through heat treatment at 750 C. The surface area and adsorption average pore width of M-ARM were calculated and obtained values of 13.408 m2 g-1 and 25.160 nm, respectively. Therefore, the maximum adsorption capacity of M-ARM for phosphorus was 200.85 ± 1.66 mg g − 1 at 318 K and pH = 5 . At a low initial concentration (75 mg L-1), the phosphorus removal capacity by M-ARM material was up to 97.09 ± 0.15 % at 313 K. With the temperature scales varying from 298 to 313 K, the values of Gibbs free energy change ( Δ G ° ) were negative and also vary from -37.47 to -36.68. The phosphorus adsorption process in an aqueous solution is spontaneous, and this adsorption process was exothermic with enthalpy change ∆ H o = − 14.36 . From the results of investigations and calculations of thermodynamic values, kinetics, and adsorption capacity of materials, we can confirm that the materials in this study had a low-cost and potential material for applications to treat phosphorus-contaminated water. In addition, the adsorption kinetics of this material for phosphorus were also studied and discussed.

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Section: Resultsmentioning

confidence: 76%

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Trung

Ning

Dan

2022

Adsorption Science & Technology

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“…Experiment results (Figure 8) further show that chemical treatment can considerably improve the adsorption capacity of raw activated carbon [39]. It also seen that up to 50mgL -1 of initial concentration (at Ce 30) it forms monolayer shown in graph but further more increasing nickel concentration, pressure of adsorption increases due to this it starts again adsorption in porous holes.…”

Section: Adsorption Isotherms Studymentioning

confidence: 71%

Agricultural waste material Cotton Stack Activated Carbon as a suitable adsorbent for removing nickel (Ni++) ions, a heavy metal, from aqueous solutions: Synthesis, Characterization, and Isotherm Study.

Burile,

Khandeshwar

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Activated carbon (AC) produced from the cotton stack with activating zinc chloride (CSZn) in muffle fernane under nitrogen atmosphere in 600°C. The chemical activation has increased its surface area. It shows a strong capacity of adsorption for the removal of nickel from an aqueous solution due to its enhanced porous structure and higher pHpzc value. The ability was studied using a variety of variables, such as varying the pH, concentration, temp, time of contact, and dose of adsorbent, and optimal conditions were found at pH 8, 10 mgL-1,90 min, 40°C and 200mg respectively. The removal of 75% of the Ni++ ion at a starting concentration of adsorbent at 100 mg was observed. The experimental adsorption results suit the Langmuir isotherm in the isotherm investigations fairly well. The efficient and affordable generation of activated carbon utilizing cotton stack agro-waste may be the solution for the issue of disposing of agricultural trash.

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“…The XRD profiles of the fresh RM, RM-800, and RK-800 catalysts with K doping of 5% to 40% are shown in Figure a. Different crystalline phases found in the fresh RM sample were Fe 2 O 3 (at 2θ of 33.0°, 35.68°, 40.7°, 49.23°, 53.9°, 62.2°, and 64.9°), Al(OH) 3 (2θ of 18.42°), SiO 2 (2θ of 37.6°), TiO 2 (2θ of 24.4°), and NaAlO 2 (2θ of 20.7°). − As reported in our earlier study, calcination of RM at 800 °C resulted in considerable increase in the surface concentration of Fe 2 O 3 and decrease in concentration of active NaAlO 2 , which resulted in low activity of the catalyst. It can be seen from Figure a that KNO 3 remained in well-dispersed phase on the surface of the RM at a lower percentage of K loading (5% to 15%), due to which there were no distinct XRD peaks of KNO 3 observed and Fe 2 O 3 remained as a dominant phase in the RK-800 catalysts loaded up to 15% K. This could be a reason for the low activity of the catalyst at low K loading.…”

Section: Resultsmentioning

confidence: 99%

Exploring the Promotional Effects of K, Sr, and Mg on the Catalytic Stability of Red Mud for the Synthesis of Glycerol Carbonate from Renewable Glycerol

Das

Mohanty

2019

Ind. Eng. Chem. Res.

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The focus of this study was to utilize red mud (RM), an aluminum industry waste, for the preparation of various catalysts for the synthesis of glycerol carbonate (GC) from glycerol (GL). A series of catalysts were prepared by doping potassium, strontium, and magnesium on the surface of RM, and their effect on the stability of RM based catalysts was examined. From preliminary studies, K-doped RM catalysts were found to have better activity as well as stability than the Sr-and Mg-doped RM catalysts for the transesterification of GL. The RK-30%-800 catalyst prepared by 30% K loading and calcination at 800 °C produced the highest activity and stability compared to other K-doped catalysts. The better activity of the RK-30% catalyst was due to the presence of the maximum surface concentration of active K 2 O, which was confirmed from the XRD analysis. The surface concentration of K 2 O contributed significantly to the increased basic properties of the catalyst, which was quite evident from the acid−base titration, CO 2 -temperature programmed desorption (CO 2 -TPD), and Hammett indicator test. A probable mechanism of the GL transesterification process by using the RK-30%-800 catalyst was proposed. Moreover, effect of the presence of impurities on the catalytic activity, the reaction kinetics, reusability study, and deactivation mechanism were studied in detail here.

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Removal of Phosphate Using Red Mud: An Environmentally Hazardous Waste By-Product of Alumina Industry

Cited by 20 publications

References 33 publications

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Agricultural waste material Cotton Stack Activated Carbon as a suitable adsorbent for removing nickel (Ni++) ions, a heavy metal, from aqueous solutions: Synthesis, Characterization, and Isotherm Study.

Exploring the Promotional Effects of K, Sr, and Mg on the Catalytic Stability of Red Mud for the Synthesis of Glycerol Carbonate from Renewable Glycerol

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