Optimized Arsenic Adsorption Using Functionalized Mesoporous Silica: Insights into Kinetics, Thermodynamics, and pH-Dependent Behavior | Chapter 7 | Chemical and Materials Sciences: Developments and Innovations Vol. 8

This study investigates the preparation and effectiveness of functionalized mesoporous materials, amino-functionalized SBA-15 and mercapto-functionalized SBA-15, for arsenic removal, specifically targeting As(III) and As(V) species. Characterization through BET analysis revealed significant differences in surface areas and pore structures between unmodified SBA-15 and the functionalized materials. Adsorption experiments demonstrated that the Langmuir isotherm model best described the equilibrium data, with maximum adsorption capacities reaching 98.3 mg/g for M-SBA-15 with As(V) and 97.3 mg/g for A-SBA-15 with As(III). The adsorption kinetics followed a pseudo-second-order model, indicating rapid saturation of active sites at lower arsenic concentrations. Thermodynamic parameters suggested that adsorption processes were spontaneous and endothermic, with positive ΔS⁰ values indicating increased randomness at the interface. Notably, pH strongly influenced the adsorption performance, with optimal adsorption observed near neutral pH for both As(III) and As(V). These findings underscore the potential of M-SBA-15 and A-SBA-15 as promising adsorbents for arsenic removal from water. This study highlights the critical need for advanced materials to address global water contamination challenges and underscores the potential of M-SBA-15 and A-SBA-15 as highly efficient adsorbents for arsenic remediation.

 

Author (s) Details

 

Salah Ali Mahgoub Idris
Chemistry Department, Faculty of Science, University of Tobruk, Tobruk, Libya.

 

Marwa Faez Ali Mohammed
Chemistry Department, Faculty of Science, University of Tobruk, Tobruk, Libya.

 

Please see the book here:- https://doi.org/10.9734/bpi/cmsdi/v8/3559

An Effective Way of Removing Nickel (II) from Aqueous Solutions Using Powder of Mosambi Fruit Peelings as a Low Cost Sorbent | Chapter 7 | Recent Developments in Chemistry and Biochemistry Research Vol. 2

The removal of heavy metals from waste water has recently become the subject of considerable interest owing to strict legislations introduced to control water pollution. Heavy metals like Zn, Cu, Ni, and As are known to have toxic effects at very low concentrations as well as very high concentration. The aim of this study is to analyse the removal of Ni (II) from aqueous solutions. In the present investigation, the powder of Mosambi fruit peelings (PMFP) was used as an inexpensive and efficient adsorbent for Ni (II) removal from aqueous solutions. The influence of physico-chemical key parameters such as the initial metal ion concentration, pH, agitation time, particle size and adsorbent dosage has been considered in batch tests. Sorbent ability to adsorb Ni (II) ions was examined and the mechanism involved in the process investigated. The optimum results were determined at an initial metal ion concentration of 50 (mg L-1), pH=4, agitation time – 90 min, an adsorbent dose (125 mg/50 ml) and the particle size (0.6 mm). The % adsorption, Langmuir constants [Q0=29.41(mg/g) and b=0.4789(L/mg)], Freundlich constant Kf= 23.92(mg/g) and n=2.24(L/mg), Lagergren rate constants [Kad (min-1) = 4.37 x 10-2] for [Ni (II)] 50 (mg L-1), were determined for the adsorption system as a function of sorbate concentration. The equilibrium data obtained were tested using Langmuir, Freundlich adsorption isotherm models, and the kinetic data obtained were fitted to pseudo first order model. If low cost adsorbents perform well in removing heavy metals at low cost, they can be adopted and widely used in industries not only to minimize cost inefficiency, but also to improve profitability. Heavy metal removal with the above adsorbent appears to be technically feasible, eco-friendly and has high efficacy.

Author(s) Details:

R Hema Krishna,
Department of Chemistry, Vignan’s Lara Institute of Technology and Science, Vadlamudi, Andhra Pradesh-522213, India.

AVVS Swamy,
Department of Environmental Sciences, Acharya Nagarjuna University, Nagarjunanagar, Andhra Pradesh, India.

Please see the link here: https://stm.bookpi.org/RDCBR-V2/article/view/14115

Machine Learning Application, Isotherm Modelling and Adsorption Kinetics for the Removal of Chromium (VI) using Carissa Carandas| Chapter 1 | Research Aspects in Chemical and Materials Sciences Vol. 5

 The basic goal concerning this study is to scrutinize and predict the capacity of cheap bio-sorbent Carissa carandas in eliminating chromium from industrial waste water utilizing analytical methods and machine learning methods such as Radial Basis Function Neural Networks. The adsorption method has been widely used to separate ingot ions in bulk for many age, and it is well known to scientists. The adsorption capacity of Carissa carandas for the evacuation of Cr(VI) ions from local industrial wastewater was examined in this paper as an application to physical-time wastewater situation using differing analytical mechanisms such as Atomic Adsorption Spectroscopy (AAS), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X-ray dissemination (XRD). In this paper, we proposed machine learning located radial footing function neural network, that is used to model the obtained exploratory results to estimate the percentage expulsion of Cr(VI) for different obscure metal ion concentrations.The adsorption of Cr(VI) from local industrial waste water by Carissa carandas groomed by chemical system, it was treated accompanying the standard test procedures, resolved using Langmuir, Freundlich isotherms and Pseudo-first and second order energetic models. Adsorbent dose, initial adsorbate aggregation, pH, and contact time all had an affect the percentage of adsorption. According to the research's verdicts, Carissa carandas was able to adsorb hexavalent chromium to a maximum of 96% at 5 ppm, 120 record, 1 g/L of adsorbent dose, pH = 5, and 95.81% utilizing ANN for the same parameters. The Carissa carandas are widespread and freely accessible in many locales, thus the results concerning this research will be economically and effectively advantageous for the health of the sea and land environments.

Author(s) Details:

GopiKrishna Pasam,
Engineering Department, University of Technology and Applied Sciences (UTAS), Ibra, Oman.

P. Sirisha,
Department of Chemistry, St. Peter’s Institute of Higher Education and Research (Deemed to be University), Avadi, Chennai, Tamil Nadu - 600 054, India.

Sayeeda Sultana,
Department of Chemistry, St. Peter’s Institute of Higher Education and Research (Deemed to be University), Avadi, Chennai, Tamil Nadu - 600 054, India.

Please see the link here: https://stm.bookpi.org/RACMS-V5/article/view/8894

Adsorption Behavior of Acid-Leached Clays in Bleaching of Oil: A Descriptive Study | Chapter 02 | Current Topics on Chemistry and Biochemistry Vol. 1

 The goal of this work was to characterise the bleaching of oils by examining the type of adsorptive processes that occur during the bleaching of vegetable oils using clays. According to the existing evidence, acid-leached clays had sites for adsorption of contaminants in oils. The Langmuir and Freundlich isotherms for residual contaminants in cotton and sunflower-seed oils bleached with the identical clay ingredients were linear. Increases in both the temperature of thermal activation and the concentration of acid used to leach the clay resulted in a rise in the constant, k, implying that bleaching efficiency improved. The value of n decreased as the temperature of activation and the acid concentration used to leach the clay increased, indicating that the bleaching capacity of the clay increased. Clays' surface, structural, and bleaching qualities were influenced by their mineral compositions.

Author(S) Details

I. Z. Mukasa-Tebandeke
Department of Chemistry, Makerere University, Kampala, Uganda.

P. J. M. Ssebuwufu
Department of Chemistry, Makerere University, Kampala, Uganda.

S. A. Nyanzi
Department of Chemistry, Makerere University, Kampala, Uganda.

G. W. Nyakairu
Department of Chemistry, Makerere University, Kampala, Uganda.

M. Ntale
Department of Chemistry, Makerere University, Kampala, Uganda.

F. Lugolobi
Department of Earth Sciences, Wesleyan University, Middletown, USA.

Schumann Andreas
Department of Geology, Makerere University, Kampala, Uganda.

View Book:- https://stm.bookpi.org/CTCB-V1/article/view/6521