Environmental Scan and Framework of Watershed Risk Assessment in Malaysia

Alam, Lubna; Mokhtar, Mazlin; Ta, Goh Choo; Lee, Khai Ern; Latif, Mohd Talib

doi:10.1007/978-981-10-8090-6_8

Cited by 1 publication

(1 citation statement)

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“…It is well acknowledged that some metals pose a threat to the health of a variety of different forms of life. The Metals Cr, Cu, Pb, Zn, and Hg stand out as some of the most dangerous pollutants on the list of pollutants that are included in the water framework directive (Directive 2000/60/EC) [1]. Over the course of the past several years, various countries have introduced brand new regulations, tightened existing ones, and increased their level of enforcement regarding wastewater discharges.…”

Section: Introductionmentioning

confidence: 99%

Mercury Sorption onto Rice Husk Ash: An Isothermal Remodelling

Dan-Iya,

Ada,

Ubana

et al. 2023

Bioremed Sci Technol Res

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The rice milling process produces rice husk as a by-product. It is one of the most important agricultural leftovers in terms of volume. The data of the sorption isotherm of Hg (II) (CV) sorption onto rice husk ash, which was plotted using linearized plots of isothermal models were reanalyzed using isothermal models using nonlinear regression. As the datapoints were small, nineteen isotherm models with parameters of only up to three were utilized to prevent overfitting. The models were Henry, Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Jovanovic, Redlich-Peterson, Sips, Toth, Hill, Khan, BET, Vieth-Sladek, Radke-Prausnitz, Brouers–Sotolongo, Fritz-Schlunder III, Unilan, Fowler-Guggenheim and Moreau. Statistical analysis based on error function analyses such as root-mean-square error (RMSE), adjusted coefficient of determination (adjR2), accuracy factor (AF), bias factor (BF), Bayesian Information Criterion (BIC), corrected AICc (Akaike Information Criterion), and Hannan-Quinn Criterion (HQC) showed that Freundlich model was the best model. The value of the maximum monolayer adsorption capacity for Hg binding to rice husk ash according to the Langmuir’s parameter qmL was 3.998 mg g-1 (95% Confidence interval from 2.473 to 5.523), while bL (L mg-1), the Langmuir model constants was 0.067 L mg-1 (95% C.I. from 0.001 to 0.134). The Freundlich model is unable to forecast the maximal adsorption capacity. The Halsey rearrangement of the Freundlich equation gave the estimated maximum absorption of 3.39 mg g-1, which is very close to the experimental value. The nonlinear regression method provides parameter values within the 95% confidence interval, facilitating improved comparability with prior research.

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Section: Introductionmentioning

confidence: 99%