Isolation, Characterization and Application of Humin From Sumatran Peat Soils as Adsorbent for Naphtol Blue Black and Indigosol Blue Dyes

Maya Rahmayanti,Feni Larasati,Indah Nurhikmah

doi:10.20884/1.jm.2021.16.1.700

Maya Rahmayanti, Feni Larasati + Show 1 more

Open Access

https://doi.org/10.20884/1.jm.2021.16.1.700

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Journal: Molekul	Publication Date: Mar 28, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Sunan Kalijaga State Islamic University Yogyakarta

Abstract

Isolation, characterization and application of humin as adsorbent for naphtol blue black (NBB) and indigosol blue (IB) dyes has been carried out. Humin application in this study aims to obtain the optimum pH conditions and kinetics model for adsorption NBB and IB dyes onto humin. Humin was isolated from peat soils originating from Riau, Sumatra. The isolation method used was the alkaline extraction method and the characterization of humin using FTIR spectrophotometer. The total acidity, carboxylic groups and –OH phenolic groups of humin were determined quantitatively using the acid-base titration method. FTIR characterization indicated the presence of an –OH group which was indicated by the appearance of absorption at a wavelength of 3425.3 cm-1 and a stretching vibration of C=O from the –COOH group at a wavelength of 1705 cm-1. The quantitative calculation of the total acidity value, the content of the carboxylic group and the -OH group phenolics of humin were 508.47 cmol kg-1, 289.42 cmol kg-1 and 219.05 cmol kg-1, respectively. The optimum pH conditions for adsorption NBB and IB onto humin occurred at pH 5 and pH 2, respectively. The adsorption kinetics model of NBB and IB on humin followed the Ho kinetics model.

Highlights

The use of synthetic dyes in the textile industry raises environmental problems
Several studies related to the processing of naphtol blue black (NBB) dan indigosol blue (IB) dyes using the adsorption method has been reported, including: Rahmayanti, Yunita, & Putri (2020) using a magnetite-modified humic acid adsorbent to adsorpt NBB dye
Humic acid isolated from Kalimantan peat soil has been reported to have successfully adsorpted NBB (Prandini, & Rahmayanti, 2020) and IB (Santi, & Rahmayanti, 2019) dyes

Summary

INTRODUCTION

The use of synthetic dyes in the textile industry raises environmental problems. Synthetic dyes were non-degredable and carcinogenic, causing the dyes to accumulate in nature and endanger human health. No previous research has quantitatively reported the -COOH and -OH groups contained in humin isolated from peat soils in Riau, Sumatra. In this study, humin was isolated from peat soil of Riau, Sumatra and characterized quantitatively using acid-base titration method. Determination of humin carboxylic group content A total of 100 mg of humin was put into an R60 plastic bottle added 10 mL of 0.5 M Ca (CH3COO) solution and 40 mL of distilled water. A total of 10 mg of humin was put into erlenmeyer and mixed with 10 mL of NBB/IB dye solution with a concentration of 10 mgL-1 with a variation of pH 2, 3; 4; 5; 6; 7; 8 by shaking for 15 minutes filtered using Whatman 41 filter paper. Filtered using Whatman 41 filter paper and the filtrate was analyzed with a UV-Vis spectrophotometer according to the maximum wavelength of NBB/IB

AND DISCUSSION Isolation and Characterization Humin

Findings

CONCLUSIONS