Adsorption of Congo Red onto Humic Acid Isolated from Peat Soil Gambut Regency, South Kalimantan

Q3 Chemistry

Molekul Pub Date : 2023-07-10 DOI:10.20884/1.jm.2023.18.2.8685

Dewi Umaningrum, Radna Nurmasari, U. Santoso, M. Astuti, Hapsari Tyas Pradita

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Abstract

Humic acid is one of the green materials for wastewater treatment including for removal dyes as an adsorbent. Humic acid was isolated from peat soil, Gambut Regency, South Kalimantan following International Humic Substances Society method, and used to adsorb Congo red. The adsorption process was carried out in a batch system and the effect of pH, contact time, and adsorption capacity of Congo red on humic acid were studied. The adsorbent characterization by using FTIR. The results showed that the adsorption of Congo red on humic acid occurred at the optimum pH of pH 6, the optimum contact time was 120 minutes. The adsorption capacity of Congo red onto humic acid of 33.33 mg/g and follows the Langmuir model with R2 = 0.9926. The characterization of humic acid functional groups before and after adsorption of Congo red showed that the signal at 1,712.79 cm-1 were shifted to 1,705.07 cm-1 and 1,273.02 cm-1 were shifted to 1,265.30 cm-1. These suggested that the mechanism interaction was the electrostatic interaction between -NH3+ functional group of Congo red group and -COO- functional group of humic acid. It means that humic acid isolated from peat soil could be used as an adsorbent for the removal Congo red.

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刚果红在南加里曼丹泥炭土甘布县腐殖酸上的吸附

腐殖酸是一种用于废水处理的绿色材料，包括作为吸附剂去除染料。采用国际腐殖物质学会的方法，从南加里曼丹甘布县泥炭土中分离出腐殖酸，并将其用于吸附刚果红。在分批系统中进行吸附过程，研究了pH、接触时间和刚果红对腐殖酸的吸附能力的影响。利用FTIR对吸附剂进行了表征。结果表明，刚果红在腐殖酸上的吸附发生在最适pH为6时，最适接触时间为120分钟。刚果红对腐殖酸的吸附量为33.33mg/g，符合Langmuir模型，R2=0.9926。吸附刚果红前后腐殖酸官能团的表征表明，1712.79cm-1处的信号转移到1705.07cm-1，1273.02cm-1处的信号移动到1265.30cm-1。这表明，机理相互作用是刚果红的-NH3+官能团与腐殖酸的-COO-官能团之间的静电相互作用。这意味着从泥炭土中分离出的腐殖酸可以用作去除刚果红的吸附剂。

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