Facile Fabrication of Layered Double Hydroxide-Lignin for Efficient Adsorption of Malachite Green

Q2 Pharmacology, Toxicology and Pharmaceutics

Science and Technology Indonesia Pub Date : 2023-04-15 DOI:10.26554/sti.2023.8.2.305-311

N. Palapa, N. Ahmad, A. Wijaya, Zaqiya Artha Zahara

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引用次数: 1

Abstract

Preparation of layered double hydroxide-lignin (lignin-Zn/Al) carried out by coprecipitation method. The FTIR spectra of lignin-Zn/Al displayed at 3448, 2939, 1620, 1381, 1118, 1041, and 601 cm−1. The characteristic peaks are located at 10.1°, 19.1°, 20.1°, 29.4°, 33.9°, and 60.4°. The lignin-Zn/Al nitrogen adsorption-desorption isotherm showed a Type-IV curve, indicating that it had a mesoporous structure. The H3 kind of hysteresis loop also provides evidence for the presence of mesopores within the lignin-Zn/Al complex. Lignin-Zn/Al, lignin, and Zn/Al had pHpzc values of 6.09, 3.01, and 6.09, respectively. Lignin-Zn/Al, lignin, and Zn/Al are positively charged when the pH of the solution is less than pHpzc, and they are negatively charged when the pH of the solution is more than pHpzc. The Langmuir and pseudo-second-order model best represented the MG adsorption onto all adsorbents. The lignin-Zn/Al, lignin, and Zn/Al were shown to have maximum Langmuir adsorption capacities of 83.034, 78.740, and 36.364 mg/g, respectively. Zn/Al adsorption capacity increased 2.28 times after being composited with lignin.

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层状双氧水木质素的制备及其对孔雀石绿的高效吸附

用共沉淀法制备层状双羟基木质素(木质素- zn /Al)。木质素- zn /Al的FTIR光谱显示在3448、2939、1620、1381、1118、1041和601 cm−1处。特征峰位于10.1°、19.1°、20.1°、29.4°、33.9°和60.4°。木质素- zn /Al氮吸附-解吸等温线呈iv型曲线，表明其具有介孔结构。H3型滞回环也为木质素- zn /Al配合物中存在介孔提供了证据。木质素-Zn/Al、木质素和Zn/Al的pHpzc值分别为6.09、3.01和6.09。当溶液pH小于pHpzc时，木质素-Zn/Al、木质素和Zn/Al带正电;当溶液pH大于pHpzc时，木质素-Zn/Al带负电。Langmuir和伪二阶模型最能代表MG在所有吸附剂上的吸附。结果表明，木质素-Zn/Al、木质素-Zn/Al的最大Langmuir吸附量分别为83.034、78.740和36.364 mg/g。与木质素复合后，Zn/Al吸附量提高2.28倍。

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