Preparation of Amphiphilic Chitosan-Loaded Bentonite Adsorbent and Its Performance in Removing Organic Matter from Coking Wastewater

• Published in: Polymers Vol. 15; no. 6; p. 1588
• Main Authors: Zhu, Zhou, Kou, Haiqun, Zhou, Yuchang, Lan, Xindian, Yu, Meiying, Chen, Haonan
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 22-03-2023; MDPI
• Subjects: Adsorbents; Adsorption; Alkanes; Bentonite; Bituminous coal; Chemical oxygen demand; Chitosan; Coke industry; Coking; Dosage; Ethanol; Fourier transforms; Molecular structure; Nitrogen; Organic compounds; Organic matter; Pollutants; Scanning electron microscopy; Technology application; Vibration; Wastewater; Wastewater treatment; Water quality; China; Beijing China; United States > US; Japan; chitosan; adsorbent; bentonite; coking wastewater; hydrophobic modification
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym15061588

An amphiphilic chitosan-loaded bentonite adsorbent (C18CTS-BT) was prepared for the efficient removal of organic matter from coking wastewater. The structure and surface morphology of adsorbents were characterized by FT-IR, XRD, and SEM. The removal of those organics by C18CTS-BT was investigated by comparing the adsorption performances of C18CTS-BT with bentonite (BT) and chitosan-loaded bentonite (CTS-BT). The results showed that compared with BT and CTS-BT, C18CTS-BT showed the performance advantages of having a low dosage, wide pH range, and short adsorption equilibrium time. The optimized treatment process was as follows: the adsorbent dosage was 1.5 g·L
, the adsorption time was 60 min, and the pH of the system was 7.0. The chemical oxygen demand (COD) of the coking wastewater treated with BT, CTS-BT, and C18CTS-BT decreased from 342 mg·L
in the raw water to 264 mg·L
, 218 mg·L
, and 146 mg·L
, corresponding to COD removal rates of 22.81%, 36.26%, and 57.31%, respectively. The results of GC-MS analysis also confirmed that C18CTS-BT could remove most of the organic compounds in coking wastewater, especially long-chain alkanes and their derivatives. The hydrophobic modification of the adsorbent material can effectively improve the removal performance of organic compounds from coking wastewater.