Cetyl trimethyl ammonium bromide-modified magnetic biochar-integrated sand filter for microplastics removal from secondary-treated sewage effluents: Performance evaluation and mechanistic insights

溴化铵 流出物 生物炭 微塑料 环境化学 污水 化学 环境科学 制浆造纸工业 废物管理 环境工程 有机化学 工程类 肺表面活性物质 生物化学 热解
作者
Neha Parashar,Subrata Hait
出处
期刊:Journal of water process engineering [Elsevier BV]
卷期号:59: 105035-105035 被引量:6
标识
DOI:10.1016/j.jwpe.2024.105035
摘要

Microplastics (MPs) discharge from effluent of sewage treatment plants (STPs) has prompted the need for effective treatment techniques. In this context, the present study provides insights on the preparation and use of cetyl trimethyl ammonium bromide (CTAB)-modified magnetic biochar (MBC-CTAB) as an adsorbent and integrated it in a sand filter for improved MPs removal from aqueous matrices. Rice husk biochars were synthesized, surface modified with FeCl3 and CTAB, and assessed for their MPs removal efficiency. Effects of various factors were analyzed from synthetic water spiked with 1 μm sized polystyrene MPs during batch and fixed-bed column studies. Optimal conditions yielded a maximum MPs removal of >97 % with MBC-CTAB at 7 mg/50 mL, pH 4, mixing speed of 180 rpm for 3 min during batch studies. Adsorption kinetics followed the pseudo-second-order model (R2 = 0.91), and the Langmuir model (R2 = 0.94) described the adsorption isotherm with a maximum capacity of 247 mg/g. Column studies removed ∼98 % MPs in real-time secondary sewage effluents using MBC-CTAB-integrated sand filter at flow rate: 5 mL/min, bed height: 4 cm, and MPs concentration: 7 mg/L. Electrostatic and hydrophobic interactions, hydrogen bonding, and pore-filling were the key MPs removal mechanisms. The application of the developed technique in efficient MPs removal highlights its practical relevance as sustainable approach for removing MPs from sewage effluents, which is a shared global concern.
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