Synthesis of nanocomposites from cationic polyacrylamide and modified carbon black: Application as flocculants for oily sludge suspension

Abstract

Carbon black was modified using various liquid-phase oxidation methods (modified carbon black = m-CB, m = (1, 2, 3): 1, sulfuric acid/potassium permanganate method; 2, nitric acid method; 3, hydrogen peroxide method). With acetone-ethylene glycol as initiator, dimethyldiallylammonium chloride (DMDAAC) and acrylamide (AM) as monomer, cationic polyacrylamide (CPAM) was prepared by UV excitation of the monomer. The m-CB/CPAM nanocomposites were synthesized using a hydrothermal method. The factors that affected the molecular weight of CPAM were investigated, including the total monomer concentration, the dosage of the complex initiator, the mass ratio of m AM :m DMDAAC and the UV irradiation time. The chemical structures and morphologies of the samples were characterized using Fourier transform infrared spectroscopy, thermogravimetric analysis, elemental composition, X-ray diffraction and scanning electron microscopy. 1-CB/CPAM was utilized to flocculate oil sludge suspension, and the effects of 1-CB quality, 1-CB/CPAM dosage, temperature and pH value on the flocculation performance of 1-CB/ CPAM were investigated. The flocculation mechanism of 1-CB/CPAM was also analyzed. The results show that 1-CB/CPAM has an outstanding flocculation effect, and it flocculates oil sludge particles by adsorption bridging and charge neutralization in acidic and alkaline conditions.

Research Progress on Typical Quaternary Ammonium Salt Polymers

“…The results showed that the flocculant had obvious advantages in treating oil-bearing wastewater. Similar studies, for example, the study in 2019 by Tian et al [129], synthesized P(DMC-AM) on the modified composite nanomaterials by reacting activated carbon with DMC and AM and used it to conduct flocculation of an oil-sludge suspension to analyze the flocculation mechanism. The results showed that the material not only had a remarkable flocculation effect, but also realized the flocculation of sludge particles by adsorption bridging and charge neutralization in acidic and alkaline conditions.…”

A review of nano-based materials used as flocculants for water treatment

“…Modified carbon black/cationic polyacrylamide (m-CB/CPAM) nanocomposites were synthesised and used byTian et al (2018) as flocculants for oil sludge suspension treatment. Several factors such as the total monomer concentration, the dosage of the complex initiator, the mass ratio ofacrylamide (AM) to dimethyldiallylammonium chloride (DMDAAC) [mAM:mDMDAAC] and the UV irradiation time were found to affect the molecular weight of CPAM.…”