Magnesium Silicate Polymer as a Coagulant for Reactive Dye Removal from Wastewater: Considering the Intrinsic pH in Magnesium Silicate Polymer and Coagulation Behavior

Abstract

A magnesium silicate polymeric coagulant (MgSiPC), which is an inorganic polymer for dye removal from wastewater, was prepared with different pH by copolymerization. The acidity was a key factor in the preparation of the MgSiPC. In the present research, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were used to analyze the characterization of optimum coagulants. Additionally, the response surface method (RSM) was applied to optimize the process of coagulation–flocculation. The results of FT-IR and XRD implied that the main components of the MgSiPC with pH 1.50–2.50 were almost the same. SEM images showed that MgSiPCs with pH 1.50–2.50 exhibited different structures including cluster and lamellar shape structure, compact rod-like and network structure, and a kind of irregular geometry shape structure. In the process of coagulation–flocculation, MgSiPCs with pH 1.50–2.50 showed highly efficient coagulation performance. The removal rate of reactive yellow 2(RY2) could reach above 90% at a dosage of 50–70 mg/L and initial pH 12.00, while the removal rate of reactive blue 2 (RB2) could attain above 93% at a dosage of 50–80 mg/L and initial pH 12.00. Moreover, MgSiPCs with pH 2.00 had the highest efficiency. The results of RSM showed that the optimum combination of the MgSiPC’s dosage and initial pH was 62 mg/L and 12.08 for RY2 and 78 mg/L and 12.00 for RB2, respectively. Under optimum experimental conditions, the predicted data from this model were 96% for RY2 and 100% for RB2, which was consistent with the actual experimental data. Therefore, a pH of 2.00 is considered to be the optimal acidity for preparing MgSiPCs.

Degradation of Diazo Congo Red Dye by Using Synthesized Poly-Ferric-Silicate-Sulphate through Co-Polymerization Process

“…A review of the studies dealing with the application of different polymeric inorganic coagulants in reactive blue [ 25 , 48 , 49 ], reactive yellow [ 48 ], disperse yellow [ 25 ], Congo red [ 23 ], acid red [ 22 ], and simulated dyeing wastewater [ 50 , 51 ] removal published from 2011 to 2020 is presented in Table 1 .…”

Recent advances of silicate materials for wastewater treatment: a review

“…The high adsorption efficiency can be attributed to the connection between the electronegative oxygen atoms in formaldehyde molecules and the silicon groups present on AP-CSH, in contrast to other materials reported. Recent studies have also investigated the structures of rodlike [126], cage-like [127], and vesicle-like silicates, underscoring the significance of structure in their application for wastewater treatment. Some novel methods have been developed to address the limitations of conventional methods in the fabrication of silicate-based composite adsorbents.…”

Aluminum Montmorillonite/Polyaniline Hybrid Composite-Based Organogels for the Expurgation of Carcinogenic Chlorophenols and Congo Red Dye from Defiled Water Sources

“…However, biological remedies being an age-old method are inadequate to remove advanced complex pollutants of recent times . Advanced oxidative processes, electrochemical destruction, and ion exchange require the use of chemicals with continuous electricity. , Membrane filtration involves fouling and clogging, while sludge formation occurs between pollutants and coagulants through the coagulation process providing hindrance for purification . The filtration process requires high maintenance with its repairing .…”

“…8,9 Membrane filtration involves fouling and clogging, while sludge formation occurs between pollutants and coagulants through the coagulation process providing hindrance for purification. 10 The filtration process requires high maintenance with its repairing. 11 The photochemical process is highly efficient for the degradation of organic dyes, 12,13 but the presence of hydroxyl and superoxide scavenging radicals in the treated sources prevents them from being used for the treatment of recalcitrant pollutants to avoid threats to aquatic species.…”