Rapid, efficient and economic removal of organic dyes and heavy metals from wastewater by zinc-induced in-situ reduction and precipitation of graphene oxide

Recent Advances in Applications of Hybrid Graphene Materials for Metals Removal from Wastewater

“…Moreover, as shown in Table 2 the adsorption capacity of lead (II) on various graphene materials are exceptionally high and ranged between 150 and 1000 mg/g, which are much higher than the capacity on other adsorbents including coconut-based activated carbon (83 mg/g) [103], activated Melocanna baccifera Roxburgh charcoals (bamboo) (77 mg/g) [104], chitosan (115 mg/g) [105], sphagnum peat moss (75 mg/g) [106], e-waste exchange resin and Lewatit (721 and 391 mg/g) [107], and steel-making dust (209 mg/g) [108]. In one report, the measured capacity of Lead on GO+Zn@NH 4 Cl was 17,900 mg/g which is extremely high, although the conditions and results of the study may not be realistic [97].…”

“…In comparison, GO-based adsorbents had better results overall with capacities ranging from 3.6 mg/g to 426 mg/g. In a highlight case, a huge capacity of 8.4 g/g was reached where the adsorption process happened using the in-situ reduction of GO with NH 4 Cl and Zinc [97]. The entire list of GO-based adsorbents followed the pseudo second order kinetic model.…”

In Vitro Bioadsorption of Cd2+ Ions: Adsorption Isotherms, Mechanism, and an Insight to Mycoremediation

“…Therefore, a number of traditional physiochemical treatment techniques have been reported to remove the heavy metals from wastewater, especially from the industrial wastewater, to name a few, electro-coagulation, solvent extraction, ion-exchange, electro-reduction, reverse osmosis, adsorption, membrane separation, chemical precipitation, and so on [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Even though used widely, these above-mentioned techniques exhibited several disadvantages which include the utilization of high-cost equipment and monitoring systems, the use of various expensive chemicals, the discharge of toxic sludge, long processing time, the production of toxic waste products that need further processing, and so on [23][24][25][26][27][28][29][30][31]. Thus, it is the necessity of the time to develop a new, simple, and inexpensive method for heavy metal removal from wastewater.…”

Preparation and Pb (II) adsorption in aqueous of 2D/2D g‐C3N4/MnO2 composite

“…The harmful impacts of heavy metals in the environment are mainly attributed to the fact that they cannot be degraded biologically towards animals, plants and human beings . Many technologies, such as membrane filtration, electrolysis, ion‐exchange, adsorption and precipitation, have been studied for the treatment of heavy metals in effluents. Specially, adsorption is considered to be one of the most effective methods for removal of contaminants .…”