Review on nanoadsorbents: a solution for heavy metal removal from wastewater

Abstract

Elimination of heavy metals from contaminated streams is of prime concern due to their ability to cause toxic chaos with the metabolism of flora and fauna alike. Use of advanced nano-engineered technologies such as the innovative combination of surface chemistry, chemical engineering fundamentals and nanotechnology opens up particularly attractive horizons towards treatment of heavy metal contaminated water resources. The obtained product of surface engineered nanoadsorbent produced has successfully proven to show rapid adsorption rate and superior sorption efficiency towards the removal of a wide range of defiant heavy metal contaminants in wastewater. The use of these materials in water treatment results in markedly improved performance features like large surface area, good volumetric potential, extra shelf-lifetime, less mechanical stress, stability under operational conditions with excellent sorption behaviour, no secondary pollution, strong chelating capabilities and they are easy to recover and reuse. This review intends to serve as a one-stop-reference by bringing together all the recent research works on nanoparticles synthesis and its advantages as adsorbents in the treatment of heavy metal polluted wastewater that have so far been undertaken, thereby providing researchers with a deep insight and bridging the gap between past, present and future of the elegant nanosorbents.

Chromium removal from contaminated waters using nanomaterials – A review

“…41 the uptake capacity values which do not presented a subscript were obtained either experimentally or by Langmuir model; sometimes, the authors refer to experimental conditions of experiments whose results they do not present; from column "Type of water" until "Cr starting specie", the conditions mentioned are the same for the below lines M A N U S C R I P T 4 [86] Cs-g-PBA/SG Chitosan-gpoly(butylacrylate)/ silica gel nanocomposite Milli-Q water 2.0-9. Research undertaken so far and the conditions used on this topic is here compiled.…”

Interband transitions in closed-shell vacancy containing graphene quantum dots complexed with heavy metals

“…), [13][14][15] design of sensitive materials and devices (electrodes, hybrid structures, field emission transistors, and Schottky diodes), [16][17][18][19][20][21][22][23][24][25] and fabrication of potent adsorbents (filters, and membranes). [26][27][28][29][30][31][32][33][34][35] Considering the drawbacks of the traditional ''bulky'' time-consuming techniques, numerous research groups, nowadays, investigate graphene-family materials (graphene quantum dots, reduced graphene oxide, epitaxial graphene, etc.) as possible candidates for conceptualization of both sensors and adsorbents.…”

Green synthesis of graphene oxide‐MnFe2O4composites and their application in removing heavy metal ions

“…Among these techniques, adsorption, which is facile to perform and design, has been considered as one of the most attractive and promising methods. Numerous different adsorbents including activated carbon, zeolite, biochar, metallic oxides, organic material, ion exchange resins and different nanostructured materials [6, 7] have been studied for the removal of heavy metals. Since the adsorbents play a vital role in the adsorption process, the development of novel effective adsorbents is essential for water purification.…”