Polypyrrole-coated gum ghatti-grafted poly(acrylamide) composite for the selective removal of hexavalent chromium from waste water

Goddeti, Siva Mohan Reddy; Maity, Arjun; Ray, Suprakas Sinha

doi:10.1016/j.ijbiomac.2020.07.324

Cited by 23 publications

(9 citation statements)

References 43 publications

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“…The adsorbent dosage of 5 mg resulted in an adsorption capacity of 152.25 mg/g for PPy/GO/n‐ZVI composites, and the adsorption capacity declined as the adsorbent dosage was raised. The optimum adsorbent dose of 5 mg of PPy/GO/n‐ZVI composite for the treatment of 20 mL of a 50 mg/L Cr (VI) solution was determined, and this system was utilised to optimise the other parameters [1] . Cr (VI) exists in water as Cr 2 O 7 2− , HCrO 4 − , and CrO 4 2− at pH less than 2, below pH 6, and above pH 6 respectively [55] .…”

Section: Resultsmentioning

confidence: 99%

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Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

2023

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The hexavalent chromium in water is extremely toxic to most living organisms and can cause many diseases. In this work, we developed Polypyrrole (PPy), Polypyrrole/graphene oxide (PPy/ GO) nanocomposite, and Polypyrrole/graphene oxide/zerovalent iron nanoparticles (PPy/GO/n-ZVI) nanocomposite for adsorption of Cr (VI) from water. PPy/GO nanocomposite showed the highest Cr (VI) removal capacity for 10 % (weight) loading of GO. PPy/GO/n-ZVI nanocomposite showed the highest Cr (VI) adsorption capacity for 50 % iron nanoparticle loading. Chemical kinetics data showed that Cr (VI) adsorption occurred with pseudo-second-order. The maximum adsorption capacity (q max ) was found to be 64.29 mg/g, 129.09 mg/g, and 171.04 mg/g on PPy, PPy/GO nanocomposite, and PPy/GO/n-ZVI nanocomposite respectively. The thermodynamic study showed a positive value of ΔS, and a negative value of ΔG indicated rise in the disorder at the adsorbate-adsorbent interface and spontaneous nature of Cr (VI) adsorption. ΔH was close to 21 kJ/mole indicating adsorption process occurred via physisorption. The recycling of the adsorbent was carried out by washing with sodium hydroxide and Cr (VI) removal efficiency decreased by around twenty % in the fifth cycle. The present study suggests that the PPy/GO/n-ZVI nanocomposite is an environment-friendly magnetic material and provides a simple, low-cost strategy for the adsorption of Cr (VI) from wastewater.

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Section: Resultsmentioning

confidence: 99%

“…71 % earth's surface is covered with water and 3 % is the only fresh water. However, 0.4 % is only usable/drinkable water for 7.7 billion people across the globe [1] . The rapid growth of population increases the industrialization causing enhanced number of toxic effluents discharged into the surface water sources [2,3] .…”

Section: Introductionmentioning

confidence: 99%

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

2023

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“…废水中阴离子类型的污染物主要分为无机阴离子型污染物 [10] 和有机阴离子型污染物 [11] . 无机阴离子污染物(主要包括重铬酸盐 [12] 、砷酸盐 [13] 、硝酸盐 [14] 、高氯酸盐 [15] 、硒酸盐 [16] 等)广泛存在于废水中, 且对人类及生态环境存在严重的危害. 例如, 硝酸盐(NO 3 − )、磷酸盐(PO 4 3− )会使水体富营养化, 人体过量摄入会引起高铁血红蛋白症 [17] ; 水体中的Cr(VI)以Cr 2 O 7 2− 阴离子的形式存在, 其难以通过富集降解, 且比处理其他污染物更困难, 人体吸入或接触皮肤会对肾脏和肝脏造成危害 [18] ; 高氯酸盐会影响人体内甲状腺吸收碘, 从而影响成人的新陈代谢和婴幼儿的正常生长 [19] ; 砷酸盐具有强生物毒性, 可致使植物营养生长不良 [20] , 进入人体会影响细胞的正常代谢 [21] .…”

Section: 阴离子污染物指水中以阴离子形式存在的离子态污染物质此类污染物是废水中一个较为重要的污染unclassified

Research progress in the treatment of anionic pollutants in wastewater

Xiu-xia¹,

Shang²,

Zhang³

et al. 2021

Sci. Sin.-Chim

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Most of the anionic pollutants in wastewater are toxic and harmful to the natural environment and human health. Anionic contamination and its treatment have emerged as an escalating challenge globally. It is imperative to develop technology and methods to achieve the effective removal of anionic pollutants. Extraordinary efforts have been made to overcome the challenges of wastewater treatment in recent years. In this paper, the treatment of anionic pollutants in wastewater are reviewed, respectively from the physical treatment, chemical treatment, physical and chemical treatment, and biological treatment. Various techniques such as physical procedures like adsorption and membrane filtration, chemical methods like reduction method and coprecipitation process, and several biological techniques have been recognized for the treatment of wastewater. Meanwhile, the effects of different methods on the treatment of anionic pollutants in wastewater were summarized, and the advantages and disadvantages of each treatment method were compared and analyzed. This review communicates insights into recent research developments in different treatment techniques and their applications to eradicate various water contaminants. Finally, the future research direction of anionic pollutants treatment technology in wastewater is prospected. This will provide methods and data support for the treatment and practical application of anionic pollutants in wastewater.

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“…Thus, considerable researches have focused on the modification of the surface structures of polymers to minimize the self-agglomeration and assemble more robust functional groups to enhance the adsorption of Cr(VI) and to simplify the reuse of these materials [ 14 , 15 ]. Strategies, including coating on the other substrate materials [ 13 ], reconstructing the structure of polymers through crosslinking and hybridization [ 14 , 16 ], grafting functional groups and branched chains [ 17 ], and acting as a scaffold to combine with other absorbents [ 18 ], are applied. For example, PPy coated molybdenum disulfide organic–inorganic composites exhibited much higher sorption capacity for Cr(VI) than neat PPy (257.7 vs. 151.3 mg/g) [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Yuan

Luo

et al. 2023

Polymers

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Sorptive removal of hexavalent chromium (Cr(VI)) bears the advantages of simple operation and easy construction. Customized polymeric materials are the attracting adsorbents due to their selectivity, chemical and mechanical stabilities. The mostly investigated polymeric materials for removing Cr(VI) were reviewed in this work. Assembling of robust functional groups, reduction of self-aggregation, and enhancement of stability and mechanical strength, were the general strategies to improve the performance of polymeric adsorbents. The maximum adsorption capacities of these polymers toward Cr(VI) fitted by Langmuir isotherm model ranged from 3.2 to 1185 mg/g. Mechanisms of complexation, chelation, reduction, electrostatic attraction, anion exchange, and hydrogen bonding were involved in the Cr(VI) removal. Influence factors on Cr(VI) removal were itemized. Polymeric adsorbents performed much better in the strong acidic pH range (e.g., pH 2.0) and at higher initial Cr(VI) concentrations. The adsorption of Cr(VI) was an endothermic reaction, and higher reaction temperature favored more robust adsorption. Anions inhibited the removal of Cr(VI) through competitive adsorption, while that was barely affected by cations. Factors that affected the regeneration of these adsorbents were summarized. To realize the goal of industrial application and environmental protection, removal of the Cr(VI) accompanied by its detoxication through reduction is highly encouraged. Moreover, development of adsorbents with strong regeneration ability and low cost, which are robust for removing Cr(VI) at trace levels and a wider pH range, should also be an eternally immutable subject in the future. Work done will be helpful for developing more robust polymeric adsorbents and for promoting the treatment of Cr(VI)-containing wastewater.

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Polypyrrole-coated gum ghatti-grafted poly(acrylamide) composite for the selective removal of hexavalent chromium from waste water

Cited by 23 publications

References 43 publications

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

Graphene‐Oxide‐Coated, Polypyrrole‐Supported, Nano Zerovalent Iron Nanocomposites for Adsorption of Hexavalent Chromium from Wastewater

Research progress in the treatment of anionic pollutants in wastewater

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

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