Amino siloxane oligomer-linked graphene oxide as an efficient adsorbent for removal of Pb(II) from wastewater

Luo, Shenglian; Xu, Xiangli; Zhou, Guiyin; Liu, Chengbin; Tang, Yanhong; Liu, Yutang

doi:10.1016/j.jhazmat.2014.03.062

Cited by 239 publications

(95 citation statements)

References 61 publications

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“…It is found that the correlation coefficients (R 2 ) of the modeled pseudo-second-order by experiment data of Pb(II) and Cd(II) are above 0.97, larger than those of the modeled pseudo-first-order, which proves that the sorption kinetics of Pb(II) and Cd(II) on the sorbent are well described by pseudo-second-order rate equation. In general, the pseudo-secondorder model is superior for describing practical experimental data (Luo et al, 2014b). …”

Section: Adsorption Kineticsmentioning

confidence: 99%

A highly efficient polyampholyte hydrogel sorbent based fixed-bed process for heavy metal removal in actual industrial effluent

et al. 2016

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a b s t r a c tHigh sorption capacity, high sorption rate, and fast separation and regeneration for qualified sorbents used in removing heavy metals from wastewater are urgently needed. In this study, a polyampholyte hydrogel was well designed and prepared via a simple radical polymerization procedure. Due to the remarkable mechanical strength, the three-dimensional polyampholyte hydrogel could be fast separated, easily regenerated and highly reused. The sorption capacities were as high as 216.1 mg/g for Pb(II) and 153.8 mg/g for Cd(II) owing to the existence of the large number of active groups. The adsorption could be conducted in a wide pH range of 3e6 and the equilibrium fast reached in 30 min due to its excellent water penetration for highly accessible to metal ions. The fixed-bed column sorption results indicated that the polyampholyte hydrogel was particularly effective in removing Pb(II) and Cd(II) from actual industrial effluent to meet the regulatory requirements. The treatment volumes of actual smelting effluent using one fixed bed column were as high as 684 bed volumes (BV) (7736 mL) for Pb(II) and 200 BV (2262 mL) for Cd(II). Furthermore, the treatment volumes of actual smelting effluent using tandem three columns reached 924 BV (31,351 mL) for Pb(II) and 250 BV (8483 mL) for Cd(II), producing only 4 BV (136 mL) eluent. Compared with the traditional high density slurry (HDS) process with large amount of sludge, the proposed process would be expected to produce only a small amount of sludge. When the treatment volume was controlled below 209.3 BV (7103 mL), all metal ions in the actual industrial effluent could be effectively removed (<0.01 mg/L). This wok develops a highly practical process based on polyampholyte hydrogel sorbents for the removal of heavy metal ions from practical wastewater.

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Section: Adsorption Kineticsmentioning

confidence: 99%

A highly efficient polyampholyte hydrogel sorbent based fixed-bed process for heavy metal removal in actual industrial effluent

et al. 2016

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“…The focus of the adsorption process was to obtain an abundant and inexpensive adsorbent with high adsorption capacity. A variety of traditional adsorbents, for example activated carbon (Monser and Adhoum, 2009;Raoa et al, 2009), mineral materials (Mhamdi et al, 2013;Figueiredo and Quintelas, 2014) and inorganic materials (Luo et al, 2014) have been utilized to remove Pb(II) from wastewater. However, the high cost and limited reusability hinder the widespread application of these adsorbents (Kurniawan et al, 2006b).…”

Section: Introductionmentioning

confidence: 99%

Removal of Pb(II) from aqueous solutions by Phytolacca americana L. biomass as a low cost biosorbent

Wang

Zhang

Yao

et al. 2018

Arabian Journal of Chemistry

114

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Screening a new biosorbent with low cost and high efficiency from a native plant material is a key to the adsorption of heavy metal ions from wastewater. In this study, the potential of Phytolacca americana L. as a biosorbent for Pb(II) removal from aqueous solutions was investigated. Experiments were performed to evaluate the effect of biosorbent dosage, pH, initial Pb(II) concentration and contact time on the Pb(II) removal. The results indicated that the hydroxyl, carboxyl and amine groups may take part in Pb(II) binding. HNO 3 -modified P. americana (HPAL) showed a significant higher uptake capacity compared to original P. americana (PAL) (p < 0.05). A dose of 20 g L À1 of biosorbents in solutions with an initial pH of 6.0, an initial Pb(II) concentration of 30 mg L À1 and a contact time of 120 min resulted in the maximum Pb(II) removal efficiency. The Freundlich isotherm gave a better fit than the Langmuir isotherm revealed that the biosorption was potentially multilayer. Further, the adsorption kinetics followed a pseudo second-order model, which implied that the biosorption was mainly a chemisorption process. The thermodynamic properties showed that the Pb(II) adsorption onto the P. americana biomass was feasible, spontaneous and exothermic in nature. Both physisorption and chemisorption were involved in the biosorption of Pb(II) onto the surface of P. americana biomass through electrostatic interaction and ion exchange. Additionally, desorption studies revealed promising regeneration potential of these biosorbents. The present study showed that P. americana biomass could be used

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“…Chemical reagents, including graphite, potassium permanganate, sulfuric acid, sodium nitrate, hydrochloric acid, tetrahydrofurane (THF), dichloromethane (DCM), phosphorous pentachloride, calcium hydride, 2,2 0 -dipyridylamine (DPA), Pb(NO 3 …”

Section: Methodsmentioning

confidence: 99%

“…These toxic metal ions are widely charged into aquatic environment from metallurgical engineering, metal plating, mining, ceramics, battery manufacturing. Since these ions are quickly spread to large area due to high mobility, their removal from environment is one of the challenges in today's science [1][2][3]. The pollutants in water can be removed by several methods, such as desalination, flotation, membranes, sedimentation, disinfection, filtration, adsorption [4].…”

Section: Introductionmentioning

confidence: 99%

Highly efficient simultaneous ultrasonic-assisted adsorption of Pb(II), Cd(II), Ni(II) and Cu (II) ions from aqueous solutions by graphene oxide modified with 2,2′-dipyridylamine: Central composite design optimization

Zare‐Dorabei

Ferdowsi

Barzin

et al. 2016

Ultrasonics Sonochemistry

209

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In present work, a graphene oxide chemically modified with 2,2'-dipyridylamine (GO-DPA), was synthesized by simple, fast and low-cost process for the simultaneous adsorption of four toxic heavy metals, Pb(II), Cd(II), Ni(II) and Cu(II), from aqueous solutions. The synthesized adsorbent was characterized by FT-IR, XRD, XPS, SEM and AFM measurements. The effects of variables such as pH solution, initial ion concentrations, adsorbent dosage and sonicating time were investigated on adsorption efficiency by rotatable central composite design. The optimum conditions, specified as 8mg of adsorbent, 20mgL(-1) of each ion at pH 5 and short time of 4min led to the achievement of a high adsorption capacities. Ultrasonic power had important role in shortening the adsorption time of ions by enhancing the dispersion of adsorbent in solution. The adsorption kinetic studies and equilibrium isotherms for evaluating the mechanism of adsorption process showed a good fit to the pseudo-second order and Langmuir model, respectively. The maximum adsorption capacities (Qm) of this adsorbent were 369.749, 257.201, 180.893 and 358.824mgg(-1) for lead, cadmium, nickel and copper ions, respectively. The removal performance of adsorbent on the real wastewater samples also showed the feasibility of adsorbent for applying in industrial purposes.

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Amino siloxane oligomer-linked graphene oxide as an efficient adsorbent for removal of Pb(II) from wastewater

Cited by 239 publications

References 61 publications

A highly efficient polyampholyte hydrogel sorbent based fixed-bed process for heavy metal removal in actual industrial effluent

A highly efficient polyampholyte hydrogel sorbent based fixed-bed process for heavy metal removal in actual industrial effluent

Removal of Pb(II) from aqueous solutions by Phytolacca americana L. biomass as a low cost biosorbent

Highly efficient simultaneous ultrasonic-assisted adsorption of Pb(II), Cd(II), Ni(II) and Cu (II) ions from aqueous solutions by graphene oxide modified with 2,2′-dipyridylamine: Central composite design optimization

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