Removal of cadmium(II) from aqueous solutions by chemically modified maize straw

Guo, Hong; Zhang, Shufen; Kou, Zinong; Zhai, Shangru; Ma, Wei; Yang, Yi

doi:10.1016/j.carbpol.2014.08.041

Cited by 112 publications

(43 citation statements)

References 36 publications

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“…These changes eventually indicate the successful incorporation of succinic anhydride into the AC solids [42]. Previous studies have shown that a new distinguished peak was observed at around 1730 cm −1 after the incorporation of succinic anhydride into posidonia and maize straw [35,43]. However, in this study, a new peak overlapped with the pre-existing peaks and caused an increase in the peak intensity.…”

Section: Characterization Of Materialscontrasting

confidence: 49%

“…It is observed that the incorporation of succinic anhydride significantly changed the surface morphology of the AC, and the pores are less visible after the functionalization of the AC. A previous report also had shown that the surface morphology of maize straw was significantly changed after the incorporation of succinic anhydride [35]. The nitrogen adsorption isotherms of the AC and functionalized-AC are shown in Figure 2.…”

Section: Characterization Of Materialsmentioning

confidence: 97%

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Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

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Areca nut waste was utilized to obtain high surface area activated carbon (AC), and it was further functionalized with succinic anhydride under microwave irradiation. The surface morphology and surface functional groups of the materials were discussed with the help of scanning electron microscope(SEM) images and fourier transform infra-red (FT-IR) analysis. The specific surface area of the AC and functionalized-AC was obtained by the Brunauer-Emmett-Teller (BET) method, and found to be 367.303 and 308.032 m 2 /g, respectively. Batch experiments showed that higher pH favoured the removal of Hg(II), whereas the phenol removal was slightly affected by the changes in the solution pH. The kinetic data followed pseudo-first order kinetic model, and intra-particle diffusion played a significant role in the removal of both pollutants. The maximum sorption capacity of Hg(II) and phenol were evaluated using Langmuir adsorption isotherms, and found to be 11.23 and 5.37 mg/g, respectively. The removal of Hg(II) was significantly suppressed in the presence of chloride ions due to the formation of a HgCl 2 species. The phenol was specifically adsorbed, forming the donor-acceptor complexes or π-π electron interactions at the surface of the solid. Further, a fixed-bed column study was conducted for both Hg(II) and phenol. The loading capacity of the column was estimated using the nonlinear Thomas equation, and found to be 2.49 and 2.70 mg/g, respectively. Therefore, the study showed that functionalized AC obtained from areca nut waste could be employed as a sustainable adsorbent for the simultaneous removal of Hg(II) and phenol from polluted water.

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Section: Characterization Of Materialscontrasting

confidence: 49%

Section: Characterization Of Materialsmentioning

confidence: 97%

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

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“…The plot of freundlich adsorption isotherm is presented in Figure 7.The maximum adsorption capacity of Cr(VI) onto clinoptililite based on studied isotherm models are compared with fi ndings of other researchers in Table 3. Reaction time and dimensions of the reactor depend on the adsorption kinetics 45 . The kinetic parameters and correlation coeffi cients of pseudo-fi rst order and pseudo--second order kinetic models are presented in Table 4.…”

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confidence: 99%

Adsorption of Cr(VI) by Natural Clinoptilolite Zeolite from Aqueous Solutions: Isotherms and Kinetics

Jorfi

Ahmadi

Pourfadakari

et al. 2017

Polish Journal of Chemical Technology

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The main aim of this study was to evaluate the effi ciency of natural zeolite for Cr(VI) removal from aqueous solutions. Following simple modifi cation of adsorbent, the effect of operational parameters including pH (2-10), adsorbent dosage (2-20 g/L), contact time (5-150 min) and Cr(VI) concentration (10-50 mg/L) were studied according to one-factor-at-a-time procedure. The maximum Cr(VI) removal of 99.53% was obtained at initial pH of 2, contact time of 30 min, adsorbent dosage of 8 g/L and initial chromium concentration of 10 mg/L. The Freundlich isotherm was best fi tted with experimental data (R2 = 0.951). Also, type 1pseudo second order kinetic model showed the most correlation (R2 = 1) with the experimental data. According to obtained results, it can be concluded that the application of clay-like adsorbents such as natural clinoptilolite zeolite can be considered as an effi cient alternative for fi nal treatment of effl uents containing Cr(VI).

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“…The electrostatic attraction between the hydroxide group and the free electron-pairs from cadmium ions enhanced [21]. The increase of pH also indicated that the surface became negatively charged, making cations adsorption (which in this case the Cd 2+ ) more favorable [22]. …”

Section: Cadmium Removalmentioning

confidence: 98%

NanoCrystalline Cellulose isolated from oil palm empty fruit bunch and its potential in cadmium metal removal

Lim

Chew

Choong

et al. 2016

MATEC Web of Conferences

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Abstract. NanoCrystalline Cellulose (NCC) was isolated via ultrasonic cavitation assisted acid hydrolysis method. Characterization was done using Dynamic Light Scattering (DLS) together with Scanning Electron Microscope (SEM) imaging to double prove the existence of NCC. DLS measures length of 236.6 nm with width of 34.40 nm, supported by SEM which showed NCC a rod-like shaped particle with large surface area and high porosity. It was then attempted for heavy metal cadmium ion (Cd 2+ ) removal from aqueous solution. The pH implication to the rate of Cd 2+ adsorption was investigated by varying the solution to pH 4, pH 7 and pH 10 over a duration of 120 minutes. The removal efficiency was analyzed using Atomic Absorption Spectroscopy (AAS) resulting in pH 7 being the most favorable for Cd 2+ removal.

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Removal of cadmium(II) from aqueous solutions by chemically modified maize straw

Cited by 112 publications

References 36 publications

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Adsorption of Cr(VI) by Natural Clinoptilolite Zeolite from Aqueous Solutions: Isotherms and Kinetics

NanoCrystalline Cellulose isolated from oil palm empty fruit bunch and its potential in cadmium metal removal

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