Synthesis of a novel silica-supported dithiocarbamate adsorbent and its properties for the removal of heavy metal ions

Bai, Lan; Hu, Huiping; Fu, Weng; Wan, Jia; Cheng, Xi; Zhuge, Lei; Xiong, Lei; Chen, Qiyuan

doi:10.1016/j.jhazmat.2011.08.038

Cited by 211 publications

(72 citation statements)

References 58 publications

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“…There is no difference among different mHCs for Cd adsorption. It is possible that the rate limiting step in adsorption of mHCs for Cd(II) is a chemical adsorption process rather than diffusion (Bai et al 2011). Figure 7 presents cadmium sorption isotherms for unmodified and KOH-modified hydrochars.…”

Section: Xrd Analysismentioning

confidence: 99%

Characterization of potassium hydroxide (KOH) modified hydrochars from different feedstocks for enhanced removal of heavy metals from water

Sun

Tang

Gong

et al. 2015

Environ Sci Pollut Res

181

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Hydrochars produced from different feedstocks (sawdust, wheat straw, and corn stalk) via hydrothermal carbonization (HTC) and KOH modification were used as alternative adsorbents for aqueous heavy metals remediation. The chemical and physical properties of the hydrochars and KOH-treated hydrochars were characterized, and the ability of hydrochars for removal of heavy metals from aqueous solutions as a function of reaction time, pH, and initial contaminant concentration was tested. The results showed that KOH modification of hydrochars might have increased the aromatic and oxygen-containing functional groups, such as carboxyl groups, resulting in about 2-3 times increase of cadmium sorption capacity (30.40-40.78 mg/g) compared to that of unmodified hydrochars (13.92-14.52 mg/g). The sorption ability among different feedstocks after modification was as the following: sawdust> wheat straw > corn stack. Cadmium sorption kinetics on modified hydrochars could be interpreted with a pseudo-second order, and sorption isotherm was simulated with Langmuir adsorption model. High cadmium uptake on modified hydrochars was observed over the pH range of 4.0-8.0, while for other heavy metals (Pb(2+), Cu(2+), and Zn(2+)) the range was 4.0-6.0. In a multi-metal system, the sorption capacity of heavy metals by modified hydrochars was also higher than that by unmodified ones and followed the order of Pb(II) > Cu(II) > Cd(II) > Zn(II). The results suggest that KOH-modified hydrochars can be used as a low cost, environmental-friendly, and effective adsorbent for heavy metal removal from aqueous solutions.

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Section: Xrd Analysismentioning

confidence: 99%

Characterization of potassium hydroxide (KOH) modified hydrochars from different feedstocks for enhanced removal of heavy metals from water

Sun

Tang

Gong

et al. 2015

Environ Sci Pollut Res

181

View full text Add to dashboard Cite

show abstract

“…Tetraethyl orthosilicate: (Si(OC 2 H 5 ) 4 : TEOS, >99%) was purchased from SigmaAldrich (Sintra, Portugal), sodium hydroxide (NaOH) (>98%) was purchased from VWR Prolabo (Carnaxide, Portugal), ethanol (CH 3 CH 2 OH) (>99%) obtained from Panreac (Odivelas, Portugal) and ammonia solution (25% NH 3 ) obtained from Riedel-de-Häen (Sintra, Portugal). The certified standard solution of mercury nitrate (1000 ± 2 mg/L) was purchased from Merck (Carnaxide, Portugal).…”

Section: Chemicalsmentioning

confidence: 99%

“…exchange, adsorption, membrane filtration and electrochemical technologies [1]. Among these techniques, adsorption has been one of the most effective and simplest approaches developed for removal purposes [2][3][4][5]. The efficiency of the adsorption process is mostly affected by the properties of the adsorbent, namely the type of interactions occurring between the adsorbate and the sorbent's surfaces.…”

Section: Introductionmentioning

confidence: 99%

The role of operational parameters on the uptake of mercury by dithiocarbamate functionalized particles

Tavares

Lopes

Daniel‐da‐Silva

et al. 2014

Chemical Engineering Journal

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“…It has been reported that S atoms play the major role in complexation with Cd (Bai et al 2011). According to the theory of hard and soft acid-base, the soft acid Cd has strong binding activity with the soft base dithiocarbamates (Pearson 1963).…”

Section: Potential Application Of Dtc-cts In Cd-contaminated Soil Remedymentioning

confidence: 99%

Reducing the bioavailability of cadmium in contaminated soil by dithiocarbamate chitosan as a new remediation

Yin

Cao

et al. 2015

Environ Sci Pollut Res

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Dithiocarbamate chitosan (DTC-CTS) was used as a new amendment for remediation of cadmium (Cd)-contaminated soils to reduce the Cd bioavailability. Arabidopsis thaliana was chosen as a model plant to evaluate its efficiency. It was found that DTC-CTS could effectively improve the growth of A. thaliana. The amount of Cd up-taken by A. thaliana could be decreased by as much as 50% compared with that grown in untreated Cd-contaminated soil samples. The chlorophyll content and the aerial biomass of Arabidopsis also increased substantially and eventually returned to a level comparable to plants grown in non-contaminated soils, with the addition of DTC-CTS. These findings suggested that DTC-CTS amendment could be effective in immobilizing Cd and mitigating its accumulation in plants grown in Cd-contaminated soils, with potential application as an in situ remediation of Cd-polluted soils.

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Synthesis of a novel silica-supported dithiocarbamate adsorbent and its properties for the removal of heavy metal ions

Cited by 211 publications

References 58 publications

Characterization of potassium hydroxide (KOH) modified hydrochars from different feedstocks for enhanced removal of heavy metals from water

Characterization of potassium hydroxide (KOH) modified hydrochars from different feedstocks for enhanced removal of heavy metals from water

The role of operational parameters on the uptake of mercury by dithiocarbamate functionalized particles

Reducing the bioavailability of cadmium in contaminated soil by dithiocarbamate chitosan as a new remediation

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