Removal characteristics of Cd(II) from acidic aqueous solution by modified steel-making slag

Duan, Jinming; Su, Bing‐Jian

doi:10.1016/j.cej.2014.02.056

Cited by 128 publications

(43 citation statements)

References 42 publications

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“…The reported adsorption capacities of some other adsorbents for Cd(II) are presented in Table 3 for comparison. Mg-Al-CO 3 -and magnetic [4,[6][7][35][36][37]. Furthermore, the magnetic Fe 3 O 4 /Mg-Al-CO 3 -LDH can be easily separated from the mixture of adsorbent and adsorbate via an external magnetic field; the separation was achieved in 10 s after the adsorption process (Fig.…”

Section: Tablementioning

confidence: 98%

Adsorption of Cd(II) by Mg–Al–CO3- and magnetic Fe3O4/Mg–Al–CO3-layered double hydroxides: Kinetic, isothermal, thermodynamic and mechanistic studies

Shan

Yan

Yang

et al. 2015

Journal of Hazardous Materials

265

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Section: Tablementioning

confidence: 98%

Adsorption of Cd(II) by Mg–Al–CO3- and magnetic Fe3O4/Mg–Al–CO3-layered double hydroxides: Kinetic, isothermal, thermodynamic and mechanistic studies

Shan

Yan

Yang

et al. 2015

Journal of Hazardous Materials

265

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“…When the pH of the solution was less than 7.8, the surface of the MSS was positively charged (Figure 5), which was mainly the result of protonation [20,27] or dissolved metal cations embedded on its surface, see Equation (4) [26,39]. This process favours the adsorption of the electrostatic attraction between the adsorbent and the nitrate, see (Equation (12), Figure 11III).…”

Section: Removal Mechanismmentioning

confidence: 99%

“…After measuring the zeta potential of the MSS particles, it was found that the surface charge of the modified steel slag decreased from +18.19 to −5.45 when the pH of the solution was between zero and 10, where the pHzpc (isoelectric point) was 7.8. The pH of the solution determined the protonated variable charge of the surface of the MSS [20,27], which affected the electrical properties of the adsorbent and thus had a great influence on the adsorption of nitrate. In the acidic medium, the hydration surface of the MSS underwent a protonation reaction, see Equation (4), and the dissolved metal cation was embedded in the surface of the MSS to obtain a positive charge [26,39].…”

Section: Effect Of Phmentioning

confidence: 99%

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Yang

et al. 2017

Water

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Steel slag, which makes up a gigantic amount of metallurgical industrial solid waste, was in this experiment successfully synthesized an inexpensive adsorbent used to remove nitrate pollution from aqueous solution. This adsorbent was obtained by mixing steel slag, aluminium hydroxide and deionized water, and aging this at a mass ratio of 3:0.45:2, and then activating it at 800 • C. The physicochemical characteristics of the steel slag before and after modification were investigated to compare the effect of their surface properties on the adsorption behaviour of nitrate. The effects of adsorbent dosage, pH, and contact time on the adsorption process were investigated. The results showed that an increase in specific surface area and the formation of a positive surface of the modified steel slag (MSS) compared with the original steel slag (OSS) could effectively increase the number of the active adsorption sites and nitrate removal ability. The optimum parameters for nitrate removal were as follows: the concentration of nitrate was 20 mg/L, the dosage was 1 g/100 mL, the pH was four, and the reaction time was 180 min. The adsorption capacity of the MSS was approximately 1.9 times that of the OSS. The nitrate adsorption of the MSS was in accordance with the pseudo-second-order model and the Freundlich model, which indicated that the adsorption of nitrate on the MSS was mainly single layer chemical adsorption. The mechanism of nitrate removal mainly included ion exchange, hydrogen bonding, electrostatic interactions and intermolecular interactions. In addition, regeneration experiments indicated that the MSS after regeneration still had the capacity to remove nitrate.

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“…Barca et al (2012) found that steel slag could remove phosphate from synthetic and real wastewater by using the released Ca 2+ and OH − ions that reacted with phosphates. Duan and Su (2014) reported that a modified steel slag could be used as an adsorbent for eliminating Cd(II) in acidic aqueous solutions. To our knowledge, steel slag has rarely been reported as a flocculant.…”

Section: Introductionmentioning

confidence: 99%

Flocculation of Microcystis aeruginosa by steel slag and its safety evaluation

Cao

Zhang

et al. 2015

J Appl Phycol

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This study investigated the flocculation of Microcystis aeruginosa by steel slag and evaluated the safety of treated water. The results showed that algal cells at a steel slag dosage of 0.48 g L −1 were effectively removed from two diluted algal solutions when their algogenic organic matter (AOM) contents were 3.54 and 5.81 mg L −1 (referred to as S1 and S2) with algae removal rates of 93.8 and 92.6 %, respectively. Simultaneously, the concentrations of AOM were reduced in S1 and S2 with removal efficiencies of 72.6 and 70.2 %, respectively. Charge neutralisation and bridging were probably the mechanisms that accelerated the flocculation processes. However, AOM had a priority over the algae in the reaction with the steel slag by producing protein complexation, which adversely affected coagulation and increased coagulant demand. Increased K + and AOM after flocculation indicated that cell damage occurred at a retention time of 36 h. However, acute toxicity test demonstrated that the inhibition rate did not significantly increase until the retention time reached 48 h. Overall, steel slag has a great potential as a low-cost alternative to control algal bloom and restore aquatic ecosystems.

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Removal characteristics of Cd(II) from acidic aqueous solution by modified steel-making slag

Cited by 128 publications

References 42 publications

Adsorption of Cd(II) by Mg–Al–CO3- and magnetic Fe3O4/Mg–Al–CO3-layered double hydroxides: Kinetic, isothermal, thermodynamic and mechanistic studies

Adsorption of Cd(II) by Mg–Al–CO3- and magnetic Fe3O4/Mg–Al–CO3-layered double hydroxides: Kinetic, isothermal, thermodynamic and mechanistic studies

Characteristics of Nitrate Removal from Aqueous Solution by Modified Steel Slag

Flocculation of Microcystis aeruginosa by steel slag and its safety evaluation

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