Removal of cadmium from wastewater by magnetic zeolite synthesized from natural, low-grade molybdenum

Peng, Zhen-dong; Lin, Xueming; Zhang, Yulong; Hu, Zheng; Yang, Xingjian; Chen, Cheng-yu; Chen, Hua-yi; Li, Yongtao; Wang, Jinjin

doi:10.1016/j.scitotenv.2021.145355

Cited by 66 publications

(14 citation statements)

References 42 publications

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“…Such affinity leads to the stable coordination complexation of metallic compounds to release the protons (H + ) or cations (e.g., Na + , K + ) into the solutions (Wong et al 2014). The latter mechanism relies on the formation of electrostatic attraction between positively charged metal cations and negatively charged surface of the biosorbent (Saleh and Ali 2018;Verma et al 2020;Peng et al 2021). This may enhance the immobilization and sequestration of heavy metal ions in the structure of the biosorbent.…”

Section: Plausible Adsorption Mechanism Of Heavy Metal Ionsmentioning

confidence: 99%

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Invasive plants as biosorbents for environmental remediation: a review

et al. 2022

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Water contamination is an environmental burden for the next generations, calling for advanced methods such as adsorption to remove pollutants. For instance, unwanted biowaste and invasive plants can be converted into biosorbents for environmental remediation. This would partly solve the negative effects of invasive plants, estimated at 120 billion dollars in the USA.Here we review the distribution, impact, and use of invasive plants for water treatment, with emphasis on the preparation of biosorbents and removal of pollutants such as cadmium, lead, copper, zinc, nickel, mercury, chromate, synthetic dyes, and fossil fuels. Those biosorbents can remove 90-99% heavy metals from aqueous solutions. High adsorption capacities of 476.190 mg/g for synthetic dyes and 211 g/g for diesel oils have been observed. We also discuss the regeneration of these biosorbents.

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Section: Plausible Adsorption Mechanism Of Heavy Metal Ionsmentioning

confidence: 99%

“…Cadmium (Cd) presents as one of the most toxic non-biodegradable heavy metals in the aqueous media and soils (Peng et al 2021). Cadmium is often detected in many kinds of industrial effluents, pigment production, and metal refining activities (Zhang et al 2021).…”

Section: Cadmiummentioning

confidence: 99%

Invasive plants as biosorbents for environmental remediation: a review

et al. 2022

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“…The kinetics of adsorption is used to predict the adsorption rate, which gives important information for designing and modeling the processes [30]. In this paper, two commonly used models were applied to determine the diffusion mechanism for Cd adsorption from aqueous solutions: the pseudo-first-order and pseudo-second-order models.…”

Section: Isotherm and Kinetics Adsorption Experimentsmentioning

confidence: 99%

Study on Adsorption Characteristics of Heavy Metal Cd<sup>2+</sup> by Biochar Obtained from <i>Water Hyacinth</i>

Wang¹,

Guo²,

Li³

et al. 2022

Pol. J. Environ. Stud.

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In this paper, the biochar prepared by pyrolysis biomass of Water Hyacinth were used as adsorption materials. The effects of initial concentration, adsorption temperature and electrolyte concentration on the adsorption process were analyzed. The adsorption effect of biochar prepared from the stem and root parts of biomass on Cd 2+ in solution was investigated, and the interaction between leaching rule of alkali (earth) metal K + , Mg 2+ , Ca 2+ and adsorption of heavy metal ions in the process of adsorption was studied. The results showed that the biochar prepared by pyrolysis of stem biomass (SBC) has a richer pore structure. Compared with the biochar prepared by root biomass (RBC), the specific surface area and pore volume of SBC increased by 25.85% and 27.91% respectively. This phenomenon indicated that SBC had a stronger adsorption effect than RBC. At 25ºC, the maximum adsorption capacity of RBC and SBC for Cd 2+ was 77.20 mg g -1 and 87.20 mg g -1 , respectively. Isothermal adsorption experiments and ionic strength experiments showed that the increase of temperature could promote the adsorption of Cd 2+ by biochar. The adsorption process has a high degree of fitting with the Langmiur model, as well as the pseudo-second-order model. The adsorption sites were normally on the inner and outer surfaces of biochar, and the adsorption process was multi-molecular layer adsorption. In addition, the adsorption of Cd 2+ by biochar had a correlation with the leaching of alkali (earth) metal in the system. In the adsorption process, the leaching of alkali (earth) metals was affected by the initial concentration of Cd 2+ in the solution, and SBC leached more alkali (earth) metals than RBC, which proved that SBC has more

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“…In order to further clarify the adsorption characteristics of heavy metals, the static adsorption kinetic curves were fitted by pseudo first-order and pseudo second-order kinetic models, which are shown in Equations ( 8) and (9). The relevant parameters are shown in Table 3, and the fitting results are shown in Figure 6.…”

Section: Dynamic Adsorption Modelmentioning

confidence: 99%

“…Cadmium can only undergo morphological changes and migration, and does not to become harmless by self-decomposition. Therefore, various conventional technologies revolve around the removal of Cd(II) or changes designed to reduce its activity, such as chemical precipitation [8], ion exchange [9] and chelation [10]; furthermore, Cd(II) is sometimes gathered and removed from the medium by using methods such as phytoremediation [11] or microbial remediation [12,13]. However, some of these methods are expensive or have a risk of secondary contaminations.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Cattail-Derived Biochar and Its Application for Cadmium Removal

Wang

Yan²,

Song

et al. 2021

Sustainability

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Biochars produced from aquatic plants have attracted increasing attention for the removal of heavy metals from the environment. Therefore, biochars derived from the roots (CBR), stems (CBS) and leaves (CBL) of cattail were investigated in this paper for their higher adsorption capacity, particularly for Cd(II). The adsorption characteristics and the leaching of alkali (soil) metals within biochars obtained from the different tissues of cattail were also discussed. The results showed that the specific surface area of cattail root biochar reached 15.758 m2 g−1. Langmuir, Freundlich and D-R isotherm equations were used to fit the experimental data, and the last equation revealed the best fitting result. The adsorption kinetics for Cd(II) removal were determined by using two different models. The experimental data for CBR and CBS were in good agreement with the pseudo second-order model, whereas the pseudo first-order model provided a better fit for CBL. The amount of leached K reached 73.214 mg g−1 in CBS (55.087 mg g−1 in CBL), which was almost an order of magnitude higher than those of Mg and Ca. The experimental data showed that the leached Mg and Ca metals in CBL had maximum levels of 6.543 and 10.339 mg g−1, respectively. The mechanism of Cd(II) sorption by the biochar is complex and probably involves a combination of mass transfer, ion exchange, and mineral precipitation through the macropores and micropores of the biochar in the sorption process.

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Removal of cadmium from wastewater by magnetic zeolite synthesized from natural, low-grade molybdenum

Cited by 66 publications

References 42 publications

Invasive plants as biosorbents for environmental remediation: a review

Invasive plants as biosorbents for environmental remediation: a review

Study on Adsorption Characteristics of Heavy Metal Cd<sup>2+</sup> by Biochar Obtained from <i>Water Hyacinth</i>

Preparation and Characterization of Cattail-Derived Biochar and Its Application for Cadmium Removal

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