Graphene hybridized polydopamine-kaolin composite as effective adsorbent for methylene blue removal

He, Kai; Zeng, Guangming; Chen, Anwei; Huang, Zhenzhen; Peng, Min; Huang, Tiantian; Chen, Guiqiu

doi:10.1016/j.compositesb.2018.10.063

Cited by 98 publications

(34 citation statements)

References 58 publications

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“…The influence factors of CA-Al-KABs' adsorption capacity towards CIP were systematically studied through batch adsorption experiments. The factors included the dosage of CA-Al-KABs (0.0 -0.1 g/50 mL), the initial pH of the solution (3)(4)(5)(6)(7)(8)(9)(10)(11), contact time (0-1440 min), temperature (288.15 K -308.15 K), initial concentration of CIP (20-140 mg/L), and different ionic strengths. In addition, the adsorption performance of CA-Al-KABs on different antibiotics was also studied.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…In batch adsorption experiments, the optimal pH was obtained by evaluating the adsorption process at different pH (3)(4)(5)(6)(7)(8)(9)(10)(11). Further, CA-Al-KABs of different dosage (0.02, 0.04.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…The concentration of CIP was also measured after reacted for different times (0−1440 min) at different temperatures (288.15−308.15 K). The adsorption capacity of CA-Al-KABs at different times was calculated using Equation (3). Furthermore, the adsorption isotherm and thermodynamics at different temperatures were studied by controlling the initial concentration of CIP (20-140 mg/L), and the adsorption time was kept for as long as 24 h to ensure that the adsorption process reached adsorption equilibrium.…”

Section: Adsorption Experimentsmentioning

confidence: 99%

“…It is widely accepted that clays such as Kaolin have the advantages of economic cost, abundant availability, and environmental friendliness [3]. It is widely accepted that kaolin is abundant in nature.…”

Section: Introductionmentioning

confidence: 99%

“…For example, graphene hybridized polydopamine-kaolin composite was synthesized as an effective adsorbent for the removal of methylene blue, and achieved the adsorption capacity of 39.663 mg/g [3]. Ibrahim et al [8] prepared zeolites from kaolin, then they investigated its adsorption behavior towards different heavy metals, such as Cu 2+ , Cd 2+ , Cr 2+ , Ni 2+, and Zn 2+ .…”

Section: Introductionmentioning

confidence: 99%

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Removal of Ciprofloxacin with Aluminum-Pillared Kaolin Sodium Alginate Beads (CA-Al-KABs): Kinetics, Isotherms, and BBD Model

Pan

Zheng

et al. 2020

Water

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In recent years, the problem of water pollution caused by antibiotics has attracted wide attention. The common use of antibiotics represents a threat to both human health and environmental safety. The modification of kaolin clay is promising due to its high efficiency, easy operation, and low cost. In this study, a novel material, aluminum-pillared kaolin sodium alginate beads (CA-Al-KABs), was synthesized by gelling and solidification processes. The structure and chemical properties were characterized by various analytical methods. The influencing factors (such as adsorbent dosage, contacting time, pH, ion strength, temperature, and initial concentration) and adsorption mechanism of ciprofloxacin (CIP) were studied. Furthermore, adsorption kinetics, adsorption isotherms, and a Box–Behnken design (BBD) model were conducted. Moreover, CA-Al-KABs’ adsorption efficiency towards other antibiotics were also evaluated. The adsorption experiments showed that the acidic environment (pH = 4) was more favorable for the adsorption of ciprofloxacin. The adsorption kinetics of ciprofloxacin by CA-Al-KABs microspheres were confirmed to be more suitable with the pseudo-first-order kinetics model. The Langmuir isotherm model showed that the maximum adsorption capacity of CA-Al-KABs microspheres to ciprofloxacin was 68.36 mg/g at 308.15 K. The adsorption driving force of CIP near CA-Al-KABs may be the electrostatic attraction. Further, CIP could also form complexes with Ca2+ and Al—Al—OH on CA-Al-KABs, and thus CIP was attracted to the adsorbent. Adsorption thermodynamics showed that the adsorption process was exothermic, feasible, and spontaneous. In addition, the adsorption performance on other antibiotics indicated CA-Al-KABs’ broad application in the treatment of antibiotic wastewater.

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