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Abstract: Adsorption of a weak acid dye, methyl orange (MO) by calcined layered double hydroxides (LDO) with Zn/Al molar ratio of 3:1 was investigated. In the light of so called “memory effect,” LDO was found to recover their original layered structure in the presence of appropriate anions, after adsorption part of MO− and CO2− 3 (come from air) intercalated into the interlayer of LDH which had been supported by XRD and ICP. The results of adsorption experiments indicate that the maximum capacity of MO at equilibrium () and percentage of adsorption (η%) with a fixed adsorbent dose of 0.5 g L−1 were found to be 181.9 mg g−1 and 90.95%, respectively, when MO concentration, temperature, pH and equilibrium time were 100 mg L−1, 298 K, 6.0 and 120 min, respectively. The isotherms showed that the adsorption of MO by Zn/Al-LDO was both consistent with Langmuir and Freundlich equations. The adsorption process was spontaneous and endothermic in nature and followed pseudo-second-order kinetic model. The calculated value of was found to be 77.1 kJ mol−1, which suggests that the process of adsorption of methyl orange is controlled by the rate of reaction rather than diffusion. The possible mechanism for MO adsorption has also been presumed. In addition, the competitive anions on adsorption and the regeneration of Zn/Al-LDO have also been investigated. [Copyright &y& Elsevier]

Highlights: [•] Different Ti-based LDH materials with good crystal structure have been synthesized. [•] The band gap of LDH materials follow the order: Zn/Ti>CeO2/ZnTi>Zn/Al–Ti/SB. [ • ] The degradation performance of MO/MB follow the order: CeO2/ZnTi>Zn/Al–Ti/SB>Zn/Ti. [•] Mechanism and intermediates for photocatalytic degradation on MO has been presumed. [•] Zn/Al–Ti/SB–LDHs after MO/MB degradation was feasible at least three cycles. [Copyright &y& Elsevier]

Highlights: [•] Zn/M–NO3-LDHs (Al, Fe, Ti, and Fe/Ti) have been synthesized. [•] The band gap of LDH materials followed the order: Zn/Fe>Zn/Fe/Ti>Zn/Ti>Zn/Al. [•] The photocatalytic performance by four materials: Zn/Ti>Zn/Al>Zn/Fe/Ti>Zn/Fe. [•] The mechanism for photocatalytic degradation on Rhodamine B has also been presumed. [•] Zn/Ti–NO3-LDHs after RB degradation were feasible at least three cycles. [Copyright &y& Elsevier]