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Synthesis of p -hydroxybenzoic acid (PHBA)-intercalated Mg/Al-LDH and PHBA-immobilized Mg/Al-LDH have been conducted. PHBA-intercalated Mg/Al-LDH hybrid was synthesized by co-assembly process of Mg/Al-LDH nanosheets and PHBA anions. PHBA-immobilized Mg/Al-LDH was prepared by indirect synthesis, where PHBA anions were attached on surface of the Mg/Al-LDH material. Characterization by X-ray Diffraction showed that the PHBA-intercalated Mg/Al-LDH hybrid has the lattice parameter of a=3.02 A, lattice parameter of c=46.77 A and basal spacing d 003 =15.14 A, where PHBA has been intercalated in interlayer of the hybrid. The PHBA-immobilized Mg/Al-LDH has lattice parameter of a=3.06 A, lattice parameter of c=23.70 A and basal spacing d 003 =7.90 A. The analytical result confirmed that PHBA has been attached on surface of the hybrid for PHBA-immobilized Mg/Al-LDH. The optimum 10 mL of [AuCl 4 ]‾ 100 mg L-1 removal condition of both hybrids were reached at pH 3. The optimum interaction time of [AuCl 4 ]‾ and PHBA-intercalated Mg/Al-LDH hybrid was 250 minutes, respectively, while that for [AuCl 4 ]‾ and PHBA-immobilized Mg/Al-LDH was 150 minutes. Removal of [AuCl 4 ]‾ by PHBA-intercalated Mg/Al-LDH hybrid followed pseudo second order kinetic, whereas by PHBA-immobilized Mg/Al-LDH followed pseudo first order kinetic. Characterization using stereo photomicroscope confirmed that [AuCl 4 ]‾ could be reduced  to Au  metal by both hybrids.

Comparison Study of PHBA-intercalated Mg/Al-LDH and PHBA-immobilized Mg/Al-LDH: Characterization and Application for [AuCl4]̄ Removal from Solution