how do i keep object destroyed after reloding scene ??

in my game I have free roam In which the character collect hidden objects. when I collect the object the score adds up and it is saved to playerprefs but the problem is that when I reload the scene the object that I collected appears again and the player can recollect it. so I am wondering what should I add to my code to keep the collected object from re-appearing. here is my code

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 public class iconcollect : MonoBehaviour {
 
 
 public static int money; // The player's money.
 public Text moneytext;      // Reference to the Text component.
     public string icon;
 void Awake ()
 {
     // Set up the reference.
         moneytext =  GameObject.FindGameObjectWithTag("text").GetComponent<Text>();
     money=(PlayerPrefs.GetInt("Money"));
         icon = (PlayerPrefs.GetString ("icon"));
 
 }
 
 void Update ()
 {
     moneytext.text = money + "/100";
     PlayerPrefs.SetInt ("Money", money);
 
     }
     
 
     void SetCountText ()
     {
         moneytext.text = "Count: " + money.ToString ();
         if (money >= 12)
         {
             Application.LoadLevel("unlocklevel34");
         }
     }
     void OnCollisionEnter (Collision col)
     {
         if(col.gameObject.name == " icon")
         {
             col.gameObject.SetActive(false);
             money = money + 1;
 
         }
     }
 
 }